Timing Cover Gasket Coolant Leak

hell of a job. Unfortunately I have no choice but to pull the timing cover as I have an internal coolant leak and I'm pretty sure it's there based on what I've read on here. An external leak can be identified as oil and coolant accumulating underneath the engine. Clean the timing chain cover. 95 mustang v6 leaking coolant behind the new water pump. heres a link its number 6 and 7. It's now leaking again in the same place. I was relieved to finally find the real culprut to the leak. But over time and heat would most likely crack. Only 2% of customers require a second treatment to achieve a “Full-Seal”. Honda is offering a new engine block or completely new engine, free, to owners of 2006 through 2008 and some early. its a timing cover leak for sure. i forgot to mention that i have a '95 3. 7 and leaks are not common at all. Does anyone have any experiences with some of the less expensive ones?. I knew this day was going to come eventually, so here I am. 50mm) past the lower edge of the cover. Install the lower timing belt cover. Took it to Firestone and they say the water pump is fine and the leak is coming from the timing cover. Based on your info then it makes no sense that coolant could leak inside the timing cover and then drip out the bottom. I have replaced the intake manifold and head gaskets, the muffler, the rear bushings and the EGR valve. I popped off the skid pan and AGAIN THERE WAS A LEAK!. Its advertised as an 88 (87 actually i think) with a 6. The timing cover gasket provides an air-tight seal between the timing cover and engine block. :-(Anyway, I told you that to tell you. I have been told it is a slow leak from the intake gasket. The timing cover is constructed of plastic or metal and works in conjunction with the timing cover gasket to keep oil from leaking onto the ground. First of all, it must be clear that you have a blown head gasket. This repair is difficult, owing to the location of the water pump on the front of the engine, under the timing belt cover. The weep hole is obviously on the bottom of the pump so you won't be able to see it when you remove the upper cover but you might be able to see the leakage below it. I saw posts suggesting to check the water pump. :) Have to start collecting parts. As for whether the price is fair, ring around and get a few quotes. the most common is failing between two cylinders. The presence of coolant can be detected by shining a black light on what appears to be an oil leak; the appearance of coolant will show up under the black light. when the car was having the coolant leak last summer i didnt drive it very much, and as soon as the ford dealer fixed it i did an oil and filter change. Thought it was my water pump before I dug into it. i have also noticed that for the last couple of months the coolant overfolw needs to be filled up about every 3 weeks. The gasket on one or both are leaking. You'll want to know what leaks to plan out the repair. Turns out its leaking between the timing cover and block. there is no gasket. The pump or the pump gasket will leak. When a Timing Chin Gasket fails oil will start to appear outside of the Timing Chain Cover. Any input is appreciated. The cover don't need replacing, the gasket does. Very very common. May have been on our forum too. Yes, you guessed it, timing chain gasket leak. I have a 86 Mercruiser 170 that is in decent shape. Its the timing chaing gasket thats the truly bad one. Symptoms of Wear or Failure. WHAT A KING SIZE PAIN IN THE @#$%&. So my question is, was it a bad idea to swap the covers?. I've also developed a coolant leak as well, which is either from the cover or the water pump. :) Have to start collecting parts. replaced valve cover gasket. Heat can also cause rubber (neoprene) gaskets and seals to harden and lose elasticity. Quoted $850 (w/water pump installation), $750 for leak repair. You may be able to find a bit cheaper place on the labor, but you're still probably talking around the $1500~2000 range with an independent shop (you didn't say whether or not the cover itself is being quoted in the price, I assume it isn't since I think the dealership wants something like $800 for just the cover portion. Order Ford Mustang Timing Cover Gasket online today. Needed new gasket big job took it to local shop had them put a oil pan gasket on it since they have to remove so much to change the timing cover gasket. One of the most common problems on the GM 3. So if you have coolant in with the chain, it's in the oil. My 2002 Ford Ranger continues to have issues. Over time the gasket becomes brittle and will crack due to exposure to dirt, debris, heat and other elements. 3 V6 (2000) e. Change the oil. What is a powertrain and what does a powertrain warranty cover? The powertrain includes the engine, the transmission, and drivetrain, and a powertrain warranty covers the cost to repair or replace these components should they malfunction or be damaged. This happened as shown below: Press the gasket back into the groove and do it this time for real. The coolant passes the waterpump and is pump into the engine block thru the timing cover. The signs of a blown head gasket can be subtle. I decided to bite the bullet and have a shop fix it, I'm 68 and still change the oil and brakes, etc, but didn't want to tackle this. I religiously check my oil for signs of coolant, and haven't seen anything to be concerned about. Also throw some liquid gasket on there too, I like mopars gasket maker. I don't think it's the water pump gasket because I see what I think is coolant on the side of the block. Especially when you are trying to save money. REG LEAK, Honda Genuine Parts and accessories online at AutoKartz in India. again thanks for reply. The timing case cover gasket 3681P046 is the working seal between the timing cover and the engine block, preventing contaminants out of the gear shaft area and ensuring an effective fluid seal, where symptoms of wear or failure include an oil or coolant leak. The timing cover gasket provides an air-tight seal between the timing cover and engine block. So when dealing with the top of the engine there are several places that you can and probably will get a coolant leak overtime. It is right next to the crankshaft pulley. I've finally tracked down a coolant leak and now Im looking for a little advice on anything else I should replace or look at while I'm changing my timing cover gasket and water pump gasket. It is Sunday and I'm just asking the Volvo crowd. 98% of customers achieve a “Full-Seal” on the first application. Have no idea what total would be then. I would just replace all the necessary gaskets to fix that. I am an ASE Master Technician and have 25 years of experience. Engine oil leaks occur most often at the valve cover and oil pan gaskets, timing chain cover and the front and rear crankshaft seals. Coolant is leaking into back area of engine timing cover and out of hole. Remember that oil leaks can damage the timing cover gasket, in which case the gasket can no longer protect the timing belt. 0 with no compression and it is all pointing towards the head gasket. Fixing a Valvecover Gasket Leak: If you have a leaking gasket it can cost you a lot if you don't fix it. Unlike the timing cover on a small block Chevy, which merely covers the timing set (as the name implies), the AMC V8 timing cover does much more. I saw posts suggesting to check the water pump. I have a v8 96 disco that has started leaking coolant from the timing cover, right hand side just below the dizzy were it bolts to the block, doesn't seem to leak when the engines hot but when left over night coolant leaks down were the timing cover housing bolts onto the block and drips off the bottom of the sump, about 10 drops over night. Did not discuss water pump replacement. The timing case cover gasket 3681P047 is the working seal between the timing cover and the engine block, ensuring an effective fluid seal, and preventing contaminants out of the gear shaft area, where symptoms of wear or failure include a coolant or oil leak. :-(Anyway, I told you that to tell you. OK, enough of that! I looked at the cover and there is visible corrosion where the coolant reacted with the cover's metal. it seems to be coming from the cylnder head on the front left of the engine. I've got my timing cover off to fix a coolant leak from the top of the passenger side. Hope this helps. Hey dudes, just noticed i've got a leak coming from behind the timing cover. If so, I recommend you try adding an 8 oz bottle of K-Seal directly to the radiator and idle the engine for about 15-20 mins. Just had my 2010 in for an oil/coolant change. there is no sign of oil on the side of the engine, just the front. Thought it was my water pump before I dug into it. In this video I show how to remove the front cover on the 3. I bought the Dorman timing cover for that repair, just in case the old cover was corroded after 20 years, which it wasn't. It is right next to the crankshaft pulley. So what the heck, removed the harmonic balancer and took the Timing Chain Cover off. If you inspect the 4 outside corners of the intake you may find coolant leaking. 0L 12v Timing Cover Coolant Leak Repair. I have a 96 Windstar 3. This sludge is caused by coolant that has condensed on the valve covers and other parts of the engine. The upper timing cover gasket is one of the most common places to have an oil leak on your BMW E53. TEST 1: Oil The Color Of ‘Coffee With Too Much Cream’ The first to two tests are the easiest and will take you less than 5 minutes to do. As an engine ages, heat can cause cork gaskets to harden and shrink. Does anyone have any idea why I would be leaking coolant after I had my timing belt and water pump replaced? I see coolant dripping down to the ground with the engine running and the heater on hot. Picutes of some common areas of coolant leaks on the GM 3. The bad news. it seems to be coming from the cylnder head on the front left of the engine. Mine dribbled out from the other side (firewall side). I will get a gasket and try again, is there coolant passage in timing cover? Guess it could be headgasket as well. " It was kind of strange because I service sales guy started by saying "you probably know about this. 5 inches high that resides between the cylinder head and timing case is defective. I thought all along it was the valve cover gasket and after replacing it twice, no dice. A faulty or damaged head gasket will leak coolant, so the coolant level indicator will be very low. :) Have to start collecting parts. I plan on purchasing both a timing chain gasket and water pump gasket and replacing. Oil or coolant leak; Related Repair Advice. Some of the symptoms of a blown head gasket are: Coolant leak; Loss of coolant with no visible leaks; Engine is. My 05 Malibu bad a intake gasket leak with only 6000 km. 2L and the other a 2003 Chrysler Concorde with a 3. 15 days return. As it has been explained to me, it is coming from the side of the engine that has aluminum housing, where the timing chain goes. In this case, you can’t blame the leak on the gasket. Over time the gasket becomes brittle and will crack due to exposure to dirt, debris, heat and other elements. In this video I show how to remove the front cover on the 3. Leaking coolant from what looks like the timing cover. At the same time, check for oil leaks around the timing cover and oil pan. If not replaced in time, a bad valve cover gasket can lead to complete engine failure. It can be hard to pinpoint the source, but if it is coming up from high on the engine, the pump is the likely source. I bought the Dorman timing cover for that repair, just in case the old cover was corroded after 20 years, which it wasn't. Head replaced and then this leak appeared after 3 months. How / Why is this? Well, for starters, this is on the rear side of the engine as determined by the rotating assembly (crank, alternator, etc. Hi, everyone, I have a coolant leak from the timing cover on my 2003 Mercury Sable. I was thinkling it would be cheap and easy to replace the water pump and gasket while I had it out. 0 with no compression and it is all pointing towards the head gasket. Psychopete. If so, I recommend you try adding an 8 oz bottle of K-Seal directly to the radiator and idle the engine for about 15-20 mins. Timing covers do leak coolant. Try renewing the water pump and make sure you use thread sealant or at least goo on the long bolts that go into the block. I am going to go ahead and replace it and see what's what. Prolonged engine operation will result in the chain wearing through the timing cover allowing coolant to leak into the engine crankcase. Maybe because there are so many posts. Your leak is probably at the lower intake manifold gasket. 4L V8 three-valve engines can cause a number of running problems. I've dealt with it as much as possible, but now it is leaking quite badly. How / Why is this? Well, for starters, this is on the rear side of the engine as determined by the rotating assembly (crank, alternator, etc. " It was kind of strange because I service sales guy started by saying "you probably know about this. Yes the timing cover gasket can leak coolant. Similar to the N54, a leaking valve cover, valve cover gasket, or PCV valve are among the most common problems with the BMW N55 engine. do with the front timing cover gasket. GM 3800 Coolant leak Belt Tensioner Elbows Water Pump and. CARspec cleans the entire block’s sealing surface and timing cover of all old FIPG and oil residue, taking special care to reapply extra FIPG where the leak may try to redevelop. A head gasket leaking coolant into a cylinder can foul the spark plug, and create a lot of white smoke in the exhaust. Before getting the work done make sure you find out where the leak is coming from. Although the timing cover is not a moving part, from time to time damage may be done to the cover or the gasket inside that will require service or replacement by an ASE certified mechanic. The repair on my 1998 Ford Taurus 12 valve engine started out as a timing cover coolant leak. One of the weakest points in the design of the AMC V8 is the aluminum timing cover. Timing cover leaking to the block is almost unheard of. 0 103kW BKD getting hydrolocked with coolant. 8 Cylinder Engine $7. Should I just try to replace that gasket and the water pump one at the same time? Is this a common. Is it possible that the timing cover gasket is the problem? is there any coolant in that area? or is it just leaking at the pump gasket?. The bypass passage between the timing cover and intake is a very common leak for Pontiac V-8s. 15 days return. I was hoping to ID the source so that I could have parts ready and do it in one go, but its looking more and more like a set of gaskets, bypass hose and waterpump. Most times you can drain some coolant, loosen the bolt that tightens the timing cover to the intake and the intake bolts, install a new donut and run a good bead of silicone around the hole, retighten everything, and the seal will hold. You could have a head gasket leak, but rule out an external leaks first. So what the heck, removed the harmonic balancer and took the Timing Chain Cover off. The engine oil pan gasket can develop a leak on the Ford 5. i noticed that my engine seems to be leaking oil today. Had the intake gaskets replaced (chronic problem I learned). My engine is leaking coolant from behind the timing cover. The weep hole is obviously on the bottom of the pump so you won't be able to see it when you remove the upper cover but you might be able to see the leakage below it. Fill the radiator with coolant -- see the owner's manual for the ratio of coolant to water. BMW has a costly- and not uncommon- problem with the Coolant Transfer Pipe in the middle of the Engine on its late model V8 Engines. Sometimes the Timing Cover Gasket can be replaced without needing to remove the Main Pulley. 9, and it is leaking from what appears to be the timing cover gasket just behind the water pump. Though a timing cover gasket leak can be hard to diagnose in your vehicle, avoiding them is the key to your timing belt or chain continuing to function at its best. It can be hard to pinpoint the source, but if it is coming up from high on the engine, the pump is the likely source. This can result in oil leaking. How complicated is the gasket job for this and how much would a new timing cover cost? Also, aside fro a JY where could one be sourced?. Like you said the cover is just a cover, you'll have to remove it to really see where that leak comes from. well its obviously the back cover on the pump leaking and not coming out of your timing cover. The second time (the "re-do") was at 190,000 miles with a water leak to the outside at the water port at the front of the engine. Looks like the metal line at the front of the motor just above the water pump either has been or is leaking. Only leaks when engine is hot and stop when cooled down water pump good and hold pressure and I bleed it as best I can when I add coolant when it runs hot maybe water pump seal got to hot at on. There seems to be many different brands and prices out there from really cheap kits to 'are these things gold plated?' prices. On some overhead cam engines, the water pump is behind the timing cover and is driven by the timing belt, making inspection difficult. It's now leaking again in the same place. The 2007 GMC Acadia has 4 problems reported for timing chain cover leaking. 8 engine due to the coolant passage leaking at the front of the engine (side closed to radiator). well its obviously the back cover on the pump leaking and not coming out of your timing cover. If not replaced in time, a bad valve cover gasket can lead to complete engine failure. As it has been explained to me, it is coming from the side of the engine that has aluminum housing, where the timing chain goes. It's now leaking again in the same place. 5L SOHC head gasket leaks. the work on the pump brought forth a pending gasket failure, behind the timing cover, a bit early. But NO! I was too cheap. I bought the Dorman timing cover for that repair, just in case the old cover was corroded after 20 years, which it wasn't. With the pump leaking, it's understandable someone could miss the "other" leak. The timing cover gasket is the working seal between the timing cover and the engine block. Then you have to deal with the timing cover to oil pan gasket and getting that resealed while not dropping any debris into the oil pan. It looks like it is coming from above the water pump, but it's hard to tell. If the plastic under the sealing bead on the intake manifold gasket is eaten away, the gasket can’t hold a seal and will leak. 2014 Focus timing belt cover leaking Currently on a 5,000 mile road trip and brought my hatchback SE with 40k miles into a Ford dealer for a oil change. A plastic spatula (credit card) is helpful for prying up the cylinder head cover/gasket. I have tried permatex high temp gasket maker, without success. So, I have a slight coolant leak at the bolt that is furthest towards the driver's side of the timing cover. Coolant can leak from the reservoir or from the hoses, in 2005 Equinoxs with the 3. It was a severe failure, not "weeping" or a slow leak. The timing case cover gasket 3681P047 is the working seal between the timing cover and the engine block, ensuring an effective fluid seal, and preventing contaminants out of the gear shaft area, where symptoms of wear or failure include a coolant or oil leak. The head gasket prevents oil from entering the cylinders, between power strokes, and the coolant. I plan on purchasing both a timing chain gasket and water pump gasket and replacing. It is right next to the crankshaft pulley. 2014 Focus timing belt cover leaking Currently on a 5,000 mile road trip and brought my hatchback SE with 40k miles into a Ford dealer for a oil change. Clean the timing chain cover. I did replace the pump about 2-3 years and there are no sign of it failing whatsoever. My 2002 Ford Ranger continues to have issues. When a Head Gasket Fails. All good info. The signs of a blown head gasket can be subtle. Next weekend I am actually going to rip off the air plenum to change the valve cover gaskets(oil leak). With the coolant passages going through the timing cover, and using that gasket I was scared to start mine up once it was leaking. 460 leaking behing water pump coolant was leaking from behind the timing case. the signs of a valve cover leak are oil on the engine oil is the only thing that can leak from a leaky valve cover Read More Asked in Antifreeze and Engine Coolant , Chevy S-10 , Chevy Blazer S-10. First of all, it must be clear that you have a blown head gasket. Just how serious is a coolant leak anyway? SHould I look forward to more seious engine problems?. This keeps the timing chain or belt free from road debris and keeps oil from leaking. 460 leaking behing water pump coolant was leaking from behind the timing case. the work on the pump brought forth a pending gasket failure, behind the timing cover, a bit early. This can be a very costly repair, with this video I am sure anyone with any mechanical experience can handle this job with ease. Prolonged engine operation will result in the chain wearing through the timing cover allowing coolant to leak into the engine crankcase. Will be trailering it down to a buddy with a lift and bigger tool selection. hell of a job. This is a molded gasket and is commonly referred to as the "profile gasket" (although all of the molded "rubber" gaskets used by BMW are actually called profile gaskets). I'm thinking that a fiber washer on the bolt might work. It is crucial to inspect the timing chain and all other related hardware of the engine after cam phaser failure on the 5. Similar to the N54, a leaking valve cover, valve cover gasket, or PCV valve are among the most common problems with the BMW N55 engine. I'm thinking head gasket. The parts store recommended Permatex blue RTV, which I've done both times and each time I get small coolant leaks. take a look to see if your truck is leaking! only takes a second. The valve cover gaskets are probably just the symptom of the leak and not the source. I've finally tracked down a coolant leak and now Im looking for a little advice on anything else I should replace or look at while I'm changing my timing cover gasket and water pump gasket. Or, "you can just watch it. If everything goes right this week I will be starting this on Friday. The timing case cover gasket 3681P047 is the working seal between the timing cover and the engine block, ensuring an effective fluid seal, and preventing contaminants out of the gear shaft area, where symptoms of wear or failure include a coolant or oil leak. I know some people install the head before putting the timing cover on (there’s a trick with this that involves putting the timing cover in your freezer to shrink it slightly), but I couldn’t make that work, and ruined a head gasket. 9, and it is leaking from what appears to be the timing cover gasket just behind the water pump. hell of a job. Corolla and Matrix Timing Chain Tensioner Oil Leak - 1ZZ-FE/2ZZ-GE If you own a Toyota Corolla or Matrix with the 1ZZ-FE or 2ZZ-GE you may be familiar with an oil leak from the timing chain tensioner out the back of the engine. One of the most complicated cooling system repairs on the N62 8-cylinder engine made easier by aftermarket parts manufacturers. I've got my timing cover off to fix a coolant leak from the top of the passenger side. Once you do this, pull the timing cover away and make sure the rubber gasket didn't get pushed out of place. The 2007 GMC Acadia has 4 problems reported for timing chain cover leaking. When the Audi A4 camshaft seals are leaking you'll find oil down the front side of the engine. All my newer vehicles have no radiator drain plug. Going to take on timing cover coolant leak, have questions. Re: Coolant leaking John Deere 4320 4520 4720 compact tractor I had a new 2007 4320 open station and it started to leak coolant soon after I got it. Just had my 2010 in for an oil/coolant change. So, this gurgling is air in the cooling system, but the issue is probably how did the air get there or where is the coolant leaking. I'd take another look at the leak, the TCC gasket goes out eventually in V8 ZJ's. 5 inches high that resides between the cylinder head and timing case is defective. The timing cover is on the front of the engine which is on the front of the engine. 0) developed a severe coolant leak from a failed timing cover gasket (quite common on the 3. Now the new engine runs great, but there is coolant leaking from the side (left side if you're facing the motor) of the timing cover. Coolant Leak, Help Needed Please. No play in the shaft at all. Where does my Subaru Leak oil? Most likely you know about the 2. NAIOA - Forums - Coolant Leak - Timing chain cover help - page 3 - The beginning of last summer I was leaking coolant which a shop told me was the head gasket so I replaced them and it seemed to stop for a while. Gm added the dye to the oil and they found the. I am at about 110,000. I heard good things about K-Seal and sure enough, it did the job. 0 Vulcan which I took off the road las year because of a water leak. It will require removal of the crank pulley (harmonic balancer) to get the timing cover off, but the rest should be cake. one cylinder can also blow towards the outside of the block, but that's rare at best. An external leak can be identified as oil and coolant accumulating underneath the engine. When the upper timing cover gasket leaks, it can create quite a mess and seem much worse than it is. You'll want to know what leaks to plan out the repair. I've read a bunch of different posts that seem to be dated over 10 years ago!. 8 liter V6 engines. Intake Manifold Gasket Replacement Valve Cover Gasket Replacement Belt and Hose Replacement Power Steering Pump Replacement Brake Pad Replacement Brake Rotor Replacement Window Motors and Regulators Replacement U-Joint Replacement Air Conditioning Repair Leaking Hoses Tune-Ups Steering and Suspension Check Engine Lights. Next weekend I am actually going to rip off the air plenum to change the valve cover gaskets(oil leak). :) Have to start collecting parts. Crown Automotive Timing Chain Cover Gasket for 93-98 Jeep Grand Cherokee ZJ with 5. Get this fixed asap or like Rky said you'll hydrolock the motor. also before all this i did a leak. I have a small coolant leak from my timing cover and upon reading RAVE it seems like a fairly major task to replace the gasket My question is, can it be done with the motor in situ? I am assuming I don't really need the special LR tools and it looks like pretty good access can be obtained after removing the grille and radiator. It looks like it is coming from above the water pump, but it's hard to tell. Unfortunately I have no choice but to pull the timing cover as I have an internal coolant leak and I'm pretty sure it's there based on what I've read on here. With the pump leaking, it's understandable someone could miss the "other" leak. Lift off the. All good info. Long story, but basically had the usual cracked head. So what the heck, removed the harmonic balancer and took the Timing Chain Cover off. Close the radiator petcock. The upper timing cover gasket is one of the most common places to have an oil leak on your BMW E53. Well I would first start off with a cooling system pressure test to help you determine if you have an internal or external coolant leak. its not dripping but is lightly coated. The valve cover gaskets are probably just the symptom of the leak and not the source. Here are eight of the most common indications that your head gasket has failed: An external oil or coolant leak at the seam between the engine block and cylinder head is a. Picutes of some common areas of coolant leaks on the GM 3. I was upset. Mechanic noticed a coolant leak from timing cover gasket in my 2003 ford taurus whcih has 51,000 miles on it. 0L H6 after a drive, despite not seeing evidence on the floor of my garage of any serious leak. This cover has a gasket, which is prone to leakage over time because your timing chain is built to last much longer than the gasket. Get this fixed asap or like Rky said you'll hydrolock the motor. This keeps the timing chain or belt free from road debris and keeps oil from leaking. The only problem is that the other person's truck (a 1996 Dodge Ram 1500 5. The leak was around a cover in front of the engine and warranty covered the repair. The tensioner gasket shown in photo 1 is blown in the right corner. I have just moved, so this was my first visit to this dealership. This stopped the leak at the timing cover and I'm happy enough about that. If the coolant leak is caught early enough, permanent engine damage may be avoided. @pawpaw i havent really looked inside the valve cover for any sludge, but i should do that. If the gasket at the passage to the block leaks, it will leak externally, instead of dumping coolant into the oil. One of the most complicated cooling system repairs on the N62 8-cylinder engine made easier by aftermarket parts manufacturers. How / Why is this? Well, for starters, this is on the rear side of the engine as determined by the rotating assembly (crank, alternator, etc. I have a 96 Windstar 3. You will need to remove the timing cover and replace the gasket set. been a coolant and oil leak at the timing gear case area near the cylinder head. Both problems lead to engine overheating recurrently. So, this gurgling is air in the cooling system, but the issue is probably how did the air get there or where is the coolant leaking. I was thinkling it would be cheap and easy to replace the water pump and gasket while I had it out. After removal, inspect the cover for corroded aluminum. 2014 Focus timing belt cover leaking Currently on a 5,000 mile road trip and brought my hatchback SE with 40k miles into a Ford dealer for a oil change. The dealership said my Upper Timing Chain Cover has warped and is causing an oil leak. It took me and my helper about 8 hours to do a timing cover gasket on a 2002 V6 AWD. Remember that oil leaks can damage the timing cover gasket, in which case the gasket can no longer protect the timing belt. I think the gasket was just worn out from age/mileage. NAIOA - Forums - Coolant Leak - Timing chain cover help - page 3 - The beginning of last summer I was leaking coolant which a shop told me was the head gasket so I replaced them and it seemed to stop for a while.