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95.5-2004 Tacomas & 96-2002 4Runners 4th gen pickups and 3rd gen 4Runners

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Old 03-10-2011, 07:41 PM   #1
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1999 Tacoma 2.7L oil leak from timing chain cover

Hey all,
So I have had my truck, 1999 2.7L 4wd 5spd, for about 3 years now. Have done a bit of maintenance on it since buying, new clutch,flywheel, axle shafts, exhaust, etc, nothing much to the motor except routine stuff. My problem is I have an oil leak that has gotten worse over time, started out as a drip or two and now over 4k mile oil change intervals I probably add 1 - 1 1/2 quarts. Its leaking from the timing chain cover. I don't mind replacing it, however it's a big job. I have something else to drive so if it takes a month working on weekends its no big deal. I am just wondering should I go ahead and change all the components like timing chain, tensioners, water pump, etc, while I am looking at it with the cover off. Or is there any product that actually helps fix oil leaks. The mileage is 159,000 miles btw. Thanks
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Old 03-10-2011, 09:17 PM   #2
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yeah it is a good idea to change items like that when u pull them off. or u could be doing it again sooner then u want.
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Old 03-11-2011, 11:25 AM   #3
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I suggest to just fix the leak and leave other components there. replace crank seal at most
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Old 03-11-2011, 12:30 PM   #4
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Your going to need to replace the HG if you take off the cover. Taking off the cover without replacing the HG will result in a bigger leak. Id suggest a valve job while you've got the head off if you haven't already
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Old 03-11-2011, 05:10 PM   #5
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Yeah I know I have to replace the HG, was also gonna do new Head bolts. Had thought about just doing a valve adjustment though.
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Old 03-14-2011, 04:36 AM   #6
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Anybody else have any suggestions on fixing the leak? Could I re-torque the timing cover bolts and see if that helps reduce/ fix the leak?
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Old 03-16-2011, 12:08 PM   #7
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can you even do valve adjustment on toyota w/ shims?
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Old 03-16-2011, 01:09 PM   #8
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Quote:
Originally Posted by profuse007 View Post
can you even do valve adjustment on toyota w/ shims?
yes, its pretty laborious though
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Old 03-20-2011, 12:42 PM   #9
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Timing chain is a lifetime part according to FSM. Toyota water pumps on a 2.7L are bullet proof. I would just replace the head and timing cover gsket. I would inspect the guides on the chain for excess wear but at 159K, I expect you will be fine.
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Old 03-20-2011, 12:53 PM   #10
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Quote:
Originally Posted by profuse007 View Post
can you even do valve adjustment on toyota w/ shims?
Uh, yes. Toyota has an array of different sized shims. Crappy part is that they are 7 bucks each.

To do it, you either need the SST's or you can do it the easy way and pull the cams.

http://www.yotatech.com/f128/5vz-fe-...t-tech-226997/


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Old 03-20-2011, 12:53 PM
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