GEN 3 V6 Valve Cover Leak - Toyota Nation Forum : Toyota Car and Truck Forums


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Old 01-23-2008, 05:00 PM   #1 (permalink)
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3rd Generation GEN 3 V6 Valve Cover Leak

Hi.

Finally found the source of my oil leak, it's from the valve cover and from the rear near the firewall.

Problem is that I can't get acess to the size 10 bolts. Everything is in the way.

Has someone had this problem before, if yes, pls help.

Does the intake manifold have to come off ?

Thank you
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Old 01-23-2008, 05:08 PM   #2 (permalink)
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yes, it's a common maintenance item on our engines

to get to the valve cover, the intake plenum must be removed along with the egr and the rear wiring harness

it's a bit of a bitch to do, but can be easily done
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Old 01-23-2008, 05:21 PM   #3 (permalink)
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Thank you for your reply.

Ah crap, funny that the front bank does not leak only the rear.

look's like i will need to look up some info in the repair manuals.

thanx
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Old 01-23-2008, 06:19 PM   #4 (permalink)
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assuming you have the 1mz-fe, id replace both valve cover gaskets at the same time...also check your rear main seals and oil pan gasket for leaks as they are all common sources of leaks for the V6 powered camrys
to get acess to the rear bank you must remove the intake plenium, egr and rear wiring harness as king stated....
its relativly easy to remove...this diagram might be of some help
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Old 01-23-2008, 08:38 PM   #5 (permalink)
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^ ahem...

and how do you recommend he check and perhaps change his rear main seal as "regular" maintenance when he is asking about the rear valve cover?

I agree fully on the oil pan gasket part though...wouldn't hurt to take a look at that for sure
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Old 01-23-2008, 10:07 PM   #6 (permalink)
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haha just a suggestion....always good to keep an eye on stuff....i tend to see leaking rear mains so i just like to check them
the oil pan should always be re sealed at some point no matter what...it almost always starts to leak
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Old 01-24-2008, 08:16 AM   #7 (permalink)
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i have the same problem i was just looking a kits last night figured i get it done when i do the tanny swap it think it was 34 bucks the jit was
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Old 01-24-2008, 10:54 AM   #8 (permalink)
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the upper plenum(and all attatchements) must be removed as well as the wiring harness held onto the valve cover by two 10mm nuts. once those are removed, a long extension for the rear most bolts is needed. i've done this twice and the bugger is still leaking. is due again. the leaky gasket on the rear bank is a common problem and you will be able to smell the burning oil at idle after the engine has been running for a few. its really annoying when you smell burning oil at a stop light. once you replace the valve cover gaskets once, you will feel as though its a piece of cake.
as a note, when reinstalling the valve cover with new gasket, make sure you do not overtighten the bolts, as the valve cover will crack easialy.
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Old 01-24-2008, 12:17 PM   #9 (permalink)
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make sure the bracket on the back doesnt get under the intake plenum.. cracked my intake plenum cause of that mistake.
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Old 01-24-2008, 05:35 PM   #10 (permalink)
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Thanx for all the replies.

I've already cracked on the bolts that i could get acess to. Near the PCV Valve area.

I've been working on my car in the basement. Lighting will be critical for this repair.

Hopefully, the leak can wait till spring.

cheers
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Old 01-24-2008, 05:58 PM   #11 (permalink)
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I replaced my rear valve cover back in the fall but I didn't get it in there right, so I just took it to a local shop and had them put on a genuine toyota gasket. It took them about 3.5 hours to do. But now it doesn't leak, so to me, it was worth it
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Old 11-22-2009, 11:04 AM   #12 (permalink)
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what is the spec for tightening the bolts on v6. How much torque do you put?
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Old 11-23-2009, 07:27 AM   #13 (permalink)
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Quote:
Originally Posted by muminiasty View Post
what is the spec for tightening the bolts on v6. How much torque do you put?
the bolts must be torqued across from one another in an irregular pattern and must be torqued in small increments. the torque spec is 52 in/lbs. just replaced the gaskets last week.
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Old 11-23-2009, 07:30 AM   #14 (permalink)
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Quote:
Originally Posted by JJJJJJ View Post
Use the OEM gaskets and bolts (replace them all if you can) otherwise you'll have leaks all over again.
oem gaskets are great and felpro's perma dry series is very good as well. you definatly want to use the oem bolts and you should replace the washers with the rubber pad if the job is done correctly. i just replaced my washers because the rubber had deteriorated. i have the part numbers available upon request and can do a writeup with pics for anyone that has questions on the valve cover gasket replacement on a 3VZ-FE.
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Old 11-23-2009, 07:14 PM   #15 (permalink)
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is 52in /lbs also on 1mz-fe engine? 97 v6
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