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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

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Old 04-02-2009, 07:04 PM   #1
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91' 4Runner 3.0 Head gasket replacement HELP

I have a 91' 4Runner with the 3.0 V6 (3VZE) I am tearing it down to inspect the heads and hopefuly replace the head gaskets if not scrap the motor. I am using a Haynes manual and it tells me to remove the rear main timing cover but it never told me to remove the timing sprockets. Is there any way that is even possible?
Also, Do I have to remove the CAM's if I am pulling the heads off? The book says to do it but it seems like it might not be necessary.... Any Help would be greatly apriciated.
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Old 04-02-2009, 09:34 PM   #2
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Here you should use this. its the full service manual from toyota. Has detailed steps for everything including taking your heads off. http://personal.utulsa.edu/~nathan-buchanan/93fsm/
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Old 04-03-2009, 08:04 AM   #3
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Thanks for the link... I still dont see why the cam's need to come out though. I guess I will see as I get deeper into the motor.
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Old 04-03-2009, 08:47 AM   #4
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Originally Posted by Daytona675 View Post
Thanks for the link... I still dont see why the cam's need to come out though. I guess I will see as I get deeper into the motor.
Yeah, when you find that some of the head bolts are under the cam you'll see indeed.

Here's a tool you can make to help you get those sprockets off:
http://www.yotatech.com/51094700-post10.html

You'll also need leverage on that bolt - like a pipe extension over a 1/2" breaker bar and a six point socket. I personally don't like using impact tools on internal engine parts.

You'll want new cam seals, of course. And you absolutely should adjust the valves once the heads & cams are back on. My exhaust valve clearances tend to tighten up over time, and if yours do too, they could stop closing fully, leading of course to burnt valves.

Don't forget to replace the knock sensor pigtail while you're in there. It dries and cracks and can short, causing the computer to have a canary until you fix it.

If you were able to get the block resurfaced, along with the heads, you could use mls gaskets and have much less likelihood of them going again.
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Old 04-04-2009, 03:25 AM   #5
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There are a TON off good threads on this subject; here are a few:

http://www.yotatech.com/f116/crap-he...-ghost-108156/

http://www.yotatech.com/f116/second-...perate-123651/

http://www.yotatech.com/f116/katie-s...et-job-104934/

http://www.yotatech.com/f116/pics-my...w-going-88538/

http://www.yotatech.com/f116/rune-s-...thread-120824/
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Old 04-04-2009, 08:09 AM   #6
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I did the head gasket job without taking the cam's out of the heads. You just have to rotate the cam out of the way sometimes. Also, replace as many of the coolant bypass hoses that you can while everything is easy to get to. I think I replaced 8 while I had it torn down.
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Old 04-04-2009, 08:21 AM   #7
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The cam has a 27mm (1 1/16") flat in the middle. Once you remove the valve covers, you can put said wrench on the flats to keep the cam from turning, and remove the cam sprocket bolt that way. You cannot let the 27mm wrench turn until it hits the head (the aluminum head is too soft). I cut a slot in a scrap 2x4, and used that the brace the head of the wrench against the fender. It worked very well.
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Old 04-04-2009, 09:08 AM   #8
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The cam has a 27mm (1 1/16") flat in the middle. Once you remove the valve covers, you can put said wrench on the flats to keep the cam from turning, and remove the cam sprocket bolt that way. You cannot let the 27mm wrench turn until it hits the head (the aluminum head is too soft). I cut a slot in a scrap 2x4, and used that the brace the head of the wrench against the fender. It worked very well.

I wish I would have thought of that before I did mine.

The cams have to come out, one way or another. I cut the timing cover in half and removed them seperately. I never even had to remove the timing sprockets. The machine shop took them off to put the new cam seals on.
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Old 04-09-2009, 06:33 AM   #9
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I ran across some good general tips on gaskets here: http://www.robbos.com.au/myweb/Tech_Gaskets.htm
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Old 03-25-2014, 06:24 PM   #10
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Here you should use this. its the full service manual from toyota. Has detailed steps for everything including taking your heads off. http://personal.utulsa.edu/~nathan-buchanan/93fsm/
great link thanks
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Old 08-14-2014, 04:17 AM   #11
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taking head gasket off

if i take my head gasket off my 4 runner its a 3.0 v6 91 model its on gas once i take the heads off will i need to get them machiened
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Old 09-03-2014, 02:26 PM   #12
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before you put the head gaskets on I would buy some copper sealer at your local parts store I did not use it and listened to the factory manual and had to go back to square one since exhaust gas was getting into the cooling system and causing my truck to overheat. learn from my mistake and spend the five dollars for copper spray paint or permatex head gasket sealer and apply it to the block and the gasket.
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Old 09-03-2014, 02:26 PM
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1991, 3.0 3vze, 4runner, 91, bolt, camshaft, gasket, head, kit, removal, replacement, timing, tool, v6, v6 sr5

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