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rebuilt heads


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teg8254
User

Feb 7, 2009, 7:17 PM

Post #1 of 7 (1214 views)
rebuilt heads Sign In

I have a 1989 toyota 4x4 3.0 and had my heads rebuilt cause I burnt a valve.Ive got it back together and it doesnt want to start ,acts as tho its out of time. I can get it to start if I move distributer a notch but still acts out of time.I took it back apart to verify my timing belt, camshaft sprockets and crankshaft are perfectly lined up.Im missing something and am at wits end.Not my first time either.maybe my forth. any ideas?Heads were done by a reputable shop who have been in the business a long time


Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

Feb 7, 2009, 7:38 PM

Post #2 of 7 (1211 views)
Re: rebuilt heads Sign In

Cam timing is very critical. Off one tooth, anywhere, and you'll get these results. Assuming the cam timing is perfect, tight valves can cause a 'retarded' seeming symptom. Also, make sure the distributor is in correctly. On compression stroke on #1, timing mark at TDC, rotor should be pointing exactly at #1 on the dist. cap. Could be off a tooth and just not have enough adjustment to advance the timing far enough.
Loren
SW Washington


teg8254
User

Feb 7, 2009, 7:50 PM

Post #3 of 7 (1209 views)
Re: rebuilt heads Sign In

Im certain my marks are on.#1 is up.I was wondering if it were possible there could be a problem with new heads


Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

Feb 7, 2009, 8:00 PM

Post #4 of 7 (1202 views)
Re: rebuilt heads Sign In

I doubt that it is the heads that is the problem. Make certain that you are on #1 on the compression stroke. (remember the crank goes around twice) Make certain that the distributor is installed correctly. Check valve clearances. Cold: Intake .007-.011 Exhaust: .009-.013...
Loren
SW Washington


teg8254
User

Feb 7, 2009, 8:20 PM

Post #5 of 7 (1201 views)
Re: rebuilt heads Sign In

My valves were adjusted at rebuild shop.I dont wont to go back that far if I can avoid it.How can I be absolutly sure im on compression stroke.My #1 piston is up and timing mark is on zero


teg8254
User

Feb 7, 2009, 8:26 PM

Post #6 of 7 (1199 views)
Re: rebuilt heads Sign In

keep in mind i installed heads when #1 was cylinder was up.Could I have one head on compression and one on exhaust? is that even posible


Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

Feb 7, 2009, 8:41 PM

Post #7 of 7 (1192 views)
Re: rebuilt heads Sign In

There is only one #1 cylinder. I'll attach a firing order for you. Remove #1 spark plug, disable ignition so that you won't get hit by 30,000 volts, have someone 'bump' over the engine for you in very quick on/off bumps until you feel a push of air coming from the spark plug hole. That will be your compression stroke. Then, align the crank mark to TDC, then check your distributor. Note: Firing order 1-2-3-4-5-6 -------OOPS..Pic didn't come thru.
Looking from
Front of engine: 1 3 5 (pass. side)
2 4 6 (driver side)
Loren
SW Washington

(This post was edited by Loren Champlain Sr on Feb 7, 2009, 9:46 PM)






 
 
 






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