Question about 1988 Pontiac Firebird

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5.7 liter 350 engine is locked up. which engine bearing would cause this or is it a timing chain problem?

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A failed engine bearing would cause this, not a timing chain

Posted on Sep 30, 2010

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I have a1996 chet p.u.1500 4x4 with 350 5.7 liter engine I'm trying to change the timing chain gasket what all do I have to do


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Do you have the 2.2 liter Ecotec 4-cylinder engine, the 3.5 liter V6, or the 3.9 liter V6 engine? If you have the 2.2 liter engine, there may be a camshaft/timing chain issue if you skipped a tooth when you put the chain back on the cams. If it's a 3.5 or a 3.9 liter V6, you may have incorrectly installed the push rods back into the engine. 3.5 liter intake push rods are approx 5 3/4" long, while the exhaust push rods are approx 6" long.
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The 2.2 liter engine uses colored links on the timing chain to align with the marks on the gears. You just have to rotate the engine to where the copper chain link is up on the upper right side of the intake can gear--aligned to the INT diamond on the gear. Then the silver link should be down at about 5 O-Clock on the crankshaft timing mark. The other silver link should then be aligned to the mark on the exhaust cam sprocket. See picture below.

For the 3.0 liter engine, there are marks on the belt that line up with marks on the gears. The book calls out special tools to hold the cam sprockets in alignment while the belt is put on. There is also a special tool to lock the belt onto the crankshaft sprocket. See pictures below.
Please let me know if you have questions.

2.2 liter:

jturcotte_425.gif



jturcotte_426.gif

3.0 liter:
camshaft sprocket alignment with belt marks

jturcotte_427.gif


Camshaft locking tools

jturcotte_428.gif



Crankshaft belt tool

jturcotte_429.gif


Properly adjusted tensioner

jturcotte_430.gif

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1 Answer

30,00 miles back we had computer problems sometimes doors would not lock and other freakish not needed problems popped up. Waco Sam Nay Dodge house- Sam Nay corrected the problem, At the, present it is in...


Not knowing the size of the motor you have in the van,i would start looking at the timing belt or timing chain causing the 20 degree swing. If it is a 3.0 liter engine there maybe some wear on the distributor drive gear causing the problem. The only function the flywheel plays is in starting the engine from starter. Has no direct bearing on the timing. The only thing you would have with a distorted or cracked flywheel would be vibration during driving and starter problems (grinding noise starting) (complete lock up of starter if the teeth on flywheel did not line up with starter. Also the engine does not have to be removed from van to inspect the flywheel. The transaxle can be removed from van with the engine still setting in van to inspect the flywheel. If the van has over 60,000 miles on it then i would look at the timing chain or belt. Also on the slipping of the transaxle during the time it was drove i would say that the bands in transaxle need to be adjusted to correct the problem with the transaxle. Hope this will help you.

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I just replaced my timing chain on my 302 but when I put it all back together it wont turn over like the motor is locked up and you cant turn the crank by hand??? Did I miss something


Sounds like engine is out of time and pistons are hitting valves locking engine up especially if it turned over and ran before you took it apart this is most likely cause. Remove timeing cover and verify timing marks are properly lined up on gears, then roll engine by hand, if it does not turn then it is hydro locked(fluid in cylinders with valves closed) or mechically locked(dropped a foriegn object into cylinders or bearings/pistons seized). good luck, if out of time you could have bent valves. Need to remove heads and verify if engine has a miss when you get it running.

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During a cold start, I have a noisy rattle coming front the front of the engine on the low down side. This continues for about 10 seconds then quiets down. Any ideas? 1997 Nissan pu, 4 cylinder.


Sounds like a timing chain issue, eventually the tensioner builds enough pressure to quiet it. Also check all chain guides, they get damaged with chain noise like what you describe.

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