Timing chain marks

AFLNTRPRZ

MEMBER
CADILLAC SEVILLE

1978 Cadillac Seville, 5.7L.350 olds, fuel injected. The manual says align the marks. When aligned it is not at compression stroke! When opposite it is at compression stroke & #1. Is it ok to put together since it is at T.D.C. & At #1? It was like that when I dismantelled.I was replacing water pump so I decided to put new chain. I have tried turning crankshaft to align, but when I bump engine to align marks # 1, compression stroke is perfectly aligned but opposite side. The crank mark being on top. The cam mark being on top also, should be on bottom. If aligned together it seems to be not pushing my rag out of the #1 spark plug hole. Am I doing it right?

Thursday, February 22nd, 2007 AT 2:49 PM

4 Replies

CHEVY22

MECHANIC
1,375 POSTS

Sounds like your a ok, tdc #1.

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Thursday, February 22nd, 2007 AT 6:30 PM

MATHIASO

MECHANIC
1,209 POSTS

Do you have inserted rag in the spark plug hole and wait untill the piston push it out to confirm that the piston #1 is at TDC? :)
I'm just trying to undertand what is going on.

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Thursday, February 22nd, 2007 AT 7:06 PM

CHEVY22

MECHANIC
1,375 POSTS

Thats what I got out of it

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Thursday, February 22nd, 2007 AT 7:24 PM

MATHIASO

MECHANIC
1,209 POSTS

I just worry that rotating the crancksaft or camsaftf with the timing chain removed would cause valve-to-piston contact. Is that correct?
Just though alignement of timing marks on the camsaft and cranksaft sprokets was enough to indicate TDC number one compression stroke. Just learn about the rags,
* replace the timing chain and sprokets as set. Do not run new chain against worn sproket, or early faillure can occur.

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Thursday, February 22nd, 2007 AT 9:55 PM