cam chain positioning

1859 Views 13 Replies 6 Participants Last post by ghetto_racer, May 20, 2005

ghetto_racer

Discussion Starter · May 18, 2005

In my manual it states nothing about putting the cam / chain back on and where it should sit. How do I know what position the cam on top should be when it is at TDC for 1-4 or 2-3 ?? I the only mark on the cam is a "T" and that is facing up when it is at TDC for 2-3. Anyone have any ideas ? (Johnny what kind of beer do you like ?

http://img273.echo.cx/my.php?image=dsc029688ei.jpg

http://img273.echo.cx/my.php?image=dsc029699bt.jpg

http://img273.echo.cx/my.php?image=dsc029656fc.jpg

Thanks

J "not that" D

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jbranson

· #5 · May 18, 2005

I think we are getting it worked out.

The engine is basically two 175's glued together. Two of the four pistons go up and down at the same time...but fire alternately just like a 175. He found the timing marks but they are done in such a way that it doesn't appear to matter if the cam is 180 out...hard to explain.
JohnnyB

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jbranson

· #6 · May 18, 2005

Problem solved.

JohnnyB

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jbranson

· #8 · May 18, 2005

It was kinda weird...the sprocket had a line through the center line of the cam all the way from one side of the sprocket to the other. You line that parallel with the top of the head with the crank at TDC. Of course you could rotate the cam 180 degrees and it would still line up....so it specified that the cam lobes for #1 cylinder should be pointing down...that tells you which "180" is the right 180.

Evidently JD is not the first person to be stumped by this on the SOHC fours...I saw numerous mentions of it on the SOHC forums when I did a search.
JohnnyB

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