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11,267 Posts
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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Premium Member
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11,267 Posts
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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