Cam Chain Tensioner/Timing Question
Here's what I've got going on if anybody has any advice. I'm probably just doing something wrong, but I can't figure it out.
I lined up my cams and timing chain with the lobes out, engine at TDC and the lines on the camshaft gears parallel with the top of the cylinder head.
I reset the chain tensioner, installed the housing in the case, then put in the spring, washer and bolt.
I've tried this twice and whenever I completely install the chain tensioner, the marks on the camshaft gears are no longer parallel with the top of the cylinder head with the engine TDC mark still lined up. If I turn the engine (always counter-clockwise) to where the marks on the camshaft gears are parallel, then the engine TDC mark is off.
When I first put the tensioner in, the chain will move a little bit as the tensioner pushes against it and nothing moves, but when I install the spring and tighten the center tensioner bolt, everything winds up out of whack when I'm done.
If the marks on the gears are parallel to the top of the cylinder head when I start, by the time I get the tensioner installed, it seems both gears have rotated slightly clockwise and the marks are no longer parallel with the top of the cylinder head.
I was certain I had the marks lined up the first time I reinstalled my cam shafts, but after getting everything back together, found all the marks were off in this manner.
Convinced I must have done something wrong, I took it all back apart and carefully lined up the engine TDC mark and the camshaft gear marks again and then put it all back together again but had the same results in the end.
If anybody has any ideas, I'd appreciate hearing them because I'm kind of stumped.
I would note that before I took anything apart, I checked the TDC reference and the arrow references on the camshaft gears and noted that the arrows on both gears were pointed slightly "down" toward the front and weren't perfectly lined up with the top of the cylinder head. I turned the engine over about 10 times and checked and re-checked that the TDC mark was perfectly centered with the same results.
Is there just a little inherent slop in the chain? My reference arrows are now pointed ever so slightly "down" or "clockwise" from the top of the cylinder head, both to the same degree. They're really close, but not what I would call "perfectly parallel" with the top of the case. It seems to me the teeth on the camshaft gears aren't really that fine and if you've got one of them even one tooth off, it results in a pretty evident disparity between the reference marks on the camshaft gears themselves.
Last edited by planalp; 01-11-2012 at 11:10 AM.