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Crankshaft timing marks for compression TDC or exhaust TDC? 850 1996

posted by  mapleleafer on  Mon Oct 8 20:05 CST 2012
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last visit: Wed Oct 9 00:36 CST 2013
[RELATED]

Rob

I have to chime in bacause nobody caught this serious error. When the crank mark is aligned for matching the cam marks (sprockets or slots), number one piston is NOT! at TDC. It is 90° before, ergo halfway down, so that no piston is at TDC (5 or 6 cyl version). Is is one of the few safe positions to ensure that piston-valve contact cannot occur no matter when the cams are.

If you use the crank mark or Volvo locking tool before placing the camholder down, you're safe. If you put #1 at TDC visually and then put it together, it wont run.






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