Posted by jdemaris on January 01, 2009 at 09:51:23 from (67.142.130.29):
In Reply to: Re: Timing Question. posted by John B. on January 01, 2009 at 09:24:16:
A few examples why that is not always true.
Take an engine that has the reference mark on the flywheel and/or front pulley/balancer reading TDC. That is supposed to indicate that one of the cylinders is at top-dead-center. Now, suppose that cyinder has a broken rod. That mark is then in error- period. It it telling you the piston is at TDC and it is not.
Take an engine that has the front, or back of the crank snapped right off - and I've seen a few. Again, the marks mean nothing.
A mulitiple cylinder engine is basically many engines tied together with a common crankshaft (in most cases). When all is as it should be - yes - the crank has perfect throws and good reference marks - but not always. Each cylinder depends on the pistons relationship to the cylinder it sits in, the valves, etc.
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