Posted by jdemaris on January 01, 2009 at 10:07:34 from (72.171.0.140):
In Reply to: Re: Timing Question. posted by Guido on January 01, 2009 at 09:42:03:
Only when all is correct with that crankshaft. At this point - I'm getting kind of lost as to exactly what you are claiming. Yes - the crank will determine piston placement respective of the cylinder it sits in - as long as the rod is hooked up - be it wrong or correct. If a rod is broken - no. If a rod or piston wrist pin is loose - no. If a piston is broken in half- no. The crank is not the standard reference for determining/verifying if each piston is where it ought to be as it relates to valve operation and igntion timing. Suppose you've got a multiple cylinder crankshaft with one throw for one cylinder out of wack? Then what? As I mentioned earlier, we had to fix a bunch of new Deere diesels that had exactly that problem. With those engines - the TDC Deere timing mark was wrong for one of the cylinders since it was reading from the flwheel bolted to the crank. We discovered the problem after pulling the head, mounting a dial indicator on each piston, one by one, and finding out not all were where they were supposed to be - when they were supposed to be (in relation to the valves and time of fuel injection) . Deere had a run of bad crankshafts in that case.
Your idea is reliant on a perfect crankshaft with every throw for every cylinder being exactly where it ought to be. That does not always happen. Your idea also - in most practical applications - also relies NOT on the crank - but reference marks stamped onto the front damper-pulley, or the flywheel which adds more room for error. If you want, I can list many examples of when and how it happens.
If you are teaching students with the attempt to teach problem-solving and diagnosis - timing goes beyond the idea of general crankshaft reference marks.
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