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Crank Angle

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John in OH

10-08-2000 19:53:50




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On a '37 B, can anyone tell me what the #1 crank position is when the flywheel LH EXHAUST OPEN mark is lined up with the match mark on the crankcase? Why such a question, you ask?? Due to this tractor's long and sordid history, the flywheel can be installed in any position on the spined end of the crankshaft!!! Thanks in advance.




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clooney

10-09-2000 16:31:07




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 Re: Crank Angle in reply to John in OH, 10-08-2000 19:53:50  
John, when the l/h ex open is lined up on the index mark the L/H exhaust valve should be just starting to open (with the valve lash set correctly)....If that B has petcocks (I don't think it does though) you can stick a pencil in the removed petcock hole then with the flywheel on (it doesn't matter where) you can turn the flywheel in one direction until the L/H piston hits the pencil then mark the flywheel at the index mark, now turn the flywheel in the other direction until the L/H piston hits the pencil again, then mark the flywheel there, then measure 1/2 way between the marks you made then line that mark up with the index mark (that will be true TDC), then pull the flywheel & install it with the impulse mark on the flywheel at the index mark on the case & the flywheel will be on correctly. Without petcocks you can try to put a pencil in the L/H spark plug hole & do the same thing but it will be difficult to tell when the piston hits it.

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John T

10-09-2000 07:37:10




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 Re: Crank Angle in reply to John in OH, 10-08-2000 19:53:50  
This isnt the exact answer you requested, but it may help. First, the flywheel has to be mounted so its out of balance weight is exactly 180 opposite the cluth disk's out of balance weight, to reduce harmoninc vibration. Also, when the number one left flywheel side piston is at TDC on its compression stroke, thats when the LH Impulse Flywheel mark lines up at 3:00 O Clock with that mark on the tractors side. At that time, the governors female mag drive slot should be horizontal and thats when the mags impulse spring trips over and fires the number one cylinder. Ol John T

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