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JD B flywheel timing mark

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David

01-23-2001 17:39:03




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I have a 1949 late model B. I can not find the locating screw on the crankshaft (sheared off, not there???) that is supposed to be aligned with the deep groove on the flywheel. Where is the mark on the end of the crankshaft and what does it look like? Where is the mark on the flywheel and what does it look like. Does the horizontal mark on the sheet metal tranny cover (3 o'clock) and the LH impulse mark line up when the machine is at the TDC position (assuming the crank gear is aligned correctly when viewing internally through the crankcase cover)? Final question on the clutch side - If one tooth is missing on the driving disk, do you think that will that cause a bad imbalance in the machine?

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Ron B.

01-23-2001 21:07:59




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 Re: JD B flywheel timing mark in reply to David, 01-23-2001 17:39:03  
The crankshaft should have a tapped hole in the spline that goes into the deep groove of the flywheel. This tapped hole is for a special little locating screw. Yours no doubt came out. The crankshaft should also have a "V" mark on the end that lines up with a depression mark on the bottom of the flywheel cover opening (with the snap-in plate removed). This way you can set the timing without removing the flywheel cover. However, you need a way to turn the flywheel. JD provided an adapter that was used with the steering wheel for this purpose. Intended to be a way to start the tractor when battery was dead. I have an extra steering wheel for this purpose so I don't have to remove the one on the tractor.
Ron

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John T

01-23-2001 18:09:43




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 Re: JD B flywheel timing mark in reply to David, 01-23-2001 17:39:03  
David, Im not sure of answers to all your questions (I have seen V marks and dots on the parts in question), but heres what I do know. YES, when the left hand number one cylinder is at TDC on its compression stroke, thats when the Left Hand Impulse timing mark on the flywheel is at 3 o clock even with the mark on the tractor. Regarding the cluth disk, if its out of balance weighting is not exactly 180 opposite the flywheels out of balance weighting, YES you will get a substantial vibration. Now, if only one tooth is missing, I dont think that itself would cause much vibration (but may allow disk to loosen up), because the less the weight and the closer it is to the center of the crank, the less effect it has on balance. John T

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