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B aint runnin right

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peter

10-30-2002 18:10:23

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1951 b runs very unevan no. 1 how do you time one correctly with a light. no.2 if govenor bearing above flywheel is bad will this affect steady idle and other speeds no.3 correct point gap no.4could i have put pistons in wronge and thats why it wont run smooth i have new aluminium pistons 45000ths over no.5 could cam be bad when it will run good sometimes no. 6 my wife says it dont sound like other jd b we here at tractor pulls any help would be appreciated peter in michigan

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Colby

10-31-2002 12:52:08

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Re: b aint runnin right in reply to peter, 10-30-2002 18:10:23

sounds like carburetor problems to me. 2 cents worth

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Clooney

10-31-2002 06:27:56

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Re: b aint runnin right in reply to peter, 10-30-2002 18:10:23

Peter, first, make sure the flywheel is installed correctly, then you should use the flywheel [L/H ex open] to make sure the cam is timed correctly. {the L/H ex open mark on the flywheel should line up within 1" of the case mark as the L/H exhaust valve is just starting to open, {0_lash with the valve clearance set correctly}. If that is ok, then you can either use an adjustable advance timing light to check the running timing {most programmable lights will need you to lie to them & tell them there are more cylinders due to the spark at every TDC on the Deere B}. Or degree the flywheel, or degree the circumference of the center hole in the flywheel cover & use a conventional light. ~To degree the flywheel; use a tape measure to measure the circumference of the flywheel, then divide by 360 [that will give you the inches per degree], then multiply that number by 25 [25�] , that will give you the distance in inches on the flywheel rim for 25�, then measure in the advanced direction from the TDC mark on the flywheel that amount & put a mark. Use that mark & your light to check the running timing.
~It�s possible you could have a bad cam but I have seen a few with worn cams & it will usually still idle ok
~Same with the governor bearing, that can effect governor control but not usually at a steady RPM or idle. Pull the linkage from the carb lever & operate the carb by hand, if it still acts up the bearing/governor isn�t the problem �..

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