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John Deere A power trouble

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JOhn

09-25-2001 18:49:02




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My cousin has an "A" that is lacking power by about 5 hp. It has .045 aluminum pistons and a mild cam. What could be the problem?????

Thanks,
John




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Phil

09-26-2001 13:02:55




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 Re: John Deere A power trouble in reply to JOhn, 09-25-2001 18:49:02  
Make sure that the tappets are set properly, as ones that are too loose will not give the cam the duration that it is looking for. In addition, if the cam was ground using a reduced 'base circle', be certain that the rocker arms are shimmed up so that the original geometry still holds. The prior response of running the tractor bears quite a bit of weight, as they do need 'run time' to seat the rings and valves. Timing is very important as well....If it's a distributor model, be certain that the mechanical advance is working and that it is the right advance for the tractor. Same goes for a mag, as each has its own impulse retard / running advance. Regardless of what you're told, a timing light, TDC bump-stop & camshaft degree wheel (for flywheel marking) comes in handy with these old Deeres....Lastly, be certain that the carburetor is delivering the proper amount of fuel under load - The dyno is one of the best tools for setting all of the adjustments mentioned, if available... If the bore job left too much skirt clearance, then you have a problem.....Good Luck!

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Gman

09-25-2001 18:57:47




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 Re: John Deere A power trouble in reply to JOhn, 09-25-2001 18:49:02  
John has this engine just been built,aluminum pistons require about ten thousands clearance.The timing could be off just a tad. Take it out and hook it to 3/ 14's plows and work the dickens out of it and see what happens. Less us no the results Gman



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