1936 John Deere B FFA Project Need Help

[wsm]

I have found out that the timing is off on a tractor that my som and i are rebuilding for FFA. When we reinstalled the cam we didnt line up the timing marks. Is there any way to get these in line without removing the cam again? Can we do anything with the crank? By raising up the govener can we get this to move enough? Thanks again for the help.

 

[Radiator Bolt Man]

I have an increasing feeling here that you are "flying blind". Do you have any kind of service instructions? At any rate, here is something that should help - this from the JD-4 I&T Shop Seevice Manual for later Model "B" tractors. (PatB)
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VALVE TIMING TEST

Be sure the flywheel is installed correctly. The deep keyway in the flywheel should be placed over the locating screw on shaft.

With valve tappets set to specification, turn flywheel in normal direction of rotation until the exhaust valve if the left cylinder is just beginning to open (.000 tappet gap). At this time, the flywheel mark “L.H. EXHAUST OPEN” should be in register or within one inch of the index mark on gear case or sliding gear shaft cover (At 3:00 o'clock when viewed from left side).

RETIMING OF VALVES – “B” SERIES

Remove clutch and belt pulley. Remove crankcase cover, reduction gear cover and camshaft right bearing. Loosen governor case retaining cap screws and remove camshaft left bearing. Lift end of camshaft up so that camshaft gear and crankshaft gear are out of mesh; then turn crankshaft until valve timing is as specified.

GOVERNOR SHAFT TIMING

When finished with valve timing, install governor with (a) An engine piston at TDC, and (b) The magneto drive flange groove horizontal.

MAGNETO TIMING

With engine at "No. 1 Just fired TDC" and magneto at "No. 1 just fired (top wire)", install magneto with cap screws only finger-tight. Rotate magneto fully to the rear. Reverse rotate flywheel a half revolution, and then bring it back to "No. 1 just fired TDC". Carefully rotate magneto forward until the impulse snaps. Tighten in place. ++++

 

[wsm]

Thanks, great bunch of information.