Hi, DO NOT TURN IP BACKWARDS. Scribe at mark from IP hub to IP drive gear. This is your reference mark. As I described in my previous post the IP pump drive shaft only makes 1 rev for every 2 revs of the crankshaft that is the reason the timing and IP pump drive gear can be lined up perfectly but IP is 180 degrees or 1 rev out of time. To correct the 180 degree out of time, the IP hub and drive gear are scribed with a reference mark, then the 3 bolts are removed from the IP drive hub disconnecting it from the IP drive gear, then with a wrench on the big nut on the IP drive shaft turn the nut 1 rev in the direction of the normal IP rotation and align the scribe marks and reinstall the 3 hub bolts.The reason this works is the IP drive gear remains stationary while the IP drive shaft is turned 1 rev. If the engine is worse to restore back, repeat process and turn IP hub nut 1 rev in normal IP drive rotation.
Math: Crankshaft turns 1 rev or 360 degrees, IP pump turns 1/2 Rev or 180 degrees.
I hope you can understand my explanation and procedure to turn IP pump drive shaft 1 rev.
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Today's Featured Article - Recollections of a John Deere GP - by Charlie Cook. I grew up on my dad's 280 acre general farm in Western Michigan. Dad's only tractor when I was very young was the old GP. My first recollection of this tractor was when dad allowed my brother and myself to ride on the tractor with him driving. One of us would sit on the left fender (away from the clutch) and other would sit on the gas tank and hold onto the crankcase breather pipe.
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