I think Bob is on to something. On the side of the inj. pump you'll see a long rocking lever that goes down to the advance mechanism, opposite side from the throttle hook up. With the truck running at idle, take a long screwdriver and push IN on the bottom of the rocking lever. IF the advance is doing its job properly, you should hear a VERY NOTICABLE rpm change.. On a reman unit, it will almost stall the engine.. IF you cant hear an rpm change, chances are the advance bore is worn to the point it needs to be reamed oversized and an o/s piston installed. You could try to advance the pump to engine timing slightly to compensate for the worn bore by loosening the 3 hold down bolts and rotating the pump slightly.. ITS NOT a FIX, but it will get the old farm truck purrin' again.. and you wont have to pull the pump.
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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