Diesel Forty Starting Engine

Thanks naylorbros - I didn't know the starting engines shared the same piston as a ten. I tried those numbers with Cat and they must be long gone from their system. Don't suppose you know the ring gap spec or standard piston measurements?

Thanks
Nathan

Ken, it's the case that the first two cylinder starting engines were literally half of a Ten engine right? Would that also mean in addition to pistons and rings, that the rods, big ends, valves, and associated parts would also be shared with the Ten?

The problem I have right now is I do not have a Diesel 35 or 40 parts book here so most of this is going off of memory. The rod is a different part number than the 10 because of the difference between splash lube used on the starting engine and the pressure system used on the Ten. I would guess that the length of the rod is also different. The small end bushing is the same along with the big end shims and rod bolts. The valves, valve guides, springs, locks, retainers, lifters and adjusting screw and lock, the lifter guide are all the same as the Ten. The valve spring cover, gasket and nut assembly are the same as the Ten, but the nut changed from cast iron to die cast somewhere along the way. Camshaft end plug the same as the Ten

There is a parts book for the Diesel 35 in the library.

Ring gap should be .012" to .020" for comp and oil rings. Cast iron pistons having a skirt clearance of more than .012" to .005" should be replaced. New cast iron piston in a reconditioned cylinder bore should have a skirt clearance .003" to .005" An aluminum piston should have a skirt clearance of .010" to .012"