Ford Grain Truck

young tractor · Dec 7, 2015

Hi guys,
I just had my 1966 Ford F-700 grain truck overhauled. It has the 330hd gas motor. It was overhauled by a friend who is a mechanic. I made it 5 miles down the road with a full load of corn and it shut off. I found out the problem. The distributor gear litterly wore off and also wrecked the camshaft gear. What the heck would cause this? The only thing I can think of is the relief valve on the oil pump is stuck. The distributor drives the oil pump. I have an ad on gauge and when the truck is cold the oil pressure is 80 psi or more. When it warms up it is at about 60 psi. Is this excessive oil pressure for this motor? It seems like it to me. I don't want to replace the cam, lifters and distributor gear only to happen again. The oil pump is new with the rebuild. I appreciate all your advice.

Mike M · Dec 7, 2015

Maybe he didn't check them out before and they were just worn out from all the years before ?

Bob · Dec 7, 2015

Was the camshaft replaced? Were the gears lubed with cam lube or equivalent?

juniur · Dec 7, 2015

I'm willing to bet if you disassemble the oil pump you will find a piece of metal stopped to pump from turning. I have seen this happen before. The metal is usually left over from machine work that is done during the rebuilding. It finds its way into the oil galleries and eventually to the pump.

Steve@Advance · Dec 7, 2015

Was the cam replaced? Or the distributor gear? I'm thinking there was a problem with one of the gears. This is not a common problem. Be sure also that the lower bushing in the distributor is OK. It may have been worn and let the gears ride over each other, or it could now be damaged from the trauma.

The oil pressure does sound a little high, but not high enough to cause that in only 5 miles. I have seen them blow the oil filter and not damage the gears. I have seen them twist the pump drive shaft off and not damage the gears.

cole in mo. · Dec 7, 2015

It might be he replaced the oil pump with a light or med duty one, they use a smaller drive rod from the dist. And if he changed the dist to fit the rod, it fit real loose in the bottom bore, causing lots of movement, that would cause the gears to mess up.

dhermesc · Dec 7, 2015

Had a similar thing happen on a Ford 351W. A piece of nylon from the timing gear chipped off and locked up the oil pump stopping the engine on a dime.

kub6040 · Dec 7, 2015

I unlike some will not badger the mechanic until you talk to him , if he is worth his salt he will help you get back going . I learned at one time that any oil pressure over 70psi can cut metal , it may not cut your metal engine but could be to much for bearings?

Olfolks · Dec 7, 2015

Cole has it right I bet. I have seen that before in the HD series FE series big block fords. They have a larger bore where

The dist sits in the block below the cam. The smaller dist will let the gear walk out and wear off the cam and it

Ford Grain Truck

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