Re: farmall c low oil pressure

Posted by captaink on April 18, 2006 at 11:39:00 from (66.115.214.56):

In Reply to: Re: farmall c low oil pressure posted by Mark on April 18, 2006 at 09:12:18:

Mark,

With all respect, it is engine design that determines if low oil pressure is acceptable.

The vintage Chevy’s you refer to (40’s and early 50’s) were designed to be low pressure (lower than 30 with 15 being a “normal” reading) oil systems. The connecting rod bearings were oiled by the oil pump delivering oil to troughs under the connecting rods. The connecting rods had “dippers” on them that dipped into the oil and oil lubed the bearings through a hole in the rod cap to the crank surface. Most other parts of the engine were lubricated from the "splash" from the rod dippers and catch troughs and oiling holes. Some of the older Farmalls (F-20 for example) were the same way as well as many of the V-4 Wisconsin engines. Those Chevy’s also had a notorious habit of throwing the # 5 rod through the right side of the block if they were revved to high.

However GMC trucks of the same era were a high pressure oil (normal reading 30 psi or more) system with a drilled crankshaft. The oil was supplied to the rod bearings via passages inside the crankshaft. To get the oil into the bearings it was necessary to have higher oil pressure. The F-12/14 A, B, C, H, M and newer all have the high pressure oiling systems. Normal oil pressure for these engines is over 30 pounds (M’s in good shape will have more than 60 psi).

The stock B and C (may be others also) oil pressure gauge is mounted on the oil filter base and does not take the reading off the cam bearings. If the gauge is working correctly and shows low oil pressure, then there is an issue in the engine that needs to be corrected. Since the A, B, C and a few other models are notorious for warping oil pump plates and having “chunks” of gasket missing, this is likely the cause and should be corrected since this engine is designed to have higher oil pressure. In this case not only is the oil pressure low, but also the oil volume to the crankshaft is also. Ignoring the problem may lead to premature wear inside the engine including rings and pistons.

Replies:

• Re: farmall c low oil pressure Mark 07:39:59 04/20/06 (0)

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