low oil pressure model d

WORNOUT

Member
just overhauled model D and have very low oil pressure about 3- 5 psi crank shaft was ground rods resized to .002 .003 on mains and rods, oil pump cleaned and inspected machine shop said pump ok all oil lines are in good shape and tightly attached oil pump pickup screen ok relief valve ok adjusting does not change gauge pressure. what have I overlooked?? need some advise. THANKS
 
Hi......Year of JD Model "D" ?

I own several STYLED JD D's. I have never checked the oil PSI. Engine operating at 185 deg F, 40 weight oil, min Connecting rod bearing clearances, Gauge reads mid span between M H on a new gauge.

Bob....
 
have you considered testing with a test oil pressure gauge? or another tractor pressure gauge to be sure of true reading before you dig deeper?
 

The D was a very low pressure system anyways . The pressure is listed in the factory service bulletins iirc .
Has the oil filter bolt ever been over tightened and bent some internals ?
Did you have a service manual/operator’s manual to know the specs when rebuilding ? Those bearing clearances could be too tight .
 

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