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oil pressure on 1949 M farmall

A

Anonymous-0

Well-known Member
After setting for a while it takes about a minute
for oil pressure yo come up to normal. I think the oil is running out of the filter while it isnt running. any advice on a fix would be appreciated.
 
The filter is downstream of the oil pump and only sees a portion of the oil as it flows through the engine (bypass system). The pump is submerged under the oil level in the pan making it difficult to lose prime. Unless you're hearing knocking before the gage is reading low, I bet you have pressure way before it registers on your gage. Could be air in the line, could be a gage problem, or it could be a weak pump. Take the oil line loose from the back of the gage and crank the engine. If oil comes out, you need to replace the gage or live with it being slow. I'd advise replacement with a known good gage before tearing into the engine.
 
I agree, an air bubble in the gauge line will do it every time. Bleed the air out of it at the gauge while running. Jim
 
Actually the line should be filled with air and not oil. On an M it is not so noticeable but on tractors with small oil lines like the 460/560 a line filled with oil will be very slow to react when it is cold.
 
With respect, Oil is not compressible. A filled line need only push 4 or 5 cubic MM to go to full scale. An empty line must compress the air volume and fill it with cold oil. An analogy: puting air into a fluid filled tire takes far less air to reach pressure than a dry tire! We had a combine with a 8 foot clear plastic line for the oil gauge IH SP125. When there was air in the line it would take 20 seconds for the air to compress moving the gauge to read correctly. when the air was gone (bled out by me) the gauge read so rapidly there was no apparent delay. Jim
 
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