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MOdel M oil pressure

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Anonymous-0

Well-known Member
Buddy of mine has a 47 M which reads low at idle and
slightly above at higher rpm. Search of the archives
does not address any adjustment procedure but talks
a lot about a cover on the pump that could be be
warped. Question is, is there a adjustment? Will
check pressure with another gauge before looking at
the pump. This used as a parade tractor and does not
do any heavy pulling.
 
No, there is no adjustment. The oil pump cover is the first suspect, but probably the issue is with the cover plate being worn rather than warped. Worn out camshaft bearings can also be the culprit, but that is a little more involved.
 
A good tight M engine will run 60 - 70 psi hot and wide open, almost pegs the factory gauge. At hot idle, half scale or better.
 
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