> If it is the four cylinder tractor engine, the adjustable
> spring loaded
> bypass valve would bypass oil. That is how it limits the
> engine oil pressure rise.
There are actually two valves in the TRactor motor (as in most engines).
The adjustable one dumps oil back into the pan to limit pressure rise; but
there is also a fixed one that will bypass the filter (feeding the galleries
with unfiltered oil) if the drop across the filter becomes too high. Jack's
"theory" is that perhaps this second valve opens even under normal
conditions ... which certainly seems possible to me.
Early TRactor motors actually used a "bypass" filter arrangement where the
galleries always got unfiltered oil. The filtered oil was returned to the
sump ! Change point was around TS12650E.
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