Posted by pete 23 on February 17, 2015 at 19:55:26 from (50.33.19.244):
In Reply to: OIL PUMP posted by gbs on February 16, 2015 at 18:25:31:
A couple of things here, I am sure you will not be able to get the old 7/8th wide pump and not even sure about the 1 in. They may have all gone to the larges one now, hard to tell from parts book. But at any rate, the pump housing changes also with the width of the rotor. Those rotors do wear out badly occasionally and can cause low pressure at low speeds. Also, the gear on the crankshaft that drives the pump wears badly. You can put new rotor onto unused splines if there are any left or replace gear in chassis. The camshaft, being enclosed in the block is really a tough one to replace bushings and you cannot get ahold of the cam from underneath to check for movement. Fortunately, the cam bearing seem to last really well on those engine. We had a lot of problems with the pressure regulating valve. Especially in later 86 series and 50 series tractors. Luckily they are easy to replace. Another thing that uses quite a lot of oil is if it has the very latest rocker arm supports. They each have a jet in them to spray down on the camshaft. That engine should carry good oil pressure at low idle speeds if all is well.
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