Farmall MD HIGH oil pressure

llamraf · Oct 4, 2009

Whats wrong pegging an 80 psi gauge at low idle. Need help.

Thanks

Janicholson · Oct 4, 2009

If you know the gauge is accurate. Then the regulator in the oil pump is stuck. I would not flinch at 75psi though, common, and just fine. I would use a good gauge and go from there. JimN

pete 23 · Oct 4, 2009

You indicate M diesel, the pressue regulator valve is in the oil filter base and pressure normally runs about 45 psi on the diesel engines. Haven't had base off have you and got gasket on wrong.

IH fan · Oct 5, 2009

(quoted from post at 21:10:23 10/04/09) Whats wrong pegging an 80 psi gauge at low idle. Need help.

Thanks

Don't know about tractor engine speeds, but on a car engine @ higher rpm, too high of oil pressure can "wash out" or errode the rod bearings.

llamraf · Oct 5, 2009

Engine sat for about 10 years prior to restarting. Was fine when was running just taken out of service. Looking for diagram of oil route to try and flush. Any thoughts?

llamraf · Oct 5, 2009

Motor sat for 15+ yrs. Concerned I pumped sludge thru the system. Do you know the route of oil thru the motor? Is there a diagram available to clear as many passages possible without breaking down the engine. Pressure was normal 20-45 when retired/out of service.

scot in pa · Oct 8, 2009

I think I would try a new gauge first, if that is all it ran when parked.

M Diesel · Oct 8, 2009

That 20-40 is weak for sure. As stated, the pressure relief is in the oil filter base. Or I should say the second relief is in the base. There are two. The oil pump has one that goes to about 75 or so, and the filter has another, set to the lower 38-46 psi prescribed value.

There is a large shallow bolt head on the filter base. Remove it and the spring/piston come out. Or should anyways. It may be, and probably is, stuck. IH did not use a ball valve. They are both piston types, with a clearance spec of only a few thousandths. Any, and I mean ANY, crud will cause the piston to stick. Normally they stick open because the spring don't have enough oomph to push it closed with grit trying to slip down past the piston. On the other hand, there is enough surface area on the piston that a little corrosion will stick it, causing high pressure. Also, somebody may have shimmed the bugger tight?

The pump regulator bypasses back into the pan. The filter regulator also bypasses back into the pan.

I haven't checked my MD, but later model crawler filters have a bypass valve as well. All it does is allow oil around the filter.

Farmall MD HIGH oil pressure

llamraf

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Janicholson

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pete 23

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IH fan

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llamraf

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llamraf

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scot in pa

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M Diesel

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