Cub oil pressure dropping

amtrac · Aug 9, 2019

What causes an oil pressure drop from 35 lbs cold to about 10 lbs when the engine gets up to running temp? Have been running 10W40 in it and noticed the pressure was not very high on the old oil gauge, so I put a new gauge on it. Pressure dropped to about 10 lbs on the new gauge. Today I tried running straight SAE 30, and the same thing is happening. New filter and gasket, no leaks and I did check the oil hole in the bottom of the filter bolt, that is not clogged. Also, no hydraulic oil is leaking into the engine oil. Any ideas what my problem may be coming from? Ten pounds of pressure does not seem adequate to me or is it acceptable in these engines?

old · Aug 9, 2019

That is normal. Cold oil is thick hot oil is thin so pressure goes down. 10PSI is also pretty normal for an old tractor

47fivewindow · Aug 10, 2019

10lbs is good on an old cub. The old gauges didn't have numbers just red and white. 10lbs would have been in the low end of the white "good" range.

amtrac · Aug 10, 2019

Thanks guys I feel a little better now. I have been cutting two acres of grass once week for three summers now, and there are no signs of engine trouble, so I guess she's good to go on that 10 pounds of pressure.

Janicholson · Aug 10, 2019

15-40 oil will not hurt it. The oil pump is part of the block. No possible repair can be made, so living with the pressure is your option. Jim

Cub oil pressure dropping

amtrac

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old

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47fivewindow

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amtrac

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Janicholson

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