300 oil pump shaft

KenB_Texas · Mar 25, 2010

I noticed my 300 when warm had low oil pressure at idle. The idle is probably to low but so was the oil pressure (20 PSI). I have never had the pan off so I dropped the pan and pulled the pump. The pan and pump looked great no sludge or even dirty oil. BUT there was a lot end play at the top of the pump. I pulled the pump apart. The bottom plate shows hardly any wear but the shaft has a grove at the top. I didn't measure it but it is deep.

What do I do when the pump shaft is worn? Does anyone have new shafts? I thought because there were so many H's around chances are that IH would have one but they are no longer available from IH.

Theman · Mar 25, 2010

20 psi at idle isn't low oil pressure. Low is when the needle sits in the bottom half of the red band or less at idle. These engines will also run for years that way. The PO of a '51 H I bought pulled a 7ft. Corsicana mower through acres of pensacola bahia grass for years with 10 psi oil pressure before it was rebuilt. Unlike your pump, the wear on that oil pump shaft was at the bottom and a replacement shaft from a scrap donor put the oil pressure back where it needs to be.

The folks talking about 70+ psi are just bragging because they have more rope than well.

TractormanNC · Mar 25, 2010

No bragging. A good tight H engine will hold 70 PSI hot at wide open throttle all day long. If it doesn't, you have excess clearance somewhere.

scott mcintosh · Mar 25, 2010

Powermaxparts.com has them listed you will have send email to find dealer near you.Hope this helps Scott

300 oil pump shaft

KenB_Texas

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Theman

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TractormanNC

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scott mcintosh

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