SOHC.co.uk Forums > CB350/400

Oil pump oil leak

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McCabe-Thiele (Ted):

--- Quote from: Dolomite_ on March 29, 2026, 08:34:11 PM ---I rebuilt the engine just under 2 years ago so all the seals are pretty much new.

Ted
Is the oil relief valve in the oil pressure switch?

--- End quote ---

Iirc it's built into side of the  oil pump, I could be confused with the 500 oil pump.

Nurse Julie:
The pressure relief valve is in the pump as Ted says.

Dolomite_:
I cleaned the oil from the pump, checked the bolt toque and seals. It all appears fine.

I went out for a ride today and checked when I got back, it's coming from the oil pressure switch. I'm going to check the oil pressure switch is torqued correctly later this week.

Are there any other measures I can take? Or is it a case of replacing the switch and testing it?

Bryanj:
Torque on that part wont work as it is a tapered thread, new switch with a small amout of liquid ptfe or tape and not super tight or you can crack the casing

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