SOHC.co.uk Forums > CB500/550

Oil pressure.

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Johnny4428:
Ok here’s one for engineers and mechanics of which I am neither. I have had a bit of niggling doubt about the oil pump on my 550. So have had a gauge fitted to the oil gallery plug underneath the points cover and have done an initial low revs check at idle to 2500rpm. So far I have had 40psi at idle and 60psi at 2500rpm. With nothing to compare against, and the general question asked on mr Google, coming back with a very vague answer, any guidance would be much appreciated.

Nurse Julie:
By what I remember, anything much over 60 psi at the oil pump, the pressure relief valve on the pump should open, thus stabising the pressure. If its valve is opening early, the spring could have gone weak or the gap is too large between the giroters, or there is pitting on the giroter surfaces. How accurate is your gauge? Have you got oil flow at the camshaft?

Bryanj:
40psi at cold idle is good, i think the pressure switch trips at 7psi so anything over that at hot idle must be ok by mr honda.
As said i think 60 is about where the relief valve opens

Trigger:
What is your RPM at tick over ? .
The only way to get a accurate reading is removing the oil pressure switch and screwing in a pressure tester at the pump. Bryan is correct, the oil pressure switch is set at 7.1 psi  ;)

Trigger:
While we are on the subject of oil pressure. A couple of years ago i bought 5 NOS oil pumps in sealed Honda boxes , fitted one to a engine, started the bike and bang. After replacing the oil filter and a new housing I found that the pressure relief valve in the wrong way.




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