SOHC.co.uk Forums > CB500/550

No oil pressure.

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Johnny4428:
She,s back with a little intervention! Disconnected wire to oil pressure switch this morning and light goes out. So decided to remove oil pressure switch and prime pump with oil, popped pressure switch back in and connected wire fired up bike and within seconds oil pressure light went out. Checked oil level gone down to just above lower mark now I’ll be able to put rest of oil in. Shouldn’t have to prime pump but if that’s what it takes that’s what I’ll do. Any thoughts?

McCabe-Thiele (Ted):

--- Quote from: Johnny4428 on August 28, 2020, 12:07:25 PM ---She,s back with a little intervention! Disconnected wire to oil pressure switch this morning and light goes out. So decided to remove oil pressure switch and prime pump with oil, popped pressure switch back in and connected wire fired up bike and within seconds oil pressure light went out. Checked oil level gone down to just above lower mark now I’ll be able to put rest of oil in. Shouldn’t have to prime pump but if that’s what it takes that’s what I’ll do. Any thoughts?

--- End quote ---

As the sump was not up to level maybee just not enough of a head of static oil pressure to fill oil pump ?
Is oil pick up pipe if there is one  where it should be to prime the pump sufficiently, poor seal between pick up pipe & pump ?

Johnny4428:
Actually the sump had the correct level,it was up to the top mark on dipstick, but I did toy with the idea of just putting the correct amount of oil in to give a slightly bigger pressure to the pump. Didn’t want to overfill. I think the difference would be very little. I would like to try an oil pressure gauge on it to see how the pump is performing.

McCabe-Thiele (Ted):
Was the oil filter faulty the none return valve in cheaper car filters can be an issue especially none OEM ones.
I'm trying to think outside the box.

Johnny4428:
I did wonder about filter and in particular the check valve, but I just emptied oil and didn’t replace filter.

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