Honda-SOHC
SOHC.co.uk Forums => CB500/550 => Topic started by: Johnny4428 on August 27, 2020, 02:51:26 PM
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Changed oil today, now lost oil pressure, didn’t change filter but drained oil from filter housing. Any tips! Prime? And yes I have put oil back in.
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I’ve ever had to prime my 550. Maybe the wire has come off the pressure switch or the switch has died.
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So red light staying on?
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550's etc don't need priming, just use the kick start (with ignition off) to get oil around the engine and when you turn ignition on make sure oil light goes out within a few seconds of starting the engine. If the light doesn't go out, check connection to oil pressure switch. How much oil did you put back in?
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I will check wiring - the red light is staying on. I have only put 2 1/2 litres in so far and that is put level to top mark on dip stick. I suspect that the filter area is not filled with oil yet as it was all drained. Reluctant to start engine again until it is sorted. Think it should be about 3.2 litres capacity with filter change.
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Just after the rebuild I had the same issue. I just ran until oil pressure came up and was just fine after that. But didn’t like running it with oil pressure light on. I don’t remember having any trouble before rebuild with oil pressure issues. Would quite fancy trying another oil pump.
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Did you check oil level with dipstick screwed in or resting on thread?
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Resting on thread.
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If you turn the engine over 20 times on the kick start (ignition off) and then check the oil level, is it still on the same place on the dip stick?
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I will try that Julie. And report back.
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20 kicks no difference on oil level so gave it another 20 still no difference. Still sitting at top mark.
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20 kicks no difference on oil level so gave it another 20 still no difference. Still sitting at top mark.
So after that many kicks, oil should have circulated fully. Have you checked the connection to the oil pressure switch yet?
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Not yet Julie, would the light still come on if there was a problem with connection? Also I have had the bike started, very briefly and I am quite sure there is an oil pressure issue.
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Not yet Julie, would the light still come on if there was a problem with connection? Also I have had the bike started, very briefly and I am quite sure there is an oil pressure issue.
I think, but could be totally wrong, the light would stay on if the wiring wasn't connected properly somewhere along the line. Did you have a problem with the oil pump before?
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Never had any issues prior to strip and rebuild. I had this issue on initial start up after rebuild, so suspected oil pressure switch, a new switch was fitted and made no difference at the time. But eventually oil pressure came up and all went quiet. And never had any problems since, until now. I suspect there is not a lot wrong with oil pump since done 500 odd miles.
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On the 400 the light would be off if there was a bad connection, the same on the 500/550, surely. Disconnect wire and see.
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Thanks for all help and comments, had to leave it tonight. Will check connection tomorrow.
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Just worth mentioning. If for any reason you need to remove oil pump you can do it without draining the oil.
Just lean the bike right over against a tree on a lump of foam.
Thats how I changed the O rings in my pump, lost about a teaspoon full.
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Just a long shot - is there an oil pressure relief valve on a bike engine as per a car engine ?
A stuck relief valve can cause similar issues on cars.
I had a very similar problem with a Nissan 2.7 engine after an oil change - turned out to be the new oil filter none return valve was faulty. New oil filter fixed it.
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Relief valve is part of oil pump.
To check if pump is working remove a cam cover end cap and loosen the bolt holding the steel bracket, oil should flood out
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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?
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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?
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 ?
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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.
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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.
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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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Filter dont have check valve, there is a pressure relief or bypass in the bolt. Pickup is at bottom of sump.
Never had to bleed a 500/550oil pump ever, even after rebuild
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Thanks Bryanj, was thinking of that center filter bolt. I am stumped why I had to prime the pump. Might need to pull the sump off and check to make sure oil intake has the short hose connected properly.
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Small pipe would only affect transmission pump as lower end would be below oil
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Thanks Bryanj! Running out of ideas as to why my pump didn’t self prime. When I squirted oil into pressure switch port I certainly got three glugs of air out which I was happy to see. It’s fine now a good kick is enough to activate pressure switch. Good for another 1000 - 1500 miles.