Honda-SOHC
SOHC.co.uk Forums => CB500/550 => Topic started by: SteveW on April 19, 2018, 03:55:56 PM
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Today is the first time I've taken my 550 K0 out for a decent ride since getting it registered.
Normally oil pressure light goes out the minute the engine fires.
Done about 50 miles, but noticed that after about 15 miles the oil pressure light would come on at anything below 2000 rpm.
Let it cool down for an hour and it was back to normal, oil light goes out the minute the engine fires up.
Rode around a bit more and its starts doing it again, oil light on below 2000 to 2500 rpm.
Using 10W 40 oil, oil was only changed 100 miles ago.
Engine sounds normal, bike performs normal.
Seems as if the oil is becoming too thin in the hot weather?
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Just a quick, and cheap, check. If it's been run a fair bit cold and on choke then have a sniff of the oil to see if it smells much of petrol.
It changes the viscosity quite quickly if it has been diluted in this way.
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Just checked and it does smell a bit of petrol.
When I first got the bike, it had been sitting in a barn for years. When I first drained the oil, it really stank of old fuel.
Wonder if there is still some old fuel circulating in there.
Think I'll do another oil change this weekend.
Also whipped one of the tappet covers off, plenty of oil up there so I guess the oil pump is ok?
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Worth trying a different sender, they do go after time
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Sounds like an intermittent oil pressure sensor to me, but good to err on the side of caution as you’re doing..
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I would pop the oil pump off, get a new o'ring kit from Nurse Julie and fit a new switch ;D ;D ;D
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I would pop the oil pump off, get a new o'ring kit from Nurse Julie and fit a new switch ;D ;D ;D
Is that a straightforward job, changing the o-rings?
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Worth trying a different sender, they do go after time
+1
No need to renew pump O-rings, if there's no sign of leaks.
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Worth trying a different sender, they do go after time
+1
No need to renew pump O-rings, if there's no sign of leaks.
The oil pump is like the human heart, parts start wearing out and leaking after 40+ years but you don't know you have a problem until, possibly, it's too late. Agree, fit a new sender unit, most probably the culprit.
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How much for a set of o-rings? Might as well replace them.
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How much for a set of o-rings? Might as well replace them.
I have them on my eBay page for £7.99 but do them for £7.00 inc post to forum members. I also have the oil pressure switch in stock for £14.99. Don't feel obliged to buy them from me though.
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How much for a set of o-rings? Might as well replace them.
I have them on my eBay page for £7.99 but do them for £7.00 inc post to forum members. I also have the oil pressure switch in stock for £14.99. Don't feel obliged to buy them from me though.
I'll take a set of o-rings and a pressure switch, can you PM me your details, thanks :)
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How much for a set of o-rings? Might as well replace them.
I have them on my eBay page for £7.99 but do them for £7.00 inc post to forum members. I also have the oil pressure switch in stock for £14.99. Don't feel obliged to buy them from me though.
I'll take a set of o-rings and a pressure switch, can you PM me your details, thanks :)
PM sent
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Hey Julie could I get a set of O-rings as well?
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Can you PM me details as well pls Julie.
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Steve, the three screws holding the pump can be tough. Maybe do it on a warm engine with a good fitting impact driver. I'd try changing the pressure switch first as that will be quick and on the pump anyway.
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Hey Julie could I get a set of O-rings as well?
PM sent
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Can you PM me details as well pls Julie.
PM sent
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The oil pump is like the human heart, parts start wearing out and leaking after 40+ years but you don't know you have a problem until, possibly, it's too late.
Do you have heart rebuild kits?
Are they primed by filling with vaseline first?
Your peformance with the oil light is how my CB750 was behaving before it was stripped, pure and simple low oil pressure, in my case caused by running with wrong clearances after a rebuild.
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The oil pump is like the human heart, parts start wearing out and leaking after 40+ years but you don't know you have a problem until, possibly, it's too late.
Do you have heart rebuild kits?
Are they primed by filling with vaseline first?
I'm still working on those kits Dave ;D ;D ;D
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Steve, the three screws holding the pump can be tough. Maybe do it on a warm engine with a good fitting impact driver. I'd try changing the pressure switch first as that will be quick and on the pump anyway.
Thanks, I'll warm it up first and take it easy.
Where abouts in Maidenhead are you? I spent all my Childhood in Littlewick Green.
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Steve, the three screws holding the pump can be tough. Maybe do it on a warm engine with a good fitting impact driver. I'd try changing the pressure switch first as that will be quick and on the pump anyway.
You should never use a impact on a oil pump, they can crack very easy. Use a PH3 bit, tap it home and turn with a socket. Try this while the pump is still on the bike because, once the pump is off, it is very hard to clamp it to stop it moving while trying to get those 3 little suckers out ;)
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Steve, I'm out the other side, about 1/2 mile north of the Thames bridge.
Trig, You've done more than me and I haven't had to use it on the cover, but I have found them to be the most stubborn screws on the whole bike, particularly if someone has already been at them and are slightly mangled. Most of the engines I have done have been well neglected and butchered by previous owners and maybe lying in a shed for 20 years. Nothing else has worked for me.
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Steve, I'm out the other side, about 1/2 mile north of the Thames bridge.
Trig, You've done more than me and I haven't had to use it on the cover, but I have found them to be the most stubborn screws on the whole bike, particularly if someone has already been at them and are slightly mangled. Most of the engines I have done have been well neglected and butchered by previous owners and maybe lying in a shed for 20 years. Nothing else has worked for me.
I am with Phil here.
On my rebuild I intended to change the o ring etc but whatever I tried I could not shift those 3 screws and eventually gave up. Thankfully all was ok but I dread ever having to get them off at a future date. They were without doubt the worst 3 fastenings in the whole engine!!!
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I couldn’t shift the 3 screws either. I took the risk and drilled the heads off, once the pump was out the way the studs could be wound out by hand.
My strange oil light fault seems to have been fixed, not sure if it was the o rings or the pressure switch or a combination of the two.