calidus
Member
Registered: 27th Oct 02
Location: Lincoln
User status: Offline
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oil pressure lite had been blinking ocoming home earlier, now its on permenent, topped up oil still no joy, can feel the oil movin when u remove dipstick which is a good sign my bro says, but i dont know where the sensor/switch woteva it is is located on my c16xe help please 
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lee mitchell
Member
Registered: 26th Jan 01
Location: kent...drive's: eveyones conversion cars hard lol
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could be pressure relief valve sticking etc. get it sorted soon as and DONT DRIVE IT
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
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oil pump??
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calidus
Member
Registered: 27th Oct 02
Location: Lincoln
User status: Offline
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thats wot i was wondering, the car itself seems fine tho  bummer.think i tracked down the sensor to the bk of the engine underneath the car, the loom has been crimped together to mate up with the sxi loom so was gonna get multimeter on it. where is the pressure relief valve? any other symptoms i shud be looking for? shud i discover religion?
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AdamF
Premium Member
Registered: 24th Apr 02
Location: Bexhill, East Sussex
User status: Offline
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could be as simple as a knackered switch or as lee says the pressure release valve. if you take the oil cap off can you see oil spraying around
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calidus
Member
Registered: 27th Oct 02
Location: Lincoln
User status: Offline
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tested the current and it says the switch is operating ok,its going on and off...im after fixing the car by tomoro nite hopefully, i just need ideas what else to check, where is the release valve n how easy to change? expensive? the car tends to get cold on the temp gauge when u drive n go bk to higher revs to warm itself up, does that help diagnose it better people?
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calidus
Member
Registered: 27th Oct 02
Location: Lincoln
User status: Offline
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argh someone please help me!!!
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corsa_jim
Member
Registered: 21st Sep 03
Location: guisborough
User status: Offline
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put a new oil switch in it mate sounds like what mine did usually they are sumwhere near the oil pump on an 8v motor its @ the bk of the engine on the cambelt side it couyld be the same on yours mate
Jim
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calidus
Member
Registered: 27th Oct 02
Location: Lincoln
User status: Offline
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i checked and the meter said it was operating on and off ok so guess it is ok...dont know what else to check
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corsa_jim
Member
Registered: 21st Sep 03
Location: guisborough
User status: Offline
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well for a couple of quid id start with the oil switch its the usual prob
Jim
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calidus
Member
Registered: 27th Oct 02
Location: Lincoln
User status: Offline
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okies...robs off to vaux lincs on way home from work...walking lol
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miles
Member
Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
User status: Offline
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The low pressure light comes on at 4psi IIRC so if it is on because of low oil pressure your engine is probably already fucked! You should also have a very rattly engine so if it appears to be fine aside from the light your probably ok.
The relief valve is a small piston and a spring, the force of the spring keeps the piston closed at low oil pressure (idle), then as revs rise the increased revolutions of the oil pump create more oil pressure, which then moves the piston that reduces the oil pressure to stop the pressure from rising to high.
Sometimes, if there is debris in the oil, the piston can get jammed open, so that at idle there is no oil pressure, but at higher revs you still get good oil pressure.
When I went around Castle Combe in my Nova I came off the track and noticed I had no oil pressure. The relief valve had stuck and later discovered that the big end bearings were scored, I think the cheap bearings didn't like the hard use and so shed metal, this then jammed the relief valve in its bore. Could have happened the other way around, but not really any reason for the relief valve to jam unless there are bits in the oil.
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calidus
Member
Registered: 27th Oct 02
Location: Lincoln
User status: Offline
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well its a lil tappety on start up but its generally quiet, it runs well, and it dont smoke at all,maybe a lil when bouncing off the limiter that is a lil black at the worst of times.
The meter showed that the switch or valve is it??? was opening and closing correctly as it was using n not using current?
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calidus
Member
Registered: 27th Oct 02
Location: Lincoln
User status: Offline
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ok the switch looks like its doing its job etc, and with the dipstick out u can feel waves so i dont know what to try
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TOMAS
Member
Registered: 7th Aug 02
Location: Nottinghamshire
User status: Offline
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Anyone got any GOOD links for instructions on how to clean out the relief valve on a C20Xe engine? Is it much of a job? I want to do this in a couple of weeks time on the next oil change to try and help stop the noisey lifters on startup.
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