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Author oil pressure worries
calidus
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Registered: 27th Oct 02
Location: Lincoln
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21st Feb 05 at 18:13   View User's Profile U2U Member Reply With Quote

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
lee mitchell
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Registered: 26th Jan 01
Location: kent...drive's: eveyones conversion cars hard lol
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21st Feb 05 at 18:30   View User's Profile U2U Member Reply With Quote

could be pressure relief valve sticking etc. get it sorted soon as and DONT DRIVE IT
broster
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Registered: 6th Dec 02
Location: Drives: E39
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21st Feb 05 at 18:34   View Garage View User's Profile U2U Member Reply With Quote

oil pump??
calidus
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Registered: 27th Oct 02
Location: Lincoln
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21st Feb 05 at 18:41   View User's Profile U2U Member Reply With Quote

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?
AdamF
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Registered: 24th Apr 02
Location: Bexhill, East Sussex
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21st Feb 05 at 18:56   View Garage View User's Profile U2U Member Reply With Quote

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
calidus
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Registered: 27th Oct 02
Location: Lincoln
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21st Feb 05 at 19:22   View User's Profile U2U Member Reply With Quote

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?
calidus
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Registered: 27th Oct 02
Location: Lincoln
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21st Feb 05 at 19:39   View User's Profile U2U Member Reply With Quote

argh someone please help me!!!
corsa_jim
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Registered: 21st Sep 03
Location: guisborough
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21st Feb 05 at 20:58   View User's Profile U2U Member Reply With Quote

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
calidus
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Registered: 27th Oct 02
Location: Lincoln
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21st Feb 05 at 21:03   View User's Profile U2U Member Reply With Quote

i checked and the meter said it was operating on and off ok so guess it is ok...dont know what else to check
corsa_jim
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Registered: 21st Sep 03
Location: guisborough
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21st Feb 05 at 21:48   View User's Profile U2U Member Reply With Quote

well for a couple of quid id start with the oil switch its the usual prob

Jim
calidus
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Registered: 27th Oct 02
Location: Lincoln
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21st Feb 05 at 21:50   View User's Profile U2U Member Reply With Quote

okies...robs off to vaux lincs on way home from work...walking lol
miles
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Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
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21st Feb 05 at 22:05   View User's Profile U2U Member Reply With Quote

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.
calidus
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Registered: 27th Oct 02
Location: Lincoln
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21st Feb 05 at 22:15   View User's Profile U2U Member Reply With Quote

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?
calidus
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Registered: 27th Oct 02
Location: Lincoln
User status: Offline
22nd Feb 05 at 16:01   View User's Profile U2U Member Reply With Quote

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
TOMAS
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Registered: 7th Aug 02
Location: Nottinghamshire
User status: Offline
23rd Feb 05 at 10:36   View User's Profile U2U Member Reply With Quote

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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