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Registered
Join Date: Oct 2001
Location: San Carlos, CA US
Posts: 5,529
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no-low oil pressure (on guage) upon engine reinstall
Took the 1980 911SC engine out, removed headers and intake, cleaned off all the gunk, installed some new seals, Orings, installed tensioner upgrade, etc. Did not touch the heads, camshafts, or the bottom half.
Put the engine back, put in 11 quarts of oil and fired it up. 1. Oil level is full 2. No oil or fuel leaks. 3. No weird sound. 4. The green engine oil pressure light goes on with the key in the ignition but goes off after engine starts. Here is the possible glitch: the oil pressure guage remains below 0 at idle and at light throttle (2000 rpm). While the engine idles, I measured the voltage at the oil-pressure sender ( the large round thing next to the fan on the right hand side ) I did not wait for the engine to warm up and turned the car off immediately. Since the oil pressure warning light is not on, I am inclined to think it is OK, but want to get a second, or third, or fourth opinion. Is the guage supposed to read that low until the engine is hot? Is it the oil pressure sender?
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Porsche 2005 GT3, 2006 997S with bore-scoring Exotic: Ferrari F360F1 TDF, Ferrari 328 GTS Disposable Car: BMW 530xiT, 2008 Mini Cooper S Two-wheel art: Ducati 907IE, Ducati 851 |
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12-31-2003, 01:31 PM
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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 56,265
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You should have oil pressure. I'd grab a cheap gauge from an autoparts store and stick that in to see if it reads differently. That way you either know you have a problem, or you have a gauge problem.
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa  SOLD 2004 - gone but not forgotten
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12-31-2003, 01:44 PM
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Registered
Join Date: Dec 2003
Posts: 508
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How was the pressure before you did the work?
Ditto on getting another gauge to verify.
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anh911 '94 Dakota - Meh '98 Moto Guzzi - woo hoo 911; XJS; Islander 36; All Sold '97 YZF1000RJ - Totaled (Not by me) |
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12-31-2003, 03:15 PM
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You do not have permissi
Join Date: Aug 2001
Location: midwest
Posts: 39,976
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If you want to be extra carefull, take out the spark plugs, disable the fuel and ignition, and just have crank until pressure comes up...a few seconds max.
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Meanwhile other things are still happening. |
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12-31-2003, 03:49 PM
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Registered
Join Date: Oct 2001
Location: San Carlos, CA US
Posts: 5,529
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False alarm. I disconnect the wire, measure its voltage, it reads 5 volts open, sounds right. Measure the resistance across the sender, 9 ohms, sounds ok. Turn the engine back on, the sender reads 500 ohms, connect the wire back, and the oil pressure gauge now reads 4 bar with cold engine as it should.
Must be some weird wiring-gauge issues. It is all sorted out. Thanks for the suggestions.
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Porsche 2005 GT3, 2006 997S with bore-scoring Exotic: Ferrari F360F1 TDF, Ferrari 328 GTS Disposable Car: BMW 530xiT, 2008 Mini Cooper S Two-wheel art: Ducati 907IE, Ducati 851 |
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12-31-2003, 04:08 PM
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Senior Member
Join Date: Feb 2000
Location: Lacey, WA. USA
Posts: 25,308
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I made a trip across Washington while my car stayed parked, and I had removed the ignition rotor and fuel pump relay as part of my theft-prevention strategy. When I returned, it was VERY cold and I cranked the engine without those parts. Couple of seconds I got oil pressure, and it seemed to rise about a bar per rotation or two, I let go of the key quickly but oil pressure was already at 4 bar. And rising fast. With just the starter. I love my car.
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Man of Carbon Fiber (stronger than steel) Mocha 1978 911SC. "Coco" |
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12-31-2003, 04:43 PM
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