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#1
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Oil Pressure guage stays up at 3
My oil pressure gauge bottoms out when the enging is off but then shoots up to 3 when the engine is on. This is despite a massive oil leak and the dip stick telling me that I'm down 3 quarts.
The leak is coming from the oil return tube coming off the turbo and I can't get a clear picture of whether the tube is busted or the grommet is broken. Any ideas? 1985 300SD Turbo. |
#2
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When the engine is cold, that is a normal oil pressure.
The oil leak from the turbo oil return tube would likely be from the O-rings hardening at the joint where the 2 sections mate. Also, the grommet at the bottom gets pretty hard and fails to seal. From what I've read this is a pretty common oil leak area on this engine but really simple, and inexpensive, to repair.
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Sam 84 300SD 350K+ miles ( Blue Belle ) |
#3
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If the gauge is staying pegged at 3 bar even when at operating temp, then its most likely your electric pressure sender going out. The W126's have an electrice sender at the oil filter housing that is known to fail, whereas the W123's have a straight oil feed line to the cluster.
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Seth 1984 300D 225K 1985 300D Donor body 1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!! 1980 300SD 311K My New Baby. 1979 BMW 633csi 62K+++? Dead odo |
#4
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oil return tube is not under pressure, it just gravity drains to the pan, so it leaking will not affect your oil pressure. also being down 3 quarts will not affect your pressure, that is, unless you are stopping or starting or turning and starve the oil pump of oil. the 8 quart system most of us have really gives us a pretty safe margin of leakage...
how are you reading the dipstick to show 3 quarts down? John
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#5
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Oil pressure
That is the oil pressure not the oil level and is measured from the oil pump
so you can still be low and have good oil pressure witch is a good thing to have
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Keeping 'em Running 1990 300SEL 1994 E320 1989 E300 |
#6
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The oil pressure sender is a $50+ part. Anyone know of a way to test it to be sure it's bad?
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#7
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Quote:
I eyeballed the dipstick, made an estimate, put in 3 qrts. and the dipstick had oil right at the full line. Not scientific, but I think it works. |
#8
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Ahh, that makes sense.
I was wondering if I was missing some mark on mine. John
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#9
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Once the wire for my oil pressure sensor came off and the gauge went to 3 bar, since i had had this car for two years I knew what the oil pressure should have been at that temp, so I checked out the oil pressure sensor and sure enough the wire was just dangling. So check that first.
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1984 Euro 300SDC, (4spd standard) 1986 Toyota Landcruiser Diesel HJ60 5spd X2 Gone but not forgotten (some sold, some stripped) 1983 300 SD, 1985 300 SD, 1983 240D, 1986 300 SDL, 1985 300 SDL, 1983 300 D, 1984 300 D, 1985 300SD, 1987 300 SDL, 1983 300 SD, 1985 300 TD Euro, 1983 380SEC, 1990 300 D, 1987 300D, 1982 300D, 1982 300D, 1994 E420, 1987 300 TD, 1987 300 D, 1984 300 D |
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