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#1
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Low oil pressure after filter change???
Ok really more to the story....
A couple of weeks ago I had a vacuum pump fail. I limped home and shut it down. Oil pressure was normal. After pulling the pump, pulling out the guts and putting the shell back on, I pulled the oil pan and found all of the ball bearings and what I think was all of the other collateral damage. I checked the oil pump screen and it was clean. I pulled it off and checked it. I put in a new oil filter and new oil (store brand as I was going to use it to flush out the system and change it again this weekend). Well now the oil pressure is low. About 1 (slightly less) at idle and about 2+ at 60 MPH. Is there any chance that the filter could be causing this? Could I have pinched the oil pressure line? Thoughts? Thats a little too low for my comfort.
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NC Benz Fuquay-Varina, NC 1979 300D 1983 300D Turbo 260,000 Miles 1984 300D Turbo 345,000 Miles (sons car) OBK #31 1998 Ford Expedition 5.4l (fer Haulin'!) 145,000 1973 19' SeaRay with 115 Mercury TOWER OF POWER! Club Car Golf Cart 36V Ex toys: 1967 Mustang 289 (First Car) Fiat 124TC 1975 Honda CVCC 1980 Audi 5000 Turbo |
#2
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I'd go the easier route first and replace the 2 rubber washers on the oil canister lid rod.
Rule out easy stuff first. Your oil pump is pumping oil. I think min is .5 bar at idle and 2.5 and above above 2400 RPM.
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92 300D 2.5L OM602 OBK #59 |
#3
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I believe spec is .3 bar at idle, and atleast 3 bar by 3000 RPM.
What brand of filter did you use?
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1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg |
#4
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I wouldn't drive it with that kind of oil pressure until the problem was solved. Not sure about the cause?
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#5
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#20 and #21 O-rings are at the very end of that stem on the Oil Filter. Oil that leaks buy will go to the Oil Pan.
Despite the fact that one part of the Stem is smaller than the other the stock size for both O-rings is - 6x10x2mm
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84 300D, 82 Volvo 244Gl Diesel Last edited by Diesel911; 09-23-2009 at 09:13 PM. |
#6
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Quote:
The filter is a Mahle.
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NC Benz Fuquay-Varina, NC 1979 300D 1983 300D Turbo 260,000 Miles 1984 300D Turbo 345,000 Miles (sons car) OBK #31 1998 Ford Expedition 5.4l (fer Haulin'!) 145,000 1973 19' SeaRay with 115 Mercury TOWER OF POWER! Club Car Golf Cart 36V Ex toys: 1967 Mustang 289 (First Car) Fiat 124TC 1975 Honda CVCC 1980 Audi 5000 Turbo |
#7
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Quote:
see thumbnail
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84 300D, 82 Volvo 244Gl Diesel |
#8
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Well it appears that those rubber washers are real hard. I tried putting in some rubber o rings but I dont think that worked. I am still at the lower oil pressure. I may just try replacing the oil filter and try to see what is in the filter case. Any other suggestions? The car seems to run OK and no weird noises. Still afraid to drive it at this pressure.
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NC Benz Fuquay-Varina, NC 1979 300D 1983 300D Turbo 260,000 Miles 1984 300D Turbo 345,000 Miles (sons car) OBK #31 1998 Ford Expedition 5.4l (fer Haulin'!) 145,000 1973 19' SeaRay with 115 Mercury TOWER OF POWER! Club Car Golf Cart 36V Ex toys: 1967 Mustang 289 (First Car) Fiat 124TC 1975 Honda CVCC 1980 Audi 5000 Turbo |
#9
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What Brand of Oil filter did you use just before the Oil pressure drop?
And, when you changed your Oil did the new Oil have a lower viscosity than the old one? It would be nice to check the Oil Pressure with a test gauge; but, there is no easy way to tap into the oil pressure. The main thing is the Oil Pressure is remains in a safe range. In the drawing of the Oil Filter #19 is a Check Valve. I do not know how to access that check Valve but one of the Members said that he found a piece of Cotton in his check valve holding it open.
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84 300D, 82 Volvo 244Gl Diesel |
#10
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If your within the specs called for I'd run it until it fell out of specs. Did you switch grades of oil?
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92 300D 2.5L OM602 OBK #59 |
#11
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2 bars at 60 mph is not within spec and is not normal for any oil.
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#12
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Quote:
The only other thing I did was to change oil (15W40, but a store brand) and I did pull the oil pan and the rubber oil pump pickup to make sure the screen was clean. Perhaps the rubber pickup just isnt seated correctly and is sucking air? Or perhaps there is something caught in the oil pressure gauge line? ARRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRGGGG (there I feel better)
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NC Benz Fuquay-Varina, NC 1979 300D 1983 300D Turbo 260,000 Miles 1984 300D Turbo 345,000 Miles (sons car) OBK #31 1998 Ford Expedition 5.4l (fer Haulin'!) 145,000 1973 19' SeaRay with 115 Mercury TOWER OF POWER! Club Car Golf Cart 36V Ex toys: 1967 Mustang 289 (First Car) Fiat 124TC 1975 Honda CVCC 1980 Audi 5000 Turbo |
#13
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Partial blockage would not cause a low reading IMHO.
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1982 300SD |
#14
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Good luck. Hope you find your issue. Sorry it wasn't something easy.
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92 300D 2.5L OM602 OBK #59 |
#15
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Quote:
Therefore, the only remaining possibility is some slight damage to the oil pump due to small pieces of metal permeating the screen. The damage to the pump is slight and the resulting oil pressure drop is observable. However, running it at that pressure for an extended period of time is not recommended. The recommendations regarding the o-rings will not affect the outcome. |
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