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Old 07-11-2003, 12:11 AM
Posts: n/a
Unhappy 300td oil pressure/pump URGENT QUESTION!

I wish I could have joined this forum under better circumstances, but I'm having a bit of a crisis with my '70 300td non-turbo. I've had low oil pressure, around zero at idle on in-dash PSI gauge, which jumps up a little unevenly and doesn't peg until 2000+ RPMS.

I decided to change the oil pump after changing the oil filter shaft o-rings with no change.

So I remove the old pump to find 12 or so ball bearings inside of the screen. There is also pieces of the cage which held the balls. They are about the size of the balls in a bicycle hub maybe 3-4 milimeter.

My questios are:

1) Where is the bearing from????

2) Will replacing the oil-pump possibly help? If not I can still cut my losses and return the pump.

I posted this on the diesel specific area of this site but do not know if some people are not actively watching that location. Any other advice is welcome. I am stuck in my shop as this is my daily car so please respond!

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Old 07-11-2003, 01:03 AM
Registered User
Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
I suspect the bearings are from the vacuum pump, but don't know for sure (someone with a later model diesel than my 72 220D can help). In this case, you will have no vac, either.

I would replace the sending unit for the oil pressure gauge before replacing the pump, and verify that you do not have serious fuel dilution in the oil (it will smell of diesel if you do) before condeming the pump.

A new pump may help with oil pressure, but not if the main bearing are worn out.

1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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Old 07-11-2003, 01:07 AM
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Join Date: Sep 1999
Location: Cremona, Alta, Canada
Posts: 263
YIKES!!!!. I cannot think of any bearing in the engine that is a ball bearing. Unless one of the oil pump bearings is like that. Can you tell from the cage how big in diameter the bearing might be? Possible front or rear crank bearing but I do not know their construction. It is not good though to find that in the oil screen. I would be parking it untill problem is diagnosed.

82 300SD 110k
91 Caprice SS
92 Jetta TD
97 Cadillac Concours(300hp)
84 Celebrity 4.3L diesel
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