is there anything special about that o-ring? It has a metallic luster to it, doesn't it?

what is the material / type?

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If its got a metallic luster I think you found your problem. It should be a 70 durometer Buna oring. Take the size that 911 gave you to the BMW M/C shop or any hydraulic shop and they should have it . Second to the smallest in a metric oring kit.

70 is the hardness and buna is the material its common. Hope this helps.

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Experience : what you receive 3 seconds after you really needed it !!



86 300SDL 387,000? Motor committed suicide
81 300SD 214,000 "new" 132,000 motor
83 300SD 212,000 parts car
83 300SD 147,000

91 F700 5.9 cummins 5spd eaton 298,000
66 AMC rambler American 2dr auto 108,000
95 Chevy 3/4 ton auto 160,000
03 Toyota 4runner 180,000 wifes

What companies metric O-ring kit?

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84 300D, 82 Volvo 244Gl Diesel

Hercules Bulldog is the Mfg. I pick them up at the hydraulic shop that rebuilds my cylinders. They make standard , metric , Japanese Etc. They have a huge master catalog they ship out for free.

The most common O-rings are the buna the black ones. Two durometers 70 for most mobile applications 90 for static applications (boss type fittings ) . Viton would be the brown ones high heat and special apps but they're a PITA they cut / nick real easy.

Everything seems to be throwaway nowadays these kits have saved me more than once.

__________________


Experience : what you receive 3 seconds after you really needed it !!



86 300SDL 387,000? Motor committed suicide
81 300SD 214,000 "new" 132,000 motor
83 300SD 212,000 parts car
83 300SD 147,000

91 F700 5.9 cummins 5spd eaton 298,000
66 AMC rambler American 2dr auto 108,000
95 Chevy 3/4 ton auto 160,000
03 Toyota 4runner 180,000 wifes

Thanks for the info.
Those kits do savey you a lot if trouble and inconvenience.
I have 2 Harbor Freight standard US size type kits and a Metric one that cost less than $8 from Auto Zone.
The Auto Zone kit does not have the Lift Pump O-ring but it does have 24 of the Oil Filter bottom Stem O-Rings and the Lower Fuel Filter Bolt O-ring sizes.
I have not seen it yet but in their ad Harbor Freight is now selling a Metric O-ring kit.

Attached Thumbnails

 

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84 300D, 82 Volvo 244Gl Diesel

the original poster has a 240, can anyone tell me if the Oring is the same size in my 83 w123 300d turbo?

if so I need to do this repair also..

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1983 W123 300D Turbo
2000 F250 7.3 Powerstroke

To the best of my knowlege they are the same sized O-ring. Also it is the Size I used on my 84 300D Lift Pump.

If you are not leaking Diesel into your Crankcase Oil or as some have claimed that a leak there can also cause you to suck in the Crankcase Oil into the Lift Pump. You do not need to change it.

If you have decided to buy the Supply/Lift Pump kit (and the kit does not come with the O-ring) because you are having problems with you Lift Pump I would change O-ring since the Pump is alreay apart.

I changed mine only because I though I was begining to get some Diesel Fuel in my Crankcase Oil. I found that when I checked the Dip Stick my Oil level had risen slightly when I would have expected it to go down slightly.
So I change the O-ring and that fixed it.

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84 300D, 82 Volvo 244Gl Diesel

When I used to see the O-rings in a kit was back between 1975-1980. At that time they did not appear any different than just a black O-ring.

The O-ring I got from the BMW Dealer is just a Black O-ring.

If your O-ring came with the kit no matter what color it is it should be the correct one.

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84 300D, 82 Volvo 244Gl Diesel