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  #1  
Old 09-23-2009, 06:20 PM
Thelastboyscout's Avatar
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83 300 D oil in diesel fuel

Forum,
Still looking for a thread or help to resolve seeing oil in my diesel fuel through both the fuel filter and replacing the fuel line out of the tank. The fuel that drained out from replacing the line also showed up with a dark hue.

Can anyone direct me to an existing thread or tell me if you've had the same experience and direction for diagnosing/resolving the problem?

Thank you.
The Last Boy Scout

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  #2  
Old 09-23-2009, 06:56 PM
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Posts: 18,350
o-ring on the lift pump. There was a thread specifically on this topic within the last 2 weeks with a picture of the pump and ring.
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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
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  #3  
Old 09-23-2009, 08:27 PM
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Quote:
Originally Posted by Thelastboyscout View Post
Forum,
Still looking for a thread or help to resolve seeing oil in my diesel fuel through both the fuel filter and replacing the fuel line out of the tank. The fuel that drained out from replacing the line also showed up with a dark hue.

Can anyone direct me to an existing thread or tell me if you've had the same experience and direction for diagnosing/resolving the problem?

Thank you.
The Last Boy Scout
I posted about this recently – anyway here’s how to fix it.

Problem – Engine oil contamination of fuel – Remedy:-

Replacement of oil-seal between fuel lift-pump and IP applicable on all 616/617 and earlier engines with hand primer Pump.

1) Remove oil supply line to IP. Two banjo bolts (12mm). Handle very carefully as plastic pipe is brittle!

2) Remove fuel lift-pump from IP – three M6 nuts. You need a short 10mm open/ring. Be ready to catch about half-pint of engine oil when you break seal.

3) Remove spring clip that retains roller/cam follower assy. and lift out. Withdraw the 5mm push rod with long nose pliers.

4) Remove old 5mm “O” ring (if still there!) from groove in bore and clean out groove. An old dental pick is ideal for this.

5) Replace with 5mmØ x 1.50mm “O” ring only. A 1.25mm or 1.75 ring will not work. Kit not available from MB agent – must be synthetic so a bearing/oil seal store is your best source. (Tip - push ring sideways into bore first and roll it into groove with 2mm rod)

6) Remove pipe fittings and valves to clean thoroughly.

7) Re-assemble making new gasket if necessary.

Time? ± one hour.

Have a nice day
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  #4  
Old 09-23-2009, 09:30 PM
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Location: The Alamo City, TEXAS
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I have asked at the local hardware store and 2 McParts places with no luck finding metric O-rings. What is a bearing/oil seal store?

BTW beagle, your thread was golden - really cool diy fix!
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Current Mercedes
1979 maple yellow 240D 4-speed


Gone and fondly remembered:
1980 orient red 240D 4-speed

Gone and NOT fondly remembered:
1982 Chna Blue 300TD

Other car in the stable:
2013 VW Jetta Sportwagen TDI / 6-speed MT

Last edited by zeke; 09-24-2009 at 02:08 PM.
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  #5  
Old 09-24-2009, 12:36 AM
compress ignite's Avatar
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Join Date: Feb 2004
Location: 32(degrees) North by 81(degrees) West
Posts: 5,554
Bosch Service Station

The Bosch Diesel "Workshop" will have your o-ring

Pick one Near You...
http://www.boschservice.com/ServiceLocations/ImageMapResults/ImageMapResults.htm?st=TX&typ=DC&cntry=USA If you're in Texas.
OR
http://www.boschservice.com/ServiceLocations/DieselServiceCenter/
North America

For Example the Robert Bosch Gmbh Service organization in the US maintains
an automated illustrated electronic parts catalog online for it's dealers...
This is a link to user instructions for the dealers:http://www.boschservice.com/NR/rdonlyres/4AE3BCDA-71B8-4B0D-ADFD-53B2B6DEFBC8/0/TDI.pdf
Even from the user guide alone you can see the incredible information AND
detail (In User FRIENDLY form) that allows the Bosch dealers to service their
customers [From MTU operators to VW TDI owners to Freightliner fleets]
These guys KNOW their stuff! (Not like dealing with the local "Mac MB" parts counter.)
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Last edited by compress ignite; 09-24-2009 at 12:49 AM.
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  #6  
Old 09-24-2009, 12:44 AM
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Posts: 296
Quote:
Originally Posted by zeke View Post
What is a bearing/oil seal store?
A store specializing in bearings and oil seals. Try yellow pages or phone any Auto Service manager - he should be able to recommend one in your area.

Good Luck!
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  #7  
Old 09-24-2009, 01:06 AM
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Quote:
Originally Posted by Beagle View Post
I posted about this recently – anyway here’s how to fix it.

Problem – Engine oil contamination of fuel – Remedy:-

Replacement of oil-seal between fuel lift-pump and IP applicable on all 616/617 and earlier engines with hand primer Pump.

1) Remove oil supply line to IP. Two banjo bolts (12mm). Handle very carefully as plastic pipe is brittle!

2) Remove fuel lift-pump from IP – three M6 nuts. You need a short 10mm open/ring. Be ready to catch about half-pint of engine oil when you break seal.

3) Remove spring clip that retains roller/cam follower assy. and lift out. Withdraw the 5mm push rod with long nose pliers.

4) Remove old 5mm “O” ring (if still there!) from groove in bore and clean out groove. An old dental pick is ideal for this.

5) Replace with 5mmØ x 1.50mm “O” ring only. A 1.25mm or 1.75 ring will not work. Kit not available from MB agent – must be synthetic so a bearing/oil seal store is your best source. (Tip - push ring sideways into bore first and roll it into groove with 2mm rod)

6) Remove pipe fittings and valves to clean thoroughly.

7) Re-assemble making new gasket if necessary.

Time? ± one hour.

Have a nice day
Question Concerning the size of the O-ring.
I have a box of O-rings and they list the sizes as mm ID xmm OD xmm w (width). Example: 6mmx10mmx2mm

I am guessing that the O-ring you are speaking of is 5mmx?mmx1.5mm
Do you know the missing dimension? Do you think the OD is 8mm?
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  #8  
Old 09-24-2009, 05:35 AM
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Quote:
Originally Posted by Diesel911 View Post
Question Concerning the size of the O-ring.
I have a box of O-rings and they list the sizes as mm ID xmm OD xmm w (width). Example: 6mmx10mmx2mm

I am guessing that the O-ring you are speaking of is 5mmx?mmx1.5mm
Do you know the missing dimension? Do you think the OD is 8mm?
An “O-ring” is always deemed to be a seal with round cross-section. The correct notation when ordering is – inside Ø x width (i.e. cross-section Ø), O/D is never quoted. In this case simply “O-ring 5mm x 1.5mm”. Obviously the O/D is going to be I/D + 2 x width. To quote “5mm x 8mm x 1.5mm” would denote a square cross section seal.
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  #9  
Old 10-09-2009, 01:50 PM
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Location: The Alamo City, TEXAS
Posts: 1,189
was the original thread posted by Beagle deleted for some reason?

__________________

Current Mercedes
1979 maple yellow 240D 4-speed


Gone and fondly remembered:
1980 orient red 240D 4-speed

Gone and NOT fondly remembered:
1982 Chna Blue 300TD

Other car in the stable:
2013 VW Jetta Sportwagen TDI / 6-speed MT
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