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Old 09-01-2012, 09:26 PM
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Location: fairfax,ca.
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injector pump seals and bio

will bio accelerate breakdown of the seals in injector pump in my 80sd

95 e320,87 sdl,79 300sd
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Old 09-01-2012, 09:34 PM
John Schroader's Avatar
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Join Date: Jan 2007
Location: Kentucky
Posts: 405
I have read on this and other threads that it might accelerate the breakdown of injector seals. My experience is that, after 55K miles on B100, my 300D is purring along without any injector problems.
John Schroader
bio burnin' 83 300D, '83 300 SD, '79 240D
"I've never met a man who was good at making excuses who was good at anything else" Ben Franklin
"You cannot permanently help a man by doing for him what he could and should do for himself" Abraham Lincoln
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Old 09-02-2012, 08:57 AM
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Join Date: Aug 2011
Location: Carolina
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Current fleet
1992 300D "IceBerg"
1984 300D "Blues Mobile"

1978 300CD "El Toro" Gone on to be born again
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Old 09-03-2012, 09:52 PM
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i dont understand why not?.they are made of rubber
95 e320,87 sdl,79 300sd
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Old 10-10-2012, 04:47 PM
daw_two's Avatar
diesel enthusiast
Join Date: Jan 2007
Location: Germantown, TN
Posts: 5,438
seals will break down......eventually

If your 1980 300SD injection pump has the original rubber seals in it, I expect that with time, you car will be capable of making a sizeable mark when parked for a week.

Here's what Coda did before I re-sealed the injection pump during a 9 day trip:
Coda, 1986 300SDL, the journey continues........
Germantown, TN

Current Car --- 05/2012 1984 300D Light Ivory, Red interior
Cluster Needles Paint
New Old Stock (NOS) parts

3/2008 1986 300SDL "Coda"
04/2010 1965 190D(c) "Ben"
& many more
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Old 12-04-2012, 07:32 PM
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Join Date: May 2007
Location: florida
Posts: 677
I think it will make a big difference if you are talking real properly processed Bio-diesel fuel or as seems to be happening alot lately using waste vegtable oil and mistakenly calling it bio-diesel.Also what percentage of BD you use,if you are planning to use the most commonly available commercially processed will be about 20% bio and will not likely cause any leaks that were not going to leak sooner or later anyway.If you are going to be running 100% i would change the delivery valve seals and the fuel hose as a precaution and be prepared to clean the fuel tank before using it or plan to change some fuel filters and have some in the car at all times until the bio cleans the tank and plugs the filters as iy WILL clean the tank. Don
Red Green "This is only temporary,Unless it works!"

97 E300D 157000 miles
87 300TD ?141k? miles
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Old 12-04-2012, 10:36 PM
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Join Date: Mar 2009
Location: San Diego
Posts: 3,050
I am not sure there is any rubber o-ring in the 617 engine's IP. OM60x, definitely, in many years.

Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details.

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.
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