Author Topic: Oil Leak on Fuel Shut-Off Solenoid  (Read 3632 times)

Charles 230SL

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Oil Leak on Fuel Shut-Off Solenoid
« on: July 14, 2014, 12:44:31 »
Hello all,
I have an early injection pump (S6KL70/120R11) with a significant oil leak that appears to be coming from the shut-off solenoid. Looks like oil is seeping from around the black end cap near the terminals. Solenoid part no. is (Bosch) 0330 101 009. I've read on this Forum where others have experienced the same oil leak but I've yet to find out where they got a replacement solenoid. Before I remove the solenoid, does anyone know where to get new one? I've searched the part number several times with no luck.

Has there been a part number revision? Can the solenoid be disassembled and resealed?  thanks, Charles

ja17

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Re: Oil Leak on Fuel Shut-Off Solenoid
« Reply #1 on: July 15, 2014, 13:32:03 »
Charles, make sure the oil level in the IP is not too high.
Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1982 300TD Wagon turbo 4spd.
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
1998 E430
1974 450SLC Rally
1965 220SE Finback

wwheeler

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Re: Oil Leak on Fuel Shut-Off Solenoid
« Reply #2 on: July 17, 2014, 20:53:38 »
Charles,

That happened on my '68 W111 solenoid. Mine is a later pump with the fed oil. The solenoid had a slime coming off the cap slowly forming a drip. Not a big deal but bothered me.

I bought a used solenoid from Pacific Fuel and it resolved the issue. Not sure if he has any more.

You will also need the gasket for the solenoid to the pump body. Some of the new replacements are too hard and the leak will be worse than what you have now. I used 1/32" 80 shore A Nitrile (NBR) rubber sheet and made my own gasket. Dry as a bone. Old gaskets are good to use as long as you don't ruin them when removing. Rubber sheet can be bought from McMaster Carr. 
Wallace
Texas
'68 280SE W111 coupe
'60 220SE W128 coupe
'70 Plymouth Roadrunner 440+6

Charles 230SL

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Re: Oil Leak on Fuel Shut-Off Solenoid
« Reply #3 on: July 17, 2014, 21:53:43 »
thanks for your help,
I just checked the IP oil level and found it way too high - I'll siphon off the excess and see if that resolves the leak. If not, I'll contact Pacific Fuel and inquire about a used solenoid. thanks again, Charles