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Old 10-05-2006, 01:44 AM
Join Date: Jun 2006
Posts: 552
injector leaking

My mothers car has a leak at the injector base where it screws in to the engine. Can i just tighten it. Does it require a certain torque. RAY M
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Old 10-05-2006, 02:55 AM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,195
Eventually the return hoses get brittle and fuel collects at the base of the injector.

If you're sure fuel is leaking up from the prechambers then you have a compression leak. Get a new heat shield (~$1.50) and torque the injector to 50 lbft. Get an injector socket that fits well or you'll bend the return nipples and you'll have a worse leak.

93 300SD
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Old 10-05-2006, 01:25 PM
carnut's Avatar
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Join Date: Jul 2006
Location: Stockton California
Posts: 637
Before doing anything else, get the light brown return hose from a Mercedes parts dept and replace all of them. I fought this "injector leak" problem for a week and it was defective hoses purchased from an independant parts dept. I went so far as to replace one injector and still had diesel leaking overnight prior to replacing these hoses. Easy to mis diagnose!
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Old 10-05-2006, 04:30 PM
adrenelin500's Avatar
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Join Date: Apr 2006
Location: Newfoundland
Posts: 154
last winter i replaced the injectors on my 300sd , after a day or so i noticed there was fuel around the base of the injectors so i took them out and wrapped the threads with teflon tape and now no leak persists. Btw you can make your own socket if you wish by notching out the socket on opposite sides of each other if you want to save some cash.Its a bit of a time consumer but can easily be done with a grinder.
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Old 10-06-2006, 02:00 AM
Join Date: Jun 2006
Posts: 552

Thanks All. I'll check it all. RAY M
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Old 10-06-2006, 03:04 AM
Jadavis's Avatar
Registered User
Join Date: Oct 2005
Location: Tennessee
Posts: 995
Or replace them with viton.

Orders placed for hose kits now will ship on the 14th. (It is on order.)

1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.
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