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Old 02-03-2008, 09:39 AM
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Join Date: Nov 2007
Posts: 54
I cleaned the plastic oil pan undershield...

yesterday to keep an eye on what might be leaking. Since I've bought the car, I've fixed 2 minor coolant leaks and am looking at replacing 2 power steering return lines soon (both are rotting).

I took out the pan and used a plastic putty knife to literally scrape the accumlutated gunk off the pan. Now, I'll know a fresh leak as opposed to guessing what or if something is leaking.

While underneath the engine, I saw what appeared to be a leaking freeze plug (slight seepage). If indeed this is the cause of a leak, how would I go about repairing it? Thanks!

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I cleaned the plastic oil pan undershield...-engine-block-leak.jpg  
1987 300e "200,000+ and going strong"
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Old 02-03-2008, 09:48 AM
t walgamuth's Avatar
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 35,941
That looks like a pipe threaded fitting. Remove, clean the threads with a wire brush and reinstall with plumber's pipe dope. Probably teflon would be best. When reinstalling give it plenty of torque, it will take more than you think.

Tom W
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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Old 02-03-2008, 10:32 AM
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Join Date: Apr 2006
Location: Aiken, SC
Posts: 204
That looks like the block drain plug on my M111. You could try to just tighten it. Or, remove it as tom suggests, clean it and then re install. I'm not sure what the plug seats against to seal, not sure if teflon would seal it or not.
2000 C230 Kompressor "Frosty"

2007 PT Cruiser
2001 VW TDI Beetle
1999 Landrover Discovery II
1971 Corvette

Gone: 97 Cabrio, 83 240D, 93 VW Eurovan, 95 Volvo 850, 93 Chevy Astro Van, 77 VW Bus, 99 VW Jetta, 74 VW Bus
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Old 02-03-2008, 12:41 PM
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Join Date: Oct 2004
Location: Baton Rouge La
Posts: 2,631
in the 124, you just unscrew them and screw them back in... i guess teflon wouldn't hurt...
1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k

1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it

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Old 02-03-2008, 12:50 PM
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Join Date: Oct 2005
Posts: 4,263
It should be a metal-on-metal seal. Teflon tape won't help at all.
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Old 02-04-2008, 07:14 AM
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Join Date: Aug 2002
Location: Southeastern PA
Posts: 3,043
That's the engine block coolant drain plug ... tighten it. If you loosen it you're going to drain all the coolant from the engine block. When/if you want to drain coolant from the engine block use a piece of clear tubing over the plug to a bottle/drain pan ... prevents a wet mess under the car.

Fred Hoelzle
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