Wiring loom - insulation falling off, water leak, oil leak - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 02-09-2006, 11:49 PM Thread Starter
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Wiring loom - insulation falling off, water leak, oil leak

Help - Just been looking into a small oil leak and small water leak on my 1992 W124 E320.

While looking for the leak I moved some wiring at the front of the engine bay (after removing the black plastic cover on the front of the engine - behind the radiator fan). I guess this is the biodegradable wiring look?? Think it must be as it crumbled in my hands!!!

Has anybody changed this loom or could you recommend a W124 specialist in my area - I live just outside Pontefract in West Yorkshire (UK). I've used Mercedes Wakefield, Leeds and Doncaster with a newer Merc I had but I’m not that impressed. I would rather have an enthusiast / specialist. It's a really good car, I’m the second owner from new and it's done 83k.
Does anybody know the part number for the engine wiring loom?

Back to the oil leak, looking at the car from the front it could be coming from the front left of the engine (under the exhaust manifold). Any ideas?? Just serviced and now running synthetic oil (didn’t notice leak before service, but had it serviced soon after buying)

Water Leak - Water could be coming from the front left of the engine?? Any ideas?

I’m not sure how much oil or water it’s using yet, it's just been serviced and had the water/antifreeze changed (not sure if the water problem could be down to the new antifreeze finding a leak?? the system was flushed and filled as recommended with mb antifreeze.)

There isn’t any water in the oil or oil in the water. It was running like a dream before I touched the engine wiring (used cruise all the time). Just going back out now to temp tape up the wiring and reconnect.

Any thought would help.

Many thanks. Simon.
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post #2 of 4 (permalink) Old 02-10-2006, 05:05 AM
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RE: Wiring loom - insulation falling off, water leak, oil leak

It looks like you need a new engine wire harness, new water pump, and a front cover gasket (or even possibly a head gasket). Get ready to spend big bucks!

'95 E320 163K miles (all the above mentioned repairs done)

'02 ML500
'01 E320 Wagon 4-Matic (R.I.P)
'95 E320 SE (gone)
'99 ML430 (gone)
'94 C280 (R.I.P)
'12 LR4
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post #3 of 4 (permalink) Old 02-10-2006, 09:26 AM
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RE: Wiring loom - insulation falling off, water leak, oil leak

Dunno whats included in this but best be quick and contact the seller...

http://cgi.ebay.co.uk/Mercedes-Benz-124-E-class-job-lot-of-wiring-harnesses_W0QQitemZ4612429551QQcategoryZ10398QQrdZ 1QQcmdZViewItem

What mileage is the car? just guessing about 130k?? If so, headgasket is common problem. In the uk it'll cost close on £1k to get fixed.... unless you DIY.
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post #4 of 4 (permalink) Old 02-10-2006, 10:24 AM
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RE: Wiring loom - insulation falling off, water leak, oil leak

If this car as the same engine as my 90 300E here in the US the water leak if from your water pump. It's the seals inside it and it's probably leaking from the seep hole on below the shaft going into the water pump.

As others mentioned the leak you speak of is fairly common on this engine. I never got mine tended to and I can't remember if it was going to require some new seals on the front of the block or if it was going to require a new head gasket. I'm inclined to think the prior and not the latter. Keeping searching the site as I'm sure there's more info on doing this.

As for the water pump it's kind of a pain to do if you're a DIY type. I blew mine within the first 3 weeks of when I got my 90 300E that had 75K miles on it. I think it was because I was driving the hell out of the car. I had a deisel prior to getting it and thought it was great fun to have a car that could get a 3 gear scratch (burn/spin back tires). Anyway... good luck and welcome to the site.

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