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Old 02-05-2003, 11:54 PM
stroked 1/2 dzn's Avatar
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Join Date: Nov 2002
Location: Houston
Posts: 43
Name the bad stuff about the M104 I6 motor

I know the gaskets leak, but are there any other bad things to really say about the M104 lineup??? I'm new to the Benz game & that is the motor that gets me to work & school. I dont like bummin rides!
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Old 02-06-2003, 07:23 AM
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Join Date: Feb 2002
Location: Virginia
Posts: 550
Hmm... the only across the board issue I can think of is the wiring harness. The ones through about 1995 had bad insulation, and would often fail prematurely creating a huge variety of symptoms. Many of these were changed under warranty. I've seen some reports of leaking from the head gasket, but that was really more of an M103 problem. That's what I recall FWIW - 'course I don't have one, so maybe someone w/ personal experience will help.

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Old 02-06-2003, 07:33 AM
it leaks, its german
Join Date: Mar 2002
Location: raleigh nc
Posts: 1,111
Engine wiring harness, Upper timing cover leaks, front crank seal leaks, Every now and then main oil pan leaks. Overall, damn near bulletproof mill.

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Old 02-06-2003, 10:40 AM
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Join Date: Apr 2001
Location: Dallas/Fort-Worth
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I agree...engine is nearly's the ancillary components that give you headaches!

The radiator will crack at the inlet neck at around 100K.

You already know about the head gasket problem. It's a problem for BOTH the M103 & M104, just the failure symptoms are different. Oil leaking at the front is the timing cover seal, at the rear, it's the head gasket.

Water pump, alternator, and other parts depend on usage and conditions, but they will go belly up eventually.

Loud clanking sound at idle? Connecting rod? No. More like a worn bushing on the belt tensioner shock.

Loud grinding sound at startup? Bearings going bad on the air pump. The bearings are (of course) not a readily-available size, so total replacement is necessary.

The OVP relay is the source of all sorts of weird idle and starting problems. If yours is original, be prepared.
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Old 02-06-2003, 11:20 AM
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Fan bearing about 200,000 miles goes bad also.
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Old 02-06-2003, 12:50 PM
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Join Date: Sep 1999
Location: Toronto, Ontario
Posts: 210
Bulletproof my butt.

My M104 AMG engine had to have it's heads resurfaced at 90,000 Kilometers.

I don't drive aggressively either.
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Old 02-06-2003, 03:42 PM
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Join Date: Sep 2000
Location: Sherman Oaks, CA
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the wiring harness isuue only affects late 1992 -1995 m104's from what I know.

Other than that, head gasket is the only other issue I know about.

Haven't heard of any leaking elsewhere.

Mines at 103k no leaks, no harness problems. My car was made aug 1991 though, but is a 92 model year.

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Old 02-06-2003, 04:30 PM
Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,503
The wiring harnesses are bad from '93 to '95.

The original head gaskets were poorly designed, and the new head gaskets have steel inserts and don't leak.

Other than that, there are really no major complaints.
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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Old 02-06-2003, 04:41 PM
Posts: n/a
My 92 400SE has been fairly good up to now, 128000 k miles, I had all the wiring harness replaced a couple of years ago when it got fried, but since then I have the ac/heater blower going slow, the window motor dead, window regulator dead, power antenna dead, a couple of door vacuum? don't work, besides that it is a pretty nice car.

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