Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help

Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 09-27-2006, 06:39 AM
Vronsky's Avatar
Enemy combatant
Join Date: Jul 2002
Location: Amsterdam, Old Europe
Posts: 841
Headgasket failure on M111 engine...

Car idles badly for ca. 20 sec. right after starting (both cold & warm), and lately the coolant level indicator light goes on and off at times. MB dealer now says the headgasket leaks coolant into one of the cilinders. 1996 M111 engine has done 140K miles.

I'm looking at a repair of 1100 Euro.

Is it likely their diagnosis could be wrong?? My understanding is that headgasket probs on M111's are very very rare.

2011 Prius
Reply With Quote
Old 09-27-2006, 04:47 PM
Registered User
Join Date: Dec 1999
Location: Utrecht, the Netherlands
Posts: 363
If the head gasket is leaking it is possible that water get into a cylinder.

The most common symptoms are:
1- very hard first crank after the engine was not running for a while (overnight).
2- Large amounts of white smoke from exhaust
3- Water in the oil (oil level rising)

If your car is just idling bad for 20 sec I would recommend further diagnosis before you have the engine taken apart.

You state that the coolant indicator comes on sometimes, do you add coolant or just wait for it to go off again?
Reply With Quote
Old 09-27-2006, 08:46 PM
Registered User
Join Date: Sep 2006
Posts: 6
Do a compression test.That will tell you for sure if you got a leak.Also check the sparkplugs.They are the best insight to how a car is operating.If 1 of them is fouled then you know something is up with that cylinder.Good luck.
Reply With Quote
Old 09-28-2006, 02:47 AM
Vronsky's Avatar
Enemy combatant
Join Date: Jul 2002
Location: Amsterdam, Old Europe
Posts: 841
No white smoke, easy starting at all times. Just the bad idle.
Fluid in expansion tank was clear. Didn't check oil.
Dealer says they did a compression test, and had to add 1,5 litre coolant (never added fresh fluid myself).
They are certain it's the headgasket.
Still don't understand why the coolant light went on and off (should stay permanently on, I'd say).

Indy garage offered a cheaper price, but I'm thinking that for these type of complicated jobs, the MB dealer is still the right place (& 2-year warranty on repair). They're also renewing the valve stem seals while the head's off.

The M102 engine in my previous W124 also had a headgasket failure, aswell as a worn diff btw, that on my W210 is now also becoming audible
2011 Prius
Reply With Quote
Old 09-28-2006, 08:00 AM
t walgamuth's Avatar
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 32,702
the low coolant light is probably a simple float like in a toilet tank. when your coolant is cold it occupies less space as it shrinks. hence may indicate a low level. when it warms up it expands so no indication. it may also be located in a place where cornering or braking might affect coolant level at the indicator float.

good luck. hope it is not the head gasket but it sounds like a good chance it is. i am not sure a compression test would always be a good indicator. of this.

also you may experience bubbles and excess pressure in the cooling system.

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. It still needs upholstery redone...I also have a 427 Cobra replica with an aluminum chassis.
Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 06:16 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page