1976 250c Head Gasket Replacement - Mercedes-Benz Forum

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post #1 of 31 (permalink) Old 11-20-2010, 09:02 PM Thread Starter
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1976 250c Head Gasket Replacement

Hi everyone
I own a 1976 Mercedes 250c. It has the 2.8ltr engine and it needs the head gasket replaced.
I am about to tackle the job myself but before I start I thought I would ask around and see if anyone has had any experience replacing the gasket.
I have searched the forum but can't find anything related to the topic.
It would be fantastic if anyone could help me out with any advice or techniques that will make the replacement go smoothly.

Thanks
Callum
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post #2 of 31 (permalink) Old 11-21-2010, 05:28 AM
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Replacing the head gasket on the M110 is not for the faint of heart. What is your mechanical expertise? I would rate this as a 8 on a 1-10 scale. Lots and lots of fiddly stuff is involved. The cylinder head is actually 2 pieces. The cam assembly and the head itself. Figure on a full 8 - 12 hours of work if all goes well.

I would spread it out over a couple of weekends. Pull the head the first weekend, send it off to the machine shop, and spend a couple of hours during the week cleaning the deck surface, cam tower, manifolds' mating surfaces, engine block and whatever else.

Now would be a good time to replace the short hose between the thermostat housing and the lower coolant port and the heater hoses.
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post #3 of 31 (permalink) Old 11-22-2010, 12:31 AM Thread Starter
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Hi there
I have removed the rocker cover, manifold and all the head bolts but I am having trouble removing the cam chain. Is there a simple procedure to separate it from the head? I have loosened the top sprocket that is connected to the cam in the hope there would be enough give in the chain to be able to slide the sprocket off and remove the chain but there is not. Can you point me in the right direction? This is the first time I have worked on these engines so any help would be appreciated.
Thanks
Callum
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post #4 of 31 (permalink) Old 11-22-2010, 12:52 AM
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It totally depends on your mechanical skills--A Haynes manual will help but it is not easy. If you do it be sure to measure the length of your head bolts and if you have oil in the coolant all hoses must be replaced
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post #5 of 31 (permalink) Old 11-22-2010, 04:16 AM
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Replace the collant bypass hose while the head is off.

You really need a service manual for this.

Mercedes-Benz Model 116

select either the 280S or 280SE for carb or FI. The engine section is the portion you want and the instructions will be in there for pulling the head.

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post #6 of 31 (permalink) Old 11-22-2010, 05:12 AM
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Depending on the condition of your engine mounts there is a way to remove the sprocket without breaking the chain.

At the rear of the right side cam tower (exhaust side) there is a triangular plate. It is held with 3 bolts. Remove the bolts and the plate. The cam will slide back and allow the gear to come free.

The odds are you will need to break the chain which is faster anyway.
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post #7 of 31 (permalink) Old 11-22-2010, 08:22 AM
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Originally Posted by murph101 View Post
Hi there
I have removed the rocker cover, manifold and all the head bolts but I am having trouble removing the cam chain. Is there a simple procedure to separate it from the head? I have loosened the top sprocket that is connected to the cam in the hope there would be enough give in the chain to be able to slide the sprocket off and remove the chain but there is not. Can you point me in the right direction? This is the first time I have worked on these engines so any help would be appreciated.
Thanks
Callum

You need to remove the master link in the chain. It is very hard to find because it has 2 very small "c" clips at the back of the chain that hold it on. You need to turn the engine slowly to locate the "c" clips. Be very careful when removing the "c" clips because they are small and if they get away from you, you will never find them.

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post #8 of 31 (permalink) Old 11-22-2010, 01:43 PM
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Quote:
Originally Posted by murph101 View Post
I own a 1976 Mercedes 250c. It has the 2.8ltr engine and it needs the head gasket replaced.
...1976... are you sure you don't mean a 280 C? A 250 C has a 2.8 liter M130 engine, a 280 C would have a twin-cam 2.8 liter M110 engine I think...

Currently: 1967 250 SL, 1963 220Sb, 1965 300SE Lang, 1971 280SE parts car, 1972 Alfa GTV, 1965 Alfa Duetto, 1993 BMW R100R
Past: 1971 250 C, 1985 300 TD, 1967 250 S, 1968 280 S,1981 300 D, 1982 280CE, 3 Facel Vegas, Borgward Isabella Coupe, Alfa 2600 Sprint, Volvo P1900 (yes), numerous less interesting Volvos, ...
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post #9 of 31 (permalink) Old 11-22-2010, 09:30 PM
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Originally Posted by rudedude View Post
You need to remove the master link in the chain. It is very hard to find because it has 2 very small "c" clips at the back of the chain that hold it on. You need to turn the engine slowly to locate the "c" clips. Be very careful when removing the "c" clips because they are small and if they get away from you, you will never find them.
That assumes the chain has been replaced at least once. The 6 cyl's have a shorter chain that the 8 cyls and don't need to be replaced as often.

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post #10 of 31 (permalink) Old 11-22-2010, 11:23 PM Thread Starter
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The car has the M130 single cam engine in it
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