How to tighten the head bolts - Mercedes-Benz Forum

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post #1 of 11 (permalink) Old 09-24-2007, 09:37 AM Thread Starter
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How to tighten the head bolts

My 300e 2.8 has a pretty bad external oil leak from the rear of the engine. I want to see if it can be fixed by re-torque the head bolts. How can I reach the head bolts? If I remove the valve cover, will I see the the head bolts? Or, do I have to take the whole head unit out? Just want to see how big a job it is. Thanks.

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post #2 of 11 (permalink) Old 09-24-2007, 09:42 AM
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Remove the cam cover and the big head bolts are there for the world to see.

Good Luck,

Jayare
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post #3 of 11 (permalink) Old 09-24-2007, 10:25 AM Thread Starter
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Remove the cam cover and the big head bolts are there for the world to see.

Good Luck,

Jayare
I don't know much about the engine. Stupid question here. Is the cam cover = valve cover? I borrow a photo from Mercedeshop below. Can I see the head bolts from this photo or I have to remove more parts?

[IMG]http://www.*****************/diy/m104headgasket/100345_4.jpg[/IMG]

Also, do we need special Mercedes tool to tighten the head bolts?

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post #4 of 11 (permalink) Old 09-24-2007, 11:02 AM
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You have what is called an overhead cam engine design vs. overhead valve design engine. Hence, Cam covers -- Valve covers.

You do not need any special Mercedes tool, but it would be very, very wise to have a torque wrench and know what the torque settings are for the head bolts.

Good Luck,

Jayare
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post #5 of 11 (permalink) Old 09-24-2007, 11:10 AM
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Wiki,

Are you sure that the oil leak is coming from between the head and the cylinder block and not just a bad over tightened cam cover gasket? If I were you, I'd clean the area with something like spray brake cleaner and see where the leak is actually coming from.

Good Luck,

Jayare
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post #6 of 11 (permalink) Old 09-24-2007, 09:38 PM Thread Starter
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I used oil leak dye to locate the leak which is near the lower back of the engine. The oil leaks between the lower block and the cylinder block.

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post #7 of 11 (permalink) Old 09-25-2007, 05:28 AM
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I don't know exactly why but I read in another list that it is NOT adviseable to re-tighten the head bolts. If you still decide to do it; MAKE SURE you do use a calibrated torque wrench.

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post #8 of 11 (permalink) Old 09-25-2007, 05:50 AM
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Re-torque the head bolts? your living in the wrong world. Try changing the head gasket
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post #9 of 11 (permalink) Old 09-25-2007, 11:14 AM Thread Starter
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I read from another thread that one guy fixed the same oil leak after re-torque the head bolts. If it's easy to do diy, I want to try it. I know replacing the head gasket is the long term solution but that's at least $1500. I still can't believe Mercedes cannot make good head gaskets after all these years of automotive engineering.

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post #10 of 11 (permalink) Old 09-25-2007, 11:27 AM
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Quote:
Originally Posted by bigwiki View Post
I still can't believe Mercedes cannot make good head gaskets after all these years of automotive engineering.
My wife's '99 ML430 has over 100K miles and no oil leaks. I think MB knows how...

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