cylinder head bolt
 

I have 1991 300e 3.0Lt. just need to know where can buy the tool that tighten head bolts down?

Head bolt socket
 

I got mine from samstag sales in Florida I think mine is made by German company called stalwille. It is an xzn or triple square socket. Looks like a torx with 12bumps instead of 6. I seem to remember there is another type of bolt but i do not remember the type of fastener. The Mercedes manual describes measuring the length if the bolts to see if they can be reused. I just bought new ones. Don't remember the torque. I think it was torque all bolts to a certain rating then turning them 90 degrees And then turning them 90 degrees again

head bolt
 

do u know what socket size for the head bolt

Probably m10 or 12. Check the shop manual. Triple squares can be found at NAPA. Don't know your engine, but the sequence & torque method will be in a mercedes FSM or haynes book.

head bolt
 

Thanks guy just need to where to buy that socket and the size.

12mm 12pt torx. I believe NAPA carries these, according to other posts I have read. I own one from Hazet tools, a high quality piece that cost $30+. Search the web! they're easy to find.

These are known as Triple Square / XZN. ( Fixed missing XZN reference per other posts. ) They are not Torx.

Check around, I've gotten them 4" long then a standard socket is used to drive. This can be helpful when castings block the path of a short drive bit.

Head bolt socket
 

Stalwille xzn socket size m 12. It has a Mercedes part number on it it is 617 589 00 10 00. If you are pulling the head you also need a 17 mm hex and a 12 mm hex to remove and reinstall the timing chain tensioner. Check the service manual for procedure for this and for torqueing the head bolts

Thank u

Answer
 

Here is the tool you need.
http://www.peachparts.com/shopforum/general-information/280982-triple-square-tool.html


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I was able to order a set from Sears last year. Available, but not in stock at the store.