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Old 07-04-2003, 11:27 AM
Registered User
Join Date: Oct 2000
Location: oakland ca usa
Posts: 126
1992 300Ce cylinder head torque...techs please help

Hello...I am installing the cylinder head that I just got back from the machine shop for a valve job/guides/surfacing etc. My W124 book for my M104 24 valve engine says that in torquing the head to do the following..
1.Torque all head bolts(14) to 55Nm
2.Using a wrench turn...tighten head bolts 1 to 10.. 90 degrees
3.using a wrench turn...tighten head bolts 1 to 10.. 90 degrees
Is this correct? Are they saying that head bolts 11 to 14 stay at the original torque value in step 1?? Please advise/help!

Also what is the correct way to adjust the timing chain tensioner?
When I installed it the chain is VERY tight.What is the correct way to adjust the allen head?
Hopefully a tech or techs that have done this job task can provide me with a answer.Im hoping to get it running this weekend.
Thanks for your time
1999 C43
1992 300Ce
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Old 07-04-2003, 05:44 PM
MRPerformance's Avatar
Registered User
Join Date: May 2003
Posts: 24

The 124 Service CD gives the following steps for tightening the head bolts:

Measure all bolts to insure they are less than 163.5 mm long.

Clean and dry bolt holes.

Lubricate bolt threads and washers with motor oil.

Torque in following stages (ALL head bolts):
1) 55 nm
2) 90 degrees
3) 90 degrees

I suspect the "1-10" in your book is a misprint.

I'm not sure what you mean by adjust the timing chain tensioner-- it's self adjusting. However, you need to disassemble the tensioner before reinstalling it so as to prevent the plunger from being hyperextended. Install the tensioner housing to 80 nm of torque. Then install the plunger (you may need to tap it into place with a suitable drift/punch), spring and spring filler thing-a-ma-jig before installing the Allen head plug to 40 nm of torque. MB specifies using new sealing washers on the tensioner housing and Allen head plug.

Also note that certain of the cam sprocket attaching bolts (there are several variations of these) are stretch bolts and should not be reused!


'93 190E 2.6 Sportline
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Old 07-05-2003, 12:27 AM
Registered User
Join Date: Oct 2000
Location: oakland ca usa
Posts: 126
300Ce head torque

Mike..thanks a zillion for the response,very much appreciated. I will go by what your book says.
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