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Old 08-16-2007, 01:15 PM
Andy_M's Avatar
Andy_M
 
Join Date: Jul 2007
Location: Northwest NJ
Posts: 132
Pulling M103 head - any tips,warnings,ect. ?

I will be pulling the head off my '90 300E's M103 engine this weekend for a valve job. Are there any tips, pitfalls, "be careful's", etc. to know about? For example I have seen these for the M104, do they apply to the M103 as well? (especially #5 and #7):

1) a good time to replace the chain/tensioner also
2) always replace head bolts
3) replace the egr pipe
4) Watch the dowel pins for the intake. They often fall out during removal
5) "..no matter what anyone says, be sure and use a head gasket from MB. They have added Stainless inserts into the gasket at the front areas that leak. AND that special gasket is make only by ELRING!!"
6) If your lower timing cover is leaking now is the time to reseal. Make sure you clean the timing cover and block very well and use the gray permatex not the cheap red sealant .
7) "I have been called to a couple of general repair shops to diagnose broken cams after the work is completed. It turns out that many people are not aware of the fact the chain tensioner has to be run all the way through and re introduced through the closing plug. The chain just sings with the tensioner is ratcheted all the way forward."

Thanks guys,
Andy
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