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#1
03-11-2009, 05:54 PM
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What does this bolt do?
While I had the radiator out I started cleaning the accumulated crud off the front of the engine and found this under 1/4 inch of black gunk.
It is in the upper block just below the valve cover right of center. Is it a drain plug?
__________________
1981 240D 143k 4 spd manual -SOLD 2004 VW Jetta TDI 5 speed 300k -still driven daily 
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#2
03-11-2009, 06:13 PM
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I think its an access port to an oil gallery, common source of seeping oil that contributes to the accumulation of sludge you cleaned off. Keep an eye on it and DON'T remove it with the engine running.
__________________
1983 CD 1958 Studebaker Packard (being resuscitated)
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#3
03-11-2009, 06:19 PM
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guide rail pin access port
Quote:
Picture attached Last edited by whunter; 03-12-2009 at 03:03 AM. Reason: incomplete answer, must slow down
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#4
03-11-2009, 06:45 PM
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I dont think the location of this plug is anywhere near the timing chain. I also believe it is access to the oil gallery.
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#5
03-11-2009, 08:38 PM
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Behind the plug is the idler sprocket pivot pin...hollow,but not pressure-lubricated.
Is there any special reason MB always put MoCr on the heads,I wonder...
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