Does anyone have the engine specs - clearances, etc, for my '72 250 M130 engine? I am replacing the main and connecting rod bearings, new piston rings, and I need clearances etc.

Ryan

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RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE

According to my antique Chiltons, main brg journal dia is 59.955-59.965 mm
oil clearance 0.045-0.065 mm. Rod brg journal dia is 47.955-47.965 mm oil clearance is 0.035-0.055 mm.
As far as rings go, buy the set that matches the piston make and dia. But check the bore for ovality and taper before you get too far along. If the bore is out of round or tapered by more than 0.001" you should overbore, or cross your fingers and go with what you have. Also check the side clearance of the ring in its' piston. I'm not sure what it should be, most of my books are packed away. Off the top of my head it should be no more than 0.002" for the top 2 rings.