I'm about to put together the engine for my '86 300SDL restoration project that has been 5-6 years in the making. The original problem was a connecting rod came loose from the crank and busted two holes in the block. (I bought it this way).

I have the mating connecting rod caps for 5 of the big ends but I need one more. I know in installation it is important to match up each as they came from the factory by matching the scribes, but what about the missing one?

I have some replacements that a forum member sent me, but I don't know how to select the one to use. By what parameters do I use to make this selection? Weight? Measurement?

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Michael LaFleur

'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
'83 Harley Davidson FLTC (Broken again) :-(
'61 Plymouth Valiant - 60k mikes
2004 Papillon (Oliver)
2005 Tzitzu (Griffon)
2009 Welsh Corgi (Buba)