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Old 10-08-1999, 09:58 AM
Coming back from burnout
Join Date: Jun 1999
Location: in the Pacific Northwest
Posts: 2,274
I cant figure out why my old 240D 83 Engine failed--the bearings looked perfect, i dont think it was using oil--no oil film at exhaust manifold, even though oil pressure was low the day of failure.
Because of this I'm wondering what might fail again--is it okay to REUSE Connecting Rod Nuts? The engine that failed had #2 piston's Connecting Rod explode literally through the Block! I'm wondering if nuts failed.
Also when I torqued Head Bolts, two or three of them suddenly turned "TOO EASILY" on the last 90 degree twist--did I strip them? Were they stripped? Should I replace them?
Old 10-08-1999, 04:22 PM
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Join Date: Apr 1999
Location: Cincinnati, OH, USofA
Posts: 135
Any engine I've rebuilt, and most factory manuals you read, always recondition the rods and replace the rod bolts, Pretty much standard fare in reconditioning/rebuilding an engine.

I usually in most cases replace all bolts the are involved in the areas of suspect. Head Bolts and/or studs and nuts, clutch, flywheel, etc.

I would think on a diesel with it's much higher compression that head bolts would be given. Are far as in your case, was the Rod still attached to the Crank? Or did it fail at the bolts? The comment about 2 or 3 bolts turning easily the last 90 degrees, should have been a tip off. I'm wondering at what Torque were they last tight?

You did bring the Torque up 5-10 lbs at a time before the final once around to finish?

What type of torque Wrench were you using? Click, Bar or Dial Indicator type?

Mike Mullins
71 250 Coupe
92 400E Sedan
90 944/S2 Cabriolet
Old 10-08-1999, 07:50 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
All "torque-to-yield" bolts have a wear out factor. The head bolts have a maximun length, & rod bolts have a minimun thickness. Don't take chances Measure!!
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