Bad rod bearing

SAJ, I meant to grind the connecting rod caps with the inserted bearing shells together on a lapping stone. Only some few µm.
 
Werner Yes I was sure you meant that. I was worried someone less knowledgeable would think you were grinding just the insert shells.
If you leave the shells in the caps and surface them on a stone, you will remove the protrusion of the shells and the crush which is important for tightness and bearing shape. That is why I stoned the caps without the shells in place. I could have then removed 0.0005 inch from the shells to retain the same crush, but did not bother. So my bearings have a very slightly bigger lemon shape than before I resurfaced the caps.
SAJ in NZ
 
Wunderschönen guten Abend!

Since the day before yesterday my machine has been running again with the new piston rings and the inserted connecting rods.

Yesterday I drove 40 carefully miles with less than 40 mph. The motor now runs as quiete like a freshly oiled sewing machine.

I would like to thank now all the helpers here who supported me with advices!


Info: The new 'imported connecting rods' with inserts weight 775 grams. The old ones with babbits 720 g. The weight difference are only 5 grams.
 
N'Abend!


After now 430 slow (max. 40 ml / h) running-in miles today I measured the warm engine compression. 70 PSI at all cylinders - it's looking good!
 

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