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Engine Rebuild - lower end bearings

posted by  Will740turbo on  Thu Jul 30 17:23 CST 2020
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last visit: Wed Oct 22 16:09 CST 2014
[RELATED]

Hey, thanks to you and Volvo from Heck for responding.

I re-measured them yesterday, and they all measure just a little smaller than 0.002" on the red plastigage. I will re-measure with green plastigage.

The trick is to shim the connecting rod so it can't move side to side (axially, along the long axis of the crankshaft) when you torque the rod bolts. There is a lot more axial clearance (like 2-3mm vs <1mm) on the low-friction later b2x0 engines than b2x engines. I'm not sure about early b2x0 engines.

The range for rod bearing radial (from the perspective of the crankshaft) clearance is 0.0009-0.0026. I'm still trying to find the "color code", which is apparently on the edge of the bearing shell. I don't have a micrometer.


I am getting tempted to take the whole thing to a machine shop to get the bores cleaned up and things measured - it would be cheaper than buying all the micrometers and and a dingleberry hone.


Cheers





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