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Old 04-16-2021, 03:25 PM   #46
johnneilson
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Default Re: The new Burtz Mosel A engine

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Just a couple random thoughts, the CB-745P is a direct cross to the 2020 it should make no difference unless incorrect or damaged.
Never assemble bearings and crank without oil. I use 90wt gear oil to check fit crank and then assembly lube on final assembly.

Make sure to clean the outside of bearing shell with solvent or acetone, you want no oil here in between bearing and bore. Same again for the bores in the block, absolutely clean. This is more for verifying no debris or dirt.

This is a newly machined assembly of parts, therefore some sense of investigation must be done upon assembly. Main and Rod bearings have a couple different places that can bind, diameter out of spec, width issue and fillet interference and the tangs.

I am sure the diameters are good, easy to verify though with the correct tools.
The crank has rolled fillets, I seriously doubt this is an issue, but could be.
The Tangs may not be cut deep enough, this again is easy to diagnose, assemble the bearing shells into the bores without the crank in place. You will see light under the shell once clamped in place. use flashlight on backside to illuminate.
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