Home › Forum › Ask A Member › Mercury KG7 Crankshaft, Cylinder Bore, Piston Skirt measurements??? › Reply To: Mercury KG7 Crankshaft, Cylinder Bore, Piston Skirt measurements???
Hard chrome liner ?? There is none. Piston diameters are measured at the wrist pin and you might be able to find oversize ones. Good luck, racers gobbled them up years ago. Typically the cranks don’t wear. Rod journals might gall due to long term storage or moisture intrusion where the needles rust. Even if you refinish a crank how are you gonna figure how many needles to put back in ? Forget it, find another crank. As you know, many models used the same one. If you refurbish a crank, use only 320 grit crocus cloth. The rod journals must have some “tooth” so the needles will roll. Needles will slide on a micro-polished journal and then you lose the crank.
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