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Ted Mooney, P.E. RET
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for Metal Finishing 1989-2025
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Electroplating & grinding vs. a piston bush to repair piston
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May 9, 2022
Q. I am repairing my 1934 car; one piston (60 mm bore) is damaged and not/nowhere available ...
The gudgeon pin is a fully floated one.
The gudgeon pin hole (diameter 14.2875mm) in the piston is damaged and can be surface cleaned/cleared out by reaming to 14.5 mm.
What is best thing to do?
(1) Make a new 1.5-2 mm thick bush in the piston (& enlarging the hole to 17.5-18.3mm), or
(2) is an oversized new piston pin and have this ground-chromed-ground to size a better option? (The pin will be weighed and corrected internally), or
(3) is chrome plating another good standard gudgeon pin possible? Is it wise to chrome plate a layer on an existing (good) gudgeon pin and have it ground back to 0.10625 mm thickness, adjusted to the new/clean hole?
Thank you in advance, kind regards
- west woodburn england
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