New Old Stock Engine Rebore Kit for John Deere 420,  430, and 440 Tractors.

Standard bore is 4-1/4" inch.

This rebore kit is for engines that have been overbored 0.045".

The (3) compression rings are 3/32" inch thick for each piston.

The (1) oil ring is 1/4" inch thick for each piston.

Wrist pins and clips are included for each piston.

This rebore kit was produced by Gould Engine Parts Division.  These kits are new old stock from a dealership liquidation.  They were produced in the 1970's.

We would recommend careful inspection and cleaning the kits before installation due to age.

John Deere and aftermarket part numbers: AP139,  AP139-45,  RKA1277,  RKA1277-45,  SP139,  SP139-45.

Please carefully verify your engine's piston bore diameter to ensure you order the correct piston rebore kit.