How can I determine whether my piston is reusable so as to replace just the piston rings?

The most common problem of a piston that needs replacement is in case there are scratches on its body.

What other parts I may need to replace when replacing the piston rings?

To replace the piston rings you need to disassemble the engine, so you also need to replace the cylinder gasket.

$7.17

In stock

Piston Ring fit ZENOAH-KOMATSU AG431, AG4300, BC431, BC4301, EB430, EB440, G45L, MD431 [#140041220] and related spare parts.

This listing is about an after-market top-quality Piston RingTips for safely installing piston rings made by the well-known OEM firm CABER which replaces OEM Part #1400-41220, and fits the following ZENOAH-KOMATSUSpare Parts for ZENOAH-KOMATSU machines models:

Specifications
Country of Origin	Italy
Product Code	1007942
Compatible Brand	ZENOAH-KOMATSU
Compatible Models	ZENOAH-KOMATSU EB440, EB430, G45L, MD431M, AG4300, BC4301, AG431, MD431A, BC431, MD431D
OEM Part #	140041220