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

The most common problem of a cylinder that needs replacement is in case there are scratches into the surface of the tube where the piston runs.

What other parts I may need to replace on my machine when replacing the piston?

To replace the piston you need to disassemble the engine, so you also need to replace the cylinder gasket, at least. Also, it is recommended to check the piston bearing.

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Piston Kit for McCULLOCH Mac 738, 740, 742, 842 - JONSERED CS2138 [#530071883]

$21.71

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Piston Kit for McCULLOCH Mac 738, 740, 742, 842 - JONSERED CS2138 Chainsaws [#530071883] and related spare parts.

Details

This listing is about a brand new after-market Piston KitHow to find the size of a piston ring for the following machine models, 41.06mm in diameter, and replaces OEM Part #530 07 18-83:

JONSEREDSpare parts for JONSERED machines CS-2138 C (2006-01)

McCullochSpare parts for McCULLOCH machines:

Mac 7-38
Mac 738

Mac 7-40
Mac 740

Mac 7-42
Mac 742

Mac 8-42
Mac 842

This high-performance Piston Kit comes directly from a top-quality ISO-certified Manufacturer.
This top-quality Piston Kit is covered by a 2-year warranty.
No Exporters - No Intermediaries You buy at a competitive price, because we buy directly from the source!

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Specifications

Specifications
Country of Origin	Taiwan
Product Code	1004312
Compatible Brand	McCULLOCH
Compatible Models	McCULLOCH MAC 7-40, MAC 742, MAC 8-42, MAC 842, Mac 738, MAC 7-42, Mac 7-38, MAC 740
OEM Part #	530071883

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