Komatsu Part PISTON RING ASS 6261-31-2040

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Product Overview

The 6261-31-2040 PISTON RING ASS is a genuine Komatsu OEM replacement piston ring assembly. Piston rings are installed in the grooves around an engine or compressor piston — they seal the combustion or compression chamber against the cylinder wall, control oil consumption, and transfer heat from the piston to the cylinder wall for cooling.

Part Number: 6261-31-2040 Part Name: PISTON RING ASS Part Type: OEM Komatsu Replacement Engine Component Availability: In stock

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When to Replace

• The engine consumes excessive oil — blue smoke from the exhaust indicates oil passing the rings
• Compression is low on one or more cylinders — measured with a compression tester
• Power is reduced and oil consumption is high — the rings are not sealing
• The engine is being rebuilt — piston rings should always be replaced during overhaul
• The cylinder wall shows scoring — damaged rings can cause cylinder wear

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Installation

1. Confirm 6261-31-2040 in your Komatsu parts catalog
2. Clean the piston ring grooves — carbon and debris must be completely removed
3. Check the ring end gap in the cylinder bore — must be within specification
4. Install rings in the correct order and orientation — note the top mark on each ring
5. Stagger the ring end gaps around the piston circumference
6. Use a ring compressor to install the piston into the cylinder

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Request a Quote

Need the Komatsu 6261-31-2040 PISTON RING ASS? Contact us through the form or by phone, email, or WhatsApp. We respond within one business day.