Multiquip 8971412090 Piston Ring Set O/S=0.25 DCA25USI 4LE2

The Multiquip 8971412090 is a genuine OEM Piston Ring Set O/S=0.25 DCA25USI 4LE2 designed for the DCA25USI ultra-silent diesel generator series. This oversize ring set is manufactured to the exact tolerances required by the 4LE2 engine, ensuring proper cylinder wall sealing and correct piston-to-bore fit after a cylinder bore oversize service. As a direct Multiquip OEM part, 8971412090 delivers the dimensional accuracy and material spec your engine rebuild demands.

Key Features

• OEM-Grade Ring Material and Tolerancing — Manufactured to the exact hardness, tension, and profile specifications of the Isuzu 4LE2 engine, ensuring consistent ring seal and controlled oil consumption.
• Correct Oversize Specification — Sized at O/S=0.25 to match a 0.25 mm overbore cylinder, dropping directly into a freshly honed bore without additional fitting work.
• Confirmed Fitment for DCA25USI — Verified for the Multiquip DCA25USI ultra-silent diesel generator equipped with the Isuzu 4LE2 engine.
• Restores Compression and Engine Efficiency — Worn or broken piston rings allow combustion gases to bypass the piston, causing power loss, increased oil consumption, and excessive exhaust smoke; a correctly fitted ring set restores full compression and clean combustion.
• Essential Engine Rebuild Component — Specified for use during cylinder bore oversize service intervals, making this ring set a critical part of any top-end or full engine rebuild on the 4LE2.

Piston rings form the dynamic seal between the piston and the cylinder wall inside the engine. They serve three roles simultaneously: sealing combustion pressure above the piston to maximize power output, controlling the thin film of lubricating oil on the cylinder wall to prevent burning, and transferring heat away from the piston into the cooled cylinder bore. When rings wear, lose tension, or break, compression drops, oil consumption rises sharply, and the engine begins to smoke and run rough. Replacing them with a correctly sized oversize set during a bore service restores the engine to proper operating condition and protects the newly honed cylinder surface from premature wear.

Need help confirming this part fits your machine? Contact the DHS Equipment team for fitment support before ordering.

Part Details

Compatibility & Fitment

Verify Before You Order

Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.

Why Buy From DHS Equipment

Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.

Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.