The Multiquip 71429522570 Ring Set OS=0.50 is a genuine OEM piston ring set designed for L48N6 and MTX-85DY series equipment. As a factory-sourced component, this ring set is manufactured to the exact oversize specification required for engines that have been bored to the 0.50mm oversize dimension. Compatible with the Yanmar L48N6 engine as fitted to the MTX-85DY rammer, it restores proper compression and oil control to a rebuilt or re-bored engine. Keep this part number on hand whenever a top-end engine rebuild is on the schedule for these machines.
Key Features
- Correct Oversize Specification — Manufactured to the OS=0.50 oversize dimension, ensuring proper ring-to-bore clearance in engines machined to this specification.
- Genuine OEM Component — Sourced directly from Multiquip, this ring set meets the same material grade and tension tolerances as the original rings installed at the factory.
- Confirmed Fitment — Verified for the Yanmar L48N6 engine as used in the MTX-85DY rammer; matches the correct bore size and ring groove dimensions for a drop-in engine rebuild.
- Compression and Oil Control Restoration — Worn or broken piston rings cause blow-by, oil consumption, and loss of power; a correctly sized ring set restores the compression seal and controls oil film on the cylinder wall.
- Rebuild-Ready Packaging — Supplied as a complete ring set, giving you everything needed for a single-cylinder oversize rebuild without sourcing rings individually.
Piston rings form the dynamic seal between the piston and the cylinder wall, performing two critical jobs: maintaining combustion pressure above the piston and controlling the thin film of oil that lubricates the cylinder. When rings wear, break, or lose tension, combustion gases leak past the piston — a condition known as blow-by — causing hard starting, loss of power, increased oil consumption, and fouled exhaust. The OS=0.50 designation means these rings are sized for a cylinder that has been bored 0.50mm over the standard dimension, as is common practice when reconditioning an engine with a scored or worn bore. Installing the correct oversize set ensures the rings seat properly against the freshly machined wall, restoring the engine to full operating performance.
Part Details
| Part Number | 71429522570 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Ring Set OS=0.50 |
Compatibility & Fitment
| Name | Model |
|---|---|
| L48N6 | L48N6 |
| MTX-85DY | MTX-85DY |
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.
