The Multiquip 1590121090 Piston Ring Assembly is a genuine OEM component designed for BLW-400SSW, KD1800, KD1800KD6, and KD6 series equipment. As a direct Multiquip OEM part, it is manufactured to the same specifications as the original, ensuring a correct fit in the engine bore without modification. This assembly is a critical internal engine component, and using the correct 1590121090 is essential for maintaining proper compression and long-term engine health. DHS Equipment supplies this part as an authorized Multiquip replacement to help you get your equipment back to full working condition quickly.
Key Features
- Genuine OEM Compression Integrity — Manufactured to original specifications, this piston ring assembly maintains the correct ring gap and tension needed for consistent cylinder compression.
- Direct Engine Bore Fit — Engineered to seat correctly in the piston grooves of compatible engines, allowing straightforward installation during an engine rebuild or top-end service.
- Broad Multiquip Model Coverage — Confirmed fitment for BLW-400SSW, KD1800, KD1800KD6, and KD6 series machines, covering both welder and core drill applications within the Multiquip lineup.
- Restored Engine Output — A worn or broken piston ring causes compression loss, increased oil consumption, and reduced power. Replacing with part 1590121090 restores proper combustion and engine efficiency.
- Complete Assembly — Supplied as a full piston ring assembly, so all rings needed for a single piston are included in one part number, simplifying the ordering and rebuild process.
A piston ring assembly forms the dynamic seal between the piston and the cylinder wall inside an internal combustion engine. The rings serve two primary jobs: holding combustion pressure above the piston to generate power, and scraping excess oil off the cylinder wall to prevent it from burning in the combustion chamber. When these rings wear, crack, or lose tension, compression drops, oil consumption rises, and the engine delivers noticeably less power — symptoms that typically point directly to ring wear as the root cause. Replacing the piston ring assembly with a correct OEM part like the Multiquip 1590121090 restores the tight seal the engine depends on for reliable operation.
Part Details
| Part Number | 1590121090 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Piston Ring Assembly |
Compatibility & Fitment
| Name | Model |
|---|---|
| Welders | BLW-400SSW |
| Core Drills | KD1800 |
| Core Drills | KD1800KD6 |
| Core Drills | KD6 |
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.
