The Multiquip 8971479840 is a genuine OEM Piston Ring Set Standard DCA-45USJ 4JG1 designed for the DCA-45USJ ultra-silent diesel generator. As a factory-sourced component, this standard-specification ring set is manufactured to the same tolerances as the original rings installed at the factory, ensuring proper combustion sealing and oil control within the 4JG1 engine. Sourced directly through Multiquip's authorized parts network, this is the correct replacement when your DCA-45USJ is showing signs of oil consumption, compression loss, or excessive blowby.
Key Features
- Genuine OEM Compression Sealing Spec — Ring land dimensions and material grade match the original 4JG1 engine specification, maintaining proper cylinder pressure and combustion efficiency.
- Standard Bore Fit — Standard-dimension rings sized for stock cylinder bore, dropping directly into place during a piston overhaul without the need for custom machining.
- Confirmed Fitment for DCA-45USJ — Engineered specifically for the DCA-45USJ ultra-silent generator equipped with the Isuzu 4JG1 diesel engine.
- Restores Engine Compression and Oil Control — Worn rings allow oil to bypass the piston and combustion gases to enter the crankcase; a fresh ring set brings compression back to operating spec and stops oil burning.
- Long-Term Engine Protection — Proper ring seal reduces heat buildup in the cylinder and protects bearing surfaces from combustion gas contamination, extending overall engine service life.
Piston rings form a dynamic seal between the piston and the cylinder wall, serving two critical roles: containing combustion pressure above the piston to generate power, and scraping excess oil back down the cylinder wall to prevent it from entering the combustion chamber. In a diesel generator like the DCA-45USJ, worn or broken rings cause a loss of compression, increased oil consumption, white or blue exhaust smoke, and hard starting. Replacing the ring set at the standard bore size restores the engine's compression ratio and oil control to original operating condition, getting your generator back to full rated output.
Part Details
| Part Number | 8971479840 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Piston Ring Set Standard DCA-45USJ 4JG1 |
Compatibility & Fitment
| Name | Model |
|---|---|
| DCA-45USJ | DCA-45USJ |
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.
