Multiquip 8972193420 Injector Nozzle DCA-45USJ 4JG1

The Multiquip 8972193420 is a genuine OEM Injector Nozzle DCA-45USJ 4JG1 designed for the DCA-45USJ ultra-silent diesel generator. As a direct OEM replacement, this nozzle is sourced from Multiquip's authorized supply chain and built to the exact spray pattern, flow rate, and pressure tolerances required by the 4JG1 engine. Proper fitment with the DCA-45USJ is confirmed, making this the correct service part when replacing a worn or faulty fuel injector nozzle on that unit. DHS Equipment stocks genuine Multiquip parts so you can get your generator back in service with confidence.

Key Features

• OEM-Matched Spray Geometry — Engineered to the exact atomization angle and orifice sizing specified for the 4JG1 engine, ensuring complete and efficient fuel combustion.
• Direct Drop-In Replacement — Installs directly into the existing injector body on the DCA-45USJ with no modifications to fuel lines, hold-down hardware, or injector return plumbing.
• Confirmed DCA-45USJ Fitment — Verified for the Multiquip DCA-45USJ ultra-silent diesel generator series; use part number 8972193420 when ordering to ensure correct application.
• Consistent Fuel Delivery Under Load — A properly functioning nozzle maintains stable power output and prevents the rough running, black smoke, or fuel dilution that a worn or clogged nozzle causes.
• Fuel System Integrity — Correct injector nozzle seating and spray pattern are critical to preventing raw fuel from washing cylinder walls or entering the crankcase, protecting the wider engine from accelerated wear.

The fuel injector nozzle is the final metering point in the diesel fuel system. It atomizes pressurized fuel into a fine mist that ignites cleanly inside the combustion chamber, directly controlling power output, fuel efficiency, and exhaust quality. When a nozzle wears or becomes clogged, the spray pattern degrades — leading to incomplete combustion, increased fuel consumption, hard starting, and elevated exhaust emissions. Replacing a faulty nozzle with the correct OEM part restores the engine's designed combustion characteristics and protects downstream components from the effects of poor fuel burn.

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.