This is a genuine Mitsubishi fuel injection nozzle (or injector assembly, depending on the specific configuration).
Key Details:
Compatibility: Mitsubishi S6R series (commonly S6R2, S6R-YPTAW, etc., used in generator sets).
Injector Assembly: This part number often corresponds to the complete injector assembly that fits these engines. It is the direct replacement for the original equipment.
Cross Reference: It is frequently sold alongside or as a replacement for assembly number 37013-05940.
The injector 37013-05946 for the Mitsubishi S6R generator engine is a nozzle holder assembly (complete injector) designed for heavy‑duty, continuous operation. Its structural characteristics align with Mitsubishi’s proven “P‑type” or “PN‑type” nozzle family, commonly used in the S6R series. Below are the key structural features:
1. Type & Configuration
Complete injector assembly – includes the nozzle, nozzle holder, pressure adjusting screw, and fuel inlet/leak-off connections.
Mechanically actuated – used with an in‑line injection pump (individual pump per cylinder) typical of the S6R engine.
Flange‑mount design – secured to the cylinder head with a clamp or flange bolts, ensuring precise positioning in the combustion chamber.
2. Nozzle Design
Multi‑hole orifice – usually 5 to 7 holes, each with a diameter in the range of 0.25–0.35 mm, depending on the exact engine variant (S6R2‑PTA, S6R2‑PTAA, etc.).
Hole pattern & spray angle – optimized for the S6R’s pre‑combustion chamber (or direct injection) configuration; spray angle typically 150°–160° for even fuel distribution.
Valve covered orifice (VCO) or mini‑sac type – reduces sac volume to minimize hydrocarbon emissions and improve injection consistency.
3. Operating Pressure
4. Materials & Durability
Nozzle body & holder – made from high‑strength alloy steel, heat‑treated to resist wear and cavitation.
Needle valve – precision‑ground, with a hardened tip for long service life under high injection pressures.
External components – anti‑corrosion treated to withstand high‑humidity generator environments.
5. Sealing & Leak‑off System
Copper sealing washer – replaces the nozzle holder to cylinder head seal; must be replaced when installing a new injector.
Integrated leak‑off connection – returns excess fuel to the tank, often via a banjo bolt with a pressure‑limiting valve.
6. Compatibility Note
While the injector physically fits all S6R blocks, the spray pattern and opening pressure must match the specific combustion chamber design. For generator sets, the S6R2‑PTA, S6R2‑PTAW, and S6R2‑PTAA often use the same injector family, but always verify using the engine serial number and Mitsubishi’s parts catalog to confirm 37013-05946 is the correct supersession or replacement.
