101692-3481/6206-71-1833 Fuel Injection Pump For 6D110 Engine

Core Identification

Engine: Designed specifically for the Komatsu 6D110 series of industrial diesel engines.

Component: Injection Pump, the core high-pressure supply component of a diesel engine's system.

Part Number: 101692-3481 (This is the Komatsu genuine part number).

Function: Delivers precisely metered, high-pressure to each cylinder's injector at the exact moment for atomized injection and combustion.

 

 

1.Pump Type:

Almost certainly an Inline Plunger-Type Injection Pump. This is the most common type for medium-duty industrial engines like the Komatsu 6D110 (distinct from distributor pumps or common rail systems).

It features a plunger pair (pumping element) corresponding to each engine cylinder (6 cylinders), typically arranged in a straight line.

2.Key Components:

Camshaft: Driven by the engine's gear train. Its rotation actuates roller tappets and plungers to create the pumping motion.

Plunger and Barrel Assembly: The core high-pressure generating components. The plunger moves vertically within a precisely matched barrel to generate high pressure. A helical groove on the plunger controls delivery quantity and timing.

Delivery Valve: Located at the top of each pumping element. Closes rapidly at the end of the plunger's delivery stroke, cutting off flow to the high-pressure line, preventing backflow and secondary injection. Ensures a sharp end to injection.

Control Rack: A straight toothed rack running the length of the pump body. Connected via linkage to the engine governor. Moving the rack rotates all plungers synchronously, altering the position of the plunger's helical groove relative to the spill port, thereby precisely controlling delivery quantity (i.e., engine power/speed).

Governor: Typically an integrated mechanical centrifugal governor mounted on the rear (or side) of the pump. It automatically adjusts the control rack based on engine speed to maintain set speeds (stable idle, prevent overspeed). May have adjustment screws for idle and maximum speed. Governor type and settings are critical to pump operation.

Transfer Pump: Usually integrated into the injection pump housing (a piston or vane pump driven by the camshaft). Draws from the tank and supplies it at low pressure to the injection pump's inlet chamber.

Filter: While not part of the injection pump itself, a high-efficiency, clean filter is absolutely essential before the high-pressure pump. Contaminants and water are the primary enemies of the pump's precision components (plunger/barrel, delivery valve).

 

 

 

 

Maximum Injection Pressure: Typically in the range of 20 MPa (200 bar / 2900 psi) or higher. This is the instantaneous high pressure generated by plunger compression.

Firing Order: 1-5-3-6-2-4 (This is the standard firing order for the 6D110 engine; the injection pump must deliver in this sequence).

Injection Timing (Advance Angle): Must be set precisely according to engine model and operating conditions (e.g., X degrees before Top Dead Center - TDC). Determined by the pump's installation phasing relative to the engine drive gear; the pump body may also have fine-tuning mechanisms.

 

 

Wear: Wear on plunger/barrel sets, delivery valves, cam/roller, or bearings is the most common cause of failure, leading to insufficient pressure, uneven delivery, incorrect timing, hard starting, power loss, and smoke (white or black).

Sticking: control rack or plungers sticking due to dirt, water, poor-quality fuel, or corrosion, causing failure to start, engine runaway ("dieseling"), or stalling.

Leaks: Deteriorated or damaged seals causing leaks (external or internal leaks leading to pressure loss).

Maintenance Imperatives:

Use high-quality, clean, low-sulfur diesel fuel.

Replace filters (OEM or equivalent high-quality) regularly.

Regularly drain water from filters and tank.

Avoid prolonged idling or low-load operation (detrimental to pump lubrication).

Entrust diagnosis and repair to a specialist workshop if problems occur.

 

 

 

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