4FUEL_INJECTION_PUMP.DOC

FUEL INJECTION PUMP

1. Fuel tank2. Strainer3. Fuel filter4. Fuel injection pump5. Feed pump6. Nozzle

Advanced Engine Mechanic Development 1

FUEL SYSTEM

FUEL INJECTION PUMP

Advanced Engine Mechanic Development 2

FEED PUMP

Check Valve

Priming Pump

Check Valve

Feed Pump Filter

FUEL INJECTION PUMP

PUMPING PROCESS

A. SuctionB. DischargeC. Floating

Advanced Engine Mechanic Development 3

FUEL INJECTION PUMP

FUEL INJECTION PUMP

Function: Regulated fuel quantity and timing, to be injected to engine (combustion chamber)

Types of Fuel Injection Pumps, according by Bosch:

PE-K Type, for Komatsu engine models 2D94 PEA Type, for Komatsu engine models 4D120, 4D130, 6D105 PES-A Type, for Komatsu engine models 3D94, 4D94, 4D105 PES-AD Type, for Komatsu engine models SA6AD110 PES-PD Type, for Komatsu engine models S6D155 PE-ZW Type, for Komatsu engine models SA6D170-A

Explanations type of Injection Pump:

PE-K Type: small sized, lightweight, pump and governor are made as one unit. PE-A Type: Most extensively used. Pump, governor and feed pump are integrated into one unit. PE-P Type: Large-sized, high-speed pump. The pump housing is totally enclosed. Plunger, delivery valves,

etc. can becan be removed and installed as one unit.

PE-Z Type: This is PEP type with increased capacity.

Note: Pump S and D have the following meaning (e.g. PES-PD)S: Flanged type (without S: Coupling type)D: Increased injection quantity and reinforced type.

Advanced Engine Mechanic Development 4

FUEL INJECTION PUMP

INJECTION PUMPS TYPE CODES:

NP P E S 6 A 80 C 4 2 1 R N229

ND P E S 4 A 50 C 4 2 0 R S256

1 2 3 4 5 6 7 8 9 10 11 12 13

(1) Injection pumps manufacturer’s codesNP: Diesel Kiki CO., LTD.ND: Nippon Denso CO., LTD.

(2) P denotes an injection pump.(3) E indicates that the injection pump has a camshaft.(4) S indicates flanges mounting, without S coupling mounting to engine.(5) Number of plungers (number of cylinders).(6) Pump basic type: A, B, K, P, Z, AD, PD etc.(7) Plunger O.D. (mm) x 10(8) Design code by Robert Bosch G.m.b.H(9) Used of feed pump and setting direction of camshaft.*(10) Used of governor and its position.*(11) Used of timer and its position.*(12) Direction of rotation. R is CW from driving side; L is CCW from driving side.(13) Manufacturers design code.

Advanced Engine Mechanic Development 5

FUEL INJECTION PUMP

Advanced Engine Mechanic Development 6

Construction of injection pump PE-A type *Construction of injection pump PES-PD type *

FUEL INJECTION PUMP

INDIVIDUAL FUEL INJECTION PUMP FUEL INJECTION PUMP

Advanced Engine Mechanic Development 7

FUEL INJECTION PUMP

DRAWING EXPLANATION           

  1 . Straight pin 12 . Delivery valve spring  2 . Flange sleeve 13 . Delivery valve  3 . Pump housing 14 . Adjust shim   4 . Plunger spring 15 . Plunger  5 . Lower spring seat 16 . Plunger barrel  6 . Control rack 17 . Guide pin  7 . Rack guide screw 18 . Control pinion   8 . Plunger seat 19 . Tappet  9 . Camshaft 20 . Cover  10 . Delivery valve holder 21 . Center metal   11 . Delivery valve stopper 22 . Cover             

Advanced Engine Mechanic Development 8

FUEL INJECTION PUMP

PLUNGER HEAD BEGIN INJECTION END INJECTION

INJECTION NO INJECTION

Advanced Engine Mechanic Development 9

BeginningOf Injection Injection End of Injection

Beginning suction