FUEL SYSTEM - DISASSEMBLY, INSPECTION AND REASSEMBLY
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1. Fuel Injection Nozzles
1.1 Disassembling the fuel injection nozzles
Wear
Fatigue,
Perpendicularity
Wear, Damage
Carbon deposit,
Clogged nozzle hole
Replace: Gasket
Disassembly of the fuel injection nozzle
<Reassembly sequence>
① Nozzle retaining nut
② Nozzle tip assembly
③ Piece
④ Pin
⑤ Spring
⑥ Washer
⑦ Nozzle holder
⑧ Gasket
1.2 Inspecting the fuel injection nozzle
Conduct the following inspections and, if faulty,
repair or replace as required.
(1) Injection valve opening pressure
(a) Install the fuel injection nozzle onto the nozzle
tester. Pump the tester handle up and down to
bleed air.
(b) Pump the tester handle at a rate of approx. one
cycle per second while observing the needle of
the tester.
Note: The needle should rise slowly and, during fuel
injection, should vibrate. The pressure at which
the needle starts to vibrate is the injection valve
opening pressure.
Inspecting the injection valve
opening pressure
Nozzle tester
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