Adjustment Of Injection Timing; Cylinder Compression Pressure Measurement - Isuzu AU-4LE1T Maintenance Manual

Cylinder No.
Valve arrangement
Step 1: Aligning mark groove (1)
with TDC mark
Step 2: Aligning mark groove (2)
with TDC mark
Step 3: Aligning mark groove (1)
with TDC mark
Step 4: Aligning mark groove (2)
with TDC mark
I: Intake E: Exhaust
(3)

Adjustment of Injection Timing

The injection timing may not be readjusted.
Take care not to forget to insert a shim on the mounting surface when
reassembling the injection pump after it was removed.
(4)

Cylinder Compression Pressure Measurement

The cylinder compression pressure measurement must be done every
1000 operation hours, or whenever the engine output is reduced.
Compression pressure: 3.04 MPa (31.0 kg/cm
Test condition: Cranking speed 250 min
Coolant temperature 70 – 85°C (158 – 185°F)
Repair the engine and/or replace some parts of engine if compression
pressure is lower than 2.5 MPa (26 kg/cm
1 2 3 4
I E I E I E I E
2
/ 441 psi)
-1
2
/ 363 psi)
87