Isuzu AU-4LE1T - Adjustment of Injection Timing; Cylinder Compression Pressure Measurement

87
Cylinder No. 1 2 3 4
Valve arrangement I E I E I E I E
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
2
/ 441 psi)
Test condition: Cranking speed 250 min
-1
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
2
/ 363 psi)