Isuzu 4LC1 - Engine Inspection and Repair

42 ENGINE
Cylinder bore diameter and grade mark
The grade mark is stamped on the top surface of the
cylinder block (on the mating face with the cylinder
head).
Bore grade mark
(Stamp position)
INSPECTION AND REPAIR
Make the necessary adjustments, repairs, and part replacements if excessive wear or damage is dis-
covered during inspection.
Y
X
X
1. CYLINDER BLOCK
Cylinder block
Check the cylinder block for wear, damage or any other
defects.
Use the hydraulic gauge to check the water jacket water
pressure.
Apply water pressure to the water jacket at 5 kg/cm
2
(71.1 psi) for three minutes.
Cylinder bore
Measurement position: 13mm below the top
(Measure in X-X and
Y-Y directions.)
(Near the No. 1
compression ring)
mm (in.)
Engine Limit Repair method
4LB1
4LC1 0.2 (0.0079)
4LE1
Perform boring and
honing of the inner
diameter.
Fig. 58
Fig. 59
Fig. 60