Cylinder Liner Bore Measurement; Cylinder Liner Grade Selection - Isuzu NHR 4J Series Workshop Manual

6A – 58 GENERAL ENGINE MECHANICAL
5. Use a straight edge
measure the four sides and the two diagonals of the
cylinder body upper face.
If the measured values exceeds the limit, the cylinder
body must be replaced.
6A-58-1.tif

Cylinder Liner Bore Measurement

Use a cylinder indicator to measure the cylinder liner bore
at measuring point
direction of the crankshaft.
Measuring Point
If the measured value exceeds the specified limit, the
cylinder liner must be replaced.
NOTE:
The inside of the dry type cylinder liner is chrome
6A-58-2.tif
plated. It cannot be rebored or honed.
If the inside of the cylinder liner is scored or
scorched, the cylinder liner must be replaced.

Cylinder Liner Grade Selection

Measure the cylinder body inside diameter and select the
appropriate cylinder liner grade.
Standard Lifting Interference
If the cylinder liner fitting interference is too small, engine
cooling efficiency will be adversely effected.
If the cylinder liner fitting interference is too large, it will be
6A-58-3.tif
difficult to insert the cylinder liner into the cylinder body.
6A-58-4.tif
!
and a feeler gauge
! "
in the thrust
!
20mm (0.79 in)
0.01 - 0.019 (0.0004 - 0.0007)
"
to
" #
- and axial
mm (in)