Isuzu AA-6HK1T, Workshop Manual

Page: 160 / 242

ENGINE MECHANICAL 6A–109
1. Remove the lower crankcase.
•
Loosen the fixing bolts to disassemble the lower
crankcase.
•
Place the crankcase on a flat piece of wool.
2. Remove the oil jet.
Loosen the bolt to remove the oil jet.
NOTE: Take care not to bend or damage the oil jet.
3. Remove the cylinder liner.
•
Use a scraper to remove carbon deposits.
•
Use a cylinder bore dial indicator to measure the
cylinder bore in the thrust and axial direction of the
crankshaft before removing the cylinder liner.
Measuring point: 20 – 25 mm (0.79 – 1.0 in.)
If the measured value exceeds the specified limit,
the cylinder liner must be replaced.
Cylinder liner bore
Limit: 115.2 mm (4.5354 in.)
NOTE: If the inside of the cylinder liner is scored or
scratched, the cylinder liner must be replaced.
The cylinder liner is loose fit type.
The cylinder liner can be removed with hands.
If the cylinder liner removal is difficult, press it from
the crankcase side.
Visually inspect the cylinder block for damage.
Inspection and Repair
Make the necessary adjustment, repairs, and part
replacements if excessive wear or damage is
discovered during inspection.
Cylinder Block Flatness
•
Remove the cylinder liners.
•
Inspect the cylinder block for cracks and other
damage. Check the oil and water holes for
clogging.
If possible, use dye pendant flow detector.
•
Use a straight edge (1) and a feeler gauge (2) to
measure cylinder block upper face warpage (4
sides and 2 diagonals as shown in the illustration).
Upper face warpage
Limit: 0.2 mm (0.008 in.)
012EY00036
012EY00043