Isuzu N-Series. Manual — part 328
6A-54 ENGINE MECHANICAL
30. Crankshaft Damper Pulley
1) Apply a coat of engine oil to the threads of the
bolts.
2) Align the damper pulley with the crankshaft
knock pin and tighten the bolts to the specified
torque in numerical order.
Tighten:
Damper pulley bolt to 200 N
⋅m (20.4 kg⋅m / 147 lb⋅ft)
31. Generator Bracket
32. Fan Belt Adjust Plate
33. Injection Pump Assembly
34. Engine Foot
35. Generator
36. Fan Belt
37. Fan Belt Adjustment
38. Vacuum Pump Rubber Hose
39. Vacuum Pump Oil Pipe
40. Oil Filter Assembly
41. Oil Pipe
42. Engine Control Lever Assembly
43. Engine Control Wire
44. Driven Plate
45. Clutch Pressure Plate Assembly
46. Cylinder Head Gasket
Above works refer to “CYLINDER BLOCK” section
in this manual.
47. Cylinder Head Assembly
Above works refer to “CYLINDER HEAD” section
in this manual.
Legend
1. Oil seal
2. Adapter
3. Ring
4. Adapter bolt
5. Sleeve
6. Washer (5 mm (0.20 in))
7. Center bolt
N6A0250E
ENGINE MECHANICAL 6A-55
PISTON AND CONNECTING ROD
Component
Disassembly
1. Cylinder Head Assembly
Above works refer to “CYLINDER HEAD” section
in this manual.
2. Cylinder Head Gasket
Caution:
Do not reuse the cylinder head gasket.
3. Spacer Rubber
4. Oil Pan
5. Oil Pump Strainer
Legend
A. For 4HE1-TC
7. Piston and connecting rod
1. Cylinder head assembly
8. Connecting rod bearing
2. Cylinder head gasket
9. Piston ring
3. Spacer rubber
10. Piston pin snap ring
4. Oil pan
11. Piston pin
5. Oil pump strainer
12. Connecting rod
6. Connecting rod cap
13. Piston
N6A0251E
6A-56 ENGINE MECHANICAL
6. Connecting Rod Cap
1) Take out the connecting rod bearing cap bolts
and remove the bearing cap with the lower
bearing.
2) If the connecting rod lower bearings are to be
reinstalled, mark their fitting positions by tag-
ging each bearing with the cylinder number
from which it was removed.
7. Piston and Connecting Rod Assembly
1) To facilitate smooth removal of piston, remove
carbon from the upper part of the cylinder wall
using a scraper or equivalent.
2) Remove the piston and connecting rod assem-
bly upward by pushing on the edge of the con-
necting rod with a hammer handle or
equivalent.
3) If the connecting rod bearing are to be rein-
stalled, mark their fitting positions by taggfing
each bearing with the cylinder number from
which it was removed.
Caution:
Do not bend or damage the oiling jet.
Notice:
When removing the piston and connecting rod assem-
bly, pull the connecting rod in parallel with the cylinder
bore.
8. Connecting Rod Bearing
If the connecting rod bearings are to be reinstalled,
mark their fitting positions by tagging each bearing
with the cylinder number from which it was re-
moved.
N6A0193E
N6A0196E
N6A0197E
N6A0255E
ENGINE MECHANICAL 6A-57
9. Piston Ring
1) Clamp the connecting rod in a vise.
Take care not to damage the connecting rod.
2) Use piston ring replacer to remove the piston
rings.
Do not attempt to use some other tool to re-
move the piston rings. Piston ring stretching will
result in reduced piston ring tension.
10. Piston Pin Snap Ring
Use a pair of snap ring pliers to remove the piston
pin snap rings.
11. Piston Pin
12. Connecting Rod
13. Piston
Tap the piston pin out with a hammer and a brass
bar. If the pistons are to be reinstalled, mark their
installation positions by tagging each piston with
the cylinder number from which it was removed.
Inspection and Repair
Make the necessary adjustments, repairs, and part re-
placements if excessive wear or damage is discovered
during inspection.
Piston Grade Selection and Cylinder Bore Measure-
ment
Refer to the Section “CYLINDER BLOCK”, Item “Cylin-
der Liner Bore Measurement” for details on piston grade
selection and cylinder liner bore measurement.
Piston Ring
Piston Ring Gap
1. Insert the piston ring horizontally (in the position it
would assume if it were installed to the piston) into
the cylinder liner bore.
2. Push the piston ring into the cylinder liner bore until
it reaches the point (1) where the cylinder liner bore
is the smallest.
Do not allow the piston ring to slant to one side or
the other. It must be perfectly horizontal.
N6A0256E
N6A0257E
Measuring Point
mm (in)
Approx. 150 (6)
N6A0258E
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