Ring Gear Installation; Piston; Piston Ring Gap - Isuzu A-4JA1 Workshop Manual

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Ring Gear Installation

1. Heat the ring gear evenly with a gas burner to invite
thermal expansion.
Do not allow the temperature of the gas burner to
exceed 200°C (390°F).
2. Install the ring gear when it is sufficiently heated.
The ring gear must be installed with the chamfer
facing the clutch.
Note:
Another method of heating the ring gear to invite ther-
mal expansion is to soak a rag in diesel fuel, wrap the
diesel fuel soaked rag around the rim of the ring gear,
and then light the rag.

PISTON

Piston Grade Selection and Cylinder Liner Bore
Measurement
Refer to the Section "CYLINDER BODY", Item "Cylinder
Liner Bore Measurement" for details on piston grade
selection and cylinder or liner bore measurement.
PISTON RING

Piston Ring Gap

1. Insert the piston ring horizontally into the cylinder
liner.
2. Use a piston inserted upside down to push the
piston ring into the cylinder liner until it reaches
either measuring point 1 or measuring point 2.
Cylinder liner diameter is the smallest at these two
points.
Do not allow the piston ring to slant to one side or
the other. It must be perfectly horizontal.
3. Use a feeler gauge to measure the piston ring gap.
Measuring Point 1 : 10 mm (0.39 in)
Measuring Point 2 : 120 mm (4.72 in)
If the piston ring gap exceeds the specified limit, the
piston ring must be replaced.
ENGINE ASSEMBLY ( 2 )
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