Isuzu A-4JB1 Repair Manual

ENGINE ASSEMBLY ( 2 )
3. Use a screwdriver 3 to pry the valve seat insert
free.
Take care not to damage the cylinder head 4 .
4. Carefully remove carbon and other foreign material
from the cylinder head insert bore.
52
Valve Seat Insert Installation
1. Carefully place the attachment 1 (having a smaller
outside diameter than the valve seat insert) on the
valve seat insert 2 .
Note:
The smooth side of the attachment must contact the
valve seat insert.
2. Use a bench press 3 to gradually apply pressure to
the attachment and press the valve seat insert into
place.
Note:
Do not apply an excessive amount of pressure with the
bench press. Damage to the valve seat insert will result.
1
2
3
Valve Seat Insert Correction
1. Remove the carbon from the valve seat insert sur-
face.
2. Use a valve cutter (15°, 45°, and 75° blades) to
minimize scratches and other rough areas. This will
bring the contact width back to the standard value.
Remove only the scratches and rough areas. Do not
cut away too much. Take care not to cut away
unblemished areas of the valve seat surface.
Valve Seat Angle 45°
Note:
Use an adjustable valve cutter pilot.
Do not allow the valve cutter pilot to wobble inside the
valve guide.
30˚
90˚
150˚

Isuzu A-4JB1 Specifications

General

Brand	Isuzu
Model	A-4JB1
Category	Engine
Language	English