Valve Spring; Valve Spring Free Height; Valve Spring Inclination; Valve Spring Tension - Isuzu A-4JA1 Workshop Manual

Square
3. Apply abrasive compound to the valve seat insert
surface.
4. Insert the valve into the valve guide.
5. Turn the valve while tapping it to fit the valve seat
insert.
6. Check that the valve contact width is correct.
7. Check that the valve seat insert surface is in contact
with the entire circumference of the valve.

VALVE SPRING

Valve Spring Free Height

Use a vernier caliper to measure the valve spring free
height.
If the measured value is less than the specified limit, the
valve spring must be replaced.
Valve Spring Free Height
Standard
49.7 (1.96)

Valve Spring Inclination

Use a surface plate and a square to measure the valve
spring inclination.
If the measured value exceeds the specified limit, the
valve spring must be replaced.
Valve Spring Inclination
Standard
1.5 (0.06) or less

Valve Spring Tension

Use a spring tester to measure the valve spring tension.
If the measured value is less than the specified limit, the
valve spring must be replace.
Valve Spring Tension
Compressed Height
38.9 mm (1.53 in)
ENGINE ASSEMBLY ( 2 )
Limit
48.2 (1.90)
Limit
2.5 (0.098)
kgf(lb/N)
Standard Limit
32.6 29.0
(71.9/319.6) (63.9/284.4)
mm(in)
mm(in)
53