Valve And Valve Seat Insert; Valve Guide Installation; Valve Stem Outside Diameter; Valve Thickness - Isuzu A-4JA1 Workshop Manual

ENGINE ASSEMBLY ( 2 )
50
H

Valve Guide Installation

1. Apply engine oil to the valve guide outer circumfer-
ence.
2. Attach the valve guide replacer to the valve guide.
3. Use a hammer to drive the valve guide into position
from the cylinder head upper face.
Valve Guide Replacer: 9-8523-1212-0
4. Measure the height of the valve guide upper end
from the upper face of the cylinder head.
Valve Guide Upper End Height (H)
(Reference)
Note:
If the valve guide has been removed, both the valve and
the valve guide must be replaced as a set.

VALVE AND VALVE SEAT INSERT

Valve Stem Outside Diameter

Measure the valve stem diameter at three points.
If the measured value is less than the specified limit, the
valve and the valve guide must be replaced as a set.
Valve Stem Outside Diameter
Intake Valve
(0.3129 – 0.3134)
Exhaust Valve
(0.3118 – 0.3124)

Valve Thickness

Measure the valve thickness.
If the measured value is less than the specified limit, the
valve and the valve guide must be replaced as a set.
Intake and Exhaust Valve Thickness
Standard
1.8 (0.071)
13.0 (0.512)
Standard
7.949 – 7.961
7.921 – 7.936
Limit
1.5 (0.059)
mm(in)
mm(in)
Limit
7.88
(0.3102)
7.88
(0.3102)
mm(in)