Cylinder Head - Inspection
EM-172prose procedureInspection
CYLINDER HEAD DISTORTION
| Specification | Value |
|---|---|
| Cylinder head distortion | Less than 0.1 (0.004)mm (in) |
Cylinder head distortion
Less than 0.1 (0.004)mm (in)
If beyond the specified limit, replace it or resurface it.
Resurfacing limit:
The resurfacing limit of cylinder head is determined by the cylinder block resurfacing in an engine.
Amount of cylinder head resurfacing is "A".
Amount of cylinder block resurfacing is "B".
The maximum limit is as follows:
A + B = 0.2 mm (0.008 in)
After resurfacing the cylinder head, check that camshaft rotates freely by hand. If resistance is felt, the cylinder head must be replaced.
| Specification | Value |
|---|---|
| Cylinder head height (Nominal) | 120 ± 0.1 (4.724 ± 0.004)mm (in) |
Cylinder head height (Nominal)
120 ± 0.1 (4.724 ± 0.004)mm (in)
VALVE GUIDE CLEARANCE
Valve guide clearance should be measured parallel with rocker arm. (Generally, a large amount of wear occurs in this direction.)
| Specification | Value |
|---|---|
| Stem to guide clearance - Maximum limit | 0.10 (0.0039)mm (in) |
| Maximum allowable deflection (Dial indicator reading) | 0.2 (0.008)mm (in) |
Stem to guide clearance - Maximum limit
0.10 (0.0039)mm (in)
Maximum allowable deflection (Dial indicator reading)
0.2 (0.008)mm (in)
To determine the correct replacement part, measure valve stem diameter and valve guide bore.
For dimensions, refer to S.D.S.
See also
S.D.S.