3) flatness
•
Measure flatness of the intake/exhaust manifolds fitting surfaces on the cylinder head using
a straight edge and a feeler gauge.
4) Hydraulic test
•
Hydraulic test method for the cylinder head is same as that for cylinder block.
3.2.
3. Valve and valve guide
1) Valve
Clean the valves with clean diesel oil, then inspect them as follows :
•
Valve stem outer diameter
Measure the valve stem outer diame-
ter at 3 positions. (top, middle, and
bottom) If the amount of wear is
beyond the limit, replace the valve.
•
Valve seat contacting faces
Check the valve seat contacting faces for scratches or wear, and correct the faces with
grinding paper as necessary. Replace if severely damaged.
•
Valve head thickness
Measure the valve head thickness,
and replace the valve if the measured
value is beyond the limit.
- 62 -
INSPECTION AND MEASUREMENT
Standard Limit
0.05 mm 0.2 mm
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