3) Inspection of valve and valve guide
(1) Valve
After cleaning valve with fuel, check it.
Valve stem outer diameter
Measure the valve stem outer diameter at 3 positions
(top, middle, and bottom), and check for any wear and
if beyond the limit value, replace the valve.
Valve seat contacting faces
Check the valve seat contact surface for any crack
and wear, and if necessary, correct with grinding
paper, and if excessive, replace it.
Valve head thickness
Measure the thickness of valve head and if beyond the
limit value, replace the valve.
(2) Valve guide
Insert a valve into cylinder head and measure the
clearance between valve guide and valve by valve
movement. If the clearance is excessive, measure the
valve and replace the excessively worn valve or valve
guide.
5ton Diesel Engine SPC000006
Page 47
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