Doosan DE08TS - Page 40

DE08TS Diesel Engines Maintenance
<Lower face warpage and height>
c. Flatness
Check the flatness of the installing surface of cylinder
head’s intake and exhaust manifolds with horizontal
ruler and clearance gauge.
d. The hydraulic test
The hydraulic test of cylinder head is same as the
cylinder block test.
3. Inspection of valve and valve guide
a. Valve
After cleaning valve with fuel, check it.
• Valve stem outer diameter
Measure the valve stem outer diameter at 3 posi-
tions (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.
EFM2037I
EFM2036I
End of stem
EA9M3020
38
Standard Limit
Warpage 0.2 mm or less
0.3 mm
Thickness : t
109.9 ~ 110.1 mm 108.4 mm
(reference)
Standard Limit
0.05 mm 0.2 mm
Dimension
Standard Limit
Description
Intake
N8.950 ~ N8.970 mm N8.93 mm
valve stem
Exhaust
N8.935 ~ N8.955 mm
N8.91 mm
valve stem
Dimension
Standard Limit
Description
Intake valve 2.7 mm 1 mm or less
Exhaust valve 2.2 mm 1 mm or less