Doosan GL08K - Page 68

Maintenance - 62 -
2) Distortion at the lower face
a) Check for the cylinder head.
 Remove carbon from the cylinder head lower surface, and then should be careful not to
scratch the surface.
 Check any crack or damage that can not found by naked eyes through the hydraulic or
magnetic particle test.
b) Distortion of lower surface
 As shown in figure, measure the
cylinder head's distortion at 6
directions with horizontal ruler and
clearance gauge.
 If the measured value is beyond
the limit value, correct it by means
of the fine grindi ng paper or
grinding machine.
 If it is beyond the max. allowable
value, replace the cylinder head
< 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.
(t)
A
B
C
D
E
EA3M2031
F
EA6M2002
Standard Limit
Warpage
0.2 mm
or less
0.3 mm
Thickness : t
(reference)
109.9 ~
110.1 mm
108.4 mm
Standard Limit
0.05 mm 0.2 mm