Doosan P158LE -III, Operation & Maintenance Manual

Page: 70 / 165

Inspection - 67 -
d) Valve spring
z
Inspect the outlook of valve spring
and if necessary replace it.
z
By means of spring tester,
measure the tension and free
length.
z
Measure the perpendicularity of
valve spring.
z
In case that the measured value
exceeds the limit value, replace it.
<Perpendicularity regular>
e) Assembling cylinder head
z
Clean the cylinder head thoroughly.
z
Coat the valve stems and valve guides with engine oil and assemble the valves.
z
Replace the valve stem seals with new ones and insert the stem seals to the valve guides of
cylinder head with a special tool. (Be careful for the valve stem seals not to be damaged)
z
Install the valve spring washer to valve guide.
z
After putting on the inside, outside spring, install the valve spring seat on them.
NOTE :
Install the valve spring seat with “TOP” (painted in yellow) side up.
z
Pressing the spring down with a
special tool, assemble by inserting
the valve cotter.
z
After the valve is assembled,
inspect the valve tapping it lightly
with an urethane hammer if
accurate assembling was done.
Inside Spring
Free length 65.5 mm
When given a regular load
(15 ~ 17 kg)
46.3 mm
Outside Spring
Free length 64 mm
When given a regular load
(37 ~ 41 kg)
46.3 mm
EFM2039I
1.0 mm or less
Free length
EFM2040I