Doosan D35S-5 Service Manual page 58

3. Check the valve tappet (1) for any damage or
wear.
4. Measure the rocker inner diameter and rocker
shaft outer diameter. Replace the bush of rocker,
if the gap exceeds the limit
Items
Inner diameter
18.980 ~ 18.993 mm
of rocker bush
Outer diameter
19.05 ~ 19.09 mm
of rocker shaft
Gap
D439E Service Manual
Standard
0.06 ~ 0.11 mm 0.2 mm
5. Inspect the out of squareness (A), free length (B),
load installed (C) of valve spring, replace it if any
of them exceeds the limit.
Items
Outer
side
Valve
spring
Inner
side
Valve
spring
Limit
-
-
56
Standard
Free length 66.1 mm
Load
27.9 ± 1.4 kg
installed
Out of
1.5 mm
squareness
Free length 60 mm
Load
12.1 ± 0.6 kg
installed
Out of
1.5 mm
squareness
2. Engine Mechanical System (D439E)
Limit
63 mm
23.7 kg
2.1 mm
57 mm
10.3 kg
2.1 mm