Doosan DX22 - Replacing the Camshaft Bearing

10. Cylinder Block/Head
147
3. Cam bearing diameter
EDX22190051
1) Measure the inside diameter of the camshaft bushing with
a cylinder gauge; then, compare the inside and outer
diameters and replace the part if the measurements
deviate from the normal values.
• Camshaft bearing inside diameter
4. Clearance
1) Clearance between the camshaft journal and camshaft
body
• Clearance between the camshaft journal and bushing
Replacing the Camshaft Bearing
1. Replacing the Camshaft Bearing
EDX22190052
1) Use a disassembly/assembly tool to replace the camshaft
bearing.
2. Camshaft runout
EDX22190053
1) Place the camshaft on two V-blocks; then, check and
adjust the camshaft runout. If severe, replace the part.
• Camshaft deflection
Item Reference value Allowable limit
Thrust
Ø
70.070 ~
Ø70.090 mm
(Ø2.7587 ~
Ø2.7594 in.)
Ø69.464 mm
(2.7348 in.)
Middle
Ø70.070 ~
Ø70.030 mm
(Ø2.7587 ~
Ø2.7571 in.)
Ø69.192 mm
(2.7241 in.)
Item Reference value Allowable limit
Thrust
0.060 ~ 0.120 mm
(0.0024 ~ 0.0047 in.)
0.240 mm
(0.0094 in.)
Middle
0.130 ~ 0.180 mm
(0.0051 ~ 0.0071 in.)
0.240 mm
(0.0094 in.)
Reference value Allowable limit
0.05 mm (0.002 in.) 0.15 mm (0.0059 in.)