Mitsubishi Heavy Industries L2, Service Manual

Page: 51 / 156

50 / 155 Service Manual Mitsubishi L-Series diesel engines
Version 08/2004
ENGLISH
VALVES AND VALVE SPRINGS ENGINE MAIN PARTS
10.2 Removal
1. Dismount the cylinder head assembly.
2. Press the valve spring retainer (to compress the
valve spring) and remove the valve lock.
3. Remove the valve and place it cylinder by cylinder.
10.3 Inspection and repair
Check the removed parts. If any parts are found
defective, repair or replace them.
Figure 44 Removing valve and valve spring
Figure 45 Inspection of valve and valve spring
Figure 46 Valve spring tester
Wear and
damage
(Not installed
to agricultural
model)
Fatigue and
damage
Margin
Dents and
wear
Ridge and
damage
Valve fatigue and damage
Inspection item Standard Service limit
Free length
(61SG, 63SG)
(Others)
mm [in.] 40.5 [1.5945]
40.0 [1.5748] -1
[-0.0394]
Set force/Set
length
(61SG, 63SG)
(Others)
N (kgf) [lbf]/
mm [in.]
58 (5.94) [13.1]/
35.5 [1.3976]
146 (14.84) [32.7]/
28 [1.1024]
68 (6.89) [15.2]/
35.5 [1.3976]
180 (18.36) [40.5]/
28 [1.1024] -15%
Perpendicularity 2° 3°
Margin mm [in.] 1.0
[0.0394] 0.5
[0.0197]
Table 20 Valve inspection and repair