Mitsubishi S4Q, User Manual

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50 / 174 Service Manual Mitsubishi SQ-Series diesel engines
Version 08/2004
ENGLISH
TIMING GEARS, CAMSHAFT AND OIL
PAN
ENGINE MAIN PARTS
3. Replacing idler gear shaft
To remove the shaft for replacement, use idler gear
shaft puller (MH061077).
9.2.3 Camshaft
1. Checking lobe lift
To fine the lobe lift, use the procedure that follows:
1) Measure lobe height (A).
2) Measure base circle (B).
3) Subtract base circle (B) from lobe height (A).
The difference is lobe lift (C).
If the lobe lift is less than the service limit,
replace the camshaft.
Unit: mm [in.]
Figure 74 Replacing idler gear shaft
Idler gear shaft puller
NOTE
When installing a replacement shaft to the crankcase,
make sure the oil hole in the shaft points upward.
Figure 75 Measuring cam lift
Measuring
points
Measuring
directions
C
A
B
Item
Nominal
Value
Assembly
Standard
Service
Limit
Lobe
lift
Inlet
valve
A=
46.916
[1.84709]
[lobe height]
C=
6.684
[0.2631]
C=
6.184
[0.2435]
Exhaust
valve
A=
45.944
[1.80882]
[lobe height]
C=
7.344
[0.2891]
C=
6.844
[0.2694]
+0.1
0.3 –
+0.1
0.3 –