Camshaft
l
Journal wear:
l
Runout of camshaft:
Hold camshaft between two
“V”
blocks, and
measure runout by using a dial gauge.
If runout exceeds its limit, replace camshaft.
Measure journal diameter in two directions at
two places (total of 4 readings) on each
journal as shown in Fig. 3-5-25, and also by
using bore gauge, measure journal bore in
cylinder head as shown in Fig. 3-5-26 (i.e. 4
readings on each journal).
Subtract journal diameter measurement from
journal bore measurement to determine
journal clearance.
If journal clearance exceeds its limit, replace
camshaft, and as necessary, cylinder head, too.
I
Runout limit
1
0.10 mm (0.0039 in.)
1
Fig.
3-5-23
0
Cam wear:
Using a micrometer, measure height (H) of
cam (lobe). If measured height is less than
respective limits, replace camshaft.
Cam height
Standard
Limit
Intake cam
37.500 mm
37.400 mm
(I
.4763
in.)
(1.4724 in.)
,
I
Exhaust cam
37.500 mm
37.400 mm
(I
.4763
in.)
(I
.4724
in.)
I
r
Fuel pump
40.000 mm
39.600 mm
drive cam
(I
.5748 in.)
(1.5590 in.)
Fig. 3-5-24
3-24
I
I
Standard
1
I
Journal
clearance
limit
0.050
-
0.091 mm
(0.0020
-
0.0036 in.)
Camshaft journal dia.
Journal bore dia.
@ 44.125 44.150
-
mm
44.200
-
44.216 mm
(I.7372
-
1.7381
in.)
(1.7402
-
I
.7407
in.)
@ 44.325 44.350 mm
-
44.400 44.416 mm
(1.7451
-
1.7460 in.) (I .7480
-
I
.7486
in.)
0
44.525 44.550 mm
-
44~600
44.616 mm
-
(1.7530
-
I
.7539
in.)
(I
.7560
-
I
.7565
in.)
Fig. 3-5-25
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