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ENGINE
33
CAMSHAFT:
Standard and Repair sizes of journals and bushes
Camshaft
Camshaft bearing Finished bore
Crank pin for
bearing No.
journal dia
diameter of pressed vacuum pump
mm
in bearing mm
mm
Standard
1
55.960/55.941
56.030/56.000
32.000
2
55.710/55.691
55.770/55.740
31.984
3
55.460/55.441
55.520/55.490
Standard – I
1
55.860/55.841
55.930/55.900
31.900
2
55.610/55.591
55.670/55.640
31.384
3
55.360/55.341
55.420/55.390
Repair size – I
1
55.710/55.691
55.780/55.750
31.750
2
55.460/55.441
55.520/55.490
31.734
3
55.210/55.191
55.270/55.240
Repair size – II
1
55.460/55.441
55.530/55.500
31.500
2
55.210/55.191
55.270/55.240
31.484
3
54.960/54.941
55.020/54.990
Parent bore of camshaft bearing in cylinder block.
60.030/60.000
mm
Outside diameter of cam bush
60.18/60.15
mm
Radial clearance of camshaft journals –
1st journal
0.040-0.089
mm
2nd & 3rd journals
0.030-0.079
mm
Axial play of camshaft
0.085-0.265
mm
Maximum permissible radial runout of camshaft when supported at 1 &
3 journals measure at :
Cam base circle
0.025
mm
Helical gear
0.06
mm
Bearing journal No. 2
0.025
mm
Camshaft gear seat
0.02
mm
Permissible concentricity of spigot dia for FIP drive gear w.r.t bore on
0 02
mm
camshaft gear
Permissible runout of flyweight butting face w.r.t bore on camshaft gear
0.05
mm
Hardness of bearing journals base circle and cam lobes
57-63
HRC
Permissible runout of flyweight butting face w.r.t bore on FIP drive gear
0.03
mm
Backlash between camshaft gear and crankshaft gear
0.12-0.17
mm
Backlash between injection pump drive gear and driven gear.
0.12-0.17
mm
Backlash between oil pump driving gear and driven gear
0.18-0.34
mm
Camshaft spigot diameter for camshaft gear.
34.995/34.980
mm
Camshaft gear I.D.
35.025/35.000
mm
Fuel injection pump drive gear I.D.
50.025/50.000
mm
Spigot dia for FIP drive gear on camshaft gear
49.975/49.959
mm
Timer fly weight OD. Fig. 11.
38.000/37.961
mm