Engine - Engine and crankcase
Camshaft gear
Number of teeth
50
Gear bore diameter
50.7900 - 50.8300 mm
(
1.9996 - 2.0012 in
)
Clearance fit of gear on spigot
0.0000 - 0.0600 mm
(
0.0000 - 0.0024 in
)
Idler gear and hub
Number of teeth
90
Gear bore diameter
53.9800 - 54.0200 mm
(
2.1252 - 2.1268 in
)
Diameter of hub
53.9200 - 53.9400 mm
(
2.1228 - 2.1236 in
)
Clearance of gear of hub
0.0300 - 0.0900 mm
(
0.0012 - 0.0035 in
)
Gear hub width
33.4700 - 33.5900 mm
(
1.3177 - 1.3224 in
)
Length of hub
33.7200 - 33.8500 mm
(
1.3276 - 1.3327 in
)
Gear end float
0.1300 - 0.3800 mm
(
0.0051 - 0.0150 in
)
Crankshaft gear
Number of teeth
25
Diameter of bore
38.0900 - 38.1300 mm
(
1.4996 - 1.5012 in
)
Spigot diameter of crankshaft
38.1000 - 38.1100 mm
(
1.5000 - 1.5004 in
)
Transition fit of gear on crankshaft
0.0300 - 0.0300 mm
(
0.0012 - 0.0012 in
)
Crankcase - General specification
TT45 model
The following data of clearances and tolerances are given as a guide for personnel engaged in major overhauls and
the figures are those used in the factory for production purposes.
Cylinder block
Height of cylinder block (Top to bottom faces)
349.009 - 349.085 mm
(
13.741 - 13.744 in
)
Parent bore diameter for cylinder liner
98.000 - 98.022 mm
(
3.858 - 3.859 in
)
Depth of recess for liner flange (C.I. liners)
3.940 - 3.990 mm
(
0.155 - 0.157 in
)
Diameter recess of liner flange (C.I. liners)
102.710 - 102.810 mm
(
4.044 - 4.048 in
)
Main bearing parent bore
74.079 - 74.105 mm
(
2.916 - 2.918 in
)
Number 1 bore for camshaft
47.600 - 47.625 mm
(
1.874 - 1.875 in
)
Number 2 bore for camshaft
47.350 - 47.375 mm
(
1.864 - 1.865 in
)
Number 3 bore for camshaft
47.100 - 47.125 mm
(
1.854 - 1.855 in
)
Number 4 bore for camshaft
46.840 - 46.865 mm
(
1.844 - 1.845 in
)
Cylinder liners - cast iron
Type - production liner
Dry semi finished - interference fit
Type - service liner
Dry pre finished transition fit
Outside diameter of liner
98.047 - 98.075 mm
(
3.860 - 3.861 in
)
Interference fit of liner in cylinder block
0.025 - 0.075 mm
(
0.001 - 0.003 in
)
Inside diameter of finished liner in cylinder block
95.000 - 95.022 mm
(
3.740 - 3.741 in
)
Outside diameter of liner flange
102.540 - 102.640 mm
(
4.037 - 4.041 in
)
Flange thickness
4.000 - 4.020 mm
(
0.157 - 0.158 in
)
Liner protrusion above cylinder block machined surface
0.030 - 0.080 mm
(
0.001 - 0.003 in
)
(Above top face of block)
NOTE:
Reboring to oversize is not recommended.
Pistons
Type
Alfin piston with re-entrant bowl and valve pocket on
crown. Offset of combustion bowl in piston crown should
be to the fuel injection pump side while assembling piston
in engine. (Offset of valve pockets towards camshaft
side).
Piston height above cylinder block top face
0.090 - 0.150 mm
(
0.004 - 0.006 in
)
(Above block surface)
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