Engine - Engine and crankcase
Crankcase - General specification
Crank gear
Crankshaft - bearings
Main journal diameter
79.791 – 79.810 mm
(
3.141 – 3.142 in
)
Main journal undersize
0.254 mm
(
0.010 in
) –
0.508 mm
(
0.020 in
) –
0.762 mm
(
0.030 in
) –
1.016 mm
(
0.040 in
)
Main bearing wall thickness
2.168 – 2.178 mm
(
0.085 – 0.086 in
)
Main bearing undersize
0.254 mm
(
0.010 in
) –
0.508 mm
(
0.020 in
) –
0.762 mm
(
0.030 in
) –
1.016 mm
(
0.040 in
)
Main journal clearance in bearings
0.034 – 0.103 mm
(
0.001 – 0.004 in
)
• Maximum wear clearance
0.180 mm
(
0.007 in
)
Crankpin diameter
63.725 – 63.744 mm
(
2.509 – 2.510 in
)
Crankpin undersize
0.254 mm
(
0.010 in
) –
0.508 mm
(
0.020 in
) –
0.762 mm
(
0.030 in
) –
1.016 mm
(
0.040 in
)
Big end bearing wall thickness
1.805 – 1.815 mm
(
0.071 – 0.071 in
)
Big end bearing undersize
0.254 mm
(
0.010 in
) –
0.508 mm
(
0.020 in
) –
0.762 mm
(
0.030 in
) –
1.016 mm
(
0.040 in
)
Crankpin clearance in big end bearing
0.033 – 0.087 mm
(
0.001 – 0.003 in
)
• Maximum wear clearance
0.180 mm
(
0.007 in
)
Crankshaft thrust washer thickness
3.378 – 3.429 mm
(
0.133 – 0.135 in
)
Thrust washer oversize
0.127 mm
(
0.005 in
) –
0.254 mm
(
0.508 in
) –
0.508 mm
(
0.020 in
)
Width of main bearing housing over thrust washers
31.766 – 31.918 mm
(
1.251 – 1.257 in
)
Length of corresponding main journal
32.000 – 32.100 mm
(
1.260 – 1.264 in
)
Crankshaft end float
0.082 – 0.334 mm
(
0.003 – 0.013 in
)
• Maximum wear clearance
0.400 mm
(
0.016 in
)
Maximum main journal and crankpin ovality or taper after
grinding
0.0100 mm
(
0.0004 in
)
Maximum main journal and crankpin ovality or taper due
to wear
0.0500 mm
(
0.0020 in
)
Maximum main journal misalignment crankshaft resting
on end journals
0.0100 mm
(
0.00039 in
)
Maximum misalignment of crankpins relative to main
journals (in either direction)
0.2500 mm
(
0.00984 in
)
Tolerance from outer crankpin edge to crankshaft center
line
±
0.1000 mm
(
0.0039 in
)
Maximum crankshaft flange run-out with gauge stylu,
over
108.000 mm
(
4.252 in
) diameter (total gauge
reading)
0.0250 mm
(
0.0010 in
)
Maximum flywheel seat eccentricity relative to main
journals (total gauge reading)
0.0400 mm
(
0.0016 in
)
47866580 11/12/2015
10.1 [10.001] / 5
Summary of Contents for TT4.80
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