KTM 950 ADVENTURE 2003, Руководство пользователя, Страница: 38 / 160

5-3
Replacing the main bearings-general information
NOTE:
– The bearing shells for the friction bearings are pressed in and out in a
cold state.
– Mark the position of the bearing end gap
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on the engine case with
a felt-tip pin to facilitate reassembly.
– Press the main bearing shells out of both engine case halves from the
inside to the outside using the press mandrel 600.29.044.050
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(smaller diameter).
Before you select the bearing shells you must measure the crankshaft.
– Measure the diameter of the two main bearing pins at 3 points that
are 120° apart using a micrometer gauge. This only applies to
crankshafts that you will continue to use.
Diameter of main bearing pin: 49.965 mm – 49.975 mm (yellow)
49.976 mm – 49.985 mm (blue)
49.986 mm – 49.995 mm (red)
NOTE:
– Use the bearing color indicated for the respective measurement.
– The crankshaft must be replaced if the measurement falls short of the
minimum diameter or if the crankshaft is worn.
– New crankshafts do not need to be measured. Use new bearings
according to the colored circles
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marked on the crankshaft web of
the new crankshaft.
NOTE: there are 2 types of bearings for each bearing color – the
grooved bearing shell (with the lubricating groove and oil bore) is
pressed into the top of the case half of the generator end and the
smooth bearing shells (without lubricating groove) are pressed into the
bottom of the case half of the generator end and into the case half of
the output end
– Measure the bearing bores with a micrometer to ensure that the
bearing shells are seated firmly in the engine case after being pressed
in.
Nominal dimension: 54.000 mm – 54.015 mm
NOTE: if the bearing bores are too big, the engine case must be
replaced.
Measure the inner diameter of the bearings after they are pressed in to
ensure that the bearing clearance is correct.
NOTE: the inner diameter of the bearings must be measured at a 90°
angle to the bearing end gap.
The diameter of the main bearing pin must be deducted from the inner
diameters of the bearings, the difference is the radial clearance of the
main bearing.
Setpoint value for the radial clearance of the main bearing:
0.025 mm – 0.055 mm
Wear limit: 0.080 mm
Example:Inner bearing diameter measured 50.020 mm
Main bearing pin measured 49.980 mm
50.020 – 49.980 = 0.040 mm radial clearance
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