Engine Components; Crankshaft; Checking The Crankshaft Dimensions; Radial Clearance Of The Big End - SHERCO 250 SE-R 2017 Workshop Manual

ENGINE COMPONENTS

❱❘ Crankshaft
- If you replace the roller bearing it is also
necessary to replace the inner ring which is
located next to the counterweight.
- Heat special tool R464 to approximately
150°C, place it immediately on the inner ring.
Allow the heat to penetrate the ring and then
carefully remove it.
- In order to install a new ring, heat the tool to
150°C again. Insert the ring in the tool and slip
it onto the crankshaft.
❱❘ Checking the crankshaft dimensions
- With a Vernier caliper measure the distance
over the ouside
counterweights.
Overall dimension: 64.3 +0/-0.2 mm
❱❘ Radial clearance of the big end
- Place the crankshaft in a set of « V » blocks
and place a dial indicator [A] against the big
end of the rod.
- Push [B] the rod towards the gauge and then
pull it in the opposite direction. The difference
between the two dimensions is the big end
radial clearance.

Radial clearance of the big end:

Standard: 0.015 mm – 0.025 mm
Permissible limit: 0.06 mm
If the radial clearance is greater than the
permissible limit, the crankshaft must be
replaced.
24
of the

crankshaft

250-300 SE-R
64,30 mm
B A