30
Manuale di Officina RR 4T - 400 - 450 - 525
Left-hand crankcase half
Remove all the oil seals and heat the crankcase half in an oven
at a temperature of approximately 150° C.
Crankshaft roller bearing 1
Using a suitable drift, push in the bearing from the outside. Fit
the new bearing, pushing it from the inside to its abutting end.
Driving shaft ball bearing 2
Using a suitable drift, push in the bearing from the outside. Fit
the new bearing, pushing it from the inside to its abutting end.
Driven shaft roller bearing 3
Using a suitable drift, push in the bearing from the outside. Fit
the new bearing, pushing it from the inside to its abutting end.
Gear shaft oil seal 4
Fit the new oil seal pushing it from the outside to the correct le-
vel, with the open side facing inward.
Driven shaft oil seal 5
Fit the new oil seal pushing it from the outside to the correct le-
vel, with the open side facing inward.
Countershaft ball bearing 6
Using a bearing puller, extract the bearing from the crankcase
half.
Insert the new bearing and push it to its abutting end.
Desmodromic mechanism ball bearing 7
At a temperature of approximately 150° C the ball bearing co-
mes out of its seat almost spontaneously.
If necessary, hit the crankcase half against a flat wooden board.
Insert the new bearing and push it to the correct level.
Gear shaft needle roller bearing 8
Push in the bearing from the outside.
Insert the new bearing, pushing it from the inside to the correct
level.
– When the crankcase is cold, ensure that the bearings are
firmly seated.
1
3
8
7
2
6
4
5
8
7
WARNING: To avoid burns, be sure to wear protective
clothes when using the oven.
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