Vespa Pre 1979 Large Frame Engine Work
Bearings - Rear Wheel
Rear Wheel Bearing
There are two rear wheel bearing set ups
on older casings. On the left is the later system which uses a circlip
to retain the bearing. This system started (as far as I can tell) with
the VBC1M motor from the Vespa 150 Super and is in use today on all the
P series motors. The one on the right was used up to the VBB2M motor
and uses a reverse threaded retaining ring and a small wire clip to
keep the bearing retained. Unfortunately, so far, I only have step by
step info on the newer type.
Once the transmission has been removed
and the rear wheel oil seal has been pried out, the rear axle bearing
is visible. You will also see the circlip that retains the bearing.
Remove the circlip with circlip pliers.
This then allows the bearing to be knocked through the casing from the
I'm lucky enough to have the original
Piaggio tool to drive the bearing from the casing. You can also use
some sort of steel pipe as a drift to knock it out. If it is very
stubborn you can heat the casing to release it's grip on the bearing.
Once the bearing is out, a new 6204
bearing can be driven in to the casing. Heating the casing is a great
help before driving the bearing in with a socket or similar thing.
Make sure the bearing seats all the way
past the groove for the retaining clip. Insert the retaining clip and
...fit the oil seal firmly in place.
Sometimes a large socket is helpful to gently tap it all the way home.