Vespa Small Frame Engine Work
Clutch side oil seal
There are two oil seals that are located on either end of the crank. These allow the crank to rotate through them but keep the primary compression pressure from leaking out to the transmission or the stator area.
You will need:
You will need to remove your crank to gain access to the seal.
The easiest way to remove the seal is with a large screwdriver but care must be taken to not damage the main bearing behind. Another way to get it out is with a 90 degree hook tool. Either way, you may damage the seal, but you are replacing it anyway so it is no big deal.
The new seal is a press fit into the aluminum casing. The seal must be fit with the spring and lip facing towards the crank as shown above. Set it in the hole and squarely push it into place. It will be almost flush when fitted properly.
The image above shows the lip pulled back to show the circular spring location.
Once you are finished the seal should look like above and you are ready to reinstall the crank.