Steve20b

Hi all, rebuilding my Cosmo's 20b engine. Stripped her apart, sourced a secondhand rotor and housing and are beginning to assemble it. With the rotors being 120 degrees apart how can you be sure they are located correctely on the stationary gears? Are there locating dimples on the rotor that line up with a tooth on the stationary gear? I know there must be an easy way. At least with a 13b the rotors are positioned exactly oposite to each other, easy to position but with 3 rotors how can you be sure you're getting them in the right position.

Cheers

j9fd3s

thats a good one! id imagine the 20b rotors also only go one way too....

hsmidy

yep as he said there is only 1 way they will fit in,with the rotor housing on and lowering in the rotor onto the e-shaft it will only fit in one way, hope that helps mate

Steve20b

I didn't think there would be much too it, but had to be sure. I thought the lobes on the e-shaft would dictate position. There are paint marks on the stationary gears but nothing on the rotor, that sort of threw me. Well I will be putting it back together in a couple of weeks just got to get the plates surfaced, so will let you all know. Cheers