I recently rebuilt my 12a with lapped plates, new seals, springs etc and two nice housings. On a bench test using a bell housing and a starter I got 110psi on all 3 faces on rotor one and nearly the same on housing two maybe 105psi.



Everything looked great until I started the engine and heard a clunking noise. I lost all compression on rotor 1. After tear down it turns out that somehow the rotor came into contact with the housing!!!, It bent the tips of the rotor enough to hold the apex seals in so tight I had to hammer the seals out! The front stationary gear also showed damage, a little chewed up.



So I humbly admit I must have made a mistake but I just can't figure out how this could be possible. All the bearing are original, and the motor did run smooth before the rebuild but had oil and coolant leaks. Weirder still is that this housing is the original housing from before the rebuild.



Has anyone ever seen a rotor his the housing? Hows that possible?

 

Is the front stationary gear still stationary?

 

I don't understand how that is possible.