Hello,
I am rebuilding a 12A engine and one of the rotors is out of tolerance.

The Apex Seal/ Rotor Groove clearances are well over 0.006.

Can I use a brass mallet and piece of wood too hammer the Rotor Apex Groove clearance back to spec?

Are rotors ductile enough to take this kind of abuse?

I am thinking that I have nothing to lose and everything to gain.


Mr. Y

 

What are your other options?

 

My other options are to buy a replacement rotor.

Thankyou

 

That will not work. Place a classified add for a used one.

 

if it is in your budget, you can have the rotors machined for wider seals

 

are you serious?

 

I will let you know what happens

 

Maybe 5mm seals are still available?

I have lightly touched up a rotor after getting dropped, and had no problems. You just have to make sure that the corner seals still slide cleanly and that the apex groove is straight. This would not be easy if you had to clean up the entire groove.

If I pull an engine apart and the apex grooves are V shaped, they're just junk. Usually when the engine gets to that point there are no useful parts in it anyway so the little pieces get saved and the rest is scrapped.

 

i know other people have done this.

key is to measure the groove very carefully, they dont V straight. also like pj says, you cant go too far or the corner and side seals wont fit.

the rotors are actually kind of soft, and fragile.

imo you'll end up with a rotor thats almost in spec....