I didnt kno that MMO was harmful to rubber. When attempting to free up one of my seals i used the mmo in the chamber trick, but i used a syringe setup, without the needle. I left a little extra mmo in the syringe shooter thing and today i noticed it, and emptied it. When i noticed the rubber boot on the pusher was sticking. So after some work i got it out. I was deteriorating, and very very grippy. I cant get it back in the syringe without putting water or spit on the sides of the housing. I gotr another one, same exact brand and all. Looked at the rubber plunger thing and its a smooth rubber. Man mmo fucked up that rubber boot. Is this common knowledge and im just way behind, or is this news to everyone?

 

Never knew that, but thanks for the heads up man!!!

 

My 20B is the only engine I've ever put MMO in (sticking apex seals). I'll test fire it soon. I wonder how much smoke it'll blow?

 

There ARE different kinds of rubber compounds, so hopefully the 12A isn't built with that syringe rubber for seals...

 

You may want to get that checked out.

I also hear ethanol gasoline will do the same thing to rubber.

 

I kept a large syringe in the car with ATF just in case. After a week the rubber swelled up to the point that you couldn't push/pull the syringe at all.
Bet it's the rubber in the thing not designed for these chemicals..

 

Any gasoline with or with our ethanol will do that to rubber. Rubber is an organic (chemically organic) compound gasoline is an orgainic (agian chemically orgranic) solvant, therefor the gasoline solvates the rubber. The alcohol (ethanol) is not an organic solvent, it will not disolve the rubber.

That is why the rubber side molding below the fuel door is falling off on all our cars (that have side moldings) the gasoline disolves the adhesive.

Any way long and the short of it is the ethanol portion of the gas is not what attacks the rubber.

regards

anthrax

 

Any gas or oil will either make the rubber deteriorate or swell it up, unless the rubber is specially made for the application. When I moved my oil cooler to in front of my rad, I had to lengthen the lines. I had to be careful of what kind of rubber lines I used. I ended up using oil resistant air hose. The kind used for air tools. So far it is working great. I have had oil sitting in the lines for a week or so and they haven't swelled.

 

MMO in my oil system took out my Oil Control Seals - true story.

It's been documented here that MMO is good for apex seals, carbon disolving, and general lubrication of the inside of a rotary engine, but that's through the FUEL. If you read the MMO label, it states that you can add it to the oil system as well (1 qt for 1qt of oil displaced at your next change), and I tried it. Boy, do I regret it now.

The MMO attacked the Oil Control Seals on the rotors and either ate away all the carbon that was sealing these to the engine side housings, or damaged the seals themselves. The result is cold start oil smoke that makes a James Bond smokescreen whenever I drive off until the engine gets up to temp. Once there, the expansion of the rotors seals up the Oil Control O-rings again, and the engine runs fine.

Upside is that I never have to worry about poor apex and side seal lubrication at startup - I've got PLENTY!

MMO is fine in gasoline, but keep it OUT of your oil system...

 

Ah.