mazdaspeedrex

Does anyone know if the cleaning agents in a hot tank parts cleaner harm the coating on the rotor housings.

I also heard of an old trick to help stuck apex seals. While the car is running at about 2-3K rpm pour a little ethylene glycol down the carb and it will help the seals and springs work better. Anyone else heard of this and is there any truth to it?

Rex4Life

I'm sure it won't hurt anything, isn't the glycol what the sub-zero tank injects?

mazdaspeedrex

Yes, that's how the older 12A's got enough compression to start. This guy just started working for me part time and he used to work at a Mazda dealer in the 70's and 80's. He was surprised to see my 7 outside the store and someone who knows some about them inside. He was telling me the stuff they used to do to keep the old rotaries running.

Wankelguy

Amsoil "power foam" works well for freeing up stuck apex seals. So does Techron.

If the hot tank solution is safe for aluminum, it should not damage chrome.

mazdaspeedrex

Got it cleaned today. It worked great. Much better than trying to clean it by hand with a brush and degreaser. Do you put the Techron in the gas or straight down the carb?

Wankelguy

A couple of tablespoons of Techron hand-cranked into each rotor's intake will do the trick. With Techron, you leave it sit for at least a couple of days, up to a week. Make sure the stuff gets on all sides of the rotor. The good thing about Techron and power foam is that they are basically made for this purpose and won't damage catalytic converters or exhaust components. You can also put Techron in your fuel to help control the accumulation of carbon.

There's my 1000th post!