1985 GS 12A - OMP failed causing engine seizure. I took it to my mechanic who knows rotary engines, I bought the car from him actually. He rebuilds the OMP with a kit, and replaces the rotor bearings, and then reinstalls it and the engine. Then says the engine is running hot and lean. He then says he thinks some apex seal springs may have been damaged so he ordered more to replace them, I am assume 6.

Then I think to myself, if oil wasn't going into the engine weren't those rotors scraping against the housing? Don't lots of things need to be replaced, and God forbid the rotors or housing is damaged? I mean, since the engine was taken apart, wouldn't you want to go ahead and replace the apex seals anyway? Not put it all together to just have to take it all apart again?

My question is, with an OMP failure causing an engine seizure, what would you think needs to be replaced/checked? How would you go about it? I'd like to gather some info to have for the next time I speak with him. As you can tell, I am new to rotary repair. I just recently purchased the car from him so he feels kind of obligated to fix it for me. The thing is, I don't want a pity repair. I want the thing fixed proper. I'm not saying he doesn't know what he is doing. I just wonder if there there should be more to it.

 

Omp only oils the combustion chamber by mixing oil with the fuel. If the main bearings were wasted that would be main oil pump inside the engine. Omp failure causes excessive wear or failure of all the seals on the rotors and sealing surfaces on the irons and rotor housings. I think you should take it to another mechanic sounds like he taking you for a ride/ripping u off.

 

replacing rotor bearings is a complete engine tear down and rebuild. is that what he did?

 

are we sure its an oil metering pump and not an oil pump?

 

New info from the mechanic: "The OPM did not fail, it was just leaking. The rotor bearing were starved of oil. The stationary gear bearings are good. The apec seals were fine, just a spring issue."

This new info, does that make sense? Maybe it does. I am not so versed in this engine.

 

Apex seal spring ? Side seal spring ? Oil regulator spring ? Front cover spring? Therno pellet maybe?
​​​​​​Starved of oil is not a good thing for the rotors. The oil is what cools the rotors. There would be more damage than just bearings.