Why won't the rear rotor come off?




This is the first engine I rebuilt about 7 years ago. 13B 4port, 12A irons SE housings and internals. I ran it in one of my RX-4s for 3+ years. Then put it in my Cosmo (no oil pressure gauge). It ran great for a year until one day, while running at 70 mph, it slowed to a stop. Never to turn again.

 

seized due to lack of lubrication.

 

I should have mentioned that Wacky and Jeff should wait a day or so to let everyone else guess.

 

Spun rotor bearing?

Jon

 

^ +1

 

It is not put together?

 

 

The bearing/bushing from inside the rear stationary gear is fused to the E shaft. Wacky is right. No oil showed on the dip stick after it died. Not sure how I let that happen. I never noticed any obvious oil leaks and I've run several Rx's low on oil before catching it. The rear housing looks like it's ok. We'll see when I take some measurements. The temperature never showed hot, but the gauge is 1976 vintage. I was interested to find that the front thrust bearings (new when I rebuilt it) appear to be in perfect condition. I'll see what the rest of the parts look like tomorrow, when I figure out how to get it apart. The rear rotor won't slide over the fused bearing.

 

Left=Bad--------------------------------------Right=Good

 

no oil in the pan?? dang bro, never rely on the stock gauges Thats how I blew a newly built engine in my 74 RX-4 years ago.

 

I just now saw this post. Your Cosmo is the same color as mine.

Take a dremel with a cutting disc or a die grinder and cut the bearing off. Maybe the rotor is still good? I was able to harvest one rotor out of a Hayes engine that spun a front bearing due to oil starvation from a pickup tube that fell off the engine. It was just laying in the pan when I pulled it. The rotor bearing is a bit worn but at least the rotor is salvageable.

 

Came off with a coal chisel and a few taps. came apart at the "puzzle splice". Rear rotor and both housings look OK. Front rotor, middle housing and E shaft are gone.

Here's the Bearing and front rotor lobe.


front rotor damage



front of the middle housing
Like that smooth port job? It was my first attempt. Not pretty, but worked fine.



Oh well I got 5 years and around 50k miles from 4 old engines. Cost me around $700 with the new soft seals and I learned how to rebuild a rotary. Could have used that knowledge back when I bought my new RX-3 in 73 and proceeded to ruin 3 engines in 5 years.

BTW more pics of the cars are here.
http://intertron.com/ron/

 

Nice airdam...just like mine.

 

Check this thread for my wonderful experience with an oil starved engine. https://www.rx7club.com/1st-generation-specific-1979-1985-18/another-one-bites-hayes-dust-658456/

 

WOW!
Nice ridez Wacky!

 

Yeah, the pictures I've seen of Wacky's 3s make me miss the Rx-3s I've had. No need for pity, I have a couple FBs, 2) RX-4s and the Cosmo now. Needless to say I have very little money left for anything other than Mazda parts.

 

I can attest to his collection, this car now is my second from him

 

i had a front stationary gear bearing seize to my Eshaft with only 130 miles on the motor...i think something happened with my oil pump. It was a blessing in diguise though i was able to do the $190 RX8 eshaft instead of the almost $500 stock one