Valkyrie

Just want to see if someone can tell me if these housings can be reworked (lapped or reground) or if they need to be chunked.

Minnionator

the plates look burned and the housing chrome is pooned beyond repair. short answer- no.

longer answer, break out your measurement tools and follow the FSM or haynes manual that tells you how to check the flatness of the plates and the correct shape for the housings...i wouldnt reuse any housing with more than 150xxx kms on it, and thats presuming its already in good shape and can be re-lapped without major chrome flaking.

Icemark

The housings are good candidates for Cermat, but the plates are shot and not sure if they could be lapped enough, to make them work

Valkyrie

I'm also wondering WTF caused all the burning, since my OMP seems to be working fine. The chrome definately has a combination of chatter and parallel streaks, but it basically feels smooth except for the burnt parts. I was thinking about seeing if JHB could grind them, since it's much cheaper than getting Cermet (and I don't want to put *too* much cash into an engine when I want to go turbo someday anyway).

I don't think the side housings were ever lapped, so I can't see why I couldn't get just a bit more taken off than normal and have them work OK. I can feel some edges but I don't have a dial indicator at the moment. I *really* don't want to have to Cermet the side housings too, since the prices are kind of ridiculous compared to getting the rotors done.

Then again, the car ran fine with them in this condition... didn't flood, pulled hard, decent gas mileage (at 150,000 miles). And it started reliably, although the idle tended to fluctuate for whatever reason.

I haven't even checked the apex seals yet... but they shouldn't be more than 40,000 miles old.

OTOH, Mazdaspeed says to always replace the corner seals, but if they're tall enough, couldn't I just replace the rubber plugs and springs?

My rotors were pretty badly carboned for that matter, but nothing 4 dollars worth of emory paper and 10 dollars of diesel fuel couldn't fix.

Well, I'm just going to take them with me to Mazmart sometime this week and see if they're lappable...

If I had to guess, I would think the rotor housings would be useable if just a wee bit of chrome was machined off, to get rid of the burning and chaffing. There's basically no flaking.