I have a 20b thin iron that I was hoping reuse in my build. While taking the water seals out of the grove, I noticed what seemed like caked carbon coming out of the grove along with the seal. Turns out the inside edge of the inside water groove has corroded and broken away upon disassembly, leaving a rough and angled wall. I was originally planning on having this plate surfaced (since it has some raised corrosion areas on the plate surface) but now I'm wondering if I should just scrap it. I couldn't find a spec for this in the FSM and all of the pics/advice for water jacket corrosion are on the outside edge of the inner groove (and for full failure of that wall). Additionally, the distance between the line where the rotor housing covers the side plate and the seal groove itself seems pretty large, so I'm wondering if it may be a non issue.

Is the TurboRX7.com > Criteria For Replacement of Rotary Engine Parts check 2.D.c the correct limit for the width or depth of the water seal groove?

Face of the iron in question


Corroded corner (top, opposite intake port)


Same face, opposite top corner


Thoughts?

Thanks,

 

You'll be fine. The link appears to refer to the width of the corrosion. That's what fretting is anyway. Corrosion and cracking.

 

Run it ... not before you get those surface redone.....