I'm in the process of pulling my H22a apart to replace the piston rings and head gasket. I noticed that my pistons and the cylinder walls had some weird wear marks on them. Does any body know what might be causing this or how to fix it? Thanks I greatly appreciate it.

 

Looks like general scraping.

 

nothing lasts forever

 

dont try and hone that out... looks normal but does your finger nail catch on the grooves?

 

Now would be a great time to sleeve it.

 

Yeah I can catch my fingernail on them but just barely.

 

Bump

 

are you planning on resleeving it at some point? if so...

or you can hone it and get new piston rings

 

I wasn't going to re-selve it if I didn't have to. I remember someone telling me that these FRM walls cant be honed or can be honed very little but i'm not sure if that is correct. Also should I then get oversized rings for the pistons if I hone it?

 

as much as you're going to hone it, yes. talk to a machine shop that knows how to hone FRM sleeves. do not go to one that doesn't. you'll pay for it down the road

 

Yea I took it to someone who said they could hone them, and they royally Fu*ked my block up. In the end I had to pay for the hone and the sleeve. I'd call Sunnen and ask them. They told me a way to properly hone them. They said to use a special graphite stone and finish with some silicone polish. I lost the number for the stone and polish though. You want FRM to be polished smooth unlike cast iron honing where you want a nice cross hatch. Not many people even know what FRM is. Most will tell you it's Nikasil... which I'm pretty sure it's not the same.

 

I hate FRM sometimes.... Id sleeve it

 

sleeve it