Yeah, so there is this line or grove that catchs your fingernail. You can see the trace of it in the pictures.

I am guessing that is corner seal wear?

I should have a magnetic base dial caliper next week. But in the mean time....like the rotor housings....if it catchs a finger nail...is it done?




James

 

Isn't that from side seal wear? Not sure...

I noticed I have one line like that in my front iron in the same spot. Its enough to catch a finger nail too. I wasn't too sure so I just used a different iron with less wear. But would still like to know if something like that is useable.

 

If it's a scratch i don't know what to tell you... but if it's light it should be fine, but if it's regular wear... In the factory service manual they have wear tolerances for that area. You can also use the haynes manual... the tolerances are the same. Use the guage you're getting or a good straight edge and a set of good feeler guages. My housings caught my nail with only 90k on them... i checked mine against specs and they're fine after 2500 miles.

 

So when you say housings .....did you mean rotor housings or the iron?

There are indeed tollerances for that area. I need to get that magnetic base dial caliper to check em....

James

 

Up

 

Thats the normal corner seal wear point... however... it looks pretty deep...

its .0039 in that area max.... for now, you can take a .003 blade and but it up against the low side of the groove... if there is still a drop as you trace from outside in its real close... if you have to jump up to get on the blade, probably good... this is a quick check, should always use the gauge on a base to be sure

If the housings have not been resurfaced, you should be able to have your housings lapped.... you need to get another spacer though cause the engine will shrink from front to back by a few thousandths (well, exactly the number of thousands are taken off the irons during lapping)

there is a problem in getting the combustion seal grooves to shallow if the housing has been lapped to far.... the newer Teflon encapulated seals may bind if the groove isn't deep enough and not allow the motor to mate together properly or bust the groove wals out into the water jacket...

 

IF you're on the quest to build a perfect engine, then that might not be something you want to use. For the average amateur rebuild street engine intended to last 100k miles, that is fine. You won't incur any significant problems by using a housing with more-than-spec wear there. The rotorhousing surface is much more critical to compression and longevity than the side sealing surface.

 

Thanks for the info Kevin. My goal here is a 300rwhp. Maybe I am treading thinnly?

Years - I tried what you suggested. I could not get my .004 feeler to catch. Nor could I get my .0025 feeler to catch. I guess it looks worse than it is?

I am going to have a magnetic base dial gauge soon for the final rundown though.

James

 

Weee

 

Weeee

 

"^

 

 

I'm confused as well. The great Kevin has spoken, what else needs to be said? LoL

 

You , that is a damn good point My bad....