Is it possible to repar a rotor that was damaged by destruction of the apex seals? I have an s5 rear rotor that is damaged. Could the damage be smoothed out by remilling the apex seal grooves, and filling or milling the faces? I will try to get pics of the damage tomorrow.



Thnx

Andy

thats when u go 3mm https://www.nopistons.com/forums/pub...DIR#>/wink.png

Good idea. https://www.nopistons.com/forums/pub...#>/biggrin.png



Atkins 3mm seals are cheaper too. Are there any problems associated with using 3mm seals in a DD?

no problems that i know of using 3mm for a dd. but i don't know if you had est. the pricing for the rotor work, 3mm seals, as well as the rest of the gaskets and/or replacement parts needed for rebuild. make sure you research before diving in.

i personalyl dislike the 3mm seal, but if its a rare rotor such as an FD and you dotn have money to get new ones and cant find any used around then 3mm might be your best bet even with machining of the rotors.



do a search on teh 3mm subject to see if its somehitng you are ok with

OK

." Is it possible to repair a rotor that was damaged by destruction of the apex seals?"



Yes it is possible..with the proper milling tools & maintaning tight tolerances and similar to the other rotor.



Remeber mazda first cast the rotors then they machine them while maintaning tight tolarance such as .005 also if there is even enough material to work with in order to keep it 2mm.. actually the apex seal with is 1.92 mm ..but mazda uses 2mm to make it a easier sell/catologing.



Then the engine or should i say rotating assembly should be rebalanced since there was material removed from one rotor thus changing it mass (weight).



Engine balancing is an old secret of engine builders, that always gets overlooked.



Also milling the apex seals grove on the rotor to the older 3mm size is not advisable. ..first of all the same procedure that i mentioned above , rebalancing, tight tolerance, must be applied when moving to 3mm from 2mm, but you you are not done yet...There is allot of heat that will get absorbed by the ROTOR while its machined to 3mm from 2mm.. The rotors "white iron" blend will go through a phase change thus weakening the material around the apex seal grove.



The area around the apex seal should always maintain its integrity in order to minimize apex seal play within it.



Also the sealing charactaristics of 2mm seals are far superiour than 3mm while creating less drag .

The sintered iron blend in newer apex seals are far better that old seal material.

Also less rotating mass on the rotors is benificial.



There are a few other reasons why not to repair the rotors or mill to 3mm but .....i would just get a used one.



Oops i think i went a little to the extreme edge ..



God Bless.

I have access to some pretty big machine shops at CSM so the milling and stuff wouldnt be too difficult, but rebalancing everything might be a little out of my league. Meh, I guess I'll just try to find a used one.

Some Pics of the damage:



This seal seems almost welded into its groove.

Here is the worst damage on the rotor face.

Is this rotor coloration normal? I didnt think they were supposed to be so dark inside of the side seals. Is this massive blowby at work?



The rotor on the right doesnt have any obvious damage, do you think it would be useable after a good cleaning?