1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

12a Rebuild: Apex Seal Distortion

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Old 07-18-14, 01:47 PM
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12a Rebuild: Apex Seal Distortion

12a Rebuild continued....

Finally got everything cleaned and measured.

Measured apex seal distortion on all 3 combinations of pairs:
Front: at least .178mm
Rear: at least .152 on one pair, at least .178mm on other two pairs.
Limit is .06mm

Measured apex seal height: 7.9mm +- .1mm on all 6
Limit is 7mm

Should I replace the apex seals?

There is a big price difference between the Atkins brand and the Mazda OEM from Mazadtrix. May I assume with the age of my rotors and irons the Atkins (soft) are more preferred?

Jeff answered some of my other questions in this recent thread:
https://www.rx7club.com/1st-generati...tions-1067784/
Thanks Jeff.

Compiling my shopping list.
Old 07-18-14, 05:39 PM
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since new apex seals are around 10mm, i think i would replace.
Old 07-18-14, 08:43 PM
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Originally Posted by j9fd3s
since new apex seals are around 10mm, i think i would replace.
Thanks.
That's my sense at this point.
I have a feeling that even though it was suppose to be a rebuilt 30K ago, most of the hard pieces are original.

Time to do it right.
Old 07-19-14, 12:33 PM
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Originally Posted by TimWilbers
Thanks.
That's my sense at this point.
I have a feeling that even though it was suppose to be a rebuilt 30K ago, most of the hard pieces are original.

Time to do it right.
i forget if you said atkins or hays, but 10 years ago, they were known for using more spray paint than new parts...
Old 07-19-14, 12:55 PM
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Originally Posted by j9fd3s
i forget if you said atkins or hays, but 10 years ago, they were known for using more spray paint than new parts...
Atkins rebuilt.
I have the docs from the shop that installed if for my dad.
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