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Front Cover O-Ring difference

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Old 05-02-17, 08:57 PM
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Front Cover O-Ring difference

Anyone know what the differnce between these two front cover O-rings are?
Both are from atkins, one came with the front gasket the other I purchased separately.




Old 05-03-17, 10:18 AM
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Are they the same size? And is that the metal front cover gasket?
Old 05-03-17, 10:22 AM
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That's for the paper front cover gasket. If you have time, order a metal front cover gasket. You don't need an o-ring with it, just make sure both surfaces are clean (no little gasket bits), throw the metal gasket on, and install the front cover.

Paper gasket you want a SUPER thin smear of grey RTV on then use the oring and teflon spacer. I would use the whiter of the two, that's the Mazda part, the other may be one they are sourcing from somewhere else. It's the upper/left-hand one in both of your pics. Finally, when the front cover is on, you use a razor blade to trim the little bit of gasket that sticks out the bottom.

I had a number of front cover issues on my FC back when I built my first motor. This is something you want DEAD RIGHT, pulling a front cover in the car is the biggest pain in the *** possible.

Dale
Old 05-03-17, 02:15 PM
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metal gasket with or without sealant?
Old 05-03-17, 03:31 PM
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No sealant on metal gasket. Both surfaces clean, install and torque front cover to spec.

Dale
Old 05-03-17, 10:14 PM
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you might want a dab of sealant at the corners where it meets the oil pan
Old 05-04-17, 12:02 AM
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Originally Posted by DaleClark
That's for the paper front cover gasket. If you have time, order a metal front cover gasket. You don't need an o-ring with it, just make sure both surfaces are clean (no little gasket bits), throw the metal gasket on, and install the front cover.

Paper gasket you want a SUPER thin smear of grey RTV on then use the oring and teflon spacer. I would use the whiter of the two, that's the Mazda part, the other may be one they are sourcing from somewhere else. It's the upper/left-hand one in both of your pics. Finally, when the front cover is on, you use a razor blade to trim the little bit of gasket that sticks out the bottom.

I had a number of front cover issues on my FC back when I built my first motor. This is something you want DEAD RIGHT, pulling a front cover in the car is the biggest pain in the *** possible.

Dale
Thanks for the response Dale,

(EDIT)
Where can I find a metal front gasket?

Also should I maybe look into ordering from ray crowe?
Old 05-04-17, 08:52 AM
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Atkins Rotary has the metal gasket. I think it's a non-US item so Mazda USA doesn't have it.

It's like $40 last I saw.

Dale
Old 05-04-17, 09:02 AM
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The RX8 Gaskets are metal and work with the FC front cover, Not sure about FDs. That's what I ordered from atkins. Also I smeared a layer of permetex anaerobic gasket maker on both the front cover and the front Iron.
Old 05-04-17, 04:25 PM
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Originally Posted by 13bREW
The RX8 Gaskets are metal and work with the FC front cover, Not sure about FDs. That's what I ordered from atkins. Also I smeared a layer of permetex anaerobic gasket maker on both the front cover and the front Iron.
The Rx8 Front cover gasket "does not" fit the FD because 2 or 3 holes are not aligned properly iirc . I think it would be stupid to use it over the FD metal gasket.

The good thing about it tho is..
Front Cover O-Ring difference-photo78.jpg
Old 06-10-17, 06:56 PM
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I purchased the front metal gasket, thanks for the advice everyone!

If anyone is having a hard time finding it I noticed its sometimes referenced as the cosmos 20b metal front cover.
Old 06-10-17, 07:12 PM
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Originally Posted by Moe Greene
I purchased the front metal gasket, thanks for the advice everyone!

If anyone is having a hard time finding it I noticed its sometimes referenced as the cosmos 20b metal front cover.
it is an N390 part number, so since an N390 is a Cosmo part number (2 rotor, 3 rotor is an NF01) we refer to it as a Cosmo part, and it is.

the Cosmo came with a paper gasket until 12/1995, when they switched to this metal one, and the FD switched to this same part at the same time.




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