3rd Generation Specific (1993-2002) 1993-2002 Discussion including performance modifications and Technical Support Sections.
Sponsored by:

Front Cover O-Ring difference

Thread Tools
 
Search this Thread
 
Old May 2, 2017 | 08:57 PM
  #1  
Moe Greene's Avatar
Thread Starter
Senior Member
iTrader: (2)
 
Joined: Aug 2016
Posts: 376
Likes: 12
From: Colorado
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.




Reply
Old May 3, 2017 | 10:18 AM
  #2  
Sgtblue's Avatar
Urban Combat Vet
Tenured Member: 20 Years
Liked
Loved
Community Favorite
iTrader: (16)
 
Joined: Oct 2003
Posts: 12,159
Likes: 982
From: Mid-west
Are they the same size? And is that the metal front cover gasket?
Reply
Old May 3, 2017 | 10:22 AM
  #3  
DaleClark's Avatar
RX-7 Bad Ass
Tenured Member: 20 Years
Liked
Loved
Community Favorite
iTrader: (56)
 
Joined: Jan 2002
Posts: 15,622
Likes: 2,723
From: Pensacola, FL
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
Reply
Old May 3, 2017 | 02:15 PM
  #4  
neit_jnf's Avatar
Eats, Sleeps, Dreams Rotary
Tenured Member: 20 Years
iTrader: (17)
 
Joined: Apr 2003
Posts: 4,056
Likes: 261
From: Around
metal gasket with or without sealant?
Reply
Old May 3, 2017 | 03:31 PM
  #5  
DaleClark's Avatar
RX-7 Bad Ass
Tenured Member: 20 Years
Liked
Loved
Community Favorite
iTrader: (56)
 
Joined: Jan 2002
Posts: 15,622
Likes: 2,723
From: Pensacola, FL
No sealant on metal gasket. Both surfaces clean, install and torque front cover to spec.

Dale
Reply
Old May 3, 2017 | 10:14 PM
  #6  
j9fd3s's Avatar
Moderator
Community Builder
Liked
Loved
Community Favorite
iTrader: (3)
 
Joined: Mar 2001
Posts: 31,796
Likes: 3,210
From: https://www2.mazda.com/en/100th/
you might want a dab of sealant at the corners where it meets the oil pan
Reply
Old May 4, 2017 | 12:02 AM
  #7  
Moe Greene's Avatar
Thread Starter
Senior Member
iTrader: (2)
 
Joined: Aug 2016
Posts: 376
Likes: 12
From: Colorado
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?
Reply
Old May 4, 2017 | 08:52 AM
  #8  
DaleClark's Avatar
RX-7 Bad Ass
Tenured Member: 20 Years
Liked
Loved
Community Favorite
iTrader: (56)
 
Joined: Jan 2002
Posts: 15,622
Likes: 2,723
From: Pensacola, FL
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
Reply
Old May 4, 2017 | 09:02 AM
  #9  
13.bREW's Avatar
dont kill the cones
Tenured Member: 20 Years
Liked
 
Joined: Dec 2004
Posts: 361
Likes: 1
From: Kennewick, WA
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.
Reply
Old May 4, 2017 | 04:25 PM
  #10  
7krayziboi's Avatar
endless build
Tenured Member 10 Years
iTrader: (15)
 
Joined: Nov 2013
Posts: 1,140
Likes: 26
From: Canada , Alberta
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
Reply
Old Jun 10, 2017 | 06:56 PM
  #11  
Moe Greene's Avatar
Thread Starter
Senior Member
iTrader: (2)
 
Joined: Aug 2016
Posts: 376
Likes: 12
From: Colorado
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.
Reply
Old Jun 10, 2017 | 07:12 PM
  #12  
j9fd3s's Avatar
Moderator
Community Builder
Liked
Loved
Community Favorite
iTrader: (3)
 
Joined: Mar 2001
Posts: 31,796
Likes: 3,210
From: https://www2.mazda.com/en/100th/
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.
Reply




All times are GMT -5. The time now is 11:52 PM.