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Derby cover. Gasket or o-ring?

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Old 04-13-2012, 09:44 AM
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Default Derby cover. Gasket or o-ring?

In preparation of pulling my outer primary off so I can polish it, I bought an outer primary gasket, derby cover gasket and inspection cover gasket (where the shifter shaft passes through). When I pulled everything off, the derby cover had an o-ring and not a gasket. Should I reuse or replace that or, use the gasket. My TC has a gasket and seems to work well but, it's got five screws holding it on whereas my Evo only has three.
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Old 04-13-2012, 10:04 AM
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I would say use the gasket one for the Evo. It has a ring of RTV to secure the seal. I always put some extra RTV on this gasket on the bottom portion at least, when I install it, and it never leaks that way.

The 3 screw thing is imperfect.

RTV is a MUST for evo owners!!
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Old 04-13-2012, 10:10 AM
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I would say use the gasket one for the Evo. It has a ring of RTV to secure the seal. I always put some extra RTV on this gasket on the bottom portion at least, when I install it, and it never leaks that way.

The 3 screw thing is imperfect.

RTV is a MUST for evo owners!!
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Old 04-13-2012, 10:45 AM
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Mine has both. There is the o-ring around the actual derby cover, then the gasket that covers the entire hole and has one side that says :this side towards clutch". Ironically the first time I removed it I was missing the gasket as well.
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Old 04-13-2012, 11:49 AM
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I use the oem gasket and no sealant.
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Old 04-13-2012, 01:31 PM
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Quote:
Originally Posted by Bleachey View Post
Mine has both. There is the o-ring around the actual derby cover, then the gasket that covers the entire hole and has one side that says :this side towards clutch". Ironically the first time I removed it I was missing the gasket as well.

thats what I do. Just leave the O-ring in there and replace the gasket after it gets looking ratty.
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Old 04-13-2012, 03:25 PM
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I knew I could count on you guys. Getting used to the Evo has certainly been a learning experience and this forum, and it's members have made this thing a whole lot easier. Thanks again.
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Old 04-13-2012, 03:42 PM
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I`ve had the same o ring in my primary cover for at least 10 years, derby cover has been off dozens of times, does not leak a drop.

RTV?????
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Old 04-13-2012, 03:43 PM
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thats what I do. Just leave the O-ring in there and replace the gasket after it gets looking ratty.
You do have to make sure the o-ring is seated in the groove really well. The first time I buggered mine up because it wasn't in the groove and it leaked. When I removed the cover I realized the o-ring had slipped out of the groove and it was smashed. Couldn't see it with the cover on.
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Old 04-13-2012, 04:24 PM
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The new gasket is ****. MoCo felt the need to have some egghead redesign something that worked. When removing your durby covver be sure to mark it with a wax pencil or sim. They are almost allways warped and you should try to put it on the same way it came off. With my bike I allways reuse the o-ring or it will leak, and as above RTV is a must and she will be tight as a drum.
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