Primary plug o-ring and derby seal
Elite HDF Member
Joined: May 2008
Posts: 4,579
Likes: 10
From: S.E. MO
Just depends on what kind of shape they are in and how often you do fluid changes.
I reused my o-rings at 1000 mile service since they all looked new. I replaced the derby cover seal even though it looked good. At 3000 miles I changed fluids for my Chrome Motor package install and crankcase o-ring was pretty wore looking, the rest still looked good but replaced them anyway.
I reused my o-rings at 1000 mile service since they all looked new. I replaced the derby cover seal even though it looked good. At 3000 miles I changed fluids for my Chrome Motor package install and crankcase o-ring was pretty wore looking, the rest still looked good but replaced them anyway.
Last edited by bberck; Aug 23, 2008 at 03:27 PM.
Club Member
Joined: May 2006
Posts: 10,815
Likes: 16
From: Virginia
I replaced the o ring but reused the gasket. I have taken the derby cover off a few times and have just reused the stock gasket everytime. I'll probably use the new one I have in the garage next time. Don't wanna keep pushing my luck.
Club Member
Joined: May 2006
Posts: 14,564
Likes: 9,225
From: the 50s & the 60s
Reuse both, if they're good.
oRings are fifteen cents each.
mud
Tourer
Joined: May 2008
Posts: 288
Likes: 21
From: North Carolina
I replace the o-ring after every third service. They will leak after a few changes ... as me how my skeptical *** knows this. 
That said, however, I kinda' like the fact that my FX is now marking his spot like my old shovels used to do.
That said, however, I kinda' like the fact that my FX is now marking his spot like my old shovels used to do.
Road Master
Joined: Nov 2007
Posts: 1,021
Likes: 12
From: Greene County, MS
I reused my orings on my last oil change even though they looked pretty bad. I didn't have much choice....I didn't have anymore. No leakage though. This time I have new orings to use. The derby cover gasket looked fine and I reused it.
Road Warrior
Joined: Apr 2007
Posts: 1,641
Likes: 156
From: florida
I replace the O rings every time, also put a dab of teflon paste on the threads. I changed the derby cover to a custom cover and it uses a different gasket then the stock cover. Don't know if its re-usable or not. Hope it is cause it's $7.00.
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