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Explanation: O-rings found in the Seat Slide Assembly (long)

To: Triumphs@autox.team.net, 6pack@autox.team.net
Subject: Explanation: O-rings found in the Seat Slide Assembly (long)
From: corey.sherman@rcn.com
Date: Mon, 19 Feb 2001 09:27:41 -0500 |December 14, 2000) at 02/19/2001 09:27:44 AM, Serialize complete at 02/19/2001 09:27:44 AM
Cc: <sandner@attglobal.net>
This should be a trivia question on "Who wants to be a... Triumph Wiz." 
For all those wondering, here's an explanation. Glad to see a newbie like 
myself can still teach a few old dogs new tricks   :-)

Each seat requires a Seat Slide assembly (Part 821137/8; TRF Part catalog 
pg 447; Bentley pg 451), also referred to as a Seat Runner, to secure the 
seat to the floor and provide forward and rearward adjustment.

Each of these are comprised of two sliding tracks, one left and one right. 
Several Triumph models use this part (TR6, 250, some TR4, possibly GT6 and 
Spitfire).

Each track consists of two pieces, an upper and lower track. When these 
tracks are taken apart, by sliding them entirely in opposite directions, 4 
rollers can be found (two per side; one front, one rear). Each of these 
rollers assist in the "slide" action of the seat track back and forth. 

[Diagram 1]
side view of one track

--------------------   <- upper track
   O      O             <- rollers
--^------^-------^--    <- lower track


The rollers are held in place by a simple "notch" which serves as a 
stopper to prevent the rollers from hitting each other or falling out. A 
few taps with a light hammer will result in the rollers to "hop" over 
these notches and release the upper and lower tracks from one another.

The rollers themselves, each use two O-rings (see Diagram 2), eight 
required per seat slide assembly. The o-rings provide a smooth and quiet 
slide, by preventing metal touching metal.


[Diagram 2]
side view of roller

    o-rings (inserted here)

    |    |
    V    V
 __   __   __
|  |_|  |_|  |
|  | |  | |  |  steel roller
|  | |  | |  |
|  | |  | |  |
|  | |  | |  |
|  |_|  |_|  |
|__| |__| |__|


Over the course of time, these o-rings become worn due to friction, or 
develop flat spots by maintaining the same position(s). 

While this type of restoration goes far beyond typical, and is most often 
unnoticeable, it is easy and inexpensive to perform, and will provide 
years of trouble-free high-speed seat adjustments. IMHO, if replacing the 
carpets or refurnishing the seat cushions, why not address this as well.
 
________________________
Corey Sherman 
1971 TR6
corey.sherman@rcn.com





<sandner@attglobal.net>
Sent by: <sandner@attglobal.net>
02/19/01 08:18 AM

 
        To:     <corey.sherman@rcn.com>
        cc: 
        Subject:        o-rings


hi corey,
have been following the thread about the o-rings.
i rebuilt the seats in mytr6 last summer, and did not run across any 
o-ring.
enlighten me please...their placement and function
TIA
randy sandner
74.5 tr6
hyde park ny

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