[TR] Retrofitting a reverse light switch on a TR4

[Jerry Van Vlack]

Dean,

Disassembly of at least the reverse rod should be done. The most difficult 
issue with this is removal of the small square headed tapered bolt / pin. It 
can easily be broken. I'd recommend getting an 8 point socket that fits it 
tightly and don't apply any sidewise force when loosening the bolt. A firm 
initial rotation should get it started.
Locate. Drill and tap the isolator switch hole.
Assembly of the rod is pretty straight forward but you have to make certain 
you get the little ball inserted properly. The ball keeps you from engaging 
it's rod incorrectly. There is also a cap, spring and pin that helps lock 
the rod in place when you shift. Count the turns of the cap when you remove 
it and replace with the same number of turns making certain it's at least 
flush with the sealing surface of the top cover. All of the disassembly and 
reassembly is well covered in the factory service manual.

Hope this helps, write to me with any additional questions.

I have the tap if you'd care to borrow it when the time comes. Don't know 
the drill size but can look it up based on the tap size. I don't have the 
drill, my shop did.

JVV

-----Original Message----- 
From: Dean Mericas
Sent: Monday, April 20, 2020 6:30 PM
To: Jerry Van Vlack
Cc: triumphs at autox.team.net
Subject: Re: [TR] Retrofitting a reverse light switch on a TR4

Thanks, Jerry. Is the disassembly of the cover very involved?  It looks like 
at least one of the shift rods needs to be removed prior to drilling.

Dean
Sent from my iPad

> On Apr 20, 2020, at 4:54 PM, Jerry Van Vlack <jerryvv at roadrunner.com> 
> wrote:
>
> It's pretty easy, drill and tap the top cover on the boss where the 
> reverse light switch would go and buy an OD isolator switch. The shift 
> fork is already cast to turn the switch on and off.
>
> I think the instructions are in the Factory service manual. Need the 
> correct tap and drill. I believe the tap is metric. If you need more info 
> write to me and I'll try to drill it down further.
>
> I've done it.
>
> JVV
>
>
> -----Original Message----- : Dean Mericas
> Sent: Monday, April 20, 2020 5:45 PM
> To: triumphs at autox.team.net
> Subject: [TR] Retrofitting a reverse light switch on a TR4
>
> I’ve got the transmission on the floor of my shop, and am wondering if I 
> should take this opportunity to install a reverse lamp switch. How big a 
> deal is the retrofit?
>
> Thanks.
>
> Dean
> 1965 TR4
> 1974 Alfa Romeo 2000 GTV
> 1976 Alfa Romeo Giulia Nuova Super 2L
> Austin, TX
> Sent from my iPad
> ** triumphs at autox.team.net **
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