[TR] Which threadlocker color for wet-liner four AC fuel pump diaphragm cover screws?

[Don Hiscock]

Let me check that, Keith.  Yes, lockwashers would make sense.  I'm sure I
put back everything I took off when I replaced the diaphragm, but who knows
what happened before me.  Thx --

On Mon, Oct 6, 2025 at 1:18 PM <keithstewart at bell.net> wrote:

> Seems to me those machine screws had lock washers under the head and maybe
> hard to tell, but your picture seems to not show a washer.
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> Keith
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> Keith Stewart
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> keithstewart at bell.net
>
> World of Triumph https://keith-stewart.ca/
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> *From:* Don Hiscock <don.hiscock at gmail.com>
> *Sent:* October 6, 2025 1:20 PM
> *To:* Triumphs list <triumphs at autox.team.net>
> *Subject:* [TR] Which threadlocker color for wet-liner four AC fuel pump
> diaphragm cover screws?
>
>
>
> For some unknown reason, after ten years or more in the TR3B the machine
> screws that hold down the top of the diaphragm cover on the original AC
> fuel pump have started working loose as the car is driven.  Gasoline then
> seeps slowly from the edge of the diaphragm due to the pressure head in the
> tank.  Very odd.  The first time I was willing to chalk up to a one-off.
> But now it's a trend.
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> There's only so tight one wants go go on those screws without distorting
> the diecasting, and I'm probably a little past where I feel comfortable now.
>
> Seems like a case for a threadlocking compound.  I'm guessing purple
> Locktite might do the trick -- it shouldn't take much.  Has anyone been
> down this road ahead of me?
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> https://photos.smugmug.com/photos/i-QWD7M6q/0/KGTMZ64Lk6ZV6VHFPGR8PKkQNJvmJHxd74ZVFkQLS/X5/i-QWD7M6q-X5.jpg
>
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