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

[David Templeton]

need to go and find photos :-)    Lock washers

[image: image.png]

https://www.facebook.com/photo/?fbid=10159241057656960&set=pb.589451959.-2207520000

david

On Mon, Oct 6, 2025 at 4:20 PM Don Hiscock <don.hiscock at gmail.com> wrote:

> 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.
>>
>>
>>
>> Keith
>>
>>
>>
>> Keith Stewart
>>
>> keithstewart at bell.net
>>
>> World of Triumph https://keith-stewart.ca/
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> *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.
>>
>>
>>
>> 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?
>>
>>
>>
>>
>> https://photos.smugmug.com/photos/i-QWD7M6q/0/KGTMZ64Lk6ZV6VHFPGR8PKkQNJvmJHxd74ZVFkQLS/X5/i-QWD7M6q-X5.jpg
>>
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-- 
Regards
David Templeton
Ontario, Canada
1959 TR3a TS54226L
1974 Spitsix FM10491L
1980 TR7 TCT101153UMF
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