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

[keithstewart at bell.net]

As shown here:



 

Keith

Keith Stewart

 <mailto:keithstewart at bell.net> keithstewart at bell.net

World of Triumph  <https://keith-stewart.ca/> https://keith-stewart.ca/ 

 

 

 

 

From: Don Hiscock <don.hiscock at gmail.com> 
Sent: October 6, 2025 3:35 PM
To: keithstewart at bell.net
Cc: Triumphs list <triumphs at autox.team.net>
Subject: Re: [TR] Which threadlocker color for wet-liner four AC fuel pump diaphragm cover screws?

 

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 <mailto: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 <mailto:keithstewart at bell.net> 

World of Triumph https://keith-stewart.ca/ 

 

 

 

 

From: Don Hiscock <don.hiscock at gmail.com <mailto:don.hiscock at gmail.com> > 
Sent: October 6, 2025 1:20 PM
To: Triumphs list <triumphs at autox.team.net <mailto: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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