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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.
=20
Keith
=20
Keith Stewart
World of Triumph https://keith-stewart.ca/=20
=20
=20
=20
=20
From: Don Hiscock <don.hiscock@gmail.com>=20
Sent: October 6, 2025 1:20 PM
To: Triumphs list <triumphs@autox.team.net>
Subject: [TR] Which threadlocker color for wet-liner four AC fuel pump =
diaphragm cover screws?
=20
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.=20
=20
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?
=20
https://photos.smugmug.com/photos/i-QWD7M6q/0/KGTMZ64Lk6ZV6VHFPGR8PKkQNJv=
mJHxd74ZVFkQLS/X5/i-QWD7M6q-X5.jpg
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--></style></head><body lang=3DEN-CA link=3Dblue vlink=3Dpurple =
style=3D'word-wrap:break-word'><div class=3DWordSection1><p =
class=3DMsoPlainText>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.<o:p></o:p></p><p =
class=3DMsoPlainText><o:p> </o:p></p><p =
class=3DMsoPlainText>Keith<o:p></o:p></p><p =
class=3DMsoPlainText><o:p> </o:p></p><p class=3DMsoPlainText>Keith =
Stewart<o:p></o:p></p><p class=3DMsoPlainText><a =
href=3D"mailto:keithstewart@bell.net";>keithstewart@bell.net</a><o:p></o:p=
></p><p class=3DMsoPlainText>World of Triumph <a =
href=3D"https://keith-stewart.ca/";>https://keith-stewart.ca/</a> =
<o:p></o:p></p><p class=3DMsoPlainText>=C2=A0<o:p></o:p></p><p =
class=3DMsoPlainText><o:p> </o:p></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p> </o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p> </o:p></span></p><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span><=
/b><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'> Don Hiscock =
<don.hiscock@gmail.com> <br><b>Sent:</b> October 6, 2025 1:20 =
PM<br><b>To:</b> Triumphs list =
<triumphs@autox.team.net><br><b>Subject:</b> [TR] Which =
threadlocker color for wet-liner four AC fuel pump diaphragm cover =
screws?<o:p></o:p></span></p></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><div><p =
class=3DMsoNormal>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. <o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal>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.<br><br>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?<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal><a =
href=3D"https://photos.smugmug.com/photos/i-QWD7M6q/0/KGTMZ64Lk6ZV6VHFPGR=
8PKkQNJvmJHxd74ZVFkQLS/X5/i-QWD7M6q-X5.jpg">https://photos.smugmug.com/ph=
otos/i-QWD7M6q/0/KGTMZ64Lk6ZV6VHFPGR8PKkQNJvmJHxd74ZVFkQLS/X5/i-QWD7M6q-X=
5.jpg</a><o:p></o:p></p></div></div></div></body></html>
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