Looked it up in Canada, they wanted $50/can ? So after some reading a black
sharpie work really well and it dissolves in carb cleaner
-----Original Message-----
From: Randall [mailto:TR3driver at ca.rr.com]
Sent: Wednesday, May 23, 2018 3:46 AM
To: David Templeton <davidt at opentext.com>; triumphs at autox.team.net
Subject: [EXTERNAL] - RE: [TR] '3a carb piston getting stuck....
> Just finishing up the process of putting the refreshed carbs back on
> the '3a. All is going ok, except, the rear most piston get stuck in
> the dome when pushed up. It gets stuck as well when the dome is off
> the carb body so it is not the needle alignment. That appears to be
> good. It looks like the dome may have been dropped and now a small
> ding in the near top side that has reflected inside the dome and this
> is where the piston is getting stuck ( evidence of minor scratches ).
> What can I do?
Get some "layout dye" (aka "machinists blue" aka "Dykem") and spray (or
paint) it onto the inside of the dome where you think it is rubbing.
Eg,
https://urldefense.proofpoint.com/v2/url?u=https-3A__goo.gl_qJCrT3&d=DwICAg&c=ZgVRmm3mf2P1-XDAyDsu4A&r=346MKQty4J9yevdUa9Fj_cT53y_74TwSRM-I7J2SFzs&m=raGiqxWAZDvlvbkoqierT_tNWwCBYr_nBkbymK_hqaA&s=ksPg4d8ru1Nnh-UiBgl9CsT0gCS-UHdZ1nj69G8_DYU&e=
Push the piston up gently until it starts to bind, then remove it. If you are
right about where it is rubbing, you'll see a white spot where it rubbed off
the blue. Take a piece of fine abrasive cloth (or sandpaper) and sand down the
white spot a bit, then try again. The fit is supposed to be pretty tight, so
only remove a little at a time.
The blue dye will rinse off easily with almost any solvent although it's
somewhat harder to get off your hands. I often wind up with a blue left thumb
:)
-- Randall
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