[TR] [EXTERNAL] - RE: '3a carb piston getting stuck....

[David Templeton]

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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