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Author Topic: Triumph 3TA mystery!  (Read 1689 times)

Offline Frankie J

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Triumph 3TA mystery!
« on: November 01, 2020, 02:10:12 PM »
I have a Triumph 350cc 3TA engine, 1961, and have found a 1/4 BSF threaded hole in each of the rocker boxes and I cannot fathom out what they are for. The wall thickness is only about 1/8 ins.

Has anyone got an Idea what they may be for?
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Offline mini-me

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Re: Triumph 3TA mystery!
« Reply #1 on: November 01, 2020, 03:37:19 PM »
where is your 'ole and how many? sound to me as if the lower studs are awol

as here.https://www.vintage-motorcycle.com/en/parts/triumph-used/rocker-box-usedtriumph3ta5tat100at21-1

it'll be whit thread not BSf  unless its been bodged, likely.
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Offline TGR90B

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Re: Triumph 3TA mystery!
« Reply #2 on: November 01, 2020, 05:45:25 PM »
Possibly someone tried to fix some sort of vent to each one. They do tend to be leaky if pressure builds up due to worn valve guides etc.
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Getting grumpy, but not as grumpy as mini-me.
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