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MG parts spares and accessories are available for MG T Series (TA, MG TB, MG TC, MG TD, MG TF), Magnette, MGA, Twin cam, MGB, MGBGT, MGC, MGC GT, MG Midget, Sprite and other MG models from British car spares company LBCarCo.

MG MGA - carb banjo bolt size

the threads for the carb banjo bolt appear to be 3/8" 18TPI. I need to buy a tap for these. What is the thread pitch?

Thanks.

JIM
AJ Mail

to clarify - this is for the bolt holding the float bowl to the bottom of the carb...not the fuel inlet line at the top of the carb...

JIM
/
AJ Mail

I would hazard a guess that if fuel goes past the threads they are British Standard Pipe (parallel). If the bore is 3/8" then BSP pitch will be 19 tpi. All the screw heads and nuts are Whitworth/BSF on the SUs ...............Mike
m.j. moore

I will order a BSPP 3/8" - 19TPI tap then, thanks.

JIM
AJ Mail

Jim - A 3/8 BSP has a OD of 0.6560", not 3/8". I would suggest that you e-mail Joe Curto at: JoeCurto@aol.com to get the proper size for the banjo fitting. Cheers - Dave
David DuBois

Jim, My guess was off the mark. It's actually a BSF thread and you will need a 7/16" BSF tap. You were right first time on the pitch which is 18 tpi. ................Mike
m.j. moore

That is what I remembered from the TD carbs but didn't know if it was the same on the MGA carbs. Cheers - Dave
David DuBois

Having received two different answers, I ordered both taps - the 7/16 BSF and the 3/8-19 BSPP. The BSF tap is correct for TD/TF - I confirmed that by calling Abingdon Spares, though they couldn't swear that it would fit MGA - though the carbs certainly look similar.

JIM
AJ Mail

This thread was discussed between 08/03/2012 and 10/03/2012

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