What is the thread of the three bolts on the MGBGTV8 fan thermostat or Otter switch?

Just occasionally you need to replace the Otter switch on the top of the V8 engine which controls the operation of the cooling fans. Ian Ailes wanted to know where to get some replacements for the three fixing bolts or setscrews. The answer arrived overnight!

MGBGTV8 Parts Supplement MGL001B (Moss Europe). More

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Posted: 170311

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257064 - screw, locating (3)
BHA5252 - switch, fan (1)
236022 - gasket (1)
Source: MGBGTV8 Parts Supplement MGL001B (Moss Europe) pages 10 & 11


Ian Ailes sent in a query "do you know the thread of the three bolts on the MGBGTV8 fan thermostat or Otter switch?" Well the natural person to contact was Peter Beadle, formerly parts manager with University Motors, then for many years with Moss Europe and now with ARB, a specialist company supplying fasteners and fixings to suppliers in the classic car industry. Peter responded overnight saying "the cooling fans' Otter switch has HT Hex Setscrew on the MGBGTV8, OE Part No 257064(A) and is 10-24 UNC".
V8 Register - MG Car Club - the leading group for MG V8 enthusiasts at www.v8register.net