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Thread: '74 Midget - Heater Box Bolt Size?

Discuss the Austin Healey Sprite and the MG Midget. Two different but similar cars sometimes referred to collectively as the Spridget.

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    Yoda AngliaGT's Avatar
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    '74 Midget - Heater Box Bolt Size?

    It's been 3-4 years since I pulled it apart,
    & not sure where I put the bolts to mount it to the
    body.What size/thread are they?
    And what size do the air outlets on the box use?
    Just Remember.......
    NOBODY ever says "COOL PRIUS!"

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    Great Pumpkin JPSmit's Avatar
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    Re: '74 Midget - Heater Box Bolt Size?

    IIRC Doug the heater box is attached with sheet metal screws not bolts.
    John-Peter Smit
    1976 MG Midget
    1969 Vauxhall Viva GT
    1958 Fiat Multipla (Barn art)

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    Yoda Jim_Gruber's Avatar
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    Re: '74 Midget - Heater Box Bolt Size?

    JP, they are bolted in place 7/16 fine thread same size as the bolts holding on the cover plate over the ps footwell. At least on a BE that’s what they are.
    Jim Gruber - Apollo Beach, FL
    Bugsy I - '68 Sprite w BE Bonnet - Gone but not forgotten
    Bugsy IV - '60 Bugeye - 1,275+.040 and a 5-Speed - CA Car - 2nd Owner from new - 10/12 Painting done, reassembly, cutting, and buffing in progress.

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    Re: '74 Midget - Heater Box Bolt Size?

    Jim, I assume you mean 7/16" across the flats which would have 1/4" threads (1/4-28 UNF = fine). 7/16 threads would be awful large.
    Doug L.
    '64 Morris Mini Cooper-S 1275
    '67 Triumph GT6 Mk1

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    Yoda Jim_Gruber's Avatar
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    Re: '74 Midget - Heater Box Bolt Size?

    Doug, You are correct, 7/16 nut 1/4 28 bolt. I just chased those threads 2 mi utes ago. 1/4 28 tap

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    Re: '74 Midget - Heater Box Bolt Size?

    I prefer to use socket head bolts on those. And use anti-seize.
    _____________________
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    Re: '74 Midget - Heater Box Bolt Size?

    Quote Originally Posted by Jim_Gruber View Post
    Doug, You are correct, 7/16” nut 1/4 28 bolt. I just chased those threads 2 mi utes ago. 1/4 28 tap
    OK,I'm a little confused.Is there a nut?
    Exactly WHAT do I need?
    Just Remember.......
    NOBODY ever says "COOL PRIUS!"

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    Jedi Warrior Rhodyspit75's Avatar
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    Re: '74 Midget - Heater Box Bolt Size?

    You need a 1/4 x 28 bolt. I believe I used 3/4 inch long. The 1/4 inch bolt has a 7/16 head that’s where the confusion comes in.
    "Age considers; youth ventures." Rabindranth Tagore
    1975 Spitfire

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    Jedi Knight jcatnite's Avatar
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    Re: '74 Midget - Heater Box Bolt Size?

    I think the nuts are captured in the body of the car. All you need are the 1/4 -28 bolts and a washer. I think 3/4 long is what I used on the 76 midget. Haven't tackled the 74 yet.

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