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Thread ID flywheel pit cover

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Thread ID flywheel pit cover
Ivor Hawkins Offline
Mechanically sympathetic
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Joined: Aug 2017 Posts: 1,644 Threads: 23
Reputation: 15
Location: The village of Evenley
Car type: 1934 Austin Seven RP Deluxe
#1
24-07-2019, 01:51 PM
help! I don’t think someone has drilled out and retreaded the bolt holes holding down the flywheel cover, but I’ve tried both Whitworth and BSF bolts and no luck...can anyone let me know what the standard size should be?
Ta!
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Alan Offline
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Joined: Aug 2017 Posts: 1,337 Threads: 34
Reputation: 30
Location: Cheshire
Car type: Race Ulster, 1926 Special, 1927 Chummy, 1930 Box
#2
24-07-2019, 01:55 PM
1/4BSF
Alan Fairless
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Ivor Hawkins Offline
Mechanically sympathetic
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Joined: Aug 2017 Posts: 1,644 Threads: 23
Reputation: 15
Location: The village of Evenley
Car type: 1934 Austin Seven RP Deluxe
#3
24-07-2019, 02:02 PM
Thanks Alan, I’ll measure up and see if they are still standard...and order some 1/4 bsf set screws just in case!

“Friends” comes to the rescue again Smile
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Robert Leigh Offline
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Joined: Aug 2017 Posts: 926 Threads: 22
Reputation: 10
Location: Near Cambridge, UK
Car type: 1928 tourer (mag type), short chassis Gould Ulster
#4
24-07-2019, 02:37 PM
Mine are all 5/16" whit for the 'tin' cover, but there are 5/16" BSF to hold our mag Chummy starter.
Robert Leigh
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Chris KC Offline
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Joined: Aug 2017 Posts: 3,393 Threads: 106
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Location: Darkest Bedfordshire
#5
24-07-2019, 02:39 PM
Sorry Alan, I'm with Robert here! Mine are 5/16".
That's not to say they haven't been enlarged, but every 1/4" screw in the case is BSW as far as I'm aware...
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Alan Offline
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Joined: Aug 2017 Posts: 1,337 Threads: 34
Reputation: 30
Location: Cheshire
Car type: Race Ulster, 1926 Special, 1927 Chummy, 1930 Box
#6
24-07-2019, 03:44 PM
Ah I’m talking of the clutch cover plate not the bit of tin that covers the bell housing. In that case it is 5/16 BSF on eRly engines and whit on the later ones. Sorry for the confusion.
Alan Fairless
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Ivor Hawkins Offline
Mechanically sympathetic
*****
Joined: Aug 2017 Posts: 1,644 Threads: 23
Reputation: 15
Location: The village of Evenley
Car type: 1934 Austin Seven RP Deluxe
#7
25-07-2019, 10:00 AM
Thanks fellas, yes it's the tin cover I'm talking about, so I'll check that it's 5/16 whit . I have a feeling someone may have stripped the threads in the past...how they've managed that I'll never know...
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Ian Williams Offline
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Joined: Aug 2017 Posts: 1,715 Threads: 47
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Location: Auckland NZ
Car type: 36 Nippy, 31 RM, 38 Special, 24 Works Rep
#8
25-07-2019, 10:20 AM
I had an engine through my hands where a previous owner had helicoiled a number of stripped 5/16" threads in the crankcase with M8 inserts, but used 5/16 UNF inserts for the head studs! Gets very confusing when people use non standard threads.
Black Art Enthusiast
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