Morris Minor Owners Club

Anyone know the correct spanner size (not the 'a blah fits' option, I've tried that) of the bolt head highlighted below?


Just noticed I highlighted a hole - OK, the bolt that SHOULD be there
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Funnily enough, the one I have here (from a Wolseley 1500 cylinder but it's probably the same) has a 2BA head. It's not a 2BA thread, but the head fits absolutely perfectly in a 2BA socket. It's 0.320" AF, and 2BA is 0.324" - that's snugger than a snug thing during national snuggling awareness week.

Hmm - tried 2BA with no joy. Doesn't seem to quite fit anything AF, Whitworth of metric - it's infuriating, and it needs to be a good fit as it's a 40 year old corroded bolt with no space for the Mole grip solution, and I'm reluctant to get the grinder out
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Cut a slot in the head with a Dremel, then use an impact driver and a big hammer?

Pretty sure i removed one of those with a 10mm socket.... just cant remember if it was a 6 sided internally one or one of halfords corner grippy ones.
Assume youve tried some heat on it BG?

EDIT : Had to use a metric not through being a heathen but through lack of proper spanners for the mog

Dear Santa ......

I used a metric socket too - I also think it may have been 10mm, definately six sided in my case.

Its the one beneath the cylinder I can never fit anything to.

dunketh wrote:Its the one beneath the cylinder I can never fit anything to.

The one I have next to me is exactly 1/2" AF.

We're talking the smaller of the 2 bolts, boys - the bigger seems to be around 1/2 inch AF, certainly, but the little one isn't quite 8mm or any of my imperial spanner sizes - closest is 2 BA. What I was after was the ACTUAL size of it - and yeah, I know the various ways of helping it to come out, but it would be handy to have the right tool for the job
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Ah that little beasty !! fluked that one with a really poor quality 7.5mm IIRC (so poor quality that none are the sizes they say quite)

7.5mm is too small: 0.295"
8.5mm is close: 0.335"
11/32 is not quite as close: 0.344"
2BA is perfect: 0.324"

I suspect the bolt head is rusty or rounded, stopping the 2BA socket going on.

So do I- but a little drilling and finessing with a grinder and chisel and it's gone. As for the people who managed it with a 10mm socket - how? did you pack it out with weld or something? 2 BA will work on the replacement - and it did remove a different one
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There are various head sizes for that annoying little screw!! I've certainly got more than one - and I just range along the small sockets till one fits - can't say I've noticed which. I have considered just doing without - but so far i have always put it back - but not too tightly!

I too have found various sizes for this one - I think originally it was 3/16BSF (1/8Whitworth head) but I have used 11/32AF and the last cylinders I bought used 10mm.

Rog

Thanks, Roger. The four I've been playing with (so 8 of the bolts) seem toy have various different sizes, sometimes on the same back plate. This old car thing is a laugh sometimes, innit...
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PS Now having the same problem with big end cap bolts too. Curses

Sounds like you need more sockets!

You think its bad on the Mog, try finding the right socket on any part of a Jowett Javelin. They used AF, Whitworth, BSF, and Metric on all parts of the car.....whatever was to hand after the war i guess. Still, it makes finding the right socket for that stuck bolt/nut a total nightmare!

Nope, I have many, many sockets and spanners of all flavours. This is the second engine on which I've had problems with these bolts though
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