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MG MG Y Type - What thread

Hi can anyone tell me what thread the bolts are, bell housing to engine. They are not BSF
Thanks John
jr dennis

They are Systeme Francais 8mm dia x 1mm pitch threads.
R A WILSON

Ask for M8 fine at your local fastenings retailer.
Peter
Peter Vielvoye

If you go to the Technical Centre, then Technical Data then SIZE MATTERS you should find all the thread sizes there JR.

Most things are on the site.

Paul
Paul Barrow

Thanks for replies
John
jr dennis

John
All bolts / studs in the motor have metric (mostly fine) threads but have BSF/Whitworth heads, hence the term "Mad Metric".

As mentioned by Paul, check out the Fastener page at http://www.mg-cars.org.uk/imgytr/pdf/fastener.pdf

The XPAG/W motor has its origin in France well before WW2.

Stuart
Stuart Duncan

http://www.mg-cars.org.uk/imgytr/pdf/madmetrics.pdf

Roger Furneaux can also supply most of the useful bolts / studs.

Richard
R E Knight

Stuart said: "All bolts / studs in the motor have metric (mostly fine) threads but have BSF/Whitworth heads, hence the term "Mad Metric"."
A couple of years ago, one of the main bolts on my garage door sheared, causing the door to drop. (It's an up and over door.) A local specialist had a look at it and told me that imperial measurement nuts and bolts are now obsolete and that I needed a new garage door. I took the sheared bolt along to a company that I knew who marketed all sorts of fixings, explained to them the problem and the garage specialist's advice. The fellow at the counter took the remains of the imperial bolt, tested a few mixed size metric nuts until he found one that spun down the thread. He gave me a handful of both nuts and bolts, pro bono. The garage door still hangs as good as it did when built in 1953. I love the term: Mad Metric. It defines the so called garage specialist, perfectly.
R Taylor

Metric Threads-"The XPAG/W motor has its origin in France well before WW2."
For those who are interested, the use of metric threads on our cars goes back to before WW1.
As war approached, the French armament manufacturer Hotchkiss et Cie, fled their Paris factory and set up production in Coventry.(best known for their Hotchkiss machine guns). After the war ended, work was naturally in short supply and they began making engines for W R Morris, which went in the Bullnose Cowley and Oxford cars. All their tooling was of course metric and would have been too expensive to change over to Imperial, so WRM agreed that they could continue to use the Metric threads, but bolt head sizes had to be Imperial as all tools in England and the Commonwealth(where Morris cars were mainly sold) used Imperial spanners.
Hence the reason for our "mad metrics"
History lesson over- Regards.
Keith
PS It is interesting that in January 1923, WRM bought out the Hotchkiss business, just 6 months before the first Raworth bodied M.G. Sports car was sold.

Keith D Herkes

This thread was discussed between 22/02/2017 and 23/02/2017

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