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MG Midget and Sprite Technical - Lower wishbone trunnion bush dimensions

Years ago I was speaking to a guy that mentioned that he had converted a number of midget wishbones to use the Triumph Spitfire trunnion bush kit so that the parts were replaceable so I recently bought a kit off ebay to have a look and see what it might entail. The tophat bushes are 3/4"OD 9/16"ID, the tophat flange is 1.1" OD, so the bore is the same as the midget kingpin bore. I was wondering if someone had a standard wishbone around and could measure the length and OD of the 2 brazed in bushes to see what the size difference is to these tophat bushes and maybe the larger trunnion thread diameter, the smaller being 9/16" IIRC to pass through the bottom of the kingpin.
David Billington

Overall width (front of front bush to rear of rear bush)3.45"
large bush OD 13/16"
small bush OD 3/4"
both bushes 1.25" long
small thread 9/16"
large thread 0.65"
I haven't got a thread gauge handy, but counting teeth etc pitch calcualtes at 15.7 so I gues it's 16tpi, which would make the 9/16 BSF.
Paul Walbran

Paul,

Thanks for the information, food for thought!
David Billington

This thread was discussed between 07/10/2016 and 11/10/2016

MG Midget and Sprite Technical index

This thread is from the archive. The Live MG Midget and Sprite Technical BBS is active now.