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MG MGB Technical - King Pin Wear - How Much?

Anyone remember offhand what the range of measurement is for king pin diameter?

I'm trying to determine if mine need replacing. They could well be original and they weren't treated very well for many years, but surprisingly they look ok. I just want to verify that by measuring the OD.
Steve Simmons

i don't know the size of the kingpin but for the price of them just fit a recon unit,i've just fitted them to my car and they cost £32 each,it's not worth messing about with the old one's,
have fun,
dave.
da wright

The manual gives bush inner dias, top .7815 to .7820 bottom .9075 to .9080. The book does not give numbers for the swivel pins either in General Data or the front suspension chapter it just counsels inspecting them for wear and ovality. So if yours look good to go and have a dia consistent with the above then they are OK to live again.
Stan Best

Thanks guys. My pins have a lower diameter of .906 and a top of .800. Not sure how the top is too big, but I'll concentrate on the bottom here...

Any idea how much of a difference there should be between the bush and the pin? I'm assuming there would be a thousandth or so but perhaps I'm mistaken?
Steve Simmons

I can't imagine it would be that tight, the tolerances above are a thou or so, assuming the same for the pin you are looking at a min of about 2 thou up to 5 or so if both go the other way. I checked the book and nothing wrong with my typing. It also gives it in new money as 19.83 to 19.86 mm which stacks up with the imperial numbers. This book is original so maybe they beefed up the dia later?
Stan Best

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This thread was discussed between 04/08/2008 and 12/08/2008

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