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Bob uk
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Posted on Wednesday, 24 September, 2014 - 07:27:   Edit PostDelete PostView Post/Check IP

Older cars had bell cranks and clevises and levers controlling stuff. Often made of brass which can wear badly at the pivots and clevis pins due to age and lack of lubrication.

A quick and easy way to repair oval holes in links etc that are LIGHTLY loaded is to soft solder the hole up and re-drill. Big ends are made from soft white metal, so it works quite well.

With brake rods such as a Cloud the pins and joints are heavily loaded and they must be a good fit. Solder will probably dent and squeeze out of the side.

Worn pivots can snap due to a oval hole leaving no meat to support the load. So care must be taken in how the hole is repaired. Bronze /brazing is a strong enough process to repair such linkages.

I like to make a thin walled Bush with 10 thou thick walls from a steel bolt and often it will fit with a bit of filing to the worn hole. Drilling a misshapen hole often leads to the hole being in the wrong place. Then braze the bush in file it up, black paint and it's very strong and invisible. Make the Bush to long.

Silver solder could be used but is weaker and more expensive and better used for decorative delicate stuff. Melts at a lower temperature than braze.

I soldered up the wear in a pair of SU carbs for a 1955 MGA a few years back because the choke knob was almost touching the gear lever to get the car started. The brass levers that pull the main jet down were so worn that they were rattling around. Solder and New pins and no play.

(Message approved by david_gore)

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