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140 Horn Button Assembly

140 Horn Button Assembly

Hi everyone, I am a newcomer on the list, I have already got a lot of messages. The knowledge of the members is impressive! As I am working on the steering column on my 1955 FHC, I have a couple of questions of this subject. - The aluminium locknut for clamping of telescopic device ref. C7883, is it fully black painted or only the two ends are painted? On mine the grooved part has no painting. I don't know if the painting came off or if it is from the factory. - There is no more electrical connection for the horn switch and it is not clear on the spare parts catalogue. I believe there is a wire going into the steering shaft, ends by a insulated copper ring connected by something like a spring loaded brush. Am I wrong? This system was made by LUCAS, is the number in bracket (in parts catalogue) a Lucas reference? can I find a complete new one from a LUCAS specialist in UK. Thank you. - Jean Louis.

Welcome to the list. It's good fun and great help. The electrical connections for the horn are described in the XK140 supplement to the XK120/MkVII service manual. I haven't found part numbers in the parts manual. The locking nut on my 57 140 FHC is completely black. The horn contact slip ring was gone on mine as well. I got the slip ring from British Auto USA in Londonderry, New Hampshire (800) 452-4787 or (603) 622-1050. The part No. is C8152. A little filing and bending was required to make it work smoothly. The pieces that are called rotors in the service manual are also shot on mine. These are the two insulating halves that fit between the steering column and the slip ring and retain the spring-loaded contact from the horn button on the slip ring while it turns. I haven't found a source for them. I have tried to make them from carling water piping, but so far that hasn't worked out. The hard part has been making the spring retaining pocket so it stays in place over time and under pressure from the spring. Epoxy doesn't work. Need stickier adhesive! The fixed contact is still serviceable, so I haven't searched for it. Good kuck, and let us know if you find a source for some of the unusual electrical parts. - Sam Bell

Sam; I got the complete rebuild kit from XK Unlimited about a year ago. Item #16-5401 list $99.95. All the parts were there but no directions. - Regards, Skip Smith

Jean Louis: All parts for the xk140 horn assembly are available, except and there is usually an except, the insulating halves that fit under the brass slip ring to which the horn ground wire, which passes down the steering wheel shaft is attached. I took mine to a machine shop and the affixed a nylon or neophrene collar around the shaft and forced the brass slip ring, with the horn ground wire under it over the neophrene for a tight fit. Don't forget that the upper steering wheel bearing should be put on first. Mine works like a champ. Good luck Bob Cathey, xk140mc ots

Skip, Thanks for the tip. I'll give them a call this week! - Sam Bell

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