Re: brake light switch 47 clipper

Posted by HH56 On 2020/6/3 13:57:41

I had the same issue on my 47 with the SL 134. Even replaced the banjo bolt and still had a leak. Though it is not recommended I finally used a teflon wrap on the threads. You could also use a thread sealant as long as it is compatible with brake fluid.

What I believe may be happening is there is an incompatibility in the threads between the banjo bolt and the switch threads. I imagine Kanter might use a common modern switch replacement and Napa does not specify on their SL134 switch (aftermarket replacement) if it has NPT or NPS threads. O_D thinks it is tapered and it may be. I don't know what Packard used on their banjo bolt but halfway suspect it might be straight threads.

Here is a bit on threads from the Engineering Toolbox.engineeringtoolbox.com The first line is all that Napa says on the SL 134. The remainder is info from the Engineering site. Note the thread dimensions are nearly identical but the telling factor is the taper takes an R drill for the thread tap which is .339 and the straight takes an S drill at .348 so slightly larger. If Packard used straight that slight difference in hole size along with the thread differences could be the source of the leak.

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