48 Pan Rocker question.

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flatboy1950
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Bikes: 1948 Pan 61
1942 sv 74 x 4
1948 sv 74 x 1
1943 42U + sidecar with 6800 miles on the clock from new.
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48 Pan Rocker question.

#1

Post by flatboy1950 »

One of my 48 Pan rockers has broken the hardened cup that the pushrod locates in. These cups seem to be riveted in place & the top , riveted piece is still in place but the cup is broken off. The broken piece is in the box with the old valves. The motor was stripped when I bought the bike.
Part # 17426-48 is shown in the exploded diagram but is not listed on the list of parts.
Is this part available seperately ??

If not , would it be safe to have the cup silver soldered back in place ??

Regards , flatboy1950
RUBONE
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Re: 48 Pan Rocker question.

#2

Post by RUBONE »

I would not trust a repaired rocker. Used originals and new replacements are easily available. And they should all be checked and clearances corrected before use anyway.
JMHO
Robbie
flatboy1950
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Re: 48 Pan Rocker question.

#3

Post by flatboy1950 »

I am in South Africa , nothing is easily available here !!
Cotten
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Re: 48 Pan Rocker question.

#4

Post by Cotten »

Flatboy1950!

If the pieces fit back together nicely, and all of the mating edges can be blasted with aluminum oxide, then it begs an attempt.

The problems with silver soldering that I am encountering boil down to identifying appropriate alloys, and obtaining them.
An immediate concern that I can conjure (from web info, so it must be true) is that a low-or-no phosphorus silver solder is used for steel, however the residual copper coating, from the heat-treating dip, requires 5% or more of phosphorus. The copper may have to be blasted or ground away quite clean.

Good luck!

....Cotten
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Re: 48 Pan Rocker question.

#5

Post by 58flh »

Cotton theory sounds good! Also correct if you are into metalurgy as I am!--But with a 1.5 rocker ratio & the constant beating it takes!---(heating-cooling -rpm-etc.) I personaly would get a new set & mate em-up!-You will have piece of mind & you dont want to crack-it while your 500miles from your shop! Just my 2 cents worth!(But if the bike is never rode & an original period bike It would be something to consider-since it just has to fire for the Judges!).--58flh :!:
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