Board index Flathead Power-Technical Questions, Answers, and Suggestions Big Twin Flatties S&S flathead power cylinders

S&S flathead power cylinders

Moderators: Curt!, Pa

Post Tue Oct 29, 2013 2:19 pm

Posts: 86
i have just won a pair of S&S flathead power ul cylinders on ebay, this is the kit with the valves and pistons etc.., i made an offer of about half what they were asking and they accepted. my question is it seems that the piston are fitted, they are marked front and rear, looks like the valves are marked too. i was wondering if S&S sells this kit ready to bolt up, valves seated, piston and rings fitted? the cylinders had a few chipped fins from shipping, all chipped pieces are included.

Post Tue Oct 29, 2013 2:26 pm

Posts: 86
next question, best technique for welding/brazing chipped fins on these cylinders

eBay item number:

Post Wed Oct 30, 2013 4:28 pm

Posts: 216
Location: Georgia
I did a search here for "fin repair" and came up with 22 threads. Some of them should help.

Post Sat Nov 09, 2013 5:51 pm

Posts: 299
Location: Cranbrook B.C. Canada
Silver solder works very well for repairing broken cast iron fins, and requires less heat than brazing does.

Post Tue Nov 12, 2013 7:53 pm

Posts: 86
thanks folks, h.d.ryder I checked with one of the backshop guys and we have silver solder, says its pricey. i work for a steam railroad, anybody have any input on technique to use silver solder rod for fin repair? preheat the cylinder? we have several guys that are excellent welders....some braze, some tig and mig and still others stick/arc. i guess the ones who braze the casting for the RR would be the best choice for this job?

Post Wed Nov 13, 2013 12:31 am

Posts: 299
Location: Cranbrook B.C. Canada
Hey Mark, The silver solder I use is pricey, but it works real well. I buy it from my local welding shop, it`s the stick
type, with the flux coating like a brazing rod. I have one of those mini acetylene outfits that the jewelers use.
Just make sure the surface is super clean and the 2 parts will stick like glue.

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