Where to have my stromberg NA-SB rebuilt

[N63045]

Re: Where to have my stromberg NA-SB rebuilt

Marty,

Thanks for the heads up about KPS. I just got off the phone with them. To overhaul the Stromberg, if it does need any new parts, is $300. I will probably be sending my carb to them.

[M Towsley]

Re: Where to have my stromberg NA-SB rebuilt

I hope it works out well for you.

I run 100LL pretty exclusively, I had a bad experience with Mogas, plus it is non-existant here except for one station who thinks they are pumping liquid gold instead of ethanol-free premium. After having KPS set-up the carb I have not had to touch it at all, even in winter conditions. Good luck!

[Hank Jarrett]

Re: Where to have my stromberg NA-SB rebuilt

Agree Marty. I posted the info since a clear understanding of how the carb works makes it a lot easier to troubleshoot. I would NOT recommend anyone tear down and overhaul one on their own unless they REALLY know what they are doing. I have rebuilt several Eisemann Mags and a couple of these carbs (under supervision), but the one on my plane now I could never get adjusted and ended up sending it out to be rebuilt. Funny thing was the overhaul shop called me and asked what the date was on the manual I was using. Seemed like a funny request so I pulled it out and found I had TWO manuals, one he told me had an error and had been recalled! The mixture screw end limit was supposed to be the STARTING point. He said the carb was almost perfect.....except the mixture had to be opened up just a touch.

@_($#%&@(#$$%!

Now the scary part. I had the old needle and seat, which was in perfect condition, but found the old type rubber fails if exposed to alcohol. The manual didn't mention that. I got the new needle and seat.

Remember, no matter how much you know (or think you know), there is always something to sneak up and bite you. Lucky I always have been pretty anal about not getting any alcohol in my fuel. Be SURE the auto fuel you get really is alcohol free!

Hank

Hank,

I have torn down, set the float height, and reassembled these carburetors. All under an A&P/IA's observation, (who hadn't a clue how to do it). If you don't have the right tool, which is a large machined piece to remove and adjust the float seat, instructions on how to do it are not going to help. You also need to have a perfectly level base to work off of and a piece you can set the carb into, for the carbs protruding studs, that is also perfectly level to even start the procedure. Not to mention all the gaskets to set seat height. It can take several days to make sure there are no leaks through the needle and seat, and that is if he even has the right needle and seat. It is such a PITA that I decided to have KPS do mine after having my engine stop of final one day. (It had a blocked idle port). KPS got it right the first time.

The pictures below are a tool I had made out of a Craftsman socket adapter. You cannot use a screwdriver to remove the seat, it can easily be damaged.

[astjp2]

Re: Where to have my stromberg NA-SB rebuilt

You can get new Marvel carbs for the A series engines now too, with a real mixture. Tim