Author Topic: A10 Exhaust Seal  (Read 2168 times)

Offline Brucie64

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A10 Exhaust Seal
« on: 01.07. 2010 09:42 »
Hi All,

Just fitted a new exhaust to my A10, it proved to be a bit of bitch to fit but thought I had got there in the end with a bit of tugging and pulling. However after a short run I noticed that the header pipes must not have sealed fully to the barrels as I had developed sooty deposits on both pipes where they join the engine. In an attempt to fix this I then took both exhausts off and tried a bit of exhaust muffer paste on each of them before refitting. The next day I again took the bike for a run only to find 10 miles down the road the exhaust pressure has blown a hole in the paste seal on one side.

1. Does anyone know if there is such a thing as a proper exhaust seal for A10 header pipes. I have seen on the interent the small bore copper washers for the Bantam header pipes and such like but as yet none for A10's?

2. If these don't exist, what does everyone else use to make sure their exhausts are airtight?

Bruce
Spitfire
UK

Offline MG

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Re: A10 Exhaust Seal
« Reply #1 on: 01.07. 2010 10:11 »
I'm using Loctite 5920. Worked pretty well so far, as long as the leaks are relatively small.
I also found that the cured muffler paste is too brittle and will disintegrate from the vibration.
1955 A7 Shooting Star
1956 A10 Golden Flash
1961 Matchless G12 CSR

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Online bsa-bill

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Re: A10 Exhaust Seal
« Reply #2 on: 01.07. 2010 10:56 »
never have needed anything on my Flashes, I'm thinking maybe forget about anything extra and beg, borrow or find someone with a pipe swage and expand the pipes
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline lawnmowerman

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Re: A10 Exhaust Seal
« Reply #3 on: 01.07. 2010 11:26 »
My old system was a bit loose in the ports and the PO had used a piece of thin alloy shim about the thickness of a beer can wrapped around inside the port and stuck with a smear of exhaust paste before fitting the pipes. It seemed to work ok and was a cheap fix.
The other advantage is that it gives a genuine reason to empty a beer can before you start work   *beer*
The new system was a snug fit after shortening the pipes a bit so did not need any sealer.
Bill's suggestion is a better fix but I think you may have to heat up the pipes to avoid splitting while expanding them and it may blue the chrome.
Jim
1959 A10 SR
1938 Wolseley 14/60
1955 Ferguson TEF20 tractor
1965 Ferguson 135 tractor
1952 Matchless G80 rigid
1960 BMW R60
1954 Matchless G80S
1955 Ariel 500 VH
1951 Sunbeam S7DL
1960 Matchless G12 with Watsonian Monza
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Offline alanp

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Re: A10 Exhaust Seal
« Reply #4 on: 01.07. 2010 17:09 »
Brucie, I bought some of this stuff on ebay - Pro Seal Copper XS Hi Temp Silicone Sealant. It's suitable for temperatures up to 700 degrees F. Much to my surprise and pleasure it works a treat.
Alan
Member of the 'Last of the Summer Wine Club - Jennycliff'.

Offline wilko

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Re: A10 Exhaust Seal
« Reply #5 on: 02.07. 2010 01:02 »
Been using ordinary clear slicone for years on bikes and cars! Works a treat and heat resistant.

Online Brian

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Re: A10 Exhaust Seal
« Reply #6 on: 02.07. 2010 01:05 »
Most automotive exhaust places have hydraulic pipe expanders, these are a multi fingered device that goes in the pipe and expands it as little or as much as you like.

I have used them to just bring a pipe back to round if its slightly oval or to expand the pipe to a nice snug fit. The ideal fit is so it needs a few taps with a plastic hammer to get the pipe in.

Another sealant that can be used and works is clear silicone (roof and gutter), one of those things that you wouldnt think would be suitable but is.

Online Brian

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Re: A10 Exhaust Seal
« Reply #7 on: 02.07. 2010 01:07 »
Wilko we both posted at the same time, does that mean great minds think alike or two drips go down the same drain.  *smile*

Offline coater87

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Re: A10 Exhaust Seal
« Reply #8 on: 02.07. 2010 05:09 »
 They make hand expanders, but if you have to go any real amount these require SUPER human strength, or a big vice to leave marks in the pipe and a cheater bar to bend your good wrench with. Better to spend a couple of bucks and have a shop do it...

 Silicone sealant huh? Never heard of that, and never would have thought it would work. Thats something to remember!

 Lee
Central Wisconsin in the U.S.

Offline Brucie64

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Re: A10 Exhaust Seal
« Reply #9 on: 02.07. 2010 09:25 »
Wow, thanks for all the responses guys.
 
I guess that will be me off to the local DIY shop tonight, do you think silicone sealant might work on the wife's gob as well.  *smile*
Bruce
Spitfire
UK

Offline lawnmowerman

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Re: A10 Exhaust Seal
« Reply #10 on: 02.07. 2010 09:48 »
Well it worked ok on mine with a strip of gaffa tape on top just to be safe, that is if they stop talking long enough to let it cure  ;D

Jim
1959 A10 SR
1938 Wolseley 14/60
1955 Ferguson TEF20 tractor
1965 Ferguson 135 tractor
1952 Matchless G80 rigid
1960 BMW R60
1954 Matchless G80S
1955 Ariel 500 VH
1951 Sunbeam S7DL
1960 Matchless G12 with Watsonian Monza
......and loads of lawnmowers

Too old to Rock and Roll but too young to die  (Jethro Tull 1976)

Online bsa-bill

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Re: A10 Exhaust Seal
« Reply #11 on: 02.07. 2010 09:49 »
Reckon many of us know where your coming from Bruce - but no, never still long enough for the stuff to set  *rant* *whistle*

But Jim got in before me ! so it must be true
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Online muskrat

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Re: A10 Exhaust Seal
« Reply #12 on: 02.07. 2010 10:56 »
Superglue sets quick but not good for exhausts. >:D
Cheers
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Offline Big Nick

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Re: A10 Exhaust Seal
« Reply #13 on: 02.07. 2010 22:10 »
clear bathroom sealant does the job.
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Offline Brucie64

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Re: A10 Exhaust Seal
« Reply #14 on: 04.07. 2010 17:29 »
Touch wood, Loctite 5920 seems to have done the trick, a lot better than exhaust muffler paste. Just come back from a 20 mile run and seem to have no leaks so far. I guess a longer run will decide if its a permanent fix or not.
Bruce
Spitfire
UK