Replaced the Exhaust header graphite seal

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kevxtx
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Replaced the Exhaust header graphite seal

Post by kevxtx » Sat Jun 02, 2012 11:27 pm

Yesterday I replaced the 2X exhaust flange seals + the rear header graphite seal which was leaking.

As you can see the graphite seal is half missing & burnt away, this is common problem on these 990's. The only trick with the graphite seal is make sure both surfaces are clean, sand the areas down so the seal is not damaged when installed, assemble the headers together before installing the pipe I had to use a rubber hammer to align the seal into the correct position, then disassemble & install the exhaust system back into the bike. I also used some copper paste on the exhaust bolts so they don't seize up over time.

I gave the whole exhaust a good polish with a metal polish called Autosol, the pipe looks like new now.

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Vrednie
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Re: Replaced the Exhaust header graphite seal

Post by Vrednie » Sun Jun 03, 2012 1:27 am

Wow, that's well and truly knackered! How did you find it was leaking? Did you hear it or were you getting abnormal movement in that section of the pipe?
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Re: Replaced the Exhaust header graphite seal

Post by kevxtx » Sun Jun 03, 2012 1:55 am

My WideBand commanded was showing abnormal lean air fuel ratios on the rear cylinder all of a sudden, I could not here it blowing over my Leovince pipes until I took a short piece of garden hose & held it to my ear & moved it around all the exhaust joints then found the exhaust leaking at the graphite seal.

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Re: Replaced the Exhaust header graphite seal

Post by Vrednie » Sun Jun 03, 2012 3:43 am

I'm not sure what i'm more impressed with kev, the wideband commander or the Garden hose!!! :lol:
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Re: Replaced the Exhaust header graphite seal

Post by kevxtx » Sun Jun 03, 2012 10:07 am

Exhaust is nice & clean again, a short ride & the gold has come back.

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Re: Replaced the Exhaust header graphite seal

Post by Vrednie » Mon Jun 04, 2012 1:50 am

Nice! And i noticed the custom mount for the GoPro! That would be an interesting aspect to watch
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Re: Replaced the Exhaust header graphite seal

Post by kevxtx » Tue Jun 05, 2012 12:50 pm

Vrednie wrote:Nice! And i noticed the custom mount for the GoPro! That would be an interesting aspect to watch

The lower camera view it different it does show how light the front end gets when playing with rapid throttle openings.

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Re: Replaced the Exhaust header graphite seal

Post by paule » Fri Jun 22, 2012 10:19 pm

Kev, any chance you could post a better pic of that Gopro mount you made or better still let me know how you made it and where you attached it. I take it the string is a "just in case", I constantly looking in the mirror to see if my gopro still attached to my helmet, it's a real pain so i'd rather mount it on the bike where I can see it.

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Re: Replaced the Exhaust header graphite seal

Post by kevxtx » Sat Jun 23, 2012 3:56 am

This is the mount I use, it can be bolted most places & with the two balls it allows for many angles on the bike.

http://www.ebay.com.au/itm/RAM-Motorcyc ... 5d33f86eaa

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Re: Replaced the Exhaust header graphite seal

Post by paule » Sat Jun 23, 2012 10:44 am

Thanks Kev, I recon i've got most of those bits in my garmin zumo 550 fitting kit which I didn't use.

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Re: Replaced the Exhaust header graphite seal

Post by bambadoo » Wed May 18, 2016 5:52 pm

New seals ordered. Bike is approx 50000km now. Dont think they have ever been replaced.

The smt has startet popping, farting and at low rpms it even stops sometimes. I read that this could cause such a problem.

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Re: Replaced the Exhaust header graphite seal

Post by limeyduffa » Thu Dec 29, 2016 11:35 am

Hi Kev

Thanks for posting this. I normally get the dealer to do this, but I'll give it a crack. Just to confirm, this is the parts list ?

3 61005005000 EXHAUST GASKET 05
21 58405005001 GRAPHITRING 45X50X25

This was a problem with my old 06 SD (gaskets had to be replaced every year). On my 2012 SMT, I got the gaskets replaced about 2013 (after one year of ownership). I've never had an issue, but can now hear hissing from the back of the motor. Normally it's always the back one.

Do you know of any aftermarket products that out perform these perishable graphite parts ?

Vrednie: Too test for leaks: A trick the dealer mechanic would do was get two rags and cover up the cans. The hissing can then be heard over the engine running.

Cheers J
Last edited by limeyduffa on Thu Dec 29, 2016 11:37 am, edited 1 time in total.

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Re: Replaced the Exhaust header graphite seal

Post by limeyduffa » Thu Dec 29, 2016 11:36 am

bambadoo wrote:...
Is your SAS still connected ?

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Re: Replaced the Exhaust header graphite seal

Post by bambadoo » Mon Jan 02, 2017 12:27 pm

No its not.
However - the popping has stopped :) Seems as if new seals made the trick.

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Re: Replaced the Exhaust header graphite seal

Post by kevxtx » Mon Jan 02, 2017 8:06 pm

Glad you got it sorted, :D

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