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valve seal replacing

Classic Norton Commando Motorcycles.

valve seal replacing

Postby ludwig » Mon Aug 30, 2010 6:46 am

delete
Last edited by ludwig on Mon Jul 17, 2017 1:40 pm, edited 16 times in total.
Si tous les dégoûtés s'en vont , il n'y a que les dégoûtants qui restent ..

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Re: valve seal replacing

Postby britbike220 » Mon Aug 30, 2010 9:27 am

Very clear and it answered all of the questions I had, many thanks Ludwig. I will download and print your thread as a supplement for my manual, thanks again.

Tim
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Re: valve seal replacing

Postby slimslowslider » Mon Aug 30, 2010 10:15 am

Ludwig, thanks for the effort taken to share this.

Fellow Norton rider got stranded on the way back from the INR in Spain with a broken valve spring.
He still is waiting for the bike to be transported home.
Had he had your tools, and a spare spring of course, he could have repaired it on the spot.

Looks like another set of special tools I am going to add to the onboard toolkit.

Another thing one could consider to do at the same time is to tackle any rocker/valvestem misalignment (brass shim instead of spring washer).

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Re: valve seal replacing

Postby swooshdave » Mon Aug 30, 2010 10:16 am

Very nice.
If you see a post of mine and the image links are broken contact me and I'll do my best to fix them. Oh, and thanks Photobucket...
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Re: valve seal replacing

Postby cash » Mon Aug 30, 2010 11:56 am

Ludwig,
I've had my bit of kit for nigh-on 20 years it's nowhere near as well developed as yours. It started life as an old box spanner a length of screwed bar, an old spark plug and a tyre lever. I've changed a few seals etc during those 20 years and never ever thought of leaving the rocker in place. :shock:

Thanks,
Cash

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Re: valve seal replacing

Postby Hungry J0e » Tue Aug 31, 2010 12:47 pm

Very nice! Can this be flagged in technical documents or anything?

Seen here are the two special tools I used. The top is a rocker shaft slide hammer sold by Commando Specialties (and perhaps others) that I picked up awhile ago on sale. The bottom is my version of the homebrew spring compressor. Similar to the ones previously posted, basically an old rocker shaft cover with a hole drilled in the center. I also placed two jam nuts at the base of the bolts to provide wider "feet" so they wouldn't slip out when compressing. Definitely cruder than Ludwig's tool, but still works a charm.

Image

After popping off the collets, I pulled the rocker shaft and then removed the arm. As expected, the inlet valve cover was riding the valve shaft. Unexpectedly, I also discovered the inner spring was broken. This could possibly explain some of the issues I've been having with that cylinder. Paul is sending me a spare spring, even though I'm well outside the warranty period!

If I had to start all over, I would do as Ludwig recommends and pull the rocker shaft first, replacing it with a smaller diameter shaft and leaving the rocker arms in place. Not looking forward to reassembling the rocker arms and associated shims in that tight space.

Cheers,

- HJ
Last edited by Hungry J0e on Tue Aug 31, 2010 3:59 pm, edited 1 time in total.
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Re: valve seal replacing

Postby RennieK » Tue Aug 31, 2010 2:13 pm

Thanks Tons for your excellent post Ludwig! You should win a prize for adding it to the site here!

Jerry / L.A.B. a tech tool section would be great to group these things together on.
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Re: valve seal replacing

Postby preston » Sun Jan 20, 2013 1:46 pm

hi any ideas this is the second time i have the good seals with the spring the left side is good the right side keeps coming off so it smokes on decel fouling plug i have it apart dont see any thing damaged any sugg. before i put it back together thanks

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Re: valve seal replacing

Postby preston » Sun Jan 20, 2013 4:43 pm

to late put back together fired it up first kick no smoke thank goodness!!! see how it goes chow for now mike

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Re: valve seal replacement without removing head

Postby jrh2020 » Sun Dec 28, 2014 7:03 pm

I realize I am dredging up an old thread, but when I pull this up I get a message that the photos deleted on Photobucket.
Did anyone keep the dimensions on the tools from the photos when this was originally posted. I thought I had saved off a copy somewhere, but was unable to locate it. Have a plug fouling issue and suspect the seals have hardened over time.
Any help appreciated.
Jim H.
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Re: valve seal replacing

Postby ando » Sun Dec 28, 2014 11:53 pm

Jim
pm sent
ando

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Re: valve seal replacing

Postby jrh2020 » Mon Dec 29, 2014 7:18 am

Problem solved, thanks guys
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Re: valve seal replacing

Postby 850commando » Mon Dec 29, 2014 10:45 am

can't see the pics
IBA, 73commando"snoopy", 03r1100s"red baron", 05 B5.5 TDi
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Re: valve seal replacing

Postby ludwig » Mon Dec 29, 2014 11:19 am

I will see if they are still somewhere in my Photobucket and , if so , replace them .

edit : I did not find all the original pics . and I am not going to take any more .
You'll have to figure it out yourself , or PM me .
Si tous les dégoûtés s'en vont , il n'y a que les dégoûtants qui restent ..

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Re: valve seal replacing

Postby Nick_Harwood » Mon Jun 13, 2016 7:33 am

Hi, do you still have the pictures for your valve seal post?
I'd like to try your technique. Cheers.

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