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Old 02-25-2011, 10:55 AM   #1
rudolf35 OP
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Question Airhead pushrod tube seals

This might be a silly question but why does one need to use a tool to seat the pushrod tube seal with a older airhead? I know I can make the tool with a 1/2" pipe but the reason escapes me - enlighten me.

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Old 02-25-2011, 11:45 AM   #2
crazydrummerdude
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I've never needed a tool for my seals.
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Old 02-25-2011, 12:28 PM   #3
squiffynimrod
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Wouldn't that be the metal collar (?) on the older PRT's that you could cinch down a bit if they were weeping? Newer PRT's had a brazed collar that if you tapped them would break and leak even more. Is this for the 71?
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Old 02-25-2011, 01:15 PM   #4
Grider Pirate
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Quote:
Originally Posted by squiffynimrod View Post
Wouldn't that be the metal collar (?) on the older PRT's that you could cinch down a bit if they were weeping? Newer PRT's had a brazed collar that if you tapped them would break and leak even more. Is this for the 71?
That's always been a very temporary fix at best. Spending a few bucks and a morning replacing the seals is a better solution. No special tools required, and it doesn't take very long at all.
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Old 02-25-2011, 01:48 PM   #5
CurlyMike
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sent you a pm. Please check...
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Old 02-25-2011, 04:26 PM   #6
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Originally Posted by Grider Pirate View Post
That's always been a very temporary fix at best. Spending a few bucks and a morning replacing the seals is a better solution. No special tools required, and it doesn't take very long at all.
Temporary fix? Yes but it's also a reasonable solution to a frequent problem.

I've been able to reseal my PR seals using a seal setting tool and a hammer on many occasions and thereby extend the usefulness of my old seals for more than a year. It took maybe 1/2 hour to make the tool, the materials cost was zero, c clean bike? Priceless!.

I learned the trick from a trained BMW mechanic, who would always tighten up his customers seals during a regular service stop, if they showed need of it. That way, his customers could put that job off until it was time to schedule more extensive repairs, thus saving them time and money, while it also saved him time and made him money!

Nothing wrong with that!
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Old 02-25-2011, 05:10 PM   #7
4ad
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These seals wear from constant expansion and contraction during the heat cycles of the engine. If you compare a new seal to an old one you'll see the ridges on the base are worn completely smooth on the old one....no amount of hammering will do much good for long and MAY even pull the pushrod tube from the cylinder....a pain to replace....and involves an angry wife wondering what the f&%k a cylinder is doing baking in her oven and stinking up her kitchen.

Besides...it's bad karma to hammer on an airhead.

Go ahead and change em...takes a 1/2 hr per side..and thats if you're slow.
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