Exhaust valve oil seal

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Exhaust valve oil seal

Postby feraboy » Tue Aug 01, 2017 5:17 pm

1998 ZZR600 E6. No 3 cylinder's plug oils up in seconds after cleaning. Been diagnosed as Exhaust valve oil seal failure. Haynes manual says engine needs to be removed and split to remove the head. Does anyone know if this is correct, or can I take the head off without taking the engine out of the frame?
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Re: Exhaust valve oil seal

Postby Brett » Wed Aug 02, 2017 1:00 am

You can go one better: you can change the stem Seal without removing the head!
Some people suggest using compressed air to keep the valve shut but I prefer (and have used) a piece of (new/clean) nylon ski-rope in the combustion chamber, then turn the engine do the piston pushes the rope up against the valve seat. Then remove the retainers and springs (you'll need a lever type spring compressor and a bit of creativity), and swap the seals.
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Re: Exhaust valve oil seal

Postby feraboy » Wed Aug 02, 2017 9:32 am

Thanks, sounds too easy. would you know if there is a difference between inlet and exhaust seals?
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Re: Exhaust valve oil seal

Postby Brett » Thu Aug 03, 2017 3:48 am

It's fiddly, but not taking the head off is a big win if the engine is otherwise okay.

Not 100% sure on if they are the same or different in these engines, but they certainly are different in many car engines (exhaust seal garter springs are black on the exh and silver on the inl - temperature ratings I guess).

Look on YouBoob - there are a number of demos of the technique on car engines.

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Re: Exhaust valve oil seal

Postby Confusion » Thu Aug 03, 2017 10:11 pm

feraboy wrote:Thanks, sounds too easy. would you know if there is a difference between inlet and exhaust seals?


http://www.kawasakioriginalparts.com/ro ... country=GB

Looks like the same seals are used for inlet and exhaust side.

92049-1308 SEAL-OIL,VALVE GUIDE
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