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excessive oilspill from airbox excessive oilspill from airbox
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 30 Nov 2009
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excessive oilspill from airbox
hi all,

somewhere between mendoza and santiago my TTR started developing a new issue: it spills a lot of oil from the airbox.

from the searchengine on HU i read there's two basic causes for this: warped valvestemseals and/or pistonring leakage. am i right?

i recently checked the compression and it showed 9.0-ish (engine ambient temp). also, i don't seam to have lost a lot of power. so thats a good sign right??

any other stuff i can check before opening up the top-end?


thanks for any suggestions.
sanderd.
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Old 30 Nov 2009
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First check the engine crankcase breather return pipes and any other engine breathers, to make sure they aren't blocked. If you've been doing some shorter runs in cold/damp weather, condensation can emulsify the oil & make it sticky & can block pipes, etc.

If you've topped the oil up recently, re-check the level, coz too much can cause this problem.

Its more likely to be ring bypass, which pressurizes the crankcases, and a compression check is only valid on a HOT engine:

Pressure under compression:
Standard 1,100 kPa (11 kg/cm2, 156 psi)

Minimum 900 kPa (9 kg/cm2, 128 psi)
Maximum 1.200 kPa (12 kg/cm2, 171 psi)
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Old 30 Nov 2009
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hi Pigford,

thank you for your reply. the oillevel is not the problem, it's at the bottom of of the glass in the oiltank. i normally top it up till the top of the glass, doing this for a long time without problems.

The manual doesn't state if the compression should be checked with hot or cold engine. Can i assume that if i have a 9.0 compression with a cold engine, it will be higher when hot?

I'll check the breathers. There's two, one from the cranckase leading back to the oiltank and one from the geabox (i think) leading to the airbox.

I'm in Pucon right now, and there's nothing here, so i'm contemplating to get to Osorno, i know there's a workshop there. I was thinking: To prevent any oilspill, is it a good idea to seal off the breather hose to the airbox thus force the oil to go through the crankcase vent back into the oiltank? Or is this a bad idea?

Thanks,
Sander
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Old 30 Nov 2009
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Compression test when HOT - as stated in my last post (lol).

If you start blocking vents, it may compound any problems, coz if it is pressurizing, the build up will have to vent somewhere, and could blow a gasket or seal ?
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Old 30 Nov 2009
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yeah, i realize that. just thinking about a way to cover about 250kms, preferable without leaving an oiltrail ;-)

otherwise i just have to tap the oil every 100kms from the draintube at the bottom of the airbox.

i just stopped raining, good moment to check the venthoses....

2bc-ed..

cheers,
sander
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  #6  
Old 30 Nov 2009
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Catch tank?
Sanderd,
Just a thought.If you're worried about to much oil venting into the airbox, why don't you route the breathers into a temporary catch tank?
Mark
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