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mf746

Oil disappeares from sight glass

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2012 yz450f new cylinder piston rings gaskets, oil comes up in site glass then as its idlling slowly goes away... Any ideas? Where does it go? Possible clogged internal lines? HELP!!

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It gets sucked out of the case and transferred throughout your engine.  That's how it works.  When you turn the engine off, it stops circulating and pools in the bottom.  Once it has pooled, you use the check glass to check the level.

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That's kinda what I thought but. I was sure I could see it in there before maybe I'm just being paranoid

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When the engine is idling or running a large amount of oil is up in the head and various passages when the engine is shut off it goes back down into the sump , it would be a bad sign if oil didn't disappear from the sight glass as it would indicate low flow or over filing .

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When the engine is idling or running a large amount of oil is up in the head and various passages when the engine is shut off it goes back down into the sump , it would be a bad sign if oil didn't disappear from the sight glass as it would indicate low flow or over filing .

 

The problem with this description is that the oil in the sump doesn't show on the sight glass, which is simply because the sight glass is located in the "tank" section of the crankcases and not the sump. 

 

It's a dry sump oiling system.  Oil is removed from the storage volume where the sight glass is by the feed pump, and delivered directly to the lube points in the engine.  From there, it drains back to the sump where it is picked up by the second, higher volume return pump and returned to the "tank".  While running, the level may rise and fall a visually significant amount depending on how well the sump happens to be scavenged out at a particular moment, and can really only be accurately read in the glass with the engine shut off.

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The problem I'm having now is its not showing up in the sight glass whatsoever. I made sure there was the exact right amount in the engine and it still won't appear. At all.

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What a dumb design I my opinion..I'm just gonna measure it going in and call it day..but then I won't know if I'm losing oil

Edited by Chansharp

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Jcm yessir, following it exactly, have since the bike was new. I raced IXCR series for two years changed it every race I got the procedure down

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