help me figure out this oil leak, crankshaft seal or shifter assembly cover?

R

regder

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Bike is a 2006 Yamaha FZ6 with 65k km on it

Doing an oil change on the bike and discovered an oil leak, of course the day before I intend to head out on a 3k km road trip.

Noticed some oil residue running down towards the drain plug, so went up from there. Oil filter is dry, oil residue around the front sprocket cover, pulled the cover off and oil residue around the front sprocket. Continued moving up and noticed the shifter cover is right above the sprocket cover. Removed the shifter cover but there's no further oil seal. All the bolts except for one were tight around the shifter cover. The oil residue seems heaviest right underneath the shifter cover so I'm leaning towards that. Figure some RTV sealant should fix that up if it's the problem

Anyone seen something like this before, any more ideas?

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regder said:
Bike is a 2006 Yamaha FZ6 with 65k km on it

Doing an oil change on the bike and discovered an oil leak, of course the day before I intend to head out on a 3k km road trip.

Noticed some oil residue running down towards the drain plug, so went up from there. Oil filter is dry, oil residue around the front sprocket cover, pulled the cover off and oil residue around the front sprocket. Continued moving up and noticed the shifter cover is right above the sprocket cover. Removed the shifter cover but there's no further oil seal. All the bolts except for one were tight around the shifter cover. The oil residue seems heaviest right underneath the shifter cover so I'm leaning towards that. Figure some RTV sealant should fix that up if it's the problem

Anyone seen something like this before, any more ideas?
Click to expand...

I think you are on the right track. I have never seen this, but if that is your problem then the RTV will solve it. If it doesn't solve it than have to explore other avenues. Hard to say exactly what I am looking at when the bike isn't in front of me.
 
Definitely not chain lube as I've been using the same dupont teflon lube for a few years now. I think I'm going to clean the area as best as possible, put some rtv around the shifter assembly cover, and just keep a close eye on it from there.

Strange that it would leak from there though as there is no gasket or seal from the factory and it has never been off.
 
I cant really tell what those picture are since i dont own that bike, but it doesnt look like whatever the second picture is of shouldnt have oil there, but there seems to be a pool of oil and oil dripping down the mounting face. If thats the piece youre going to put RTV on, id suggest not to, because youd want oil to be able to leak out of there instead of getting trapped, if youre not planning on fixing the actual leak that is...
 
bobjohnson said:
I cant really tell what those picture are since i dont own that bike, but it doesnt look like whatever the second picture is of shouldnt have oil there, but there seems to be a pool of oil and oil dripping down the mounting face. If thats the piece youre going to put RTV on, id suggest not to, because youd want oil to be able to leak out of there instead of getting trapped, if youre not planning on fixing the actual leak that is...
Click to expand...

It that should have oil in there, that's where the shifter innards sit behind a cover which I took off (see here, http://www.ronayers.com/Fiche/TypeI...V_FZ6/GroupID/338077/Group/CRANKCASE_COVER_1_ #27 is the cover). I played around with it again yesterday, I realize now that there is a metal gasket that sits between the cover and the block, damn thing bonded itself to the cover and I didn't notice. I put it all back together yesterday, cleaned off the gasket and torqued the bolts to spec. I cleaned off as much of the area around it as I could get to and will keep on eye on it from here to see if it leaks.
 
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