Oil leak xt600
 

Hi, i have got a small leak at the valve cover, i cant find any gasket on the yamaha parts. Is it just a normal sealent gasket you apply? and the big question, is possible to take off the valve cover with engine in the frame? just remove all the bolts on the top or something else i need to do?

The valve covers have seals....remove and replace the seal with a new one from your friendly yamaha dealer...

I didnt explain correct, iam talking about the top of the engine, not just the small covers for the valves.

Hi !

There is no gasket on the rocker cover, The yamaha recommended sealant is yamaha bond no 1215. I used loctite 5920 silicone gasket though. Use it sparingly and yes you can get the cover off with the engine in the frame. Lots of different sized bolts. I drew the shape of the cover on a piece of card and poked the bolts through the card as they came off to help me remember where they all went on reassembly. Watch out for the "hidden" bolt at the top of the rocker cover where the engine is bolted to the frame using triangular brackets. Good luck!

Bill

THanks, so its just to lift up after removing the bolts, the tensioner case can still be in place?

Yes thats correct, Also I could undo this "hidden" bolt , but because of the

length of the bolt and the close proximity of the frame I couldnt remove it

fully until the cover was away from the bike. This is not a big problem, but I

had to place the bolt in position in the cover before replacing it on to the

engine. if that makes sense? Maybe once you`ve taken the cover off and

cleaned the old sealant off refit it dry(no sealant) and try and get this bolt

in. I forgot to do this with mine and refitted the cover with the sealant on

and had to take it all off again ,clean it up all because couldnt get this

bloody bolt in!! But eventually this method worked for me.

Great, this will be a big help for me, its hell when the sealent is on and you need to take off again..I have a old tube of loctite sealent, i recon there is no expiry date on this one? seems fine to me.

Perhaps worth mentioning also- is this worked on my bike , a 2003 model. Your model may be different? Service and parts manuals are available (on this site) for a lot of the xt variants- which will help for this and any future problems you may have.

Bill

Yes have 93mod. Have taken all bolts out, but it seem to be stuck still, have tried tapping around but still no movement..

Have you removed the difficult to see one I referred to in my earlier posts? It sits between the two lugs where the two triangular shaped frame to engine brackets bolt on.

And the one under the inlet valve cover?

Yes i got the cover up but It seem to me like its impossible to get the cover taken away from engine without lower the engine, its to tight beetween the frame, time chain is holding cover from getting out. Maybe they made some changes here in your next frame?

Sounds like there is a difference in the models then. I'm sure someone will be along with a useful suggestion Soon. Sorry I can't help more.
Bill

Your thread brings back some memories!
For a little light relief try reading this thread from 2007 - from around post number 36:-

http://www.horizonsunlimited.com/hub...em-not-27049-3

Good luck!

Ok i find this one http://www.horizonsunlimited.com/hub...der-head-22674

Maybe it was possible if i had removed carb..I did the seal with the cover liftet up, have to check tomorrow if this was any good idea or wasted time.. Thanks for the help.

Been riding alot today and it seems dry and fine, so if you dont want to remove all carb,airfilter++ you can just tighten up the cover and apply gasket. Why couldnt they give us 1cm more and the cover would have come of easy. Amazing that the original gasket seal lasted 20years, it was the thinnest line i ever seen of gasket seal.

Glad you got it sorted ! How was it getting the sealant on with the cover in place?

Compared to taking of carb + airfilter box its easy, you can do sealent in half at the time and just lower the cover. Buy sealent tube with a long plastic in front like this
https://www.google.no/search?q=plast...19%3B560%3B385

Then its easier to get in the middle around the spark plug area, and remember stick a very small hole in the tube, the tinner the better when you lay the gasket out. The most critical area is in front where the oil is at all time when running because of the angle of engine. When it leaks you get the oil right down to the exhaust and believe me its not fun when you are standing in traffic with the burned oil smoke coming up in your face..

The one problem I see that could happen when doing it that way is getting sealer on the inside when messing with the second half. A drop of Silicon plugging up an oil orifice has caused quite a few engine failures.

You never know if there comes a drop of silicon on the inside anyway when you press the cover down, its impossible to know how much is squizing out. But remember the silicon when it sticks wont get off, the original sealent was outside the edge and has been there for 20years without doing any damage. And i recon when the oil from engine is cleaned by the oil filter before it comes back into the small holes. By the way the cover is still in the air when you do the second half, use the tank holders to secure it.

The manual I used to own warned of the danger of bits of silicone breaking away inside and blocking the oilways: the pump may not push them as far as the oil filter and basically you can end up with a "blocked artery" leading to a "coronary thrombosis", using medical terminology.

I dont know what you mean by bits, the sealer is like glue and sticks to everything you get in contact with. You can buy a fiber cam and check edges if you want to be shure how the inside edges looks like, but i wont!