Clymers M411 page 61...

[planedick]

If you know whats on that page, you know what I'm doing this week. Good thing I have this week and next before my ride. I'm lucky too, because there is a dealer close by who will have the parts I need and SWMBO works within two blocks and can pick up parts on the way home from work.

I went to Steve's yesterday and developed a leak big enough to leave a stain on my pants leg.

[cajun31]

Enlighten us

I don't have the manual handy. What is it that your working on?

[prometheus578]

I went to Steve's yesterday and developed a leak big enough to leave a stain on my pants leg.

I really don't think I need to hear more about this.
Maybe the manual you need is the Merck Medical Manual?
Check the section on urinary tract infections?
Gastro-Intestinal?

[prometheus578]

page 61 deals with removing the cylinder head.

"What ya got goin' on, PlaneDick?"

[mro]

First part about engine removal and re-install,
second about head,
third has pic of pet-cock.

If your getting wet from your pet-cock....
would get a longer leash


mro

[planedick]

Head...

It's a leak around the head gasket, and oil seeping out and blowing around the head and on my pants leg. Shoulda known Prom would jump in with the off hand, outta context remarks. LOL I think he has to take his mind outta the gutter so mine can float by. He He He

[mro]

out a curiosity

have you tried to re-torque the head?


mro

[MAXIMAN]

planedick

If the head gasket is leaking you should hear it. It will be chirping...very loudly. About the only place for it to leak "oil" would be in the area of the cam galley. Other than that it would be leaking air and you'd hear it.

Odds are it's leaking somewhere else. If I were you I'd first check:

1- Cam chain tensioner
2- Valve cover gasket and cam plugs

If it is leaking out the head gasket around the cam chain galley tightening alone may not stop the leak. You may have to replace the head gasket.

[Pat Kelly]

MyE has a leak of the cylinder base gasket right below the cam chain tensioner. Slathered it with RTV and it held for about 2 years. I see it's time to reapply.

[planedick]

Found out why

Well, I got the head off and discovered why it was leaking. There was no chain cavity gasket. According to Clymers and Haynes there is supposed to be a special gasket with tabs around the chain cavity. The leak was from the area where the two head bolts go down in the center front and back and it was leaking out the front in this area. I suspect because the lack of proper seal in that area because there was no chain cavity gasket.

Cylinder walls and pistons are in really good shape, smooth as glass, no scratches, no piston slop, not much carbon build up. It did have 150 lbs compression straight accross before the teardown. No head warpage or signs or any damage at all.

I do have some issues with valve gaps. I have done the math, plus Haynes has a neat chart for pad sizes. I have lots of pads, but of course not the ones I need. I need 2 ea 270's and 1 ea 275, I have 4 - 260, 1 - 255, 4 - 265, 1 - 300, 2 - 290, 2 - 280, and 4 - 285. I'm going to try to find someone local to trade with so I can get it going right away. Hopefully the local Yahama dealer will trade pads with me.

[TopCatGr58]

Hey Dick,

Don't know if you know this, but all of the head gasket/engine sets I've seen have ELIMINATED the cam chain oil galley gasket anyways?! Unless I'm remembering it wrong, and that they may put it in the set, but in the later model engines, it's not used!? Can someone clarify??

Sorry, can't help with the shims, good hunting/swapping!
T.C.

[GNEPIG]

Quote from TC:
Hey Dick,

Don't know if you know this, but all of the head gasket/engine sets I've seen have ELIMINATED the cam chain oil galley gasket anyways?! Unless I'm remembering it wrong, and that they may put it in the set, but in the later model engines, it's not used!? Can someone clarify??

Clairified: I use those same gaskets that TC is talking about.
I'm not sure that they are as good as the old ones, as I have a leak there also and it's only been a year since I replaced it. I will try some Yamabond on the next one(in moderation and just around the chain galley).
Maybe Yamaha still sells the origanal type, but I bet they would be expensive.

[skids]

Yamaha stealership told me that the separate cavity seal was eliminated.

[mro]

Have changed a few head gaskets.
None have leaked as far as I know.

Do not try to add a "chain cavity gasket" to a head gasket that does not come with it.
New head gasket fills in the area where OEM cavity gasket was and you will damage head when tightening it down.

OEM cavity gasket was metal with a rubber covering, so adding a thin coat of Yamabond there won’t hurt but should not be necessary.


mro
now watch and next week I'm gone to get a few calls bitching about leaky head gaskets and mine are just going to start squirting too....

[prometheus578]

Everyone is correct. The cavity gasket had been eliminated.
I found that on the microfiche the next morning after I tried to reuse it and snapped off a chunk of aluminium from the front of the cylinder. (JBWeld and Permatex)