NO Gasket?

[sm7482]

SO i split the crank cases on my 74 kawasaki g5 because im going to replace all the seals and i have to clean up the crankshaft cavitie, looks like the powder coat/paint the factory sprayed on started pealing off from the gas and oil eating at it. Anyway as soon as i split the cases the first thing i relize is that theres no gasket :yikes: . theres no remains of gasket material whatso ever. I thought maybe it deterierated because the same thing happened to the cylinder base gasket but when i looked at a parts diagram of the crank cases it doesn't show a gasket either :ohmy: . what keeps the gear oil in? am i supose to rtv seal it or what? would it hurt to make my own gasket?

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[dirt bike dave]

Many old bikes do not have gaskets between the crankcase halves.

I would not make a gasket, but I would research the best sealer for your application. I think Yamabond has several gasket sealers made for Yamahas. there is probably one that is suited for crank case halves.

 

[sm7482]

really? what keeps the oil from leaking, or the compression of the piston pushing fuel into the gear oil? now that you mention it, there is a rubber type material on some parts of the halfs

 

[_JOE_]

Go to the local bike shop and tell 'em what you're doin. They'll know what to give you.

 

[sm7482]

yeah or ill call em. but im assuming i dont need the same brand for my bond right? ex. theres yamabond i also found hondabond but not a kawibond(assuming thats its name) the yama and hondabond look like there from the same company.

 

[_JOE_]

Yeah, any will work.

 

[Screamn200]

I always use yamabond on my bikes, works great.

 

[whenfoxforks-ruled]

Thats a well machined set of cases. Do not meddle. Bye bye trans tolerances if you get a few thousandths to wide, and no more trans! All the oems make the proper sealant. Read, and follow the directions.

 

[sm7482]

YEah but if yamabond, kawibond, hondabond all do the same thing, can't i just pick up a tub of any of the three? yamabond i can get for 7bucks but the kawi oem stuf sells for $30 :yikes: http://store.albaaction.com/shop/ACC-YAMAB-ON-D4.html that place sells yamabond and honda bond at diffrent prices but gives the same directions. but the kawasaki oem sealent is 28bucks! part # 92104-1003.

 

[IndyMX]

I doubt that the bike or the sealant will know the other is not the same brand.

SO i split the crank cases on my 74 kawasaki g5 because im going to replace all the seals and i have to clean up the crankshaft cavitie, looks like the powder coat/paint the factory sprayed on started pealing off from the gas and oil eating at it.

I've never heard of anyone painting the inside of an engine.. What exactly would be the purpose?

 

[sm7482]

I doubt that the bike or the sealant will know the other is not the same brand.




I've never heard of anyone painting the inside of an engine.. What exactly would be the purpose?

exactly my question, but look at the pixs, theres paint. Even in the trans area.

 

[IndyMX]

exactly my question, but look at the pixs, theres paint. Even in the trans area.

I suspect that was not done at the factory..

 

[dirt bike dave]

I think the purpose of painting the inside of the transmission cases would be an attempt to reduce oil contamination. If the paint flakes off, the attempt back fired.

Considering how easy and cheap it is to change the gear oil, it does not seem worth the trouble.

 

[sm7482]

i think it was factory painted. i wasn't going to clean the tranmission area, just the crankshaft cavitie. the gas started eating at it and the piston shows the burnt paint. wouldn't hurt cleaning it.

 

[whenfoxforks-ruled]

Never recall it painted that well, usually appears to be over spray. That price difference is probably do to the amount of silicone in it.

 

[sm7482]

thats a good point, but still if i can use yamabond and it will work just find, why spend 30 bucks.

 

[whenfoxforks-ruled]

It should be fine. That straight silicone stuff is messy and not from 1974.

 

[2strokerfun]

I've seen paint like that in a lot of the older elsinore engines I've pulled apart. It is from the factory. It seems to be overspray they didn't care about. Never hurt anything that I've ever seen.
Silicone will often break down from gasoline exposure. Stick with Yamabond, Threebond, Hondabond or Kawabond. Extremely thin, thin coat is what you want. You are really only using it because of imperfections in the metal.

 

[2stroke]

Yamabond will do the trick. Ive used it for the last 15 or so years on all of my Kawasakis, and its only $7.95 at my local dealer. Silicone will not work. The correct sealants are "semi drying"

Umm, as for the paint...the transmission area stuff is overspray...

The crap in crank area is probably mostly carbon buildup..blow by from worn rings can do this. notice how the intake side with the rotary valve port has more of it. Just scrub it out.. There is no need or reason to paint that area and if the factory got some there, it was not on purpose.