When and where to use the sealant

I have used hylomar and yamabond with great success on all my bikes....with or without gaskets. Case halfs get no gaskets, so as mentioned earlier, true mating surfaces and properly cleaned are part of a leak free seam.

Jeepers! (Does that translate well?)

RTV is a great gasket maker. But it has a well documented history of being liberally applied, squeezing out into places it doesn't belong and then coming free to block oil passages. Be very careful in its use! Primary cover = good idea. Engine cases = bad idea!

Russ

rvich said:

Jeepers! (Does that translate well?)

RTV is a great gasket maker. But it has a well documented history of being liberally applied, squeezing out into places it doesn't belong and then coming free to block oil passages. Be very careful in its use! Primary cover = good idea. Engine cases = bad idea!

Russ

Click to expand...

+1
RTV was/is great stuff. There much better choices now, Loctite 518 or Yamabond #3 are two top picks. 518 has the advantage of not curing when excess is squeezed out. NO STRINGS to plug the oilpassages :idea:

My choice of sealer for the crankcases was Loctite 518. I chose it for its flexibility. I did notice that excess sealer that squeezes out of the joints does not set, as concours said. I see that as a good thing.
Because my cases had been broken and welded up, I spent a lot of time making the surfaces fit together as well as I possibly could. I used bearing blue to check how well they mated. I scraped some high points down, and I built some low points up with JB weld.
When I got them as good as I could with the bearing blue, I found that I could still detect very small gaps by shining a strong light through the joints. I used this method to improve the fit even more.

For places where gaskets are used, my preference is to make the mating faces as good as possible and only use grease on the gasket.
Buon Anno
Martin

Thanks to everybody.
I will use Wellseal, not because is the best seal, but only because was the item more easy to buy on ebay.
For the other brand, was not easy to receive by post: someone of sellers wrote to me it was not posible to ship airmail because the product can burst???????? !!!!!!!!!!!!
An happy new year
Piero