sealants

[rbig1]

Ok I know rtv is corrosive to alum, so what are you using on cam cover. Where the half moon is. Don't want to pit the machined housing. BEEN a long time since went to seminar on correct sealants. A lot of you will think I'm crazy about this but have seen the damage first hand

[cowpuc]

Have tried many of em over the years Rodney and, IMHO, Yamabond #4 is the best of the best.. Doesnt foul, swell or break up from oils or gas. Drys flexible and seals like WOW!! Gotta hunch that its what Mom Yam uses in her factory factory case sealing. VERY friendly with aluminum!! Word of advice brother (and I know you know this but thought I would put it up here in case someone else reads this that doesnt know this).. Because Yamabond #4 does not break down, if you get to much on "the crush" and it over laps and happens to get into oil passages it WILL cause a problems.. Use the stuff sparingly - just a nice light smear works AWESOME!!

As with all sealants, make sure every thing is oil free and clean, smear both halves with a light smear, let dry to tacky (dont take long - be ready) to slip it together... Lots and lots of old - came OEM pre-70's oil leakers left my shop as a "WOW - NEVER KNEW NORTON MADE A BIKE THAT DIDNT LEAK" motorcycle because of Yamabond #4 !

[rbig1]

Have seen some old equipment with what looked like they used a whole tube on one gasket. And some that didn't put gasket in. It will plug the oil passages. Got a used payloader at the shop. Found it had a leak in the hyd valve. They had put a bunch of oil dry in frame cavity to keep oil off floor. Someone had pulled the seal off the spool put in a o-ring with blue rtv in place. What a surprise???? why.

[Zzyzx]

What are the thoughts about using Permatex MotoSeal 1

I've used it in the past but wondering if Yamabond 4 is safer or better?

[Daveand Barbie]

I don't have any real world experience with Yamabond, but do have a bunch of years experience with Hylomar. It was originally manufactured by Rolls Royce for use in assembling Continental aircraft engines. Like Yamabond, it doesn't harden, you only need a light coating, and after a number of years, upon disassembly, you can wipe it away with a rag dipped in lacquer thinner.

 

I used it most recently on the O-ring seals in the rotary engines I built for my race car.

 

I understand and that someone like Permatex bought the US rights to it and is now selling it. I don't know if it is the same formula that I bought from the mechanic at the airport.

 

It might be worth looking in to if you don't have any other good source for Yamabond.

[Jayceesfolly]

You can buy Yamabond 4 on Amazon............about $13.00 a tube.

Didn't check fleabay, but should find it there, also.

 

 

Jim

[saddlebum]

My personal favorite is a product called "the right stuff". Most auto parts suppliers carry it.