What type of gasket maker do i use on the crank?

[icebooger]

Hi board im a lil confused on what product i should be using when re-sealing the two Crank shaft halves together on a 340 twin rotax motor? I Was gonna just try and use high temp orange RTV silicone?
Will that work? i did ordered new crank seals for both sides and new rings!
But i noticed the crank shaft halves look like they have thin layer of a grey colored gasket maker of some kind? Would like to find out what that grey stuff is called? Anyone?

thanks icebooger!

[moosemeat]

hi ok just to let you know i have used normal orange/bronze High temp RTV silicone with no troubles yet,
everyone will say no! no! no! to RTV silicone of course...
But here you go i got 6 years on a 440 rotax motor i rebuilt with no problems yet! ..No crank leaking problems at all..
Make sure when you pick out the silicone the heat range is high enough and is oil resistant and then just a ***very fine super thin layer of silicone on both crank case halfs on both sides
***make sure its spotless clean before you apply it..
and let both sides of the crank halfs dry a lil before putting together..
You will be good to go..!

best i can advise or some guys use yamabond or hondabond or motoseal1
all will work excellent and even high temp RTV Silicone!

by the way works well on outboard motors too

Yep good old High temp RTV silicone to the rescue..

Moosemeat

[sledpuke]

Hondabond or Yammabond good stuff and is recommended by the Pros!

[ScoobyDoo519]

Jan 21, 2014 4:55:33 GMT -5 moosemeat said:

hi ok just to let you know i have used normal orange/bronze High temp RTV silicone with no troubles yet,
everyone will say no! no! no! to RTV silicone of course...
But here you go i got 6 years on a 440 rotax motor i rebuilt with no problems yet! ..No crank leaking problems at all..
Make sure when you pick out the silicone the heat range is high enough and is oil resistant and then just a ***very fine super thin layer of silicone on both crank case halfs on both sides
***make sure its spotless clean before you apply it..
and let both sides of the crank halfs dry a lil before putting together..
You will be good to go..!

best i can advise or some guys use yamabond or hondabond or motoseal1
all will work excellent and even high temp RTV Silicone!

by the way works well on outboard motors too

Yep good old High temp RTV silicone to the rescue..

Moosemeatthe reason your not suppose to use silicone heat treated or not the fuel mixture will eat the silicone and it will fall off in chunks and get in your bearings get into your combustion chamber needle bearings and so on it is not recommended to use silicone for this reason silicone and gas does not mix and if anybody says they use it all the time are just getting lucky i have rebuilt my motors that are ruined by some one using silicone as a top and bottom halve seal

[jiggyjoe]

howdy scoob welcome to the site

and ya that makes good advise i hate to see a nice rebuilt motor
being messed up with silicone..But in pinch i guess it would work..

[moosemeat]

Feb 13, 2014 8:45:29 GMT -5 jiggyjoe said:

howdy scoob welcome to the site

and ya that makes good advise i hate to see a nice rebuilt motor
being messed up with silicone..But in pinch i guess it would work..

yeah BUT NOT ALL SLOPPED TOGETHER A NICE FINE FILM not over used RTV silicone,,
I disagree i have used it over the years and all still runnning strong..even rebuilt one twice no signs of breakdown


but then again my silicone film finger work layers are very fine when squished no excess squishing out,,...