Experimental TEFLON Crankcase Seal / Nc250/Zs177mm

[Co2]

Zs177mm/Nc250 moto block crankcase has not have metal or paper or.. a seal, just i see on surface very thin probably slikon / or high temp plastic seal trace .

Many forums,and my friends sad replacement crankcase seal methode(if not find, fabricated original seal) slicon applicated , offcourse me too try that , but crankcase in surfaces very thin , and i fear if much more applicated that slicone=very badly engine damaged/blocked oil pump/bearings/oil channels/filters/gears, and i just tested 2x time slicone.


Very thin applicete slicone+sponge , my moto master friend sad, use a sponge and very very thiner app slicon , and vibrated+impacted sponge slicon seal is form better thin than a paper , i make that and test again screws mounted waiting dry = crankcase in , badly situtaion (out case not important ofcrs.) failed.


İnside of crankcase better leak.

Slicon seal not for me, i understand , but i need a seal material, perfect temperature , oil strenght , what is material what is... think think ... happy end , i find that TEFLON band...



Used a 19mm Teflon band , making double layer , and roll thread , crankcase in applied , Teflon thread and aluminium surfaces incompatible , just need very low profile applied a glue(glue type is dry soft glue, not Japan type, or steel type.)


This methode is experimental think.. , my moto need refesh paint+eectrical replacement , proobably 2 weeks or more time need completed, after i returned here and writied here , i hope this methode is ok.

Never try this methode , just wait my test results.

[jimjr21]

I have never seen teflon tape used in this capacity in over 30 years of engine rebuilding.

Personally I use Wurth brand Flange Sealant Green. It was developed for Rolls Royce aircraft engines to seal machined surfaces.

I most commonly see engines with Yamabond or Hondabond sealing them. Again products designed to properly seal an internal combustion engine coming in contact with oil, fuel, coolant, etc.

I will be looking to see your results. I hope they are positive.

I worry that the tape rolled will have too much thickness and distort the machined tolerances and alignment.

[SpudRider]

I have seen gaskets for the ZS177MM (NC250) engine sold at Taobao. However, I don't remember seeing a gasket for mating the crankcase halves.



https://item.taobao.com/item.htm?spm...cket=12#detail

[SpudRider]

Originally Posted by jimjr21

I have never seen teflon tape used in this capacity in over 30 years of engine rebuilding.

Personally I use Wurth brand Flange Sealant Green. It was developed for Rolls Royce aircraft engines to seal machined surfaces.

I most commonly see engines with Yamabond or Hondabond sealing them. Again products designed to properly seal an internal combustion engine coming in contact with oil, fuel, coolant, etc.

I will be looking to see your results. I hope they are positive.

I worry that the tape rolled will have too much thickness and distort the machined tolerances and alignment.

Jim,

Can you recommend any of the Permatex gasket makers?

http://www.permatex.com/products-2/p.../gasket-makers

[Co2]

Originally Posted by jimjr21

I have never seen teflon tape used in this capacity in over 30 years of engine rebuilding.

Personally I use Wurth brand Flange Sealant Green. It was developed for Rolls Royce aircraft engines to seal machined surfaces.

I most commonly see engines with Yamabond or Hondabond sealing them. Again products designed to properly seal an internal combustion engine coming in contact with oil, fuel, coolant, etc.

I will be looking to see your results. I hope they are positive.

I worry that the tape rolled will have too much thickness and distort the machined tolerances and alignment.

Amazing experience sir , i'm just trust crankcase in surfaces layers very sharpness and flat build , and first time demntage crankccase seeing original seal remainder has very thick.

Photos first try's , latest version better visual and reasuring ,smooth.

İhope to, that methode succes... if failed 4. time demontaged moto block

[Co2]

Originally Posted by SpudRider

I have seen gaskets for the ZS177MM (NC250) engine sold at Taobao. However, I don't remember seeing a gasket for mating the crankcase halves.



https://item.taobao.com/item.htm?spm...cket=12#detail

Yes not original gasket , i think/probably in crankcase surfaces very grift much more cuted surfaces multiple layers = hardjob

Gaskets on picture, little camshaft tensioner , cylinder up+down , clutch decorative case, waterpump ,stator case , and bigger right crankcase side gasket's.

Sorry worng word of topic "Seal" , " Gasket bettter.

[humanbeing]

The chinese stuff: http://www.huitian.net.cn/product_intro.asp?id=141

[Weldangrind]

I've used Three Bond and Loctite 518 with good results.

[SpudRider]

Originally Posted by Weldangrind

I've used Three Bond and Loctite 518 with good results.

I really like the Permatex Ultra Black RTV. I use it for a variety of purposes. Which of the Permatex products do you think would work best to seal the two crankcase halves?

http://www.permatex.com/products-2/p.../gasket-makers

[SpudRider]

I did a little research, and a lot of people swear by Permatex Ultra Grey.

http://forums.g2ic.com/showthread.ph...ndabond-vs-RTV
http://www.k20a.org/forum/showthread.php?t=94798

http://www.permatex.com/products-2/p...t-maker-detail

[Co2]

Hmm , my that project started i fear in the crankcase owerflow all semifiluid gasket materials , and blocked any actioned in motor parts fear , that all semifuid materials finded easy , but crankcase two surface closed very sharp/thick surfaces , if any semifuid used 100% owerflow in motor.

Probably first montage from moto factory using a robotic gasket aplication, and perfect montaged, first demontaged crankcase surfaces very very thinner gasket how i can description idk probably gasket material thickness 0.01 -0 .03 mm maximum all effort so that , leaked semifluids.

İ hope , that semi elastic material, tolarated that problem i hope.

[jimjr21]

Originally Posted by SpudRider

Jim,

Can you recommend any of the Permatex gasket makers?

http://www.permatex.com/products-2/p.../gasket-makers

Any of those products will work to seal the crankcase.

As others pointed out the gray is a good all around choice.

[Mudflap]

My favorite is Loctite 518 or whatever Permatex calls it nowadays. I used it for years on motorcycle crankcases, Rotax aircraft engines, washing machine transmissions, and everything else that did not need the spacing of a paper gasket.

[Weldangrind]

Originally Posted by Mudflap

My favorite is Loctite 518 or whatever Permatex calls it nowadays. I used it for years on motorcycle crankcases, Rotax aircraft engines, washing machine transmissions, and everything else that did not need the spacing of a paper gasket.

X2.

I've had similar results with Three Bond. I would not use silicone.

[SpudRider]

Originally Posted by Weldangrind

I've used Three Bond and Loctite 518 with good results.

Originally Posted by Mudflap

My favorite is Loctite 518 or whatever Permatex calls it nowadays. I used it for years on motorcycle crankcases, Rotax aircraft engines, washing machine transmissions, and everything else that did not need the spacing of a paper gasket.

We have two respectable votes for Loctite 518.

http://www.loctite.co.uk/loctite-408...=8802626633729