Experimental TEFLON Crankcase Seal / Nc250/Zs177mm
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... http://i.hizliresim.com/qRmDM5.jpg 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. |
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. |
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://gd1.alicdn.com/bao/uploaded/...0-item_pic.jpg https://item.taobao.com/item.htm?spm...cket=12#detail |
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Can you recommend any of the Permatex gasket makers? http://www.permatex.com/products-2/p.../gasket-makers |
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Photos first try's , latest version better visual and reasuring ,smooth. İhope to, that methode succes... if failed 4. time demontaged moto block:grr: |
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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. |
The chinese stuff: http://www.huitian.net.cn/product_intro.asp?id=141
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I've used Three Bond and Loctite 518 with good results.
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http://www.permatex.com/products-2/p.../gasket-makers |
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 http://shop.advanceautoparts.com/wcs...4_pri_larg.jpg |
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. |
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As others pointed out the gray is a good all around choice. |
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.
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I've had similar results with Three Bond. I would not use silicone. |
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http://www.loctite.co.uk/loctite-408...=8802626633729 http://hybris.cms.henkel.com/medias/...8531026974.jpg |
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