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oil in crankcase
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dienelt1
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November 3, 2018 - 5:30 pm
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Has anyone had problem with gearbox oil being sucked into the crankcase  

and causing the engine to 4 stroke , I fitted the new type of engine seals just

3 years ago ,so at the moment I.m  a bit deflated to say the least! Having experimented

with automatic oiling, fitted a drilled screw in the crankcase  ,with a tube

connected and the other end in a bottle of 2 stroke oil the suction being 

quite considerable ,so are the crankcase seals  fitted the wrong way around!

any views appreciated.

  Diene.

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johnsullivan
east sussex
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November 4, 2018 - 12:16 pm
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was it ok then this started? Iwonder if the crankcase screws need retorquing?

67 D10. and a D7    2007 Honda Hornet FA. Suzuki 89  DR 250S, Sinnis SC 125. 78 Honda 90  75 Montesa Cota 247

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sunny
Norfolk
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November 4, 2018 - 3:46 pm
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wots   a  new  kind   of  oil seal   look   like   ?       the  steel  side   of   the  rubber &   steel   seals  always   face  outward  from   the   center   line  of wotever   its  fitted    in          , apart  from  the  much   older   seals  made  with  leather  & steel  you  have  to  be  more  cearfull   with  them 

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dienelt1
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November 4, 2018 - 5:55 pm
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I meant a viton rubber seal ,but things might not be as bad as I first thought.

For some reason the carburettor started playing up! with  engine receiving to much fuel,

 chugging when I could get it started,  with turning the fuel tap off the engine revs 

returned to normal, so leading me to think of a float needle issue. after removing the 

carb and examining it could find nothing amiss ,just a small pit where the needle presses 

on the float, so nicked one of the wives hair clips which just had the right sized piece of the clasp

to fashion a small u piece to fit on the float and  try tomorrow ,what made me think oil

was finding it's way into the crankcase , the gearbox oil level was quite low,

 

Diene.

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nickjaxe
Runcorn Cheshire UK
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November 5, 2018 - 5:23 pm
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Not just the crank oil seals that stop the gearbox oil finding its way into the crankcase...the sealing compound between the case half's may have broken down...what type sealing goo did you use.

Was it blowing lots of blue smoke out of the exhaust?

Nick.

My Bantam video              https://www.you.....jpOFmzRZRI

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dienelt1
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November 5, 2018 - 6:36 pm
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Hi Nick , after bodging  the carbs float,the engine revved quite normally. 

so hopefully not a leaky seal issue ,keep an eye on the gearbox oil level though.

Have ordered a float and needle which I hope will fix things .

the crankcase sealant   used is the stuff rex sells .

 as to why the carb should suddenly start flooding is a mystery to me.

who ever would think bantams could be so fickle !

Diene.

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nickjaxe
Runcorn Cheshire UK
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November 5, 2018 - 10:31 pm
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Hi Dienelt.

Worth opening the crank case drain on its base every time you have done say 50 miles or so...just to see if any oil leaks out...if it going down in the gear box and its not leaking on to the floor its going somewhere.

Yes they can be fickle cant they....but I love to tinker with mine.

My Bantam video              https://www.you.....jpOFmzRZRI

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jolon1
Leigh Lancashire
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November 13, 2018 - 5:10 pm
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Surely, as nick has said, if oil is getting into the crankcase, from the gear box, you would be getting piles of blue smoke from the exhaust. Also some would leak from the exhaust manifold.  

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