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CG125 Leaking Engine Oil- Cracked Crank Case

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crazymotorbik...
Nearly there...



Joined: 05 Mar 2006
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PostPosted: 23:11 - 27 Sep 2012    Post subject: CG125 Leaking Engine Oil- Cracked Crank Case Reply with quote
Hi,
I've just finished fixing the fork seals and clutch on my little CG125.

Before i fixed the clutch oil weeped slightly from the bottom of the casing and a small area of oil would normally form over night under the bike.

After rebuilding the clutch and replacing the casing it still bloody leaks!! A new genuine gasket was used and both surfaces were spotless.

It doesn't leak enough to cause a serious problem. IE Seizure. Will it pass its MOT leaking a small amount of oil?

Cheers,
Shaun R.

Last edited by crazymotorbiker on 20:12 - 29 Sep 2012; edited 1 time in total
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DMCpro
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Joined: 16 Jul 2012
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PostPosted: 23:26 - 27 Sep 2012    Post subject: Reply with quote
MOT is for road safety. if it causes a hazard it should fail.
leaks arent really what an mot tester is looking for though, you should really try and get it sorted, next time use a bit of gasket sealant.
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P.addy
Red Rocket



Joined: 14 Feb 2008
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PostPosted: 23:28 - 27 Sep 2012    Post subject: Reply with quote
DMCpro wrote:
MOT is for road safety. if it causes a hazard it should fail.
leaks arent really what an mot tester is looking for though, you should really try and get it sorted, next time use a bit of gasket sealant.


You really are a gimp.

Any leaks will fail an MOT. Not being able to contain fluid is a fail..

To get it through, gaffer tape will do.
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crazymotorbik...
Nearly there...



Joined: 05 Mar 2006
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PostPosted: 23:31 - 27 Sep 2012    Post subject: Reply with quote
Hi,
It doesn't cause a safety issue so fingers crossed it will pass.

Completely agree with you on fixing it but been cash strapped it will have to wait. Think i will try some Hylomar Blue.

Cheers,
Shaun R.
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DMCpro
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Joined: 16 Jul 2012
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PostPosted: 23:34 - 27 Sep 2012    Post subject: Reply with quote
##Paddy## wrote:
DMCpro wrote:
MOT is for road safety. if it causes a hazard it should fail.
leaks arent really what an mot tester is looking for though, you should really try and get it sorted, next time use a bit of gasket sealant.


You really are a gimp.

Any leaks will fail an MOT. Not being able to contain fluid is a fail..

To get it through, gaffer tape will do.


you clearly havent read my message. Like I said if it causes a hazard it should fail. ive got an mot cert with an advisory of "slight petrol leak" on it to prove that what you've just said is made up.
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VW Golf Estate
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Matt-
World Chat Champion



Joined: 19 Jul 2012
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PostPosted: 23:36 - 27 Sep 2012    Post subject: Reply with quote
Gaffer could work,

I would just put some black siloken on it Laughing
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Current Bike's - Road Legal TZR 125 Pitbike, Aprilia SR50R 2010
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P.addy
Red Rocket



Joined: 14 Feb 2008
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PostPosted: 23:40 - 27 Sep 2012    Post subject: Reply with quote
DMCpro wrote:
you clearly havent read my message. Like I said if it causes a hazard it should fail. ive got an mot cert with an advisory of "slight petrol leak" on it to prove that what you've just said is made up.


Well even my fantastically easy going MOT guy failed because the carb was dripping. A petrol leak is a fail. Petrol > hot engine > warm penis.

Feel free to scan the MOT, I'll eat a lemon Thumbs Up
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DMCpro
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Joined: 16 Jul 2012
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PostPosted: 23:50 - 27 Sep 2012    Post subject: Reply with quote
will dig it out tomorrow and scan it if you like pal.
I always tip my local garage.
I am still in training at college most technitions seem to think stupid things will pass and they do amazes me sometimes.
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VW Golf Estate
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blurredman
World Chat Champion



Joined: 18 Sep 2010
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PostPosted: 00:03 - 28 Sep 2012    Post subject: Reply with quote
DMCpro wrote:
you clearly havent read my message. Like I said if it causes a hazard it should fail. ive got an mot cert with an advisory of "slight petrol leak" on it to prove that what you've just said is made up.


I can confirm this. I have such advisories for 'Slight oil leak' sometimes. It does not cause an outright fail.
Saying that, I don't know if an MOT tester will even bother to look under the engine.
____________________
CBT: 12/06/10, Theory: 22/09/10, Module 1: 09/11/10, Module 2: 19/01/11
Past: 1991 Honda CG125BR-J, 1992 (1980) Honda XL125S, 1996 Kawasaki GPZ500S, 1979 MZ TS150.
Current: 1973 MZ ES250/2 - 18k, 1979 Suzuki TS185ER - 10k, 1981 Honda CX500B - 91k, 1987 MZ ETZ250 (295cc) - 40k, 1989 MZ ETZ251 - 51k.
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69chris
Trackday Trickster



Joined: 10 May 2011
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PostPosted: 00:07 - 28 Sep 2012    Post subject: Reply with quote
oil leak is a 'non component advisory' although there is a box to tick if you think its dangerous Smile
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crazymotorbik...
Nearly there...



Joined: 05 Mar 2006
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PostPosted: 20:16 - 29 Sep 2012    Post subject: Reply with quote
Hi,
Thanks for the replies Karma all round.

I found a rather nice 4 inch hairline crack on the underside of the RH crankcase. The crack runs between the footrest bolt holes and to the outer edge of the crankcase. Possibly caused by an off putting pressure on the footrests?

I have glued it with DP110 structural epoxy resin (Got a huge bottle from work Very Happy ) for now and it has stopped the leak however i hate bodges and would like a more permanent fix.

Does anyone know if these can be welded?

Cheers,
Shaun.
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kramdra
World Chat Champion



Joined: 28 Oct 2010
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PostPosted: 22:50 - 29 Sep 2012    Post subject: Reply with quote
If it was the cover then easy, but crank case you will have to strip it first Sad

got a picture?
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crazymotorbik...
Nearly there...



Joined: 05 Mar 2006
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PostPosted: 23:21 - 29 Sep 2012    Post subject: Reply with quote
Hi,
Unfortunately i have no picture. It looks like there are a few other small cracks in the crankcase also Sad

I'm incredibly skint so buying a second hand case is not possible at the moment. I cant even afford to strip it down as i'll need a gasket set etc. Was hoping it could be done in situ then i'd only need a new clutch gasket. Also have the added bonus of my old man been a welder Smile

The glue seems to have done the trick but seems less than permanant as fixes go.

I need the bike to start saving money on fuel but have no money to repair it. Talk about a catch 22!

Cheers,
Shaun.
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DMCpro
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Joined: 16 Jul 2012
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PostPosted: 00:30 - 30 Sep 2012    Post subject: Reply with quote
crazymotorbiker wrote:
Hi,
Unfortunately i have no picture. It looks like there are a few other small cracks in the crankcase also Sad

I'm incredibly skint so buying a second hand case is not possible at the moment. I cant even afford to strip it down as i'll need a gasket set etc. Was hoping it could be done in situ then i'd only need a new clutch gasket. Also have the added bonus of my old man been a welder Smile

The glue seems to have done the trick but seems less than permanant as fixes go.

I need the bike to start saving money on fuel but have no money to repair it. Talk about a catch 22!

Cheers,
Shaun.


If your very careful you won't need to replace clutch gasket. I done my clutch earlier and didn't have a gasket, I used silicone sealant. Not the best fix but it will do!
I wouldn't say you Would need to strip it out if your dads a welder, does he have a tig welder? Tig welders are the easiest to weld aluminium with.

I know how you feel about the cg, mine was a little bit of a money pit when I first got it but now it's had work done to it it won't need anything for a long while as long as I keep on top of the oil changes air filter clean etc
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