1275

Post by **moggyminor16** » Fri Feb 27, 2009 10:33 pm

i have a 1275 and it sprong a leek from the clutch houseing
takern the lump out
oil pump gaskit renewed still little leak
but on the crank its leaking as well from the oil thorwer
i have now takern the sump off and takern the bottom part of the thrower off but can not see what is making it leak i have notices there is no o ring at teh back end this normal ,can any one eles help on this
chris

Post by **ssnjimb** » Fri Feb 27, 2009 10:52 pm

Hi

Is the oil leak coming from the crankshaft scroll oil seal this can be converted to a proper modern type oil seal which is more effective.

Have you replaced the oil pump ? how old is it maybe worthwhile putting a new one on if its worn or as old as the engine could it be warped.

Hope my ideas helped.

James

Post by **alanworland** » Fri Feb 27, 2009 10:59 pm

Check breather system is ok - excess crankcase pressure will blow oil out.

Post by **moggyminor16** » Fri Feb 27, 2009 11:04 pm

Is the oil leak coming from the crankshaft scroll oil seal
please help me out dont know what this is
when i took the thing off its metal and in 2 halfs bothe metal and with a cut out like a trap around it look at pic please
oil pump is working fine just needs ajustimng by my error
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Post by **moggyminor16** » Fri Feb 27, 2009 11:06 pm

the oil peed out the stripped the engine to sort it and now ill i did was stand the engien on its back to see if the oil would leak out and yes it did <br>

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Post by **bmcecosse** » Sat Feb 28, 2009 11:18 am

Of course it does- it's a labyrinth seal and only works when the crank is spinning. Oil comes out here if the engine crankcase has any internal pressure - you need to MAKE SURE one of the breathers is connected to the carb inlet to ensure the engine eats it's own fumes. However - if the engine is badly worn and much fume is escaping past the rings - there is obviously a limit to what it can cope with! Heavy over haul required! The leaking will have absolutely nothing to do with the oil pump - the idea that it could be 'warped' is certainly novel!

Post by **ssnjimb** » Sat Feb 28, 2009 11:20 am

Thankyou ecosse.

James

Post by **moggyminor16** » Sat Feb 28, 2009 6:23 pm

look like done it cleand all updde alittle smear of blue i the book says then changed the rocker cover put one on with a breather as well so now has 2 straight to the pancake
so been for a run to linford hall in munford fault i may still find the classic there but already gone
but thanks for the help
i just have never seen any thing like this before
and i am not willing to pay £70 plus for a convertion kit she can stay the way it was for years untill i get a bigger engine
cheers all chris

Post by **bmcecosse** » Sat Feb 28, 2009 6:25 pm

The conversion kit seals are not all that great. Rocker cover breather IS the best way forward - well done.

Post by **moggyminor16** » Sat Feb 28, 2009 11:19 pm

cheers mate would like to know what car from as the filter in same place as the mog one crank has a breather on it
dont seem to have a lot of pock i think i have had 85 that was pushing i have a standard carb still at the moemet
any help would be grate

Post by **bmcecosse** » Sun Mar 01, 2009 11:58 am

You should have a breather coming from the timing case cover - and now you have added one from the rocker cover. If your carb has a brss inlet at the side - connect one of the breathers - probably the rocker cover breather - to that inlet so the engine breathes in all it's own fume.

Post by **Longdog** » Mon Mar 02, 2009 7:54 am

I agree with BMC the crank seals are trying to keep oil back on a rather rough finished surface.Unless the flywheel boss is machined as well I think they are at best a waste of time.These problems are nearly always caused by crankcase pressure not the ability of the scroll.

Post by **bmcecosse** » Mon Mar 02, 2009 9:25 am

Unless the main bearings are badly worn - then the floods of oil are just impossible for the scroll to cope with!