Skip to main content
000000 000003 000006 000009 000012 000015 000018 000021 000024 000027 000030 000033 000036 000039 000042 000045 000048 000051 000054 000057 000060 000063 000066 000069 000072 000075 000078 000081 000084 000087 000090 000093 000096 000099 000102 000105 000108 000111 000114 000117 000120 000123 000126 000129 000132 000135 000138 000141 000144 000147 000150 000153 000156 000159 000162 000165 000168 000171 000174 000177 000180 000183 000186 000189 000192 000195 000198 000201 000204 000207 000210 000213 000216 000219 000222 000225 000228 000231 000234 000237 000240 000243 000246 000249 000252 000255 000258 000261 000264 000267 000270 000273 000276 000279 000282 000285 000288 000291 000294 000297 000300 000303 000306 000309 000312 000318 000321 000324 000327 000330 000333 000336 000339 000342 000345 000348 000351 000354 000357 000360 000363 000366 000369 000372 000375 000378 000381 000384 000387 000390 000393 000396 000399 000402 000405 000408 000411 000414 000417 000420 000423 000426 000429 000432 000435 000438 000441 000444 000447 000450 000453 000456 000459 000462 000465 000468 000471 000474 000477 000480 000483 000486 000489 000492 000495 000498 000501 000504 000507 000510 000513 000516 000519 000522 000525 000528 000531 000534 000537 000540 000543 000546 000549 000552 000555 000558 000561 000564 000567 000570 000573 000576 000579 000582 000585 000588 000591 000594 000597 000600 000603 000606 000609 000612 000615 000618 000621 000624 000627 000630 000633 000636 000639 000642 000645 000648 000651 000654 000657 000660 000663 000666 000669 000672 000675 000678 000681 000684 000687 000690 000693 000696 000699 000702 000705 000708 000711 000714 000717 000720 000723 000726 000729 000732 000735 000738 000741 000744 000747 000750 000753 000756 000759 000762 000765 000768 000771 000774 000777 000780 000783 000786 000789 000792 000795 000798 000801 000804 000807 000810 000813 000816 000819 000822 000825 000828 000831 000834 000837 000840 000843 000846 000849 000852 000855 000858 000861 000864 000867 000870 000873 000876 000879 000882
English French German Italian Spanish

ES2 Primary case leak again

Forums

Ive just fitted a new Primary case seal to my 1949 ES2, cut to size as instructed and not overtightened the outer case either, Still leaks !!! Is this a common feature to these singles that I will just have to live with ?

Permalink

Well, yes actually. I'm sure there'll be plenty of members who have their own solution to getting the primary oil tight, but if there wasn't an issue there wouldn't be so many suggestions. The question is how bad is it? If it loses all its oil on a 30 mile run, I'd say you need to keep trying to make it better. Certainly try to make certain that the band isn't getting twisted or distorted as you push the cover on, a smear of grease should help that. Alternatively, fit an expensive belt drive with a sealed release bearing that runs dry so won't EVER leak!

Permalink

You will have to be very methodical if you want to sort this problem out.  Make sure the cover edge does not come into contact with anything that will stop it fitting properly. check the faces of inner and outer are smooth and not bent ,check the seal on the gearbox shaft.Check the innercase seals against the crankcase. Use the minimum amount of oil. Buy a 500g tin of RED RUBBER grease and use it. Are you sure its not the engine breather that kicking out oil? or the gearbox.

Im sure its the chain case as I i took it all apart, cleaned it and left it for a few days. when I refitted and topped up with oil there is now a drip under it ( dripping off the inner chain case lower mounting bracket. When I put on the new seal it was super tight getting the outer chain case over the new seal ( I did lubricate it to help it slip over. I have read other people have had leaks and I guess its common. Don't really want to strip it all again if I can't cure it.

Permalink

Hi Michael,

   The bottom bracket where you say the oil is dripping off, is riveted to the inner case and this can come loose and chatter with vibration. This then enlarges the rivet holes and lets the oil leak through. To check if this might be the problem, undo the nut that secures it to the bottom gearbox bolt, you can then see if it is loose. Also it is possible that either chain can wear through the strengthening webs on the inner case, but you will have to strip all the primary side off to be sure.

 

Permalink

The bracket must not pull or push the case as it will distort it. If necessary use a packing washer to adjust the fit.A drip or two after riding is pretty normal ,it should not leak if just standing.

Hi Richard,

Ive checked the lower bracket and as you said it moves so the rivets are loose I guess .

Im guessing long term I will need to strip it out and re rivets it.

Thanks,

Mick

Permalink

Hi Mick,

   If the leak is not too bad, its not worth disturbing everything until you need to. You will know when it's time when you feel embarrassed about the mess it leaves when you are parked up in public !! Just check and top-up before any long journeys or after a couple of weeks or so.

Permalink

There is the theory that the sticker on the primary cover was misprinted by the factory and should have read “Patented Norton Oil Leak”.

 

Norton Owners Club Website by White-Hot Design

Privacy Policy