Skip to main content
000000 000001 000002 000003 000004 000005 000006 000007 000008 000009 000010 000011 000012 000013 000014 000015 000016 000017 000018 000019 000020 000021 000022 000023 000024 000025 000026 000027 000028 000029 000030 000031 000032 000033 000034 000035 000036 000037 000038 000039 000040 000041 000042 000043 000044 000045 000046 000047 000048 000049 000050 000051 000052 000053 000054 000055 000056 000057 000058 000059 000060 000061 000062 000063 000064 000065 000066 000067 000068 000069 000070 000071 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 000883 1.slide1 2.slide2 3.slide3 4.slide4 5.slide5
English French German Italian Spanish

ES2 Oily Top End

Forums

Hi all,

On my newly commissioned oily rag '55 ES2, just on warm up in the workshop I'm seeing a lot of oil at the top end around the plug and fins in that area. When putting it together I did not see any gaskets between the rockerbox and the head and its that joint that I suspect the oil is coming from. When I put it together after the re-bore and new piston I lapped both the top of the head and the bottom surface of the rockerbox, using flat plate glass and grinding paste, plus the use of a jointing compound.

So, am I correct - no gasket and what's the best method of sealing the joint - or is it a case of they are all like that sir?

Thanks - Paul.

Permalink

It cant be right as it is. (Can it?) Otherwise easy2's and model 50's would not have a good reputation. 

May I suggest a wash down with brake cleaner and dusting the area with talc?

This way you will see exactly where it is leaking from.

Regards, George. 

Permalink

... that there's no gasket (at least there isn't on my 1952 ES2). What sort of jointing compound do you use? I swear by wellseal - a thin brushed coat then left to go tacky for 15 minutes or so (longer in current temperatures). Mine doesn't leak from there at all.

You may find as George suggests that it's coming from elsewhere - what about the rocker feed banjo? I use a Dowty washer there.

Permalink

Ian, George,

Thanks for those suggestions - I'll try again with Wellseal.

I've already re-done the rocker feed banjo and the dome nuts on the rocker shafts with plumbers tape.

Regards - Paul.

Permalink

... the tape (ptfe?) will necessarily stop leaks. You need proper washers. As I mentioned I use Dowty washers either side of the banjo and under the dome nuts. If you object to them (I know some do) then good fibre washers will do although if I use them I often give them a quick coat of Wellseal as well.

Permalink

Take care when tightening the rocker feed banjo, the thread  strips easily. I use alloy washers with a thin coating of Hylomar, but Wellseal is similar. I ended up making gaskets for my rocker box as there always seemed to be a slight weep there. 

Permalink

Thanks again for the tips.

My first run out on it today, last on the road in 1978.

Got a rear puncture 2 miles from home and had to push it off the dual carriage way for 1/2 mile - got my exercise today!

Fixed the puncture when I got home, take the rockerbox of tomorrow to fix the leaks. 

Thanks - Paul.

Permalink

you say you rebuilt after a rebore so you had a new gasket at the cylider base, is it possible that you didn't get it the right way round? If the drain holes are blocked by a wrongly fitted gasket there will be a build up of oil in the rocker box. Also, I have several o.h.v.Nortons, and I have always fitted a gasket between the head and rocker box.

Permalink

hi Andrew, the base gasket has two holes in both sides to ensure you can't get it wrong (one hole is redundant). As above guidance the ES2 has no gasket between the head and rockerbox. 

I'll let you know on progress.

Thanks Paul.

Permalink

Hi Paul,

   You are right to grind the joint faces flat, but it is best to use gaskets and sealer as the wall width is quite narrow. If you have some fine scissors and some hole punches they are not too difficult to make, but remember to use a washer of the same material on the single bolt near the top of the pushrod tubes just to keep everything level. The rockerbox feed banjo originally had a copper washer either side to seal each face.

   One reason that could be causing the oil leak is the feed pipe/banjo soldered joint may be fractured due to vibration. The length of this rigid pipe causes leverage on the joint and for reliability it is best to cut a small gap a couple of inches from the banjo and use a suitable rubber pipe to join the two ends together.

  

Permalink

Richard - thanks for the further info. I had the issue you describe at the other end of the pipe on the oil tank and re-soldered the joint. I'd already replaced the pipe with flexible hose.

Regards - Paul.

Permalink

The joints between the cylinder head and the rocker box does require gaskets. A top end gasket set will come with the gasket(s) you require.

Permalink

Thanks Albert - I have bought a set from the club and fitted them - much better now.

Regards - Paul.

Permalink

I remember reading somewhere here that it is best to anneal the oil feed banjo washers each time you remove them.

I did that the last time I had them off and have not had any leak issues since.

Mike

 

Norton Owners Club Website by White-Hot Design

Privacy Policy