Trashed Jubilee clutch oil seal.

I’m not sure which is which, but the early and late engines have different seals, I’ve fitted both but bought two of each, because like the crank seals they are a pain to fit! I’ll have a look at an early inner chain case tomorrow and see if the retainer protrudes.

dan 

Hi John, I assume we are talking 1961-ish? (Early gearbox?)

22474 is the right part number - and it also does service as ES2 drive side oil seal, which I'm not familiar with.

Behind the Navi/Jub clutch, the correct oil seal is only half width, and sits down on a plate riveted at the rear. To use the currently supplied oil seal (which I'm guessing is 'normal' width, you may need to dispense with the riveted plate - remember to block the holes!!

On my next order from NOC Spares, I will get one of these oil seals & try it for myself to give a definitive answer. Sorry I'm not up to speed on this!

John apologies, having looked in my pile of spares I can see that it was the drive side crank seal that was a pain in the bottom. The chaincase seal fitted in ok. Here’s a couple of pics of one of my chain cases. A dremmel shouldn’t be necessary the seal buts up against the riveted plate.

The seal is just a normal seal , no chamfer, bit it is only about 3 mm thick.   

If it helps the number on the seal is RTB 3371. 53.  I’m guessing 25x40x3, 25x40x5 seems readily available but it will protrude by 0.5mm it’s worth checking whether it matters if it protrudes a bit, if there is clearance with the back of the clutch I wouldn’t worry about it.  dan 

Hi John,

I can thoroughly recommend the purchase of a digital measuring calliper. They have come down in cost remarkably and even come up at ALDI now and again.

With the depth gauge you will be able to measure how deep the seal housing is. You will be able to measure the depth and diameter of the old seal. And then the new replacements before you fit them. All to a hundredth of a millimetre or a thousandth of an inch.

You will know if the seal is going to stick out before you press it in. And you will know if it is fully pressed in.

I really cannot recommend one highly enough.

Peter

Peter

I agree, thats what I did, the problem is the recess for the seal is less than 5mm the width of the seal (readily available from simply bearings). But it may not matter if it doesn’t rub on the back of the clutch. That’s what I would check first.  dan