Jubilee tappets

If you mean the followers and bushes, I have, and it wasnt as easy as I hoped! Its easy to damage the bushes as you put them in ( I heated the barrels and froze the bushes) If you mean the rockers - no I havent but that should be easy enough.

Its usally the followers that wear, I fitted bushes because I was using a new barrel. They'll be quiet for about 10 mins then rattle again!

Hi Jim,

You've had some good advice from Patrick. I'd just like to add:-

When you drift the new tappet bushes into the barrel do it from the underside. There is to stop shoulder, so do notdrift the bushes in too far. If you go too far, you can drift them bach from the top of the barrel.

You have to drift the bushes in far enough for the tappets to ride the cam without the generous radius on the follower jamming in the bore of the tappet bush. The further in you drift the bushes the faster the follower will wear, as the usupported length of follower shaft gets longer. Check by dropping thebarrels onto the crankcases without a cylinder base gasket and rotate the camshafts. All should move freely without the barrels trying to lift.

Alwaysalign the two drainage slots with the direction of the camshaft. You may find your original bushes were not so aligned. This gives thebest bearing surface fore and aft. The same direction as the forces between tappet and cam.

Patrick recommended heating the cylinder and freezing the bush. It might help assembly slightly, but since both items are cast iron, of different types, you will get very little benefit on assembly, and none on disassembly. Had the cylinders been of aluminium or brass, heat would greatly reduce the iterference fit.

I would recommend you drift the bushes in or out with the components at ambient temperature. It saves trouble in the kitchen and might save any cylinder paint.

Yes, I've replaced them.

Good luck

Peter

Previously james_mcneice wrote:

Has anybody replaced the tappets and there bushes

Thanks. Jim

Previously peter_holland1 wrote:

Hi Jim,

You've had some good advice from Patrick. I'd just like to add:-

When you drift the new tappet bushes into the barrel do it from the underside. There is to stop shoulder, so do notdrift the bushes in too far. If you go too far, you can drift them bach from the top of the barrel.

You have to drift the bushes in far enough for the tappets to ride the cam without the generous radius on the follower jamming in the bore of the tappet bush. The further in you drift the bushes the faster the follower will wear, as the usupported length of follower shaft gets longer. Check by dropping thebarrels onto the crankcases without a cylinder base gasket and rotate the camshafts. All should move freely without the barrels trying to lift.

Alwaysalign the two drainage slots with the direction of the camshaft. You may find your original bushes were not so aligned. This gives thebest bearing surface fore and aft. The same direction as the forces between tappet and cam.

Patrick recommended heating the cylinder and freezing the bush. It might help assembly slightly, but since both items are cast iron, of different types, you will get very little benefit on assembly, and none on disassembly. Had the cylinders been of aluminium or brass, heat would greatly reduce the iterference fit.

I would recommend you drift the bushes in or out with the components at ambient temperature. It saves trouble in the kitchen and might save any cylinder paint.

Yes, I've replaced them.

Good luck

Peter

Previously james_mcneice wrote:

Has anybody replaced the tappets and there bushes

Thanks. Jim

Hello Peter, after reading your comments I have just checked my new barrels that I am ready to fit on my jubilee engine, the slots on the bushes on mine point side to side when looking at the barrel from length ways, this was how they were when stripped, might I now have some issues?

Cherrs Kelvin.

I thought it was me not Patrick! But in any event there is no way that my bushes would have fitted if I hadnt heated the barrel in the oven. If they are lose enough to tap in cold i'd use some bearing retaining fluid to make sure they didnt fall out. But then I worry about stuff!

Dan

Previously Dan Field wrote:

I thought it was me not Patrick! But in any event there is no way that my bushes would have fitted if I hadnt heated the barrel in the oven. If they are lose enough to tap in cold i'd use some bearing retaining fluid to make sure they didnt fall out. But then I worry about stuff!

I'd add that on my old barrels when I heated them the bushes fell out, so the heat def makes a difference.

Dan