I am trying to remove the primary cover on my 52 B33. It has the pressed or stamped tin work so I dont want to shock it too hard with the rubber mallet. My guess is someone has unfortunatly coated both sides of the gasket with the sealer, this is a shame and has me a bit stumped as to how to get the cover off with out damaging it.
I have not hot out the heat gun yet just,so far I have just tried the mallet treatment. Question please,will the heat gun peel my paint or are there any other ideas out there for removing this cover?......thanks wayne
If silicone sealant has been used then it will be pretty resistant to heat treatment and the paint will suffer first.
The front section of the cover is quite study and you can apply a fair amount of pressure to attempt to lever it off using a tyre lever and block of wood as fulcrum. Slow constant pressure is better than shocks with a mallet ;D
Thanks Pete, good point on prying from the front part of the cover. Photo shows what worked real well for me. Yes it looks like silicone on both sides of the gasket, someone must have been tired of this primary cover leaking I guess :).
Now that the cover is off I want to look at my clutch as it has been slipping. I have a couple of questions please as my manual is not really helping with some things I am not sure about........
1. I want to get the Clutch Center off but not real sure if the Mainshaft nut is a left or right hand thread? Pretty sure its a left hand but want to double check before putting an impact gun on it.
2. Second question is the "Clutch Center" has one of its 6 threaded rods come loose from its tack weld shown on the inside of the center in the photo. Not sure if these spot welds are from the factory or a handy man solution. I have a welder but I dont want to add too much heat to this area to re spot weld incase I warp things. Maybe the spot welds are just to kind of hold the bolts in for installing springs etc and dont really need strength at the welds but until I get the Clutch Center off I have no idea how the bolts or threaded rods are held in place. This threaded rod will wiggle but not spin so maybe its OK as is?
3. Just curious on this one, I have seen people use brake clean on the clutch plates an friction plates but if all the primary oil is flying around in the primary during operation Im curious as to why it would matter if the clutch plates are oily before installing.
.........thanks in advance for any help on this.......wayne
The nut on the mainshaft is a normal right hand thread.
By the way, I noticed in the photo that the spring clip on your primary chain is pointing the wrong way.
Just put aweld on the back of the stud, I have done many with no problems.
Thanks Rog1 regarding threads on main shaft and also point taken on the spring clip for Primary chain, I did notice that also. I will pull the center clutch off now that I have right hand threads confirmed for main shaft and I will look over things more closely. I plan to have the gear box looked over sometime during the winter so Iam guessing I will need to pull the clutch center off anyways to get the gear box off the bike. The rainy weather is just about here in BC Canada so I may not put new clutch plates and primary cover back together untill the gearbox is taken apart and rebuilt.
Also thanks Idie regarding the back side weld for threaded rods. I will look it all over when I get things further apart.......wayne
I was watching a video online that shows clutch removal for a complete tear down. It showed first a puller used on the clutch center then a second pull of the clutch chain ring after that. It seems like the puller needed for the clutch center if pulled first would need to have very thin tabs for pulling which I dont have. My question please is... can I pull the clutch chain ring and the clutch center both off at the same time by putting my puller straight onto the chain ring? My puller will fit for this but not sure if this will work because in Brain Alfonso's restoratin video he did it with two pulls so thinking their must be a reason he did it this way? ....thanks wayne
Hi Wayne
in my experience once you have undone and removed the clutch centre nut the chain wheel pulls off the bearing with very little force, just by hand. leaving the clutch hub to be pulled off the key way with the clutch centre tool.
I am having a hell of a job removing the clutch centre on my B31. I have bought the puller from 2 sources and they are both too small a diameter to fit the thread. only by a very small amount but the puller will not screw onto the clutch centre. Can anyone give me any reason why this should be the case. I am bald but if I had hair I would have pulled it out over this problem
Hi "750Ridreuck" not sure if this will help you but on this video https://www.youtube.com/watch?v=nW-ccGOmsJo&t=955s right around the 1:40 mark you can see Brain Alfonso removing the clutch centre with a puller that pulls the clutch center from its out side edges instead of the BSA tool for the job. It would have to be a puller with a very low profile tabs to get between the clutch center and the clutch chain wheel but he has done so. Then he used a second pull to pull of the clutch chain wheel. Watch the video and see what you think. .........wayne
Thanks for that. It is actually the clutch centre which is held on a taper and woodruff key. In the video it magically removes.... I wish mine would do that. Looks like I am going to have to weld something to the centre and pull it off with a different puller and buy a new centre. Seem to be unobtainable at the moment unless any of you fine crew have a spare lying around
Quote from: 750rideruk on 20 Sep, 2021, 20:28
I am having a hell of a job removing the clutch centre on my B31. I have bought the puller from 2 sources and they are both too small a diameter to fit the thread. only by a very small amount but the puller will not screw onto the clutch centre. Can anyone give me any reason why this should be the case. I am bald but if I had hair I would have pulled it out over this problem
If you measure the outside diameter of the clutch centre and the inside diameter of the puller and report back here, I will do the same and we can compare results. My puller certainly fits on my own clutch centre, as I used it recently; I bought it from Draganfly in August. I presume it's the 6 spring clutch you have.
HI Rog1 and 750 rideruk. PHoto shows where I am at presently. Pulled off the clutch center by pulling on the Clutch chain wheel with a reg outside puller. So part of the center clutch is off complete with its outer bearing race which appears to be pressed into the clutch chain ring. The inermost part of the clutch center containing its inside bearing race and bearings still need to be pulled off of the mainshaft. Photo shows with lines drawn in red to denote the measurement I have taken on the outside diameter of the threads that I guess the proper BSA clutch puller tool would fit to. The OD is 1.181" or 30mm. HOpe this helps, I have a puller on order so I will wait to see if it fits......wayne
Quote from: WayneBergman on 22 Sep, 2021, 00:58
HI Rog1 and 750 rideruk. PHoto shows where I am at presently. Pulled off the clutch center by pulling on the Clutch chain wheel with a reg outside puller. So part of the center clutch is off complete with its outer bearing race which appears to be pressed into the clutch chain ring. The inermost part of the clutch center containing its inside bearing race and bearings still need to be pulled off of the mainshaft. Photo shows with lines drawn in red to denote the measurement I have taken on the outside diameter of the threads that I guess the proper BSA clutch puller tool would fit to. The OD is 1.181" or 30mm. HOpe this helps, I have a puller on order so I will wait to see if it fits......wayne
Thank you, WayneBergman.
I have two clutch centres here. The first one seems to be an original BSA part, and the OD of the thread is 1.181" or 30mm. The second one seems to be a later pattern part and I measured 1.177" or 29.9mm for the OD. My puller measured 28.9mm or 1.138" for the ID of the thread. The second one was on the bike and I've just realised the puller doesn't go on very far, though it does go on far enough that all the thread on the clutch centre is engaged. I had a closer look at both threads. The one on the clutch centre has two or three minor dings, while the one on the puller isn't the best machined thread I've ever seen.
The thread on the original BSA centre is rather battered and I can't get the puller on even half a turn, but another puller owned by somebody else goes right on. I measured the thread on the pattern clutch centre as 20 tpi, but the original BSA centre's thread is in such poor condition I couldn't measure it.
750rideruk, if your clutch centre and pullers measure the same as above or very close to those figures, it might be that your clutch centre's thread has a dent in it, or perhaps a bit of dirt or even some thread locking compound; it doesn't take much to stop another thread engaging. Check the pullers for these issues too.
Rog1
Would you consider selling me one of your clutch centres. They seem to be harder to find than rocking horse s**t at the moment.
T.I.A
Quote from: 750rideruk on 23 Sep, 2021, 16:08
Rog1
Would you consider selling me one of your clutch centres. They seem to be harder to find than rocking horse s**t at the moment.
T.I.A
The one I'm putting on the bike isn't the right one and I had it machined just this morning to make it work, the issue being the splines were not long enough to hold the lock washer. The other one is completely and utterly knackered and too far gone to do anything with. It was also machined in a practise run for doing the other one. I wish I could help.
(Added)
The knackered one doesn't fit on my mainshaft; it comes up against a shoulder (I think) before the tapers even meet. I was given it (Yep, it's really that bad) so I don't know much about it.
750rideruk,
I forgot to ask. What is the problem with your old one?
Below is the knackered one. The photo is quite flattering; it's far worse in real life! :D
Roger
Quote from: 750rideruk on 23 Sep, 2021, 16:08
Rog1
Would you consider selling me one of your clutch centres. They seem to be harder to find than rocking horse s**t at the moment.
T.I.A
750rideruk
I may have a solution for you. This is a thread I started some time ago, and I've just posted my conclusions:
https://www.bsaownersclub.co.uk/bsaoc_forum/index.php?topic=12461.0 (https://www.bsaownersclub.co.uk/bsaoc_forum/index.php?topic=12461.0)