Hi all,
Following Steptoe’s advice, the next major job I need to tackle in my restoration is replacing the rear input shaft seal on my 1150GS. I was hoping to get it done in the next week, before I’m laid up for a couple of months due to impending shoulder surgery.
There’s surprisingly little information on the internet about this, and I can’t find a single video showing the job being done without stripping the gearbox.
I’ve been assured it can be taken out in-situ, and the BMW manual simply says ‘lever out with a screwdriver’. The Clymer manual seems to only show it being replaced by stripping the gearbox and driving it inwards.
I’ve read a couple of threads on this parish - this one seems to be the best:
I can’t work out if I should be trying to get something down the outside or the inside edge of the seal. I don’t want to damage the pushrod tunnel face or the inner face of the recess it sits in. I also can’t work out just what tools to use. I have some cheap ‘dentist’ picks, but they’re probably not the right tools.
There’s some references out there to either putting a self-tapping screw in and pulling against this - this resulted in the seal being shredded in that thread above! I’ve also read about a specialist self-tapping slide hammer device, but the one shared on the post was extremely expensive, and I have no idea if it wouldn’t have the same effect as the self tapping screw method.
I do have a slide hammer (as part of a bearing-puller kit) which I did consider fashioning some sort of adapter for, but again, I don’t want to put anything down the side which might scratch the mating faces.
There are seal levers like this which may be adaptable:
I know the pivot bar won’t work in this context due to the depth of the tunnel, but I wondered if I could use the rest of the tool somehow.
It needs to be said that the gearbox is still attached to the engine, not face down on the bench, and the bike is stripped down completely to just the engine, transmission, swing arm and rear wheel.
Can anyone please give me some clear advice on how to remove it properly, or point me towards a how-to? Pictures of tools you’ve used, techniques or the job being done would be really helpful…video would be amazing!
Appreciated as always!
Mike
Following Steptoe’s advice, the next major job I need to tackle in my restoration is replacing the rear input shaft seal on my 1150GS. I was hoping to get it done in the next week, before I’m laid up for a couple of months due to impending shoulder surgery.
There’s surprisingly little information on the internet about this, and I can’t find a single video showing the job being done without stripping the gearbox.
I’ve been assured it can be taken out in-situ, and the BMW manual simply says ‘lever out with a screwdriver’. The Clymer manual seems to only show it being replaced by stripping the gearbox and driving it inwards.
I’ve read a couple of threads on this parish - this one seems to be the best:
I can’t work out if I should be trying to get something down the outside or the inside edge of the seal. I don’t want to damage the pushrod tunnel face or the inner face of the recess it sits in. I also can’t work out just what tools to use. I have some cheap ‘dentist’ picks, but they’re probably not the right tools.
There’s some references out there to either putting a self-tapping screw in and pulling against this - this resulted in the seal being shredded in that thread above! I’ve also read about a specialist self-tapping slide hammer device, but the one shared on the post was extremely expensive, and I have no idea if it wouldn’t have the same effect as the self tapping screw method.
I do have a slide hammer (as part of a bearing-puller kit) which I did consider fashioning some sort of adapter for, but again, I don’t want to put anything down the side which might scratch the mating faces.
There are seal levers like this which may be adaptable:
I know the pivot bar won’t work in this context due to the depth of the tunnel, but I wondered if I could use the rest of the tool somehow.
It needs to be said that the gearbox is still attached to the engine, not face down on the bench, and the bike is stripped down completely to just the engine, transmission, swing arm and rear wheel.
Can anyone please give me some clear advice on how to remove it properly, or point me towards a how-to? Pictures of tools you’ve used, techniques or the job being done would be really helpful…video would be amazing!
Appreciated as always!
Mike
