Just thought I would share. I was cleaning the 888 for a couple of events on Friday night and after wiping away some of the grease from the chain, I was greeted with the notorious crack near the pivot point. I have always followed the factory torque settings and feel confident that I have not overtightened, but this has happened. So this weekend became a strip down, rather than a ride out. This is a regular failing with the 750ss, 900ss, 851s, 888s and also appears on some Monsters. Keep your eyes open fir these sort of cracks: They can be repaired by a good engineer/welder For some reason they seem to appear more frequently on the chain side (not impossible on the other side) They dont get better by themselves, so keep an eye open.
That's a bugger, I've heard of this but not actually seen it. Are you going down the welding route? Or replacement? It's a long story but I've ended up with these 3. I believe: 2 x M900(marked 1 & 2) And 1 x 851(marked 3) Perhaps you can confirm from the images? I can't remember quite how cosmetically challenged the 851 one is, but could dig it out for some better images if you'd like to consider it at a reasonable price.
Presume you will be getting that repaired?. If so, would be great if you could provide details of the repair as it progresses. Out of interest, does the crack pass through the transition from the bolt head relief bore to the load bearing surface for the pinch bolt, and is there much of a radius in there as that looks like an ideal spot for a stress raiser.
Ah yes, should have remembered that the Monster frame originally came from at the Superbike, so probably an '851/888' replacement swing arm is easier to source than an alloy 900ss one, simply due to production numbers, depending on if and when Ducati introduced any design changes (or cost savings) into later Monster swinging arms. Not sure how you would repair the original cracked item, presumably have a new 'solid end' machined up and welded on as opening the existing crack up and rewelding and then machining looks like a challenge. So if there is a pre-existing repair technique would be interesting to know what it is.
There are subtle differences. Have a look at the Hugger mounting points on #3 in my image compared to #1&2. I'd imagine that has to be the way to go
Funny you should mentioned his name as i bumped into him at a East Grinstead petrol station yesterday, He know's his onions so i don't see a problem, GLW with the repair and thanks for sharing.
I'm interested to see how they approach a potential repair here, the crack has propagated most of the way through the part by the looks of it, there's going to need to be a serious amount of material removed to get rid of it then a very difficult filling job, followed by machining of the swingarm pivot bore and NDE on completion. I'd expect it will be easier, much safer and less time consuming to cut the failed part off completely, either have a new part milled or cut a good one off a donor swingarm and then jig it up and weld it on.
yeah that would be the way I'd do it, but either is better than trying to weld the original back together
With the inclement weather, I had the opportunity to peruse some IPC's for a few mins. Stein Dinse 94 900 Monster and post 93 888 both show swinging arm P/N 37010022B, and a search for this P/N brings up a Ducati parts website that shows the following applications for that P/N. It's the internet so not sure how accurate this is, had a few wobbles with Stein Dinse on line P/Nos before, but with checking with a more reliable source (dealer, or Ducati direct) may be worthwhile if you are considering sourcing a replacement, albeit the same build quality.
Quick Update - Dropped the Swing Arm to Guy Pearson at Exactweld yesterday. Immediate feedback was that it was due to over tightening and as far as he is concerned these need no more than 5 ft lb of torque to be able to pinch the pivot pin and as others said, it doesn't have to be that tight. I have asked Guy if he is good to take a few photos of his work as he goes for me to share with the group.
As @Nasher showed in his photos, the only significant difference is the tabs to bolt the rear fender to vs the screw down into the swing arm for the 2 monster ones. Certainly an option to go with a Monster one as the dimensions are the same.
The tabs for the hugger that is where you can see the difference. The 888 has them,a monster swingarm not. Henk!!!
Maybe but if you fit the appropriate hugger then it works either way. My M900 has a braced swingarm that I believe came from an 851/888? It had the tabs for the hugger but as I had just bought a new CF hugger to fit to threaded holes, I cut them off and fitted the thread inserts to suit it. Before; After; Fitted;
