Forced restoration of 900SS after finding crack in frame. - Page 2 - Ducati.ms - The Ultimate Ducati Forum
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post #11 of 462 (permalink) Old Mar 20th, 2015, 2:56 pm Thread Starter
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Have had a chance to look at some of the other bits and pieces that I have removed from the bike. The outer tubes for the forks are absolutely shot. There are massive areas of corrosion under the anodising that is eating literally into the aluminium. I was going to repair them as I found that the area that alerted me to the fact that something was not right with them turned out to be not as bad as I first thought, but no. Further done the fork leg there was an area 5 times the size that was twice as bad. I had planned to get the forks rebuilt and now it will be a case of replacing both outer fork legs. Toying with the idea of getting the new ones re-anodised a darker shade of gold before sending them away to be rebuilt. Also looking at the prospect of getting a set of titanium nitride coated lower fork tubes as well. Looking at the rest of the bike bits latter today.
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post #12 of 462 (permalink) Old Mar 21st, 2015, 2:37 pm Thread Starter
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Got impatient and decided to take the "Tim the tool man Taylor" approach today to get the frame all sorted with the grinder - what could possibly go wrong. As I started to grind the welds more steam and water came out. I have drilled a tiny hole and hung the frame up to let the water drain out but will get the heat gun on the frame and heat the tubes up to drive the water out as well. Concentrated on the actual welds from either side of the tube and got it down to a point where there was a line that formed between the old bracket and the weld. Once this formed it was simply a case of carefully breaking the weld from one side and twisting it off. Then a simple clean up of the remaining weld and presto all done. It was a bit more complicated to remove the remnants of the frame tubes from the out board part of the frame which was nothing more than an access issue. got here in the end though.
After a quick look at the frame again there are the start of a couple of other cracks while I was working away but nothing that can't be fixed tomorrow.
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Last edited by Combi245; Mar 21st, 2015 at 2:51 pm.
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post #13 of 462 (permalink) Old Mar 22nd, 2015, 9:52 pm
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frame metal!

Hi you are doing what i have been putting of for a while now.
will post pic's in the next day or so.
My question is what is the frame material iron,moly,soft steel etc or
Italian cardboard.
As i want to get it welded locally it's a 4 hour trip to the frame welder.
I have a friend whom i can rely on.
I'll have to rig up a jig so it's all square and straight.
Cheers
Luckily i have another ride to keep me rolling on.
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post #14 of 462 (permalink) Old Mar 22nd, 2015, 10:16 pm
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Quote:
Originally Posted by black prince View Post
My question is what is the frame material iron,moly,soft steel etc or
According to the Ducati Workshop Manual (page A.9):

"The frame is a tubular type with Chrome-Molybdenum steel trestle."

This is confirmed in the Owner's Manual.

Mike White
1997 916, 1995 900SS CR, and 2013 BMW K1300S, 1995 BMW R1100RS, and 1988 BMW K75S
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post #15 of 462 (permalink) Old Mar 22nd, 2015, 11:59 pm Thread Starter
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After a bit of testing we have been able to work out that it is definitely Chrome moly steel that the frame is made from.
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post #16 of 462 (permalink) Old Mar 23rd, 2015, 12:44 am
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Forced restoration of 900SS after finding crack in frame.

What kind of tests did you do?
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post #17 of 462 (permalink) Old Mar 23rd, 2015, 4:51 am Thread Starter
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We used a deflection test first up was the give away- the amount of force that was required to bend the tubes that I removed from the bike against a known tube of the same diameter and wall thickness in both cromolly and mild steel. The two Cromolly tubes bent at the same amount of force applied to them where the mild steel one took a lot less. It was very noticeable how much the tube actually sprang back after bending. The spark test was inconclusive. We also looked at the way the tubes were actually made. The tubes off the bike were totally seamless.
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post #18 of 462 (permalink) Old Mar 23rd, 2015, 8:18 am
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Forced restoration of 900SS after finding crack in frame.

Interesting. As far as I know CroMo is not usually MIG welded. Yield strengths of carbon steels overlap with that of chromo so I would think that deflection testing alone would not confirm if the tubing is indeed 4130 or some kind of non-alloy steel.
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post #19 of 462 (permalink) Old Mar 23rd, 2015, 10:17 am
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I'm loving so many detailed pictures. Haven't seen as much detail on a frame repair before, super helpful, thanks!

BTW, isn't density of 4130 chromoly different than other steel alloys? Wouldn't the weight of a same size and wall thickness tube of mild steel to compared to the frame give a clue also? Although I can't really think why the workshop manual and the owners manual would both say Chromoly steel if it isn't. Nevertheless, i hear both from lots of different forums and sources.

1994 900SS
Project Suziki JR50: get my boys started

Last edited by Drdds; Mar 23rd, 2015 at 10:19 am. Reason: additional comment
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post #20 of 462 (permalink) Old Mar 23rd, 2015, 1:19 pm
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Great pics, mine was repaired too but the welding as as great.
i used the Nichols kit, 2 years later and no issue....

i don't know why but i do not like showing the chassis or reg number of my bike on the internet...

1995 900SS
2007 BMW GS1200 (daily commute...)
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