Cracked Engine case / mount - Page 3 - Ducati.ms - The Ultimate Ducati Forum
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post #21 of 51 (permalink) Old Sep 9th, 2018, 1:58 pm Thread Starter
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Originally Posted by RLB454 View Post
Winter is not too far away, and you know, the good Lord did create winter for motorcycle projects
Rushing into winter are we Looks like I have my winter project all lined up for me now! Although here in Coastal Virginia, I ride all but 2 or 3 weeks of the year. I'd almost rather ride in chilly weather over 95F and 97% humidity... pretty much the entire month of August!

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post #22 of 51 (permalink) Old Apr 16th, 2019, 11:30 am Thread Starter
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Time for an update! Been sloooowly working on stripping down the case and finally got it prepped for welding. Then the bad news: the guy who I had lined up to weld it looked at it again today and decided the damage was too great that the cost of him machining a new piece to fit in the missing chunk and all the heat he'd put in the case would be too much for him to feel comfortable.

On to plan b. I found an empty case for on fleabay for ~$200. Supposedly in good shape with less than 15k miles on it. Sounds like I'll be springing for that and putting all my internals into that one. Anything I should look out for before purchasing?

I'm already in way over my head, I figure why not go all out and swap cases and then figure out how to set the preload and all that jazz Perhaps a dumb question, but will preload be different since I'd be using matching case halves, not mixing cases from 2 different motors? I'm sure I'll be asking a million questions here soon if I get to reassembly.

In other news, keep in eye out in the classifieds for a nice ST4s part out






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post #23 of 51 (permalink) Old Apr 16th, 2019, 7:34 pm
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My friend has an ST4s that needs to be parted out. It's here in Mass. I believe the engine still runs well...Would you like me to ask him?

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post #24 of 51 (permalink) Old Apr 16th, 2019, 8:24 pm Thread Starter
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My friend has an ST4s that needs to be parted out. It's here in Mass. I believe the engine still runs well...Would you like me to ask him?
I'd definitely be interested!

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post #25 of 51 (permalink) Old Apr 17th, 2019, 2:28 pm
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I'd definitely be interested!

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Looks like he sold the engine. here's his email RE: to me:

Engine is solid. These engines are most desirable as 851 race bike upgrades... But time to part out. Cheaper to buy another than fix.

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post #26 of 51 (permalink) Old Apr 18th, 2019, 2:22 pm
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Engine is sold? Or engine is solid?

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post #27 of 51 (permalink) Old Apr 18th, 2019, 2:55 pm
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Do you not have the missing piece of case?
I have had worse cases repaired with no problems. Look also at monster s4r for donor motors with similar cases.
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post #28 of 51 (permalink) Old Apr 19th, 2019, 9:34 am
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Engine is sold? Or engine is solid?
He was saying that the engine was in solid condition, but it has been sold. Sorry for the confusion.

And he inferred that it's cheaper (for him) to buy another ST4s than to repair his...
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post #29 of 51 (permalink) Old Apr 19th, 2019, 10:27 am
 
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I'm already in way over my head, I figure why not go all out and swap cases and then figure out how to set the preload and all that jazz Perhaps a dumb question, but will preload be different since I'd be using matching case halves, not mixing cases from 2 different motors? I'm sure I'll be asking a million questions here soon if I get to reassembly.

The preload on the bearings is needed for the bearings to operate optimally. It will not change with different cases. If I remember correctly, the factory manual gives an interference number (like .015 mm something) that you use to set the preload. You add shims (thin washers) to achieve your interference. The interference is achieved when you do your final torque on the bolts that clamp the inner cases together.
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post #30 of 51 (permalink) Old Apr 19th, 2019, 4:34 pm
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FWIW

here are before and after shots of a broken mount on a DS1000 engine
The weld repair was only $50
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