Dane
Expert Class
Posts: 235
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posted May 11, 2009 12:34 PM
 Edited By: Dane on 11 May 2009 20:37
Spun #1 main bearing.....
looks like it may have taken the cases out......beat the oil groove up pretty good....my question is new cases or can they be repaired? Might be hard to tell w/o pictures, will post some later
  
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KZScott
Needs a life
high on speed
Posts: 7235
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posted May 11, 2009 05:28 PM
hmm, maybe tigged up and then line honed? a little dremmel work on the oil groove?
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entropy
Moderator
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posted May 12, 2009 01:47 AM
Dane,
spun #1 main????????? actually spun it??????
That is very. very weird. how many miles/races on that motor.
Also take a look at the crank thrust "bearing" surfaces. they are easy to scootch when bearings go south
I don't know anyone who does that kind of case repair.
ebay??
new cases = $850 from R Ayers or equivalent.
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Dane
Expert Class
Posts: 235
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posted May 12, 2009 04:26 AM
Edited By: Dane on 12 May 2009 14:27
Karl, Kz......looks as if the locking tab on the bearing was bent straight and was spinning around in the journal. Had about 15 1/4 mile WFO passes on the motor. got the dreaded one quick blink on the oil light so I was checking the pick-up for trash when I found brass and went searching from there. Engine never made any weird noises or sounds .......I was also thinking @ New cases or Fleabay........I've heard of spinning the rod bearing but never a main ......hmmm
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted May 12, 2009 04:30 AM
We do line boring and honing but we don't have mandrels that small.
The cost of the repair if done properly would be expensive. 1/2 to 2/3 of the cost of new cases. Just not worth it.
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Dane
Expert Class
Posts: 235
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posted May 12, 2009 05:01 AM
quote:
We do line boring and honing but we don't have mandrels that small.
The cost of the repair if done properly would be expensive. 1/2 to 2/3 of the cost of new cases. Just not worth it.
Thank for the info Y2, I knew the diagnosis wasn't going to be good...OUCH!!!
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whitehendrix
Zone Head
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posted May 16, 2009 07:27 PM
MAN thats horrible!! dammit bro.. sorry to hear of the nasty luck.
hopefully you can find a "cheap" fix or something.
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Dane
Expert Class
Posts: 235
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posted May 20, 2009 10:17 AM
Edited By: entropy on 22 May 2009 07:13
http://i369.photobucket.com/albums/oo135/cdn12r/school012.jpg Yea bad news for sure, just looking forclean cases
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jesster
Parking Attendant
Posts: 3
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posted June 05, 2009 04:14 PM
Spun a main on my bored zx12. fucked all mains and big ends plus crank and rods.
Couldnt get another set of cases so despite contrary adivce I had the spun bearing seat welded over.I made up a tool/jig to re cut the bearing seat with the cases bolted together(torqued). The new seat has to be pefectly in line with the other seats.To do this I mounted a bearing in each of the other seats with a shaft for the adjustable tool head running thru them. (if that makes sense) a boring-head to a mandrel sized to the ID of the main bearing shells and used that to machine the knackered seat .Another way to hold the drive shaft was to use 4 (one in each main) wheel bearings (40 x 25) A 25mm shaft running thru. This kept the seats aligned. Adjustability was achieved by making the head with a 4mm grub scsew pushing the tool tip out. Also head was made to hold a small 6mm shaft so a polishing wheel could be held to finnish surface.
Bit of patience, sharp tools ,small cuts and lots of measuring. Recut oilways Job done.
CAN be done. Maching needs to be meticulous tho.
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Dane
Expert Class
Posts: 235
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posted June 06, 2009 06:14 AM
Edited By: Dane on 6 Jun 2009 17:32
Thanks for the info. Jesster, waiting to find another set of cases...Might have to buy a new set.  Time is running out for me for the Texas Mile in Oct.
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MadMike
Moderator
FEAR THE BLACK FLAG!!!!!!!!
Posts: 6579
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posted June 06, 2009 06:25 AM
quote:
Spun a main on my bored zx12. fucked all mains and big ends plus crank and rods.
Couldnt get another set of cases so despite contrary adivce I had the spun bearing seat welded over.I made up a tool/jig to re cut the bearing seat with the cases bolted together(torqued). The new seat has to be pefectly in line with the other seats.To do this I mounted a bearing in each of the other seats with a shaft for the adjustable tool head running thru them. (if that makes sense) a boring-head to a mandrel sized to the ID of the main bearing shells and used that to machine the knackered seat .Another way to hold the drive shaft was to use 4 (one in each main) wheel bearings (40 x 25) A 25mm shaft running thru. This kept the seats aligned. Adjustability was achieved by making the head with a 4mm grub scsew pushing the tool tip out. Also head was made to hold a small 6mm shaft so a polishing wheel could be held to finnish surface.
Bit of patience, sharp tools ,small cuts and lots of measuring. Recut oilways Job done.
CAN be done. Maching needs to be meticulous tho.
and what would you charge to do someone elses?
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