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08-03-2009, 12:26 AM
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#1 |
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Registered User
Join Date: Jan 2008
Location: Las Vegas, Nv
Posts: 954
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Striped thread on crank
So I have a striped thread on the back of my crank where the flywheel mounts up and I'm wondering if I can drill and tap it larger. I'm aware of balancing issues, so should I drill all six holes larger and tap them all so the bolts are the same size and balanced?
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08-03-2009, 07:17 AM
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#2 |
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Registered User
 
Join Date: Jul 2006
Location: alabama
Posts: 647
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Re: Striped thread on crank
Yes, and to be safe, yes.
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08-03-2009, 05:19 PM
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#3 | |
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Registered User
Join Date: Jan 2008
Location: Las Vegas, Nv
Posts: 954
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Re: Striped thread on crank
Quote:
Thanks
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08-03-2009, 05:38 PM
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#4 |
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Registered User
Join Date: May 2008
Location: houston, tx
Posts: 549
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Re: Striped thread on crank
I'd say they're so close to the crank center line that it wouldn't matter that much if you just put a heli-coil in it. If you're really worried, then just do the one opposite the stripped one and it will still be balanced. I wouldn't do all 6.
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------------------------------- '66 GMC Custom Fenderside LWB '90 IROC - L98 '97 1200C Sportster |
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08-03-2009, 05:57 PM
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#5 | |
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Registered User
Join Date: Dec 2008
Location: Yay Area CA
Posts: 2,329
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Re: Striped thread on crank
X 2 on the heli-coil maybe loctite it to the crank
Also consider that the amount of material your adding equals the amount of material removed so the difference in weight is really just the difference of crank material (cast or steel) vs the heli-coil or bolt. If that makes sense.
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1965 GMC shortwide big window 1969 Chevy C20 long (for now) 2005 Silverado 2500HD Crew Cab Quote:
Last edited by fixit-p; 08-03-2009 at 05:59 PM. |
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08-03-2009, 06:04 PM
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#6 |
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283 Drama Queen
Join Date: Dec 2004
Location: Surf City, CA
Posts: 2,435
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Re: Striped thread on crank
 Not enough off-center mass to worry about the out-of-balance issue.* unless of course you're red-lining at 8,000 rpm between every shift. Mac. 
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For about 12 years of my adult life I had a severe speech impediment. My ex-wife never let me get a word in edgewise. |
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08-03-2009, 07:23 PM
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#7 |
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Registered User
Join Date: Jan 2008
Location: Las Vegas, Nv
Posts: 954
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Re: Striped thread on crank
I wish I could spin it at 8000. Probably more like 5500. I'm still going to drill and tap all of them to make sure. I have a scatter shield but I don't want anything coming apart in there.
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08-03-2009, 09:08 PM
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#8 |
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My Carbon Footprint
Join Date: Oct 2008
Location: Orygun
Posts: 5,527
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Re: Striped thread on crank
x10 on the balance issue.
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08-03-2009, 11:10 PM
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#9 |
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Registered User
Join Date: Jan 2008
Location: Las Vegas, Nv
Posts: 954
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Re: Striped thread on crank
Wow. I had never heard of helicoil. I just read up on it. Looks like it will work for about ten bucks. I might just drill and tap the stripped hole and do the same to the opposing bolt hole on the other side to make sure. This fix would be free.
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http://67-72chevytrucks.com/vboard/s...54#post3194654 Last edited by shrunken66stroker; 08-03-2009 at 11:11 PM. |
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08-04-2009, 10:13 AM
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#10 | |
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283 Drama Queen
Join Date: Dec 2004
Location: Surf City, CA
Posts: 2,435
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Re: Striped thread on crank
Quote:
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For about 12 years of my adult life I had a severe speech impediment. My ex-wife never let me get a word in edgewise. |
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