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Crank twisted?

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Old Jul 17, 2008 | 06:07 PM
  #1  
chas0218's Avatar
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From: Corning NY
Car: 86' IROC
Engine: 388
Transmission: Built 700r4
Axle/Gears: 3.08 non-posi
Crank twisted?

Last night i blew a radiator hose and noticed that my crank seemed to wobble as the pully turned...is this a sign of twisted or bent crank?...the engine doesnt seem to make any out of the ordinary noise or vibration...should i be worried?....its maybe moving 1/8th to 1/4 inch
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Old Jul 17, 2008 | 06:19 PM
  #2  
//<86TA>\\'s Avatar
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From: Central NJ
Car: 86 Trans Am
Engine: 408 stroker sbc
Transmission: TKO600
Axle/Gears: Moser full floater m9, 3:70 trutrac
Re: Crank twisted?

this is when the motor is running or are you turning it by hand? i would doubt the crank is bent.
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Old Jul 17, 2008 | 07:28 PM
  #3  
Sonix's Avatar
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From: Calgary, AB, Canada
Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
Re: Crank twisted?

No, I highly doubt it's a crank problem. You'd think it's armageddon if it was.
Sounds like your balancer or pulleys are loose.
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Old Jul 17, 2008 | 08:25 PM
  #4  
chas0218's Avatar
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Joined: Jun 2008
Posts: 660
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From: Corning NY
Car: 86' IROC
Engine: 388
Transmission: Built 700r4
Axle/Gears: 3.08 non-posi
Re: Crank twisted?

its when the motor is idling at 800 rpms...it moves but not a lot...i would think i would know when i change my oil this weekend..i figure there will be a lot of metal shavings...


what motor oil weight should i run?...im going synthetic but dont know what weight i was thinking like 5w-30 or 5w-20
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Old Jul 17, 2008 | 08:28 PM
  #5  
Apeiron's Avatar
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: Crank twisted?

10w-30 is fine.
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Old Jul 17, 2008 | 09:10 PM
  #6  
chas0218's Avatar
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Joined: Jun 2008
Posts: 660
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From: Corning NY
Car: 86' IROC
Engine: 388
Transmission: Built 700r4
Axle/Gears: 3.08 non-posi
Re: Crank twisted?

cool thanks for everything!
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