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02-27-2007, 07:29 PM
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#1
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11 Second Club
Join Date: Feb 2007
Location: elmer
Posts: 274
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torque specs on crank pulley bolt ???
i forget.....thanks
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02-27-2007, 07:37 PM
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#2
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10 Second Club; Has fan club
Join Date: Dec 2005
Location: Delmont nj
Posts: 4,369
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Crank pulley bolt on what year? what engine? we need to know these things so we can help you lol!
for an LS1
Service manual has two specs for installing the pulley - one with the new and one with the old bolt. With the new, the pulley is installed with the bolt seat face of the pulley .095"-.175" sticking out from the end of the crank. Then the bolt is torqued to 37 ft. lbs. and then rotated another 140 degrees. With the old bolt the pulley is similarly installed and the old bolt is torqued to 240 ft. lbs.
LT1's
Crank Pulley Bolts 63 lb. ft.
Crank Hub Bolt 74 lb. ft.
__________________
01' Z06 62k miles. Vararam, Longtubes, off road xpipe, tuned by me. Times TBA
2001 Corvette, Bolt ons , tuned 10.75@124.56 mph 1.38 60' Sold
1997 Saturn Sc1 5spd DOHC swapped
Bolt ons, decked head, stock intake cam on exhaust side, lotsa weight redux
13.22@102.32 mph 1.93 60'
12's on moda? One day
Last edited by 98tadriver; 02-27-2007 at 07:40 PM.
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02-27-2007, 08:08 PM
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#3
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11 Second Club
Join Date: Feb 2007
Location: elmer
Posts: 274
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yes ls1 ....thanks
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02-27-2007, 08:24 PM
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#4
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10 Second Club; Has fan club
Join Date: Dec 2005
Location: Delmont nj
Posts: 4,369
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no prob
__________________
01' Z06 62k miles. Vararam, Longtubes, off road xpipe, tuned by me. Times TBA
2001 Corvette, Bolt ons , tuned 10.75@124.56 mph 1.38 60' Sold
1997 Saturn Sc1 5spd DOHC swapped
Bolt ons, decked head, stock intake cam on exhaust side, lotsa weight redux
13.22@102.32 mph 1.93 60'
12's on moda? One day
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02-28-2007, 08:26 AM
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#5
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Stalker
Join Date: Aug 2004
Posts: 12,083
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on an LS1, you do not ever want to use the old bolt as the final installed bolt. Both procedures are used as one...
whenever changing the pulley, to reinstall the new pulley, you use the old bolt first and torque it down to 240 ft/lbs to ensure that the pulley is fully seated. Once that is done, you remove the old bolt and install a BRAND NEW bolt. the new bolt is torqued to 37 ft/lbs, then rotated another 140 degress.
i believe this is basically because GM decided to use torque to yeild bolt, just liek they did with the stock headbolts, which should also never be reused.
Last edited by V; 02-28-2007 at 08:28 AM.
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03-01-2007, 10:52 AM
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#6
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2007 Member of the Year
Join Date: Oct 2004
Location: Seabrook, TX
Posts: 14,281
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TTY bolts also include rocker arm bolts, rod bolts, and IIRC the cam bolt.... on 3.8s at least.
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Junk the pos, spend the money on beer, acquire headache.
Same result cept this headache doesnt last months.
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