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03-12-2022, 06:54 PM
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#1 |
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Registered User
 Join Date: Aug 2019
Location: Cheraw
Posts: 1,300
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LS flywheel bolts
I am replacing the rear main seal on my 5.3L Yukon. Are the flywheel bolts torque to yield and will they need to be replaced? If I need to replace them, where can I get them? Where can I look up the torque specs for this engine?
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03-12-2022, 09:24 PM
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#2 |
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Registered User
Join Date: Jun 2015
Location: Carlos MN
Posts: 2,132
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Re: LS flywheel bolts
I've used the stock ones over and I have used ARP. No failures with either. They are an odd ball size so you can't get 10.9 bolts down at the local hardware store.
I don't recall the torque spec. Make sure to use Loctite to seal the bolt threads or you will get a oil leak. |
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03-12-2022, 11:03 PM
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#3 |
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low n' slo
 
Join Date: Mar 2009
Location: rosenberg, texas
Posts: 5,175
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Re: LS flywheel bolts
i want to say they are re usable...i reused mine. this is from ls1tech.com
1. Tighten the engine flywheel bolts a first pass in sequence to 20 N·m (15 lb ft). 2. Tighten the engine flywheel bolts a second pass in sequence to 50 N·m (37 lb ft). 3. Tighten the engine flywheel bolts a final pass in sequence to 100 N·m (74 lb ft).
__________________
67 1/2 ton Suburban - Project DRGNWGN. Build thread  -_--_--_ _________ _--_-_ -/____|__|__\__ ,.,,,.,.,,.,|_O _______ O_] |
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03-13-2022, 07:22 AM
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#4 |
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Post Whore
 
Join Date: May 2015
Location: Alabama
Posts: 14,670
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Re: LS flywheel bolts
only ones ive found that specify tty are head, rod, and balancer bolts
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Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
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04-02-2022, 08:26 PM
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#5 |
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Registered User
Join Date: Jul 2014
Location: North-central Virginia
Posts: 1,104
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Re: LS flywheel bolts
I've seen photos of the carnage that results when a flywheel lets loose. I'm okay with reusing bolts elsewhere, but I wanted the best bolts possible to join the flywheel and the crankshaft together.
I used ARP 234-2801 bolts. These are actually intended for LT1 gen5 engines, but they fit fine in a LS engine. They have a much longer thread length than stock bolts, but are not long enough to hit the bearing cap behind the crank flange. This is assuming you're using a 4.8/6.0 truck flywheel. If you're using a car flywheel, it might be thinner, and the bolts might stick out too far on the front side of the flange.
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1987 C6P V20 truck, 2010 LMG 5.3, AFM delete, 2010 Camaro exhaust manifolds, 1997 nv4500, 1991 np241c, hydroboost, 2005 14bff axle & driveshaft, drop-n-lock gooseneck, 4.10 gears, stock suspension, rims, and tires. Still a work in progress. Any questions or suggestions are welcome! |
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04-03-2022, 10:09 AM
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#6 |
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Senior Member
Join Date: Mar 2015
Location: washington
Posts: 2,296
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Re: LS flywheel bolts
The bolts are not torque to yield.
Been around a long time and never observed a bolt failure on a flywheel. I have seen the results of the flywheel explosions from centrifugal force but not from the bolt failure. ARP bolts are about $32. If it makes you feel better by all means use them. Last edited by Accelo; 04-08-2022 at 09:56 AM. |
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04-04-2022, 07:17 AM
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#7 |
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Registered User
Join Date: Sep 2020
Location: Cleveland, Ohio
Posts: 556
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Re: LS flywheel bolts
I have reused them many times. Just be sure to take a wire wheel to the threads to get the green sealer off and put new sealer on the threads. I use Permatex sealer. If they leak, you will have oil over your flywheel and clutch as the holes are drilled through on LS engines.
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