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Alternator Bolt #2868477
01/03/21 02:11 PM 01/03/21 02:11 PM
Joined: Aug 2008
Posts: 395
Milan Ohio
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ct440rod Offline OP
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70 challenger 440 can not keep alternator belt tight. Right now on the slot bracket just has a bolt with flat washer and lock washer. Can someone tell me what was original ? I would think the bolt would have a loose serrated washer. Right now I'm going have to put a a heli coil in alternator because I overtighten the bolt.
Re: Alternator Bolt [Re: ct440rod] #2868482
01/03/21 02:19 PM 01/03/21 02:19 PM
Joined: Nov 2007
Posts: 21,825
Kirkland, Washington
Pacnorthcuda Offline
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Pacnorthcuda  Offline
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Is the upper bolt supported by spacers?
Re: Alternator Bolt [Re: Pacnorthcuda] #2868497
01/03/21 02:44 PM 01/03/21 02:44 PM
Joined: Aug 2008
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Milan Ohio
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ct440rod Offline OP
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yes
Re: Alternator Bolt [Re: ct440rod] #2868530
01/03/21 04:10 PM 01/03/21 04:10 PM
Joined: Apr 2011
Posts: 315
Ontario, Canada
RealWing Offline
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Ontario, Canada
Not sure about '70 E body 440's, but the ICCA 68-70 B Body Fastener Reference Manual shows a 5/16-18x0.88 SEMS Hex head bolt with a 0.75" non serrated loose washer.
A flat washer under a lockwasher defeats the whole purpose of a lock washer!!
Jim

Alternator bolt001.jpg
1970 Superbird 440-6bbl, auto
1969 Barracuda 340-4bbl, FB Formula S auto
1969 Barracuda 6.1 L Hemi, 5 speed, Convertible
2022 Can Am Spyder RTL
Re: Alternator Bolt [Re: RealWing] #2868725
01/04/21 12:51 AM 01/04/21 12:51 AM
Joined: Aug 2009
Posts: 1,317
Ohio
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jlatessa Offline
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Ohio
I don't think that's correct....just my 2 Cents

Joe
Re: Alternator Bolt [Re: jlatessa] #2868808
01/04/21 11:52 AM 01/04/21 11:52 AM
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Posts: 395
Milan Ohio
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ct440rod Offline OP
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Yes seems to be to short. Bolt I took out had 1" thread showing after washers and I don't think that is long enough.

Rod
Re: Alternator Bolt [Re: ct440rod] #2868810
01/04/21 11:55 AM 01/04/21 11:55 AM
Joined: Jun 2003
Posts: 21,438
It's a dry heat
gtx6970 Offline
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It's a dry heat
Is the lower bolt loosening and sliding down the lower bracket?
if so there would be some heavy scratches in the bracket


Or is the belt stretching
Re: Alternator Bolt [Re: gtx6970] #2868822
01/04/21 12:21 PM 01/04/21 12:21 PM
Joined: Jan 2003
Posts: 13,595
md
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mopars4ever Offline
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md
Some years ago some of the Quanta resto belts were known for stretching. I don`t know if they are any better today or not. I never had a stretching problem when using a mopar belt.
Re: Alternator Bolt [Re: mopars4ever] #2869221
01/05/21 09:53 AM 01/05/21 09:53 AM
Joined: Jun 2014
Posts: 1,326
VA
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dragon slayer Offline
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VA
That alternator bolt is correct. 7/8" long with 3/4" cap washer. LG head is another common example. If you look at the alternator there is only so much thread in the front cover. So 7/8" plenty long. If you stripped your cover you need to fix that. Cover is only thick as nut so a longer bolt does no good plus gets bolt closer to rotor.

If it is not the belt, what about the top bolt going into the head. Many time they maybe too short with only a few threads engaged. That play an important part in locking up the alternator via the sleeves. Loosening the alternator bolt without loosening that bolt and my alternator doesn't pivot.
Re: Alternator Bolt [Re: dragon slayer] #2869283
01/05/21 01:28 PM 01/05/21 01:28 PM
Joined: Sep 2009
Posts: 704
WV
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Little Detroit Offline
super stock
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Posts: 704
WV
and you can buy the correct hard ware here, littledetroitrestorations.com
Re: Alternator Bolt [Re: dragon slayer] #2869466
01/05/21 06:55 PM 01/05/21 06:55 PM
Joined: Jan 2004
Posts: 8,273
fredericksburg,va
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cudaman1969 Offline
master
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fredericksburg,va
Originally Posted by dragon slayer
That alternator bolt is correct. 7/8" long with 3/4" cap washer. LG head is another common example. If you look at the alternator there is only so much thread in the front cover. So 7/8" plenty long. If you stripped your cover you need to fix that. Cover is only thick as nut so a longer bolt does no good plus gets bolt closer to rotor.

If it is not the belt, what about the top bolt going into the head. Many time they maybe too short with only a few threads engaged. That play an important part in locking up the alternator via the sleeves. Loosening the alternator bolt without loosening that bolt and my alternator doesn't pivot.

^^^^^^^ agree removed many many of them thru 55 years.
Re: Alternator Bolt [Re: RealWing] #2869612
01/06/21 10:15 AM 01/06/21 10:15 AM
Joined: Aug 2008
Posts: 395
Milan Ohio
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ct440rod Offline OP
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ct440rod  Offline OP
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Milan Ohio
Originally Posted by RealWing
Not sure about '70 E body 440's, but the ICCA 68-70 B Body Fastener Reference Manual shows a 5/16-18x0.88 SEMS Hex head bolt with a 0.75" non serrated loose washer.
A flat washer under a lockwasher defeats the whole purpose of a lock washer!!
Jim

Been in machine repair for 45 years and have always used flat washers with lock washers. The flat washer gives something for the lock washer to bite into. Just my 2 cents.
Re: Alternator Bolt [Re: ct440rod] #2875446
01/17/21 12:09 PM 01/17/21 12:09 PM
Joined: Aug 2008
Posts: 395
Milan Ohio
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ct440rod Offline OP
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Joined: Aug 2008
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Milan Ohio
What is the best thread repair insert available ?

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