New fasteners on every build
#2234264
01/14/17 10:17 PM
01/14/17 10:17 PM
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Joined: Dec 2004
Posts: 10,558 Rittman Ohio
fourgearsavoy
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I have always used new fasteners on all internal parts every time I build something.I recently got some new ring gear bolts at Summit and was thinking I just changed them 5 years ago when I put the 3.54's in.Do you guys change ring gear bolts,flywheel bolts,pressure plate bolts etc. when you have them apart? I just think it's just cheap insurance to use new top quality fasteners when you have it apart Now I know an aircraft tech and he says sometimes it's better to know what you have instead of using new. Do you guys use new bolts every time you change out rotating high stress parts like flywheels and ring gears? Gus
64 Plymouth Savoy 493 Indy EZ's by Nick at Compu-Flow 5-Speed Richmond faceplate Liberty box Dana 60
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Re: New fasteners on every build
[Re: fourgearsavoy]
#2234287
01/14/17 10:41 PM
01/14/17 10:41 PM
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Joined: Dec 2007
Posts: 18,160 Mass
DAYCLONA
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I Live Here
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I have always used new fasteners on all internal parts every time I build something.I recently got some new ring gear bolts at Summit and was thinking I just changed them 5 years ago when I put the 3.54's in.Do you guys change ring gear bolts,flywheel bolts,pressure plate bolts etc. when you have them apart? I just think it's just cheap insurance to use new top quality fasteners when you have it apart Now I know an aircraft tech and he says sometimes it's better to know what you have instead of using new. Do you guys use new bolts every time you change out rotating high stress parts like flywheels and ring gears? Gus I toss any critical fastener previously used, be it engine, trans, rear end, suspension, braking system, a fastener can only survive just so many stretch, stress, along with heat cycles before failure...I generally prefer to increase the grade/tensile of the fastener if I can when replacing it
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Re: New fasteners on every build
[Re: fourgearsavoy]
#2234299
01/14/17 10:55 PM
01/14/17 10:55 PM
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Joined: Dec 2003
Posts: 22,728 Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,728
Bitopia
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On this topic, I would say one of the most re torqued, without at least a torque wrench, possibly over tightened with an impact, cyclically stressed, non redundant, critical fasteners, is also one of the least replaced items on a high performance car, the wheel studs.
Last edited by jcc; 01/14/17 11:36 PM.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: New fasteners on every build
[Re: Rhinodart]
#2234348
01/14/17 11:50 PM
01/14/17 11:50 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
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About to go away
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No, I don't trust fasteners anymore, how do you know for sure where they are made? The original fasteners worked just fine, if they still look good I use them. ARP
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: New fasteners on every build
[Re: DAYCLONA]
#2235162
01/16/17 04:04 AM
01/16/17 04:04 AM
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Joined: Apr 2012
Posts: 18,880 -
RSNOMO
Moparts Torchbearer
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Moparts Torchbearer
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Posts: 18,880
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I toss any critical fastener previously used, be it engine, trans, rear end, suspension, braking system, a fastener can only survive just so many stretch, stress, along with heat cycles before failure...I generally prefer to increase the grade/tensile of the fastener if I can when replacing it Absolutely spot-on...
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Re: New fasteners on every build
[Re: RSNOMO]
#2235178
01/16/17 10:09 AM
01/16/17 10:09 AM
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Joined: Nov 2003
Posts: 597
robertop
mopar
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mopar
Joined: Nov 2003
Posts: 597
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I toss any critical fastener previously used, be it engine, trans, rear end, suspension, braking system, a fastener can only survive just so many stretch, stress, along with heat cycles before failure...I generally prefer to increase the grade/tensile of the fastener if I can when replacing it Absolutely spot-on... That's what most people believe. Without any metallurgical background, of course...
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Re: New fasteners on every build
[Re: robertop]
#2235235
01/16/17 12:49 PM
01/16/17 12:49 PM
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Joined: Dec 2007
Posts: 18,160 Mass
DAYCLONA
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I Live Here
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I toss any critical fastener previously used, be it engine, trans, rear end, suspension, braking system, a fastener can only survive just so many stretch, stress, along with heat cycles before failure...I generally prefer to increase the grade/tensile of the fastener if I can when replacing it Absolutely spot-on... That's what most people believe. Without any metallurgical background, of course... Actually I have 35+ years experience in a metallurgical/engineering field
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Re: New fasteners on every build
[Re: robertop]
#2236836
01/18/17 05:35 PM
01/18/17 05:35 PM
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Joined: Dec 2004
Posts: 10,558 Rittman Ohio
fourgearsavoy
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So in your expert opinion is a visual inspection all that is needed to reject a fastener? I have been a technician for over 30 years and have rebuilt probably 100 engines of all types. I always replace head bolts and main cap bolts on an engine that has been in service for 50 years and is going to be whooped on repeatedly. On regular passenger car engines that have come in to the dealership that need a rebuild due to head gasket failure I always replace the head bolts. What is your professional opinion on reusing plastic region stretch bolts. I've been doing a lot of rebuilds lately and sometimes the head bolts don't seem to pull that 90 degree turn all the same, some feel like they pull down easier than the others. The bolts are too long to fit my calipers so I have never tried to measure them for comparison. Thanks Gus
64 Plymouth Savoy 493 Indy EZ's by Nick at Compu-Flow 5-Speed Richmond faceplate Liberty box Dana 60
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Re: New fasteners on every build
[Re: fourgearsavoy]
#2237070
01/19/17 01:03 AM
01/19/17 01:03 AM
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Joined: Nov 2003
Posts: 597
robertop
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mopar
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Obviously if a bolt has stretched or is corroded, bent, or visually damaged, by all means throw it away. If you are not sure, you can measure the hardness, check its structure and grade (destructive tests, in general) and chemistry to see where you are. And as far as fatigue one must know if the stress on it is in the fatigue range, and so is temperature, that has to be high enough to affect the metal. All of these tests make sense in a lab, but practically it's much cheaper and easier to use new fasteners, so I don't have a problem with that.
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Re: New fasteners on every build
[Re: robertop]
#2237187
01/19/17 11:33 AM
01/19/17 11:33 AM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
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Obviously if a bolt has stretched or is corroded, bent, or visually damaged, by all means throw it away. If you are not sure, you can measure the hardness, check its structure and grade (destructive tests, in general) and chemistry to see where you are. And as far as fatigue one must know if the stress on it is in the fatigue range, and so is temperature, that has to be high enough to affect the metal. All of these tests make sense in a lab, but practically it's much cheaper and easier to use new fasteners, so I don't have a problem with that. I look at it this way, there are certain fasteners in an engine that, if they fail, the cost to repair far outweighs the cost to initially replace. Rod and main bolts come to mind. Head bolts don't quite fall into that category for me but the thought of hanging over a fender wrasslin' a head off because the headgasket failed due to a soft headbolt puts those into the replace category for me. The rest, not so much.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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