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#1
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angle torque bolts.
Any one here reuse angle torque bolts and just retorque them./ Other than you are not supposed to reuse them and replace with new ones, have there been any problems?
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GOOD IDEAS ARE OFTEN FOUND ABANDONED IN THE DUST OF PROCRASTINATION |
#2
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If I understand it would be a bolt that would be torqued to an initial value then final torqued using an angle torque meter as opposed to a specific setting? I'm only a diy mechanic but about the only time I heard of a single use bolt is a torque to yield bolt which can only be torqued once which I have no doubt you are familiar with.
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Frank M. 75 Firebird 68 Firebird 400 RAIII 66 Chevy II 461 Pontiac in AZ |
#3
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Before I retired and still worked as a Chrysler tech the factory told us we could reuse head bolts as long as there was no sign of stretching (necking down).
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#4
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Quote:
In addition, there's also a "torque-to-yield" procedure (TTY) which uses a different type of bolt that should NOT be reused. It won't clamp correctly after yielding due to loss of elasticity. Are you asking if someone has "done it anyway" and re-used the TTY bolts? Sorry, just not sure I'm understanding your question. |
The Following User Says Thank You to 65 Lamnas For This Useful Post: | ||
#5
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Quote:
I paint a stripe down the shank of torque/angle bolts. When I remove them later, if the paint stripe is twisted, the bolt is junk. If it's still straight, and not corroded, no thread damage, not visibly necked-down, etc. it's OK to re-use. Photo of Lumina 3.4L DOHC head bolts attached. They're the metric equivalent to 7/16; once the torque/angle procedure is complete...I tested the torque on them and it was approximately equivalent to what a 7/16 head bolt would be torqued to (about 65--70 ft/lbs.) REMOVAL of these bolts required about 160 ft/lbs, (no lube at all on the threads from GM) and I broke a 15mm 3/8" drive Snap-On socket doing that. Had to switch to a 15mm 1/2" drive socket. Torque-to-yield bolts are scrapmetal once removed. If possible, I replace with ARP and then torqued as appropriate. TTY just pisses me off. How can it make ecological and economic sense to throw metal away after one use? Last edited by Schurkey; 04-30-2024 at 07:11 PM. |
The Following User Says Thank You to Schurkey For This Useful Post: | ||
#6
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Thank you all..
65 Lamnas : Just put rear pads and rotors on my 2015 Camaro. Removed the caliper bracket to install the new rotors. All of us oldtimers at the barn had no idea on the torque specs. Looked up a 12mm fine thread 10.9 grade bolt and came up with 96ft.#. After I got home I found out, according to GM, that the bolts were to be replaced with new after removal. BTW, the specs found online were 30 ft.# +90 deg. Your response eased my mind a bit. New bolt are on the way just in case
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GOOD IDEAS ARE OFTEN FOUND ABANDONED IN THE DUST OF PROCRASTINATION |
#7
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I have found if the bolt gets to the point it shouldn’t be used again normally you can feel it stretch to much on that last 30*. It will feel like the torque isn’t increasing much, even though your tightening it yet.
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#8
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Times two, and usually will break if keep torquing. Had a arp head stud do this.
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1963 Cat SD Clone (old school) streeter 1964 GTO post coupe, tripower, 4speed (build) 1965 GTO 389 tripower, 4 speed, driver 1966 GTO dragcar 1966 GTO Ragtop 1969 Tempest ET clone street/strip 1969 GTO Judge RA lll, auto 1969 GTO limelight Conv. 4speed go and show (sold) 1970 GP SSJ 1970 GTO barn find..TLB…390 horse?….yeh, 390 1972 GTO 455 HO, 4 speed, (build) 1973 Grand Safari wagon, 700hp stoplight sleeper 525ci DCI & 609ci LM V head builds |
#9
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Quote:
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#10
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I helped my daughter do a brake job on her 17 Escape. The caliper bracket bolts required torquing. Reused the front bolts no problem. However, one of the rears deformed well below the required torque value. The others were was ok. Bought new bolts from the Ford dealer. 6 in a pack. After two of those deformed well below the required torque value I tightened the next one to about 5 ftlbs below where the others started to deform. (Front bolts are a different size than the rears.)
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Frank M. 75 Firebird 68 Firebird 400 RAIII 66 Chevy II 461 Pontiac in AZ |
#11
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Ken I recently did my 2015 Chevy truck man the specs on the front caliper bracket tp spindle were really high and they used loctite in addition! Had to use a breaker bar and slide the jack handle tube over it!
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
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