Bracket Talk
Flexplate bolt heli-coil?
April 22, 2024, 08:28 AM
DougFlexplate bolt heli-coil?
Anyone have any issues using a heli-coil in a crankshaft for a flexplate bolt? I have no idea how it happened, just got the motor back from freshening and dyno time and 1 of the bolt holes in the crank had the threads galled and messed up, tried a thread chaser with no luck, made a little jig to run a tap through and caught the good threads and it cleaned up and the bolt runs through it smooth now but it definitely feels looser than the others, I put loctite on the bolt and it feels like it's pulling the threads, I stopped at 60 ft.lbs., all the others tightened to 85 as normal, I'd hate to screw something up over a $5.00 bolt
April 22, 2024, 08:43 AM
CURTIS REEDI think it's one of those, what do you have to lose situations.
I would have zero problems running a Heli-coil in it. If it worries you about screwing in the bolt you can use a short stud and Loc-tite it in. They make Heli-coils specifically for using a stud also. I realize that is a short stud but it's just something to consider. Usually a Heli-coil is about as strong as the original base metal. There is some pretty good info in this document.
https://www.stanleyengineeredf...c-2000_rev11_web.pdf
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April 22, 2024, 10:48 AM
FootbrakeJimI think I would feel better about using a heli-coil, than an under-tightened bolt with limited threads.
Dan "Jim" Moore
Much too young to feel this damn old!!
April 22, 2024, 11:11 AM
1legIf it's a chevy I think I would take it out 1/2-20.
Meziere Tech.
Make sure your water pump is on whenever you check your coolant level.
April 22, 2024, 11:23 AM
GoobA properly installed Heli-Coil is as good or better than the original thread.
"Despite the high cost of living, it remains popular."
Dave Cook
N375
April 22, 2024, 03:44 PM
Top355xLook at a time sert instead but I would do either over a screwed up threads
April 22, 2024, 05:09 PM
imakehpYou can re-tap it to 12mm and just use a metric bolt in that hole
.
Dave
F J B
April 22, 2024, 05:14 PM
Big Stevequote:
Originally posted by 1leg:
If it's a chevy I think I would take it out 1/2-20.
This
April 22, 2024, 11:20 PM
rustyit seems the helicoil would be the best choice you could still go bigger later if needed
honesty is the best policy,insanity is a better deffense
1.036, 6.16@ 224
April 23, 2024, 07:24 AM
CURTIS REEDI can't see drilling and tapping oversize making it a ba$tard when repairing it to stock size is a viable method?
____________________________
2017 and 2018 Osage Casinos Tulsa Raceway Park No-Box Champion
2018 Div4 Goodguys Hammer award winner
April 23, 2024, 10:04 AM
rustythats what i was trying to say curtis lol
honesty is the best policy,insanity is a better deffense
1.036, 6.16@ 224
April 23, 2024, 11:26 AM
CURTIS REEDquote:
Originally posted by rusty:
thats what i was trying to say curtis lol
Great minds. LOL
____________________________
2017 and 2018 Osage Casinos Tulsa Raceway Park No-Box Champion
2018 Div4 Goodguys Hammer award winner
April 23, 2024, 04:18 PM
Big SteveCould just cover the threads in JB weld, torque it to 60lbs and send it. Bet its stays put until the next time you pull the engine.
April 23, 2024, 05:01 PM
Goobquote:
Originally posted by Big Steve:
Could just cover the threads in JB weld, torque it to 60lbs and send it. Bet its stays put until the next time you pull the engine.
Does it really need all the bolts?
"Despite the high cost of living, it remains popular."
Dave Cook
N375
April 23, 2024, 10:03 PM
imakehpquote:
Originally posted by CURTIS REED:
I can't see drilling and tapping oversize making it a ba$tard when repairing it to stock size is a viable method?
If the crank is out of the engine and can be mounted in a mill or at the very least a good drill press then by all means repair with an insert of some sort....but if you're laying under the car in the middle of your driveway or the pits, a 12mm tap will follow the correct angle of a striped out 7/16 hole....it's a quick, fairly accurate repair that holds. You can always drill and tap for an insert next time you take the engine apart...or really "ba$tardize" it and drill and tap all the holes to 1/2"...
.
Dave
F J B
May 09, 2024, 02:22 PM
Triple Nickelx2 for the time-sert threaded insert. Amazon has them.
May 10, 2024, 08:48 AM
Dave Koehlerquote:
Originally posted by 1leg:
If it's a chevy I think I would take it out 1/2-20.
sounds reasonable but that changes the balance when only changing one.
Not to mention having to modify the holes on a replacement flexplate.
Helicoil makes the most sense.
Dave Koehler - Koehler Injection -
http://www.koehlerinjection.comFuel Injection - Nitrous Charger - Nitrous Master Software - Balancing
99% of fuel injection problems are electric.
May 10, 2024, 10:33 AM
BP75885 foot lbs??
Raceless in California!
May 10, 2024, 11:57 AM
Big Stevequote:
Originally posted by BP758:
85 foot lbs??
Thats what ARP recommends with their 7/16 flexplate bolts. I would use ARP on the face of the bolts and red loctite on the threads. Anytime I removed the flexplate I would install new bolts, they are pretty inexpensive to keep a couple of sets in the trailer
As far as 1/2 inch bolts go and *******izing the crank, there is a bunch of blown BBC out there with 1/2 20 bolts, its is an option when ordering a Bryant or Winberg billet crank. I never had any problem but have seen the 7/16 bolts shear off.
Yea I know the OPs car isnt blown, just agreeing it is a viable option since you will still have to drill it out to put in a Helicoil
May 11, 2024, 04:10 PM
BP758quote:
Originally posted by Big Steve:
quote:
Originally posted by BP758:
85 foot lbs??
Thats what ARP recommends with their 7/16 flexplate bolts. I would use ARP on the face of the bolts and red loctite on the threads. Anytime I removed the flexplate I would install new bolts, they are pretty inexpensive to keep a couple of sets in the trailer
As far as 1/2 inch bolts go and *******izing the crank, there is a bunch of blown BBC out there with 1/2 20 bolts, its is an option when ordering a Bryant or Winberg billet crank. I never had any problem but have seen the 7/16 bolts shear off.
Yea I know the OPs car isnt blown, just agreeing it is a viable option since you will still have to drill it out to put in a Helicoil
.
Thanks Steve
Raceless in California!