SXIPro
JM781 Big Bore
- Location
- Here on the 'X' mostly
Anybody?
Torque specs on ADA girdled head?
- Thread starter SXIPro
- Start date
SXIPro
JM781 Big Bore
- Location
- Here on the 'X' mostly
Thank you! And I like the new avatar, it's always nice to have competent folks in your pit crew.
Sanford
ECF
- Location
- Freeride capital of the world
The purpose of torquing isn't only to prevent them from backing off, it also is to prevent bolt and thread damage. 23Ft/Lbs is a little much for a 8mm bolt/thread. If you often R & R the head or bolts, thread damage can occur if over torqued. Its a matter of time. However, if you Helicoil a thread, it is actually stronger and can tolerate 23ft/lbs on an 8mm. If you find yourself needing to over torque to prevent it getting loose, then your threads or bolts may be compromised (provided it has a proper lock-washer or chemical).
I like 18Ft/Lbs for most 8mm bolts and 28Ft/Lbs for 10mm bolts.
T.M.I: Something most never talk or think about when re-using bolts, bolt stretch. On critical assembly and when it allows, this is the proper method used for "torquing" down. Over time a bolt (and nuts) actually fatigues (softens, twists, lenghtens). Nothing can be done to prevent this and its natural. However, bolts should not be reused as often as we reuse them. Lucky for us these aren't mission critical jobs. Technically, studs are so much better it isn't funny. I'm going to also stud my 8mm head.
Last edited:
Idok
F1pro
- Location
- Nations oldest muthaF+++kin city
awesome post sanford....
2 key points that are virtually NEVER discussed
bolt stretch (longer the bolt, the more it can stretch..)
the POSITIVES of helicoils
crammit442
makin' legs
- Location
- here
Sanford
ECF
- Location
- Freeride capital of the world
Well, if we are going to quote manuals then the ADA billet head instructions says..."all head bolts to 18ft/lbs and the girdle nuts to 23ft/lbs."
:biggrin:
douglee25
m3booooy
- Location
- South Jersey
Just remember if you're using the socket cap screws for the head portion and not the OEM head bolts, those should only be torqued to around 18 - 20 ft lbs.
Doug
Doug
2lick
Brap!!!
- Location
- Limerick, PA
So how is a guy to know what to do then...... I have the ADA girled hardware, and soket cap mcmaster head bolts (18-8 I believe... possibly 306)..... I followed the ada instructions.......
douglee25
m3booooy
- Location
- South Jersey
Mcmaster head bolts torque to 18 - 20 ft. lbs. Use the ADA acorn nuts for the studs and torque them to 30 - 34 ft. lbs.
Done.
Doug
douglee25
m3booooy
- Location
- South Jersey
Very true. Most of the steel I've seen them in is 18-8. If that's the case, torque them to 18 - 20 ft lbs.
Doug
Y
yamaslut
Guest
I was told to overtighten my bolts too, but I don't... I tighten them to what ADA says to do... I have never had an issue w/ them comming loose... I really don't think that is an issue...
my method:
15ftlbs head and 18ftlbs girdle
18ftlbs head, 23ftlbs girdle..
re tourque head to 18ftlbs again
go ride...
my method:
15ftlbs head and 18ftlbs girdle
18ftlbs head, 23ftlbs girdle..
re tourque head to 18ftlbs again
go ride...
- Location
- Near Seattle WA
Torque
Listen to Sanford... He is correct in my opinion, and huge torque values aren't nearly as important as "equal" torque. The factory service book might show high torque numbers, but they were designed to last many years without dis-assembly.
Regards,
Randy
Listen to Sanford... He is correct in my opinion, and huge torque values aren't nearly as important as "equal" torque. The factory service book might show high torque numbers, but they were designed to last many years without dis-assembly.
Regards,
Randy
Mike W
Infidel
- Location
- North Florida