Urgent: How can I stop bolts from continually coming loose

theres a few ways..

you just drill and hand broach the hex
you buy them online (or from specialist nut and bolteries)
you drill and tap and thread in a grub screw or a smaller bolt that you can get on with a spanner or socket.

you use a blind driving nut that has a smaller bolt in it wind the nut on, wind the small bolt in do the stud op using the nut, then when the stud is torqued hold the nut with the spanner and then undo the smaller bolt then wind the nut off.

if you have room you can just double nut it.

piece of cake.

desperate people just cut a grove thats 2mm deep with a hack saw and use an impact driver. clever desperate people wind it in with a normal screwdriver put the nut on just enough to stop the slit from splaying and then beat it with an impact driver.

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Originally Posted by johntins

Not a bad idea. Haven't come across that before, but simple. If you can get the studs.

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Dave, spot on, I have some ARP studs with the allen head in the end of the stud scavenged from a motor that was never finished.
The studs will have to be fitted with everything in situ, major job removing the Heat Exchanger, if the studs I have are not suitable, have a friendly engineer with some nice machinery to make them up.
John if the studs were fitted first into the block there would be not enough room to get the bracket in place, piece of **** with the engine out.
The only hassle with the 2 bolts fitted this arvo was that the bolt shanks were about an 1/8" too long, so I had to grind and taper the shank and run a Die Nut up and extend the thread length accordingly, see what happens tomorrow, Regards frank.

G'day Frank,
Almost there!!!! Gee I thought working on my Leyland Mini Clubman was hard. Not anymore!!.
Chris

Bought 2x 3"x 7/16" inch bolts and cut them down and made studs, the top front one had to be 1/4" shorter and a heavy taper on the start of the thread just to be able to get it in to it's spot.
Couldn't get the block end of the thread to bottom out, so had to take it back out and shorten the Nut end of the stud an 1/8", then fit the Nyloc nut so one or two threads were through the nyloc part of the nut.
With the nyloc nut fitted to the shortened stud we could just get the block end of the stud started (heat exchanger was the culprit, in the way), so managed to bottom the stud in the block and wind on the nyloc nut a few more turns to reach the Torque value of F.T..
So finally got the bugger back on nice and tight, going on a run tomorrow so will see if it comes loose again, the last bolt (shortest) we just replaced with this much shortened stud only had about a 1/4" purchase in the thread in the block, so I would say Definitely not a Factory fitted item, thanks again for all the great advice, much obliged, Regards Frank.

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Originally Posted by Tank

Dave, spot on, I have some ARP studs with the allen head in the end of the stud scavenged from a motor that was never finished.
The studs will have to be fitted with everything in situ, major job removing the Heat Exchanger, if the studs I have are not suitable, have a friendly engineer with some nice machinery to make them up.
John if the studs were fitted first into the block there would be not enough room to get the bracket in place, piece of **** with the engine out.
The only hassle with the 2 bolts fitted this arvo was that the bolt shanks were about an 1/8" too long, so I had to grind and taper the shank and run a Die Nut up and extend the thread length accordingly, see what happens tomorrow, Regards frank.

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That Dave... not just a pretty face... ☺

Just a thought make sure you the loctite primer this may help alse have you tried shake proof internal star washers.
Rocky

Sent from my SM-G920I using AULRO mobile app

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Originally Posted by justinc

That Dave... not even a pretty face... ☺

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Fixed it for you...

its configured for radio work.

its kinda like the dentist "we cant show you his face" tooth paste add but its got nothing to do with the privacy for me, its just that most people dont spend their time under their vehicles trying to look up past the engine Im spannering on.

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Originally Posted by Blknight.aus

Fixed it for you...

its configured for radio work.

its kinda like the dentist "we cant show you his face" tooth paste add but its got nothing to do with the privacy for me, its just that most people dont spend their time under their vehicles trying to look up past the engine Im spannering on.

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Ha ha yes i appeared briefly on the first Seriously Series Heading West vid and on camera i am much more awkward than i am already in real life 😮😮😮😕😣😣 at least my county made a half decent backdrop ☺

Jc