Helicoil and Rocker Cover Bolts

[Anthonypowell]

I was replacing the Rocker Cover bolts to 9NM when for no reason the the thread stripped in the cylinder barrel so I drilled out the offending stripped thread and inserted a Helicoil no problems and then with no apparent warning the new bolt snapped as I was putting it in this was due to a manufacturing fault which meant I had to now drill out the broken bolt and try to insert as best I can a second Helicoil. this is now holding and I can tighten the new bolt to 9 NM but I can see the new bolt is slightly cross threaded caused by the angle of the Helicoil. Has anybody here used Metal weld as I was thinking of applying this in the hole allowing it to dry and then re tapping any ideas
Many thanks
Tony

 

[kennyc]

if the bolt will tighten and hold, then leave it, no point in looking for trouble! the rocker covers are not difficult to seal and one bolt slightly out of true isn't going to hurt.
PS as long as you don't go at it like Garth's big brother, there is no need to use a torque wrench on those bolts.

 

[ghiribizzo]

If it is a problem, a Würth Time-Sert is your solution.
Have a google.

 

[littleredrooster]

Stripped threads and broken bolts? I think your torque wrench needs to be calibrated or replaced!

 

[davegs]

Stripped threads and broken bolts? I think your torque wrench needs to be calibrated or replaced!

Yes, sling it away no need anyway just feel it tight It's not like a head bolt, not stressed.

 

[Anthonypowell]

ref head studs

Thanks for your advice and help

Tony

 

[Bendy toy]

Stripped threads and broken bolts? I think your torque wrench needs to be calibrated or replaced!

Even better dont use one! Its should be obvious when the bolt is tight (thread springs slightly) so why trust to a machine that clearly cant do it right.

Torque wrenches are only needed where a set of bolts must all have equal torque or when high tensile threads are pulled up so tight you lose the thread spring of a normal bolt.

 

[kennyc]

Even better dont use one! Its should be obvious when the bolt is tight (thread springs slightly) so why trust to a machine that clearly cant do it right.

Torque wrenches are only needed where a set of bolts must all have equal torque or when high tensile threads are pulled up so tight you lose the thread spring of a normal bolt.

and it gives workshop managers an excuse as to why the stripped thread is your responsibility to pay for and not due to heavy handed mechanics don't ask me how I know this

 

[Welshman]

I like to use an allen key but the "long" side in the bolt short side in the hand

 

[Bugbear]

Not much help but from an engineering point of view bolts securing regularly, or even occasionally removed items, where they thread into aluminium are not a good design.

Far better to use an insert with a stud and a nut/nylock/washer arrangement.

 

[Welshman]

Yes but if you take an expected lifetime in miles divide it by major service interval its ok?