Husqvarna 394, both sets of threads that hold the inner dog are stripped out. Is there enough material in there to drill and tap for the next size larger bolt?
Stripped Bucking Spike Threads
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Could you clean them out good then fill with exopy to drill and tap again
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Sure could
Heli coil will work.
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Do they sell them that small? I believe the OE bolt is 5mm?
Yup I bought some on amazon.a set with the tool and tap for 5mm and 6mm
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Thanks I’ll check that out!
I think your top bold maybe a longer one that screws into to your crankcase halves to help hold them together in most of them I have worked on with some exceptions and it has to be the right length.
Spring-type helicoil.
Epoxy makes weak threads in my experience.
So if I am tapping it to 6MM for the 5MM helicoil wouldnt I be better off just using 6mm bolts?
No.
A helicoil is stainless spring steel. Done properly it is an improved fastening solution over the original.
The 6mm bolt will likely have a correspondingly larger cross-section meaning that it won't stretch the same amount as the original 5mm at the same torque, so it will need to be tighter which will put more load on the reduced amount of brittle magnesium alloy now surrounding the thread. I'm not saying it can't work but it's a second-class solution compared to a helicoil.
Thank you!
I had the same issue you have, except mine was the lower one on a 395. I drilled and tapped to 6mm and it worked great. Had to ream out the spike to get the 6mm thru it I think.
Fatherwheels
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Use a spring washer on the new bolts, it should keep tight without
having to tighten as much.
Did the threads strip tightening them, or did the threads tear off when loosening the bolts,
I find with aluminium that it sticks to the threads of the steel bolt and tears when removing the bolt,
chromed bolts, polished steel also help, I torque them regardless, and spring washers keep them from
vibrating.
Epoxy and re thread.
Else drill bar and make a spacer and bolt spike to bar, use slotted holes if you want adjustment.
having to tighten as much.
Did the threads strip tightening them, or did the threads tear off when loosening the bolts,
I find with aluminium that it sticks to the threads of the steel bolt and tears when removing the bolt,
chromed bolts, polished steel also help, I torque them regardless, and spring washers keep them from
vibrating.
Epoxy and re thread.
Else drill bar and make a spacer and bolt spike to bar, use slotted holes if you want adjustment.
Canyon Angler
Addicted to ArboristSite
Or just give your fasteners a coat of paste wax, then hold them in place (tape?) while the epoxy hardens, then when it's hard you'll have a threaded hole in the epoxy that matches the screws perfectly (assuming you didn't leave globs of wax on the screws). No need to tap...just back out the screws, clean it it up and replace them (just don't overtighten!)
