The Forestry Forum

My son has my old 61 which still runs very well.
The problem is with the muffler screws/bolts.
They keep working loose causing the muffler to fail.
Any suggestions?
Helicoil?
He has tried loctite to no avail.

Maybe lock washers under muffler bolt head?
Helicoil is expensive. Before I spent that money, I'd get a 272xp top end for it - esp if P, R or C is scored in any way. IIRC, you gotta change intake adapter and get longer carb bolts.

The old Jonsereds had a good idea for locking the muffler bolts. Here's a pic of my 70E with its locking  plate strap under the bolt heads. Beautiful well built saw from the late 1970s. Definitely going to give it a complete restoration.


 (https://forestryforum.com/gallery/albums/userpics/21589/20150113_090752.jpg?easyrotate_cache=1421163285)

thanks guys

Little off topic but I got two mint jonsered 52's

I had the same problem.
Fixed it with a thread restore tool, new bolts and lock washers.
The metal bolt lock shown above work really good too.
I also used some red Loctite.

As an electrician, i use a tap to restore threads all the time, only difference is i work with smaller screws. If the female threads are damaged you will see it on the male threads too.

Finally got the parts and re-assembled using locktite stripped thread formula.
We'll see how this works.
the lock plate idea is OK but the design of this muffler doesnt allow it.