Snowblower Forum banner

1 - 10 of 10 Posts

·
Registered
Joined
·
8 Posts
Discussion Starter #1
I am fixing up an older (late 80's) Ariens ST 824 with a Tecumseh motor. I was going through it and noticed the muffler was loose so I tightened the bolts and bent the keeper ears up against the landings on the heads. I let it run in the driveway for about 45 minutes to adjust the carb and when I got done I noticed that the muffler was loose again and the bolts backed out.

Question 1. Is there supposed to be a gasket between the muffler and the manifold?

Question 2. How the heck to I get those bolts to stay tight?

TIA

Mark
 

·
Registered
Joined
·
2,310 Posts
Backed out or pulled out? If the tabs are over the head of the bolts, they can't back out, they have to pull out. If that is the case then your threads are shot. You could try Loc-Tite, a liquid adhesive that you apply to the threads. If that fails you could drill out and re-thread with the next size larger, or tap out and use a Heli-Coil insert, there are others also, some much improved. Heli-Coil is the original and still perfectly fine.
 

·
Registered
Joined
·
2,310 Posts
I hate to unscrew those bolts. Any time you remove bolts from aluminum you are shortening the life of the threads. Besides those threads get destroyed from the extreme heat of the exhaust.

If the threads are holding using the tabs then I wouldn't use Loc-Tite. The only thing I ALWAYS put on exhaust threads is Never-Seize, a high temp graphite paste. If you decide to use Loc-Tite, use a low holding strength.
 

·
Registered
Joined
·
8 Posts
Discussion Starter #7
Thanks J. What do you think about wrapping fine copper wire on the threads before I run them back in? I have read elsewhere that it will strengthen the threads and make the fastener more secure.
 

·
Registered
Joined
·
765 Posts
Install the keeper tabs tight against the flat of the hex bolts you should not need any thread locker. It would be a belt and suspenders redundancy.
As JLawrence said I would use some antisieze on the threads. That is so they come out easy in the future. Unless they are stripped, i would leave it there.

I have noticed most of the Tecumseh engines I work on do not have a muffler gasket. I think they dropped using one a long time ago.
 

·
Super Moderator
Joined
·
9,888 Posts
Thanks J. What do you think about wrapping fine copper wire on the threads before I run them back in? I have read elsewhere that it will strengthen the threads and make the fastener more secure.
I've never done it but I would worry it might damage the aluminum threads. I don't know which metal is softer but even if the copper is softer I wouldn't want to find out on my engine if it gave before the aluminum threads in the block. :sad2:
 
1 - 10 of 10 Posts
Top