How Do I Install Helicoil Properly? - Snowblower Forum : Snow Blower Forums
 
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post #1 of 8 Old 02-14-2019, 02:12 PM Thread Starter
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How Do I Install Helicoil Properly?

I am about to put a helicoil in one of the bolt holes for the muffler. If the hole is already widened enough I suppose I can just use the tap to rebore the hole to accept the helicoil without drilling first. Or would that be wrong? Also, the little tab needs to be broken off but I don't want any metal shards of any kind falling into the bolt hole - so what's the best way to prevent that?
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post #2 of 8 Old 02-14-2019, 02:26 PM
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Iíve always just drilled and tapped a bigger hole with a bigger bolt through the muffler. Check YouTube about the helicoil


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post #3 of 8 Old 02-14-2019, 02:51 PM
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First the hole must be drilled to the proper oversize dimension to accept the helicoil. When inserting the helicoil turn it in reverse first and you should feel it fall into place and then slowly insert it about 1 thread below the surface. You might be able to break off the tab with needlenose pliers if you can find a pair of those small enough. They do make tangless or tabless helicoils but that uses a separate tool for insertion.

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post #4 of 8 Old 02-14-2019, 03:11 PM Thread Starter
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Thanks guys!
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post #5 of 8 Old 02-14-2019, 03:19 PM
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Quote:
Originally Posted by Dannoman View Post
I am about to put a helicoil in one of the bolt holes for the muffler. If the hole is already widened enough I suppose I can just use the tap to rebore the hole to accept the helicoil without drilling first. Or would that be wrong? Also, the little tab needs to be broken off but I don't want any metal shards of any kind falling into the bolt hole - so what's the best way to prevent that?
You could use compressed air to clean out the hole or use a small magnet.
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post #6 of 8 Old 02-14-2019, 03:38 PM
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I'll agree, YOU MUST drill the hole using the correct size drill bit for the size helicoil you are going to use, 5/16" bolt most likely.

There are 3 or 4 similar systems to helicoil but different on the market. Some like the others better.

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post #7 of 8 Old 02-15-2019, 09:56 AM
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Be careful of the depth you drill your hole, you can puncture a passage behind the bolt in some engines. What I've used is a proper drill then switch to a end mill bit to flatten out the bottom.
The other thing is to be sure to keep the hole centered or you'll have issues bolting up the muffler.

Last edited by HCBPH; 02-15-2019 at 01:38 PM.
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post #8 of 8 Old 02-15-2019, 10:52 AM
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