Fixing a Helicoil

[brapperdoodle]

I need some creative ideas! Ive got the tray open on my Krash and im about ready to close it up. The pump "inserts" are just blocks of aluminum and the PO had the front 2 pump holes Helicoiled. These helicoils are only in the top half of the threads, driven in much too far and need to be properly replaced. The rear 2 holes are really junky threads but have not been tampered with. The only thing I have found that can replace an existing helicoil is a "Big-Sert" That is an oversized Timesert but they are not offered in a Stainless option. My other idea was to use some new OEM Yamaha pump inserts. Drill the holes out of the aluminum blocks, so the new inserts can drop through and be held from above. I even wondered if I could incorporate them into the tray (like an FX-1) and have them removable from the top deck underneath the turf. Anyways, I need to fix the front 2 poorly helicoiled inserts... What would you do?

I can post pictures if needed

 

[Jyzmbe]

Why not use a pick and needle nose and remove the helicoil and replace it with a new one at the depth you want? If it’s fine but just deeper than you want can you not just use a longer bolt?


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[brapperdoodle]

Why not use a pick and needle nose and remove the helicoil and replace it with a new one at the depth you want? If it’s fine but just deeper than you want can you not just use a longer bolt?


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No, it extended past the threaded aluminum block. Only half of the helicoil was in the block, so a longer bolt wouldn't do anything. But you are right, maybe I can re-helicoil it if I can unwind the old one out of there.

 

[brapperdoodle]

 

[Jyzmbe]

If you can get ahold of it I think it will come right out. Just like a little spring. Might break a couple times but just be patient


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[beerdart]

The tang is still inplace use the install tool and thread it through.

 

[brapperdoodle]

You still think just another helicoil is the best replacement? Im not against it, but while im in here I want to make the best and most permanent repair possible!
Does anyone know the difference in thread pitch for an M10x1.25 helicoil vs timesert? I know they both use the same size drill bit for pre-install... This is for timesert...

 

[mikesx]

I need some creative ideas! Ive got the tray open on my Krash and im about ready to close it up. The pump "inserts" are just blocks of aluminum and the PO had the front 2 pump holes Helicoiled. These helicoils are only in the top half of the threads, driven in much too far and need to be properly replaced. The rear 2 holes are really junky threads but have not been tampered with. The only thing I have found that can replace an existing helicoil is a "Big-Sert" That is an oversized Timesert but they are not offered in a Stainless option. My other idea was to use some new OEM Yamaha pump inserts. Drill the holes out of the aluminum blocks, so the new inserts can drop through and be held from above. I even wondered if I could incorporate them into the tray (like an FX-1) and have them removable from the top deck underneath the turf. Anyways, I need to fix the front 2 poorly helicoiled inserts... What would you do?

I can post pictures if needed

What would I do? While the tray is open I’d grind that garbage out and epoxy in some naval brass chunks to use as inserts and be done with it once and for all.

 

[brapperdoodle]

What would I do? While the tray is open I’d grind that garbage out and epoxy in some naval brass chunks to use as inserts and be done with it once and for all.

Don't tempt me.. You know i'm easily influenced haha

 

[mikesx]

Don't tempt me.. You know i'm easily influenced haha

You’re there bro. Just do it. Or you’ll be kicking yourself later...

 

[Sparkplug]

Pull on the coil with a pair of pliers. It will uncoil right out of the hole. Happens often

3 or 4 threads is all you need on a stainless bolt for a jet ski hill. 4 threads on a m8 bolt can hold more clamping load than the fiberglass around the insert. I wouldn't touch that insert unless the insert itself is moving around.

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[generaldisarray]

Never used a time-sert, I would guess the external thread is the same pitch as the internal thread. Keenserts have mismatched threads but they have way more wall thickness.
You have to buy the correct tap with either one, either STi or whatever time-serts taps are called.

 

[WFO Speedracer]

Timeserts from my recolection are 2mm bigger outside thread than inside thread on a 64x cylinder you use 8mm x 1.25 timeserts to screw into the 10mm x 1.25 exhaust manifold holes, I hope this helps

 

[JetManiac]

Pull the old helicoil out, replace with a longer one, problem solved.

 

[bkspeedwerks]

never going to be easier to fix properly then now. if it was me id grind it out and glass in new inserts

 

[JetManiac]

Helicoil is as good or better than new if done correctly.

 

[Sanoman]

This is a great thread Brapp! Good exchange of thoughts.

 

[Sparkplug]

A stainless coil type thread repair. In aluminum. Is a stronger than factory threads. It will not fail in any way related to the threads.

If the insert is properly glued in. There is absolutely no benefit to doing a thread insert. Or cutting into the tray to add or remove anything. You could hold up a small pickup with a single m10 bolt and full thread engagement.

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[G-Body]

I would grab the helicoil by the tang, spin it out and replace it with another one that is threaded in to the proper depth. I would feel better by tearing the aluminum out and replacing it with brass, but functionally it would not be any better.