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Cylinder spark plug repair - timeserts

Black Dog Chainsaw

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Ok guys I have been in the research mode for a while on a insert that will actually work on saws. I have had to many helicoils look and feel good until I take the spark plug out a year later and the helicoil is on the spark plug. WTF???

Helicoils work good for things that don't need routine maintenance. So spark plug fixes with Helicoils is out.

Timeserts are solid and cold rolled not to mention proper loctite being used. I have been attempting to figure out how to piece together a "timesert" kit so that it doesn't cost $140-$200 to fix cylinder threads using the timeserts.

I will be back later with what I have found out and cut the research time down for others. I will warn that even a pieces together kit will be $80+. However, I will be on call for anyone needing a stripped spark plug repair in the future. Price for repair yet to be determined but these timeserts are the shiz.
 

Black Dog Chainsaw

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Mandatory picture.

32506ba044701935892f090dbb831407.jpg
 

Magnumitis

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Weld and retap on high compression cylinders
 

drf256

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I bought the brand name Helicoil kit specifically for plug repair. The last step was epoxy and crimping the outer flange with the provided tool. Worked perfectly fine and cost around $35 on Amazon.
 

Black Dog Chainsaw

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Helicoils: I have hammered the *s-word out of them on the last step to lock them in and used loctite and they still come out. Helicoils work based on the fact they push the coil outward when plug is threaded in but there isn't a real good locking mech designed into them to keep them in place when removing the plug later.

I used a timesert kit on my triton v10 and was impressed with with how they are designed to work. And I haven't had one problem with them so far.
 

tickbitintn

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timesert kits work well, helicoils work good and hold well when using a lock agent.
i would use the timesert style in a hole for the firing pin....
i have a napa insert in one but have not used it yet....
the weld and retap is the best repair , aside from cost.....
that said the napa is the "best bang for the buck" IMO
 

Cobby08

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I was super impressed with the timesert. Besides the price...
 

tickbitintn

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The initial price of the timesert kit is quite high, the refill kits of inserts are a little more reasonable.
If you were to use a lot of them they are worth it in the long run.


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Cobby08

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This driver I would say is the only real "custom" tool. All the rest are normal drill bits, taps, and countersink.
 
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Cobby08

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I have tried over tightening it and abusing it and it seems to be holding out very well. I recommend absolutely.
 

tickbitintn

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The tap is a "special" pitch / size that is unique to each specific timesert size... IIRC
Same with the helicoil taps...

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Cobby08

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Ah, my apologies I was thinking the tap was a traditional size for the spark plug.
 

psuiewalsh

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For the driver I have used a cap screw that is short enough to pass through the insert. When it is run through it expands the insert. I also use red Loctite since I can.
 

Ebels hardware

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I hate the solid Helicoils but I Love the stainless spring type Helicoils I have not had a failure in 25 years

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