Helicoil for spark plug repair

[Mark_Skyland]

Just wondering how many people have had success using a helicoil type of repair on a chainsaw plug thread?

 

 

Ive used then on larger machines without problem but ive heard they arent the best solution and that something like a time sert should be used instead.

 

I think also on an old 026 but I cant remember tbh:laugh1:

 

I've given one a go (helicoil) today on a T540xp after one of the lads thought it best to insert the plug from the off with a combi spanner because it was too hot! Lucky it was our saw and not a customers as a new pot would have been on order!

 

I will be giving it a good testing before its put to use again up a tree.

[adw]

Have done many heli coils, the key is to get a genuine heli coil tool, not these cheap re coil tools, you must also get the tap dead straight, hold the tap in a pillar drill and turn by hand to keep the tap straight, never turn the tool backwards, use a tag break off tool. If fitted correctly they are stronger than the original thread.

[Mark Bolam]

I'm pretty sure I screwed the thread in my 540 while taking the plug out multiple times to sort out an oiling problem.

It's been a temperamental pos since.

 

 

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[spudulike]

Used both helicoil and inserts, good results on both but the quality and straightness of the new cut thread is important with both methods!

 

I posted pics on my "what's on your bench" thread if any one is interested!

[Tom D]

Time serts are great, but they aren't cheap

[MATTMOSS]

Helicoils are great, I've fixed loads of damaged threads with them, including spark plug holes. Depending on how badly they have been damaged I have also got away with cleaning them up with just the tap.

[NFG]

Hi

 

I have done a helicoil repair to an alloy car engine cylinder head some years ago, worked fine, can't see why it wouldnt work on a chainsaw head

 

 

N

[Old Mill Tree Care]

Spudulike has done it on my 395xp and it's been perfect since.

[spudulike]

Spudulike has done it on my 395xp and it's been perfect since.

 

That was a carbide steel one after the aluminium one popped but that was more to do with the receiving thread not being good.

[Mark Bolam]

What's the crack with a new plug?

Presumably the old one wouldn't fit?

 

 

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