Spark Plug Stripped, Repair Stripped

Ando81

Ando81

ArboristSite Operative
Joined
Oct 16, 2018
Messages
247
Location
Australia
Hi all , I’m wondering if someone can help me with a Stihl 029 which has a stripped spark plug thread. It has had a dodgy repair done with a threaded sleeve put into the head and on the weekend I managed to strip the insert out of the head. My question is, am I able to put a bigger insert properly into the head and a helicoil inside of it to get me back to 14mm spark plug thread. It’ll basically have 2 thread repairs together, not ideal but basically my only option to get this old girl going again. I’d greatly appreciate any help. Thanks in advance, Justin
 
Ando81

Ando81

ArboristSite Operative
Joined
Oct 16, 2018
Messages
247
Location
Australia
Thanks for the input, I’ve used keysert inserts into aluminium for stripped rocker cover bolts with great success. I understand that changing the cylinder would be best but I was thinking that a genuine Stihl cylinder would be better quality than aftermarket. The machine shop idea sounds good, I’ll get some pics soon to decide it’s fate.
 
lone wolf

lone wolf

MS 200T King
Joined
Oct 5, 2009
Messages
60,740
Location
Prowling The Pine Barrens
Thanks for the input, I’ve used keysert inserts into aluminium for stripped rocker cover bolts with great success. I understand that changing the cylinder would be best but I was thinking that a genuine Stihl cylinder would be better quality than aftermarket. The machine shop idea sounds good, I’ll get some pics soon to decide it’s fate.
It may come down to price check the Machine shop price Versus new Cyl.
 
Huskybill

Huskybill

Addicted to ArboristSite
Joined
May 21, 2018
Messages
7,379
Location
Northeast
Oh no impact gun. I seen 18” 1/2” dr wratchet used on tranny drain plugs, the wrong direction, righty tightly, lefty loosely. I welded up the stripped hole and redrilled it for the kid.
 
Ando81

Ando81

ArboristSite Operative
Joined
Oct 16, 2018
Messages
247
Location
Australia
I’ve only pinched it up firm with a Stihl spark plug tool. When I looked closely at the spark plug I noticed that it looked crooked in the cylinder. Maybe the insert had been installed and cross threaded from the beginning.
 
Ando81

Ando81

ArboristSite Operative
Joined
Oct 16, 2018
Messages
247
Location
Australia
I’ve taken a couple of photos of the damaged thread. I’m assuming that it’s been drilled too big and tapped to 16x1.25 and the insert may not have gripped on much thread. I’m hoping a keysert insert will have more precise threads that can grab onto the alloy cylinder. I also found that it’s a Ms310 cylinder, Genuine Stihl.
d7bc616b6ba36b283ceb2eb4c493a246.jpg

560a78775350d9a684404aff6b19bb0f.jpg
 
Yukon Stihl

Yukon Stihl

Addicted to ArboristSite
Joined
Jan 26, 2011
Messages
1,181
Location
Yukon Canada
I saw a repair done by rocketnorton...
He took a bigger plug cut it off and tapped it for the small plug.Tapped the cylinder for the big plug and locktited it in.
Seeing it's a 029 that is what i would try if the hole is to big for any repair kits
 
HarleyT

HarleyT

A-Hole!!
Joined
Dec 6, 2014
Messages
18,861
I’ve taken a couple of photos of the damaged thread. I’m assuming that it’s been drilled too big and tapped to 16x1.25 and the insert may not have gripped on much thread. I’m hoping a keysert insert will have more precise threads that can grab onto the alloy cylinder. I also found that it’s a Ms310 cylinder, Genuine Stihl.
d7bc616b6ba36b283ceb2eb4c493a246.jpg

560a78775350d9a684404aff6b19bb0f.jpg
Wow! Get another cylinder!! Turn it into a ms390!!
 

Okie

Addicted to ArboristSite
Joined
Mar 7, 2015
Messages
1,478
Location
Oklahoma (USA)
I seen 18” 1/2” dr wratchet
This must be a tool from Elmer Fudd's tool box

The 18 inch breaker bar is what Wal-mart Bubbas use to install the oil filters and drain plugs in your vec after they have changed the oil and put in the WRONG OIL after a 3 hour wait for them to get er dun.
I've noticed these guys usually have 1/2 of their head shaved, lots of tatoos, and big ear and nose rings. Must be part of the job qualifications.

I'm now back to doing my own oil changes after having to repair stripped oil pan drain plugs and having to chisel off the oil filter ring.
Can you imagine having them Bubbas to these repairs that they screwed up in the first place????
 
Top