Hammermechanicman
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I wish.
Spark Plug Thread Repair Kit Suggestions?
- Thread starter l008com
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- plug repair spark plug
Helicoil is the way to go, quick and easy, make sure to use loctite on the helicoil so it doesn't back out. I use to strip the threads on an old vw all the time then I found copper anti-seize.
The Runnings link looks like exactly what he needs. I see two problems: Running's only has stores in 12 states. They say it only includes the tap and four inserts, no tool to install nor drill bit. I think more research is needed. From another post maybe it uses a standard ½" drill bit. More importantly, specialized install tool was needed on Helicoils I've installed in the past.
I'm in the auto repair business not small engines. I can tell you 100% if you want a long lasting repair DO NOT USE A Heli-coil! if you have had this machine for 30 years your in it for the long haul and from the sounds of it you do preventive maintenance like changing a spark plug regularly. you may get 1 or 2 chances at it before the heli-coil pulls out of head. Time sert is the only way to go! unless you want to buy a cylinder,head and be done with it altogether. When you put the insert in the head red lock tite on the outside of the cert and you will be good for another 30 years!
golfergordy
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I used a helicoil thread repair kit I bought from aliexpress (for about $6), on a 9HP Craftsman snowblower. During the process of installing it I thought it would never work because it was very difficult to use the rethreading tool. I pounded it with a mini sledgehammer many times because it was so difficult to cut the new threads, and I thought that the new threads were stripped as I tried to cut them, but, when I finished, I inserted the spark plug with the helicoil and didn't tighten it too much. I started the engine and it ran fine. I wanted to use Loctite but thought the heat of the engine would be too much, so I didn't use any. I still need to test the engine again and run it for a long time to have more confidence in it.
Not about spark plugs, but if hole strips, check the hole for depth and see if there are enough threads further down the hole. Then use a longer screw or bolt but use one long enough to reach the bottom. Carefully shorten the bolt until it will torque without hitting the bottom. You need to use all the thread available. I have used this in carburetor screws and starter mounting bolts. Never had problems.
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Here is something we all should be aware of. A machinist friend tells me for a threaded hole to be at full strength the threads need to be 1.5 x the diameter of the screws. Well this makes these 9.5mm length 10mm plugs holes [2/3 strength] easily stripped and the 14mm short thread [45% strength] even easier to strip if over torqued. Now the 14mm long thread are at nearly 100%.
Which is not a Helicoil set but is an insert kit. Very similar to Timeserts
Now this is a Helicoil set that I was looking for. Too bad the company don't a have complete kit like it for the 14mm so I get the next level and getting the 9/16 bit separately. But at least they have the full kits for the 10mm & 12mm plus the extra Helicoil to refill the kits.
This is probably what you got.
Which is not a Helicoil set but is an insert kit. Very similar to Timeserts
Now this is a Helicoil set that I was looking for. Too bad the company don't a have complete kit like it for the 14mm so I get the next level and getting the 9/16 bit separately. But at least they have the full kits for the 10mm & 12mm plus the extra Helicoil to refill the kits.
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