How to chase spark plug threads?
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Elder User
Joined: Jul 2005
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How to chase spark plug threads?
Pardon my ignorance, but I've never needed to use a thread chaser until now.
I picked up this tool today, to attempt to repair some spark plug threads. The chaser didn't come with any instructions. And I figure there's gotta be some experts on here.
How far into the spark plug hole is this little number intended to go -- how many rotations? I got about 4 full rotations in, and the resistance gets quite high. Am I supposed to push beyond this, and thread this thing all the way in?
I picked up this tool today, to attempt to repair some spark plug threads. The chaser didn't come with any instructions. And I figure there's gotta be some experts on here.
How far into the spark plug hole is this little number intended to go -- how many rotations? I got about 4 full rotations in, and the resistance gets quite high. Am I supposed to push beyond this, and thread this thing all the way in?
Senior User
Joined: Mar 2004
Posts: 133
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From: North Missouri
Make sure the valves are closed. They are at times in line with the spark plug hole. You can look down in with a light to make sure or use a bore scope. Should not be very hard to turn, you're only cleaning the threads not cutting new ones.
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Elder User
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I should clarify. I'm not asking (or proposing) about chasing threads as part of a routine plug change procedure. I had a plug eject (detailed in another thread) and I was attempting to possibly fix myself - at least fix enough to enable me to drive it to the shop with a plug in the empty hole.
The piston was down and valves closed. But...that shouldn't matter much - should it? When installing the Timesert, I totally see how having piston down and valves closed is critical. But for chasing threads, isn't there adequate clearance?
The piston was down and valves closed. But...that shouldn't matter much - should it? When installing the Timesert, I totally see how having piston down and valves closed is critical. But for chasing threads, isn't there adequate clearance?
Senior User
Joined: Mar 2004
Posts: 133
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From: North Missouri
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Cargo Master
Joined: Apr 2013
Posts: 3,087
Likes: 24
From: Central Florida
If you're able to go in four threads- then back it out and clean off any metal shavings and start over.
Go in 4.5 turns then back out a half. Then add 1 turn, then back out 1/2. then go in 1, then back out 1/2.
Slow and easy progress.
How far to go overall: I don't know.
Go in 4.5 turns then back out a half. Then add 1 turn, then back out 1/2. then go in 1, then back out 1/2.
Slow and easy progress.
How far to go overall: I don't know.
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