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??? ??? I had a store bought tool along those lines , I loaned it to a guy that took it with him when he moved . It had a micrometer body that threaded into the plug hole & a adjustable shaft

I have a spark plug tool that I made and I just used an old spark plug and cleaned the ceramic out of the middle. I then tapped the inside and put a bolt in with the head cut off and then the end

??? ??? ON small engines I have used a piece of rope through the plug hole so the piston will be stopped & then loosed the crank bolt . Up until recently the availability of impact guns on some

??? ??? Yep , My 1940 IH tractor is the same & some old Harleys use a rather large thread spark plug . ??? ??? animal

In my 55+ years as a mechanic I have never heard of that. I always used an impact gun and never had one that wouldn't come. Nick

Having said that most modern spark plugs are 14 and 18mm, that was not always the case. Back in the model T days there were common spark plugs with 1/2" pipe threads as well as 7/8" - 18 threads. As a

<eddie.draper@...> writes: Well, probably, but I wasn't fixing a cylinder head. I was making a spark plug plug tool. You take out the spark plug, insert the tool, and it

The threads if I remember right are 14mm for most and 18mm for Ford. I have been? a mechanic for about 55 years and have had the repair taps for spark plug holes about just as long. Nick

I also reverse under power without disengaging the half-nuts. But I power off after the pass, before backing out 200 on my cross-feed dial. Number 2 and 3 are backwards…lol Sometimes on the last

??? ??? Agree that their probably thread milled . Ive seen & own 1 or 2 sparkplug taps , but I've never seen a sparkplug die . Not that they don't exist just not in any of my tool boxes ???

I doubt whether spark plug manufacturers nowadays use dies, more likely thread milling or some such, but surely you can get the taps for cylinder head repairs? Eddie

"Andrei" <calciu1@...> writes: Did you know that spark plug threads are always metric? http://www.delorie.com/photos/southbend-lathe/img_3185.html That's a spark plug plug for servicing

Part 1:? you cut imperial threads with a metric leadscrew in just the same way as the opposite.? Easy if it is all covered by a built in qcb, but I suspect that if not, you would use a 120 / 127

All this discussion of metric threads has raised a question in my mind. Sorry for being simple, but the only metric threads I ever cut were small enough that they were done with a tap or a die, never

Thanks for the more accurate explanation Allen. This morning I have an M4-.9 thread to cut and I will possibly, even if egg-on-face happens. Honesttly I cut so many Metrics that I dont realize what I

"mike allen" <animal@...> writes: I didn't either. Getting the single speed motor (which was installed sometime around 1950) to run backwards was one of the challenges in adding metric to my

These may be in the files section. Please respect the copyright. They may help. Jim B, -- Jim B

A 10K you mean, not the 10L. allan

Maybe we miscommunicate, Ray, or maybe one of us is wrong. I would like to clear it up, just so that later readers of this thread don't get the wrong idea and scrap a part. So, let me try from

??? ??? Thank you sir ??? ??? animal