Need advice on spark plug repair kit to buy?

[twinstaged]

I just checked mcmaster and they skip over 17mm. Not a common fastener size and very fine for something that size.

 

[twinstaged]

Can you send a picture of the clearance?

 

[twinstaged]

eBay does have the tap though

 

[Mattyo]

....would love to see the clearance issue...

 

[Mattyo]

might actually be cheapest to grind off the tip and just get another save a thread tap.....rather than get a new 17mm tap....

 

[Lone Wolf]

....would love to see the clearance issue...

Got any 200T cylinders in your shop? Believe me its way to long .

 

[Lone Wolf]

This tap has a 14 mm starter thread then goes to 17 that's why its too long.

 

[Lone Wolf]

This is what they have http://www.autozone.com/test-scan-a...ad-spark-plug-thread-repair-system/141511_0_0

Here is the tap Matt

 

[Mattyo]

.... hmm...I was GONNA type no...

but I got a couple cruddy ones...

 

[Mattyo]

just tapped it with the save a thread.... it sorta clears...sorta not.

 

[Lone Wolf]

Retired machinist told me to get someone with a Bridgeport machine to bore and tap it so it is perfectly straight.

 

[Lone Wolf]

just tapped it with the save a thread.... it sorta clears...sorta not.

Which sends it off center!

 

[Mattyo]

 

[Mattyo]

I don't think its sending it off center... I think the tap is digging into the top of the combustion chamber....by the time it digs in, the tap has a pretty good grip at the 17mm threads... ....i'm gonna play with this a bit....

 

[Mattyo]

and I have my folks bridgeport that i can use... how in the world would I mount the cylinder head so its straight? you'd have to somehow line it up first, then tap...but lining it up would be nearly impossible, especially if the threads were buggard in the first place

 

[Lone Wolf]

and I have my folks bridgeport that i can use... how in the world would I mount the cylinder head so its straight? you'd have to somehow line it up first, then tap...but lining it up would be nearly impossible, especially if the threads were buggard in the first place

Hell if I know but that is what i was told and he is good.

 

[Lone Wolf]

I don't think its sending it off center... I think the tap is digging into the top of the combustion chamber....by the time it digs in, the tap has a pretty good grip at the 17mm threads... ....i'm gonna play with this a bit....

When it hits the hemi shaped head it moves it off center.

 

[Mattyo]

 

[Lone Wolf]

View attachment 83011

what size tap and that is hitting Im trying to use a 17mm

 

[Mattyo]