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Discussion Starter · #1 ·
I stripped the threads for the spark plug on head cover. Can I tap a new thread a little bigger and still be able to fit a different (bigger) size plug in there??? or should I just look to buy a new head for engine??
 
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I would try a heli-coil first before I bought a different head. I used one on a car I had back in high school and it never gave me any problems.
 

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Just buy a thread insert from the hardware store and you can use the tap set you already have. Put some locking compound on there and you will be good to go. I wouldnt listen to the stig. He only drives
 

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Stewart said:
Hydriv said:
See your local NAPA dealer. Take him the head and the spark plug. He will have a Heli-coil kit to sell you. OR.. buy a used one off of e-Bay.
I'm not sure I'd bother with a used Heli-coil. :sidelaugh: :sidelaugh: :sidelaugh:
Why not???? Do they wear out???? :sidelaugh: :sidelaugh: :sidelaugh: :sidelaugh:

Ok..... I meant "used head" ...... not "used helicoil". I had that coming.... :lol: :lol: :lol:
 

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I have the tap and Helicoils for 14 MM spark plugs. The tap self centers in the original threads and then leads the Helicoil tap size into the hole as the tap is turned, no tap drilling required. This tap can only be used in aluminum cylinder heads. I do not loan this tool out but anyone may send me the cylinder head and I will do the job and send the head back to you. Let me know.
Bob MacGregor in CT
 

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I just uploaded two pics in my album of the 14MM Heli-Coil repair tool kit. The bottom tool is the coil inserting tool, the bent handle tool is for repositioning the Helicoil before the tang is broken off and the self centering tap. These Helicoils are available at most any good auto parts store. The coils come in different lengths, the ones pictured are 3/4" in length. I have had this tool kit since the 70s. There are several copys out now. these coils must be correctly positioned in the newly tapped hole.
Bob MacGregor in CT :mrgreen: :mowlawn:
 

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Discussion Starter · #10 ·
Bob

Thanks for the pics now I know what to look and ask for at NAPA, I went to Advance Auto tonight and they did not have heli coil set in that size they ony had smaller sizes. Thanks for the offer to do the cylinder head, If the cost for you to repair along with the shipping is cheaper than the tool I may take you up on that offer. How much for the heli coil tap threads and your time to do it?? Off to NAPA this weekend to check out the costs for kit, and there is the post office on the way home for me to pick up sipping box to send head to Conn. (just in case)
 

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If you have a power equipment dealer or outboard motor dealer nearby that has a quality service department either should be able to install a Helicoil or similar into you cylinder head. The patents that Heli-coil had expired some years ago so now there are other makers of coils and inserts and these are the types most likeky to be found in auto parts stores that are likely to carry them.
If you strike out let me know, I will install a Heli-coil for no charge and you pay for round trip shipping.
Bob MacGregor in CT :mrgreen: :mowlawn:
 
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