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Heil coil spark plug threads A&P advice

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Nevill8415

Nevill
Joined
Mar 11, 2017
Messages
24
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4
Location
Clare Michigan
Doing annual on My 73 Cherokee 6 260. Pulled plugs for compression check And #3 bottom plug comes out with a surprise, Heilcoil. Having owned the plane 8+ years never noticed the repair. Then noticed it had been leaking exhaust around it. I’m confident that it was leaking a very short time as I checked the engine often for leaks as it had leaking exhaust gaskets when I purchased the plane .
Researching repair I find Lycoming has approved Heilcoil that are oversized and serrated. The inserts are very reasonable priced but the installation tools are over $1800 for the kit.
Anybody rent tools or some ideas on repair, Thanks in advance
 

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