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> Longevity/reliability of a "sleeved" helicoil timesert spark plug hole
nditiz1
post Jan 21 2025, 06:08 PM
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I recently acquired a 912e aka 2.0 Ljet. I was told it was running up until the point the 912e was disassembled. I find it very hard to believe when spark plug #4 hole does not thread a m14 spark plug. I will check an m16 bolt tomorrow when the hardware store opens as that is close to what I get with a micrometer. Now the hole is threaded. If I can get a m16 -> m14 reducer how well will it hold up? Should I only use a helicoil or even a timesert? OR if it does accept m16, get a studebaker m16 spark plug and gap accordingly?
Thanks all!

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Chad911sc
post Jan 28 2025, 04:14 PM
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When I presently pulled my 2.0 apart, all 4 spark plug holes were cracked on both sides. They were also cracked where the cylinders meet the head….straight to the trash.
Remember these are 50 years old now.
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