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Is it always required to remove the engine to re-thread. a spark hole plug on a 1973 Super Beetle? Thanks.
 

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If you use a heli-coil kit a suggestion is remove valve cover to make sure neither valve is open , Pack some grease onto heli-coil tool and make sure that it goes straight into cylinder to catch aluminum chips I also would make sure that piston is at Bottom Dead Center and if not 100% sure remove rocker arm assembly and use a screw driver into spark plug hole to make sure piston is at the bottom. KD Tools still makes the tool kits and inserts 14MM X 1/2 inch . A lot of time a 14MM spark plug chaser will work unless sparkplug blew out with metal on it
 

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67 Bug. 2275cc, 10.1:1, 48IDA,Eagle2242Cam,2300Lb clutch, 3.85 diff. Lowered,roll bar, 5pt, swaybars
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It is also good practice to use a "never seize" lube on spark plug threads to prevent steel plugs from sticking to the aluminum/magnesium threads in the VW heads. I have done this for nearly 1000 tuneups across all kinds of engines and never had a spark plug pull out any threads.
 
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