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Immovable spark plug

Engine/Gearbox questions and discussion
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Sailor
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Immovable spark plug

Post by Sailor » Fri Sep 11, 2020 2:21 pm

Does anyone have any tips on how to remove a spark plug that's so tight the ceramic (or worse) is at risk?
I've tried most things, including applying a bit more force than I'm happy with.
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Immovable spark plug

Post by Drax » Fri Sep 11, 2020 3:15 pm

drop oil down, leave it overnight, then tighten it first and then attempt to remove - maybe run the engine for 5 mins as heat will apparently help as well
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Immovable spark plug

Post by Scott560 » Fri Sep 11, 2020 3:38 pm

Id run it round the block to heat it up, remove the plug leads then dump some penetration spray down there whilst its hot/warm, and let it soak through as it cools down, then get my 3 foot breaker bar on it. Its not that you need 3 foot of leverage, but you will get better feel and control then trying to use an 8 inch ratchet...

If it wont budge after that - get an impact gun on it - if its rusted in the shock will help break off the rust without tearing the threads (or at least less likely to than removing with a ratchet or bar).
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Immovable spark plug

Post by ATR84 » Fri Sep 11, 2020 5:05 pm

This happened on my Lexus. As Scott mentioned my mechanic got a breaker bar on it but it was seriously tough! God knows why some people put them in so tight.

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