Over tight spark plugs 3.5V8

cappers · Sep 18, 2020

Got the MoT on Monday so put in a new dizzy cap, rotor arm and plugs (NGK BP6ES) as part of my mini service and check up.
Only 6 plugs replaced as #5 and #2 won't budge

I don't want to force them so added some penetrating fluid to the holes and will try again tomorrow.
Any other hints appreciated.
Thank you.

Colthebrummie · Sep 18, 2020

Try getting the engine up to operating temperature and then see if they undo.

Col

cappers · Sep 18, 2020

Colthebrummie said:
Try getting the engine up to operating temperature and then see if they undo.
Col

Without burning myself

Just about to collect grand daughter from school so may have a go after.
Cheers.

Ratae · Sep 18, 2020

Yep. Take it for a run & get it hot.

Shippers · Sep 18, 2020

Are they the correct plugs your removing...mine had long reach in by po and the last one had locked thread against head and snapped...had to take head off to remove...

cappers · Sep 18, 2020

Thanks for the replies. The two stuck plugs are out

Heat from a drive, release spray, a bit more force (I was rather gentle the first time) and appropriately timed swear words were needed. The new ones went in easily so no damaged threads

DanClarke · Sep 18, 2020

Last time that happened to me I took the cheaters option and used a rattle-gun to remove the stuck one(s) when my brute-force and ignorance on the plug-spanner was getting nowhere.
Came out easily, and no issues with the new plugs going in. I have no idea why they were in so tight, its not a cast-iron head after all.

cappers · Sep 18, 2020

Been told that I should put them back in with anti seize,
Any thoughts? Means taking them out again

Never used it on plugs before.

Henry_b · Sep 18, 2020

Don't tighten plugs into a hot engine, probably what the last chap did..

A dab of antiseize won't to much harm I suppose, don't slap it on though!

Ratae · Sep 18, 2020

capo said:
Been told that I should put them back in with anti seize,
Any thoughts? Means taking them out again Never used it on plugs before.

Neither have I, boats or cars.
NGK say don't on shiny plugs. http://www.jagrepair.com/images/AutoRepairPhotos/NGK_TB-0630111antisieze.pdf
Bosch don't seem happy about it either, saying if you do you need to drop the tightening torque by a considerable amount: https://www.boschsparkplugs.net/learning-center/article/524/plug-torque-settings

cappers · Sep 18, 2020

Henry_b said:
Don't tighten plugs into a hot engine, probably what the last chap did.......

By the time I had removed the two stubborn plugs the engine was slightly warm to touch but not hot so should be ok.

Over tight spark plugs 3.5V8

cappers

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Colthebrummie

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cappers

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Ratae

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Shippers

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cappers

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DanClarke

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cappers

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Henry_b

Think outside, no box required.

Ratae

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cappers

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