Was wondering how tight spark plugs have to be when they go in, never done it before. Just wondering if I can guage it by hand or if I need to buy a torque wrench.
Cheers
spark plug tightness
Mar 11, 2007
3 Replies
depends on the plug design how tight, plugs with a washer (new) wind in by hand only till the washer touches, then turn a further quarter to a half turn (should feel firm)
if they are taper seat plugs with no washer then again wind in by hand till the seat touches then do up a further eighth turn maximum.
it is very rare to see anyone use a torque wrench on plugs, if you have no feel then get and use a torque wrench, the setting for your car will be in the manual for it.
12ft/lb as a rule of thumb which equates to "just nicely nipped up" using a 3/8 ratchet.
15 ft lbs will be about right for most cars.
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