How tight should I do the spark plug?

humanbeing · 01-13-2016, 09:07 PM

Denso https://translate.google.com/transla...ic%2Ftorque%2F | https://www.denso.com/global/en/prod.../basic/torque/
New: 1/3 turn (120°) | Used: 1/12 turn (30°)
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NGK https://translate.google.com/transla...c%2F04_01.html
New: 1/2 turn (180°) | Used: 1/12 turn (30°)
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Torch http://www.chinasparkplug.com/part.asp?keyno=362
New: 3/8 turn (135°) | Used: 1/12 turn (30°)

SpudRider · 01-13-2016, 10:51 PM

Thanks for posting the good information, HB.

humanbeing · 01-14-2016, 04:48 AM

btw. What's the "generic guide" (ie. w/o torque wrench) similar to above for US brands (AC Delco/ Champion...) ?

jct842 · 01-14-2016, 11:10 AM

All I have ever done is gone snug and just a hair more as you can feel the copper crushing. A fellow in the late 50's showed me. You only need a wrench with a couple inch handle to put a plug in. I cringe when I see some one with a 1/2" full sized ratchet cranking a plug down.

Adjuster · 01-14-2016, 02:08 PM

I am an expert at stripping spark plugs in aluminum heads. I put a steel insert in my current engine and so far it appears to be rock solid, it was an excellent upgrade.

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FastDoc · 01-14-2016, 02:41 PM

Hold the wrench with the edge of your fist touching the extension. Using only wrist strength make it tight. Holding the wrench this way will limit the torque you can apply to maybe 10 foot/pounds and you won't overtighten.

Only once have I had a plug back out. That was on a Ford Probe GT Turbo (never should have sold that car...). Overtightening can cause some more serious damage.

01-13-2016, 09:07 PM	#1
humanbeing Join Date: Mar 2008 Posts: 2,436	How tight should I do the spark plug? Denso https://translate.google.com/transla...ic%2Ftorque%2F \| https://www.denso.com/global/en/prod.../basic/torque/ New: 1/3 turn (120°) \| Used: 1/12 turn (30°) === NGK https://translate.google.com/transla...c%2F04_01.html New: 1/2 turn (180°) \| Used: 1/12 turn (30°) === Torch http://www.chinasparkplug.com/part.asp?keyno=362 New: 3/8 turn (135°) \| Used: 1/12 turn (30°) __________________ Last edited by humanbeing; 02-01-2019 at 05:03 PM.
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01-13-2016, 10:51 PM	#2
SpudRider Join Date: Jul 2008 Location: Idaho Posts: 25,054	Thanks for posting the good information, HB. __________________ Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894
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01-14-2016, 04:48 AM	#3
humanbeing Join Date: Mar 2008 Posts: 2,436	btw. What's the "generic guide" (ie. w/o torque wrench) similar to above for US brands (AC Delco/ Champion...) ? __________________
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01-14-2016, 02:41 PM	#6
FastDoc Join Date: Mar 2009 Location: Southeastern Washington desert Posts: 14,761	Hold the wrench with the edge of your fist touching the extension. Using only wrist strength make it tight. Holding the wrench this way will limit the torque you can apply to maybe 10 foot/pounds and you won't overtighten. Only once have I had a plug back out. That was on a Ford Probe GT Turbo (never should have sold that car...). Overtightening can cause some more serious damage. __________________ Happy to serve.
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01-14-2016, 11:10 AM	#4
jct842 Join Date: Jan 2015 Location: arkansas Posts: 297	All I have ever done is gone snug and just a hair more as you can feel the copper crushing. A fellow in the late 50's showed me. You only need a wrench with a couple inch handle to put a plug in. I cringe when I see some one with a 1/2" full sized ratchet cranking a plug down.
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01-14-2016, 02:08 PM	#5
Adjuster Join Date: Dec 2014 Location: Deerfield Beach FL Posts: 1,410	I am an expert at stripping spark plugs in aluminum heads. I put a steel insert in my current engine and so far it appears to be rock solid, it was an excellent upgrade. /
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