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Old 01-10-2018, 01:03 PM   #1
1930artdeco
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Default quick 3X plug question

Hi All,

I just installed, but can uninstall if need be, some new 3x plugs. The washer that came with them is concaved. I installed them so the washer would flatten out when tightened. Is this correct?

Mike
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Old 01-10-2018, 01:31 PM   #2
1930-Pickup
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Default Re: quick 3X plug question

The gasket will take the shape of the head/plug interface, which in this case should be flat. You should be fine, but retorque them after a few miles just to be sure.
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Old 01-10-2018, 02:56 PM   #3
BILL WILLIAMSON
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Default Re: quick 3X plug question

"Rule of thumb" for plug torque is 25 Ft Lbs.
Bills' Specs
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Old 01-11-2018, 10:31 AM   #4
burner31
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Default Re: quick 3X plug question

So...

1: Concave up, flat down
or
2. Concave down, flat up

Feedback?
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Old 01-12-2018, 10:34 AM   #5
katy
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Default Re: quick 3X plug question

Quote:
Originally Posted by 1930artdeco View Post
Hi All,

I just installed, but can uninstall if need be, some new 3x plugs. The washer that came with them is concaved. I installed them so the washer would flatten out when tightened. Is this correct?

Mike
Either way should be OK.
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Old 01-13-2018, 10:00 AM   #6
burner31
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Default Re: quick 3X plug question

Answer to post #4 is:

2. Concave down, flat up
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Old 01-14-2018, 07:37 AM   #7
BILL WILLIAMSON
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Default Re: quick 3X plug question

UNIFORM Torueing is MOST important, since plug HEAT is dissipated through the threads & gasket contact area. Make sure the head surface doesn't have paint build up.
Bill W.
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