Spark Plug Question

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Jul 2, 2023 | 11:40 AM

#21

jim993

Drifting

Joined: Sep 2009

Posts: 1,862

Likes: 594

From: Prescott, Arizona

You do have to be sure to put anti-seize on the new plugs before installation. Not sure the original plugs were installed with anti-seize. My rule is to remove sparkplugs cold.

Jul 2, 2023 | 03:42 PM

#22

redzg

Safety Car

Joined: Mar 2017

Posts: 3,768

Likes: 940

From: Orlando Florida

Yes you should be concerned. Take a very careful look at the threads on the plug and make sure there isn't any aluminum adhering.
NGK is the only manufacturer where it's east to find, but Delco and Champion are also noted to recommend against applying an anti-seize to spark plug threads:
https://ngksparkplugs.com/en/resourc...ut-spark-plugs
It amazes me that we will spend money and time trying to find plug wires with as close to zero ohms as possible, then apply an indiscriminate insulator to the threads.

Jul 2, 2023 | 06:53 PM

#23

grinder11

Race Director

Joined: Oct 2004

Posts: 12,861

Likes: 4,664

Quote:

Originally Posted by jim993

You do have to be sure to put anti-seize on the new plugs before installation. Not sure the original plugs were installed with anti-seize. My rule is to remove sparkplugs cold.

Good point, jim993. When you remove a hot plug from a hot engine, you not only risk being burned, but the plug will reach ambient temp sooner than the engine, with the cold threads size slightly reduced, while the cylinder head threads remain hot (expanded). This increases the chances of a cross thread situation, especially with an aluminum head. Discovered this many years ago on motorcycle engines. Dont ask....

Jul 2, 2023 | 10:24 PM

#24

dinows33

Thread Starter

Burning Brakes

Joined: Mar 2006

Posts: 753

Likes: 241

From: New Hampshire

Has anyone ever had a plug break in half while trying to remove it ? I am concerned as the first and only one I removed really gave me some concern ??