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Old 05-11-2000, 02:18 PM   #1
Scooby Newbie
Member#: 1367
Join Date: Apr 2000
Chapter/Region: MWSOC
Location: Cleveland, OH, USA
2000 Impreza 2.5RS
Blue Ridge Pearl


Actually you want to do this when the engine is warm (doesn't have to be hot!) Metal expands when it is warm. The threads on the valve cover will expand more than the metal of the plug threads. Aluminum expands at a lower temp. This will make it easier to remove the spark plugs and you won't have to worry about stripping threads. Be sure to put anti-seize on the threads of the new plugs so it will be just as easy to remove them next time.
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Old 05-11-2000, 02:26 PM   #2
Scooby Newbie
Member#: 305
Join Date: Sep 1999
Location: PA, USA

How much anti sieze should one put? Enough to "wet" all the threads, or should there be a few blobs as well?

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Old 05-11-2000, 03:02 PM   #3
Scooby Newbie
Member#: 362
Join Date: Oct 1999
Chapter/Region: MWSOC
Location: Cincinnati, OH
2006 WRX STi
WRB / Gold


No blobs! Just wet the threads enough around the bottom so that it'll spread as you screw them in. Dielectric grease is also a good idea wherever the plug wires make contact (coil & plugs).
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Old 05-11-2000, 03:18 PM   #4
Scooby Guru
Member#: 329
Join Date: Sep 1999
Chapter/Region: Tri-State
Location: NJ
1995 325i
Arctic Gray


Don't do it when the engine is warm! When you torque the new plugs in to the proper setting, the engine block will shrink as it cools, thus increasing torque by an undeterminable amount. The torque specs are given for a cold engine.

The plugs aren't hard to unscrew when it's cold anyway.

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Old 05-12-2000, 01:34 AM   #5
Scooby Newbie
Member#: 305
Join Date: Sep 1999
Location: PA, USA
Post At what engine temp to change spark plugs??

Just curious as to what temp should the engine be at when you swap plugs. I recall it should be cold so you don't strip the aluminum threads. This is correct, no?

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Old 05-12-2000, 01:52 AM   #6
Scooby Newbie
Member#: 566
Join Date: Nov 1999
Location: Sussex, UK
1994 Legacy GTB


I would have thought it was sensible when cold so as to not burn your hands

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