I agree with Todd with regards to the penetrating oil.
You also might try getting the engine up to normal running temperature before
attempting to remove the plugs. As aluminum expands at a faster rate than
steel, the plug hole should open up slightly more than the plug expands in it
thus making the plug a bit easier to remove without damage.
Matt
70 1600
Original Message:
-----------------
From: Todd Osborn trosborn@california.com
Date: Tue, 1 May 2001 21:20:57 -0700
To: datsun-roadsters@autox.team.net
Subject: Re: How tight should a spark plug be?
Tom,
Spark plugs should be torqued to 25 ft-lbs, however you can get some binding
between the aluminum head and steel spark plug that will make them difficult
to remove. Best to assemble with anti-seaze grease. Of course this doesn't
help you much at this point. Try spraying the plug with liquid wrench and
letting it soak overnight, may still take a fair bit of torque to break
loose. If it is hard to turn after about the intial quarter turn, spray on
some more oil and wait, otherwise you may get some galling which could
damage the head.
Todd Osborn
San Jose, CA
----- Original Message -----
From: "Tom Duffy" <tomuo@pacbell.net>
To: <datsun-roadsters@autox.team.net>
Sent: Monday, April 30, 2001 9:24 PM
Subject: How tight should a spark plug be?
> I'm trying to replace the plugs on my '68 1600, but a short try
> with a small T bar type spark wrench failed to budge #1. I'm
> wondering how much pressure I can put on them without
> damage occuring anywhere. Should I try spraying some WD40
> to soak into the threads area? What is your experience
> in removing old plugs?
> The Engine runs fine now, so I don't want to try anything
> that might put it out of commission for a while, seeing as
> it's my daily drive (CA, Bay Area).
>
> Thanks,
>
> Tom.
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