I had a head in my basement that had the plugs in and some were very, very
hard to remove. I tried the penetrating oil method and it didn't work at all
and that's with the head propped up with the plug on the verticle. I flipped
the head over and tried from the combustion chamber. Nada, nothing. I used
some heat and they slowly came out. After I broke the plug loose a little I
put some penetrating oil in and it helped only a little.
Remember that the plug gasket is on the head and if it stops air from
leaking it'll definitely stop oil from penetrating.
I had the same problem with a steel head and used my impact gun to take the
plugs out. Although it seems brutal I thought it was better than using a
long breaker bar as the torque is being applied in line with the plug and
the hammering action definitely helps. They came out with no problem and no
damage.
FWIW,
Mike
----- Original Message -----
From: "matt12@mail.rcip.com" <matt12@tuna.rcip.com>
To: <datsun-roadsters@autox.team.net>
Sent: Wednesday, May 02, 2001 10:22 AM
Subject: RE: Re: How tight should a spark plug be?
> 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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