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External
Since: Jun 12, 2005
Posts: 14
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(Msg. 1) Posted: Thu Jul 06, 2006 6:05 pm
Post subject: Spark plug removal - aluminum heads?
Imported from groups: alt>autos>4x4>chevy-trucks (more info?)
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External
Since: Sep 20, 2005
Posts: 1696
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(Msg. 2) Posted: Thu Jul 06, 2006 7:55 pm
Post subject: Re: Spark plug removal - aluminum heads? [Login to view extended thread Info.]
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On Thu, 06 Jul 2006 18:05:10 -0400, AJay wrote:
>When removing spark plugs from aluminum heads is it best for the heads
>to be cold or warmed up?
>
>-AJ
Remove warm if they are tuff to get out and when you install them warm
or cold, recheck them for tightness after a couple of heat and cool
cycles.
-----------------
The SnoMan
www.thesnoman.com |
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External
Since: Dec 09, 2003
Posts: 8
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(Msg. 3) Posted: Thu Jul 06, 2006 8:41 pm
Post subject: Re: Spark plug removal - aluminum heads? [Login to view extended thread Info.]
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External
Since: Jun 12, 2005
Posts: 14
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(Msg. 4) Posted: Thu Jul 06, 2006 9:06 pm
Post subject: Re: Spark plug removal - aluminum heads? [Login to view extended thread Info.]
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External
Since: Jan 27, 2006
Posts: 68
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(Msg. 5) Posted: Thu Jul 06, 2006 9:25 pm
Post subject: Re: Spark plug removal - aluminum heads? [Login to view extended thread Info.]
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On Thu, 06 Jul 2006 22:19:30 GMT, SnoMan wrote:
>On Thu, 06 Jul 2006 18:05:10 -0400, AJay wrote:
>
>>When removing spark plugs from aluminum heads is it best for the heads
>>to be cold or warmed up?
>>
>>-AJ
>
>Remove warm if they are tuff to get out and when you install them warm
>or cold, recheck them for tightness after a couple of heat and cool
>cycles.
>-----------------
>The SnoMan
>www.thesnoman.com
is it best to only mess with aluminum heads when cold?
same on intake... I've had the pleasure of pulling out some threads
on an aluminum intake one time when the engine was warm.
I felt the $$ floating away about the same time...
-----------
Elbert
ask.DeleteThis@me.com >> Stay informed about: Spark plug removal - aluminum heads? |
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External
Since: Sep 20, 2005
Posts: 1696
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(Msg. 6) Posted: Thu Jul 06, 2006 11:55 pm
Post subject: Re: Spark plug removal - aluminum heads? [Login to view extended thread Info.]
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On Thu, 06 Jul 2006 21:25:12 -0500, Elbert wrote:
>is it best to only mess with aluminum heads when cold?
Not really because aluminum expands fars the stell when heated so the
hole size will grow quicker than the plug does.. If you have had
problems with threads coming out it is because either there were to
loose and leakge burned and gummed up thread so they strip or they
were over tightened when they were installed.
-----------------
The SnoMan
www.thesnoman.com >> Stay informed about: Spark plug removal - aluminum heads? |
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External
Since: Apr 02, 2006
Posts: 5
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(Msg. 7) Posted: Fri Jul 07, 2006 4:37 am
Post subject: Re: Spark plug removal - aluminum heads? [Login to view extended thread Info.]
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External
Since: Oct 17, 2005
Posts: 21
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(Msg. 8) Posted: Fri Jul 07, 2006 6:51 am
Post subject: Re: Spark plug removal - aluminum heads? [Login to view extended thread Info.]
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External
Since: Sep 20, 2005
Posts: 1696
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(Msg. 9) Posted: Fri Jul 07, 2006 11:03 am
Post subject: Re: Spark plug removal - aluminum heads? [Login to view extended thread Info.]
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On Fri, 7 Jul 2006 06:51:21 -0400, "Bubba"
wrote:
>Agree with cold only. Be sure to put a dab of antiseize compound on the
>threads and be careful not to overtighten.
>
Hot or cold will work as for reasons stated earlier in thread. It is
important to recheck them for torque after a few heat/cool cycles
though.
-----------------
The SnoMan
www.thesnoman.com >> Stay informed about: Spark plug removal - aluminum heads? |
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External
Since: Sep 20, 2005
Posts: 1696
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(Msg. 10) Posted: Fri Jul 07, 2006 11:05 am
Post subject: Re: Spark plug removal - aluminum heads? [Login to view extended thread Info.]
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On Thu, 6 Jul 2006 20:41:39 -0600, "Chevguy"
wrote:
>The hole can "oval" if the head is hot with nothing in it.
I love this one. you are kinding right? If it was going to "oval" it
would if plug was in there or not. Aluminum is stable and predicable,
it just has a different expantion rate the steel/cast iron.
-----------------
The SnoMan
www.thesnoman.com >> Stay informed about: Spark plug removal - aluminum heads? |
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External
Since: Dec 03, 2004
Posts: 129
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(Msg. 11) Posted: Fri Jul 07, 2006 6:03 pm
Post subject: Re: Spark plug removal - aluminum heads? [Login to view extended thread Info.]
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"Shep" wrote in message
> Sno, not disagreeing here, but Ford specifically recommends not removing
the
> plugs on the 4.6 up modular engine unless cold.
Ditto with VW since at least the forties. Many people have removed plugs
from hot aluminum heads and lived to regret it.
Dave >> Stay informed about: Spark plug removal - aluminum heads? |
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External
Since: Jan 29, 2005
Posts: 4
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(Msg. 12) Posted: Fri Jul 07, 2006 8:55 pm
Post subject: Re: Spark plug removal - aluminum heads? [Login to view extended thread Info.]
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"AJay" wrote in message
> When removing spark plugs from aluminum heads is it best for the heads
> to be cold or warmed up?
>
> -AJ
I work for an aluminum cyl. head mfg, we recommend cold, warm if you
absolutely must( in a racing situation between rounds or heat races) be
SURE to use a good ANTI-SEIZE on the threads. >> Stay informed about: Spark plug removal - aluminum heads? |
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External
Since: Nov 06, 2004
Posts: 22
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(Msg. 13) Posted: Fri Jul 07, 2006 9:31 pm
Post subject: Re: Spark plug removal - aluminum heads? [Login to view extended thread Info.]
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On Fri, 7 Jul 2006 18:03:40 -0500, "Hairy" wrote:
>
>"Shep" wrote in message
>
>> Sno, not disagreeing here, but Ford specifically recommends not removing
>the
>> plugs on the 4.6 up modular engine unless cold.
>
>Ditto with VW since at least the forties. Many people have removed plugs
>from hot aluminum heads and lived to regret it.
>
>Dave
>
Same thing with Harley Davidson. Especially important if you have
had a Heli-coil repair to a plug hole. A hot plug will take the
Heli-coil out with it.
-
Regards
Gordie >> Stay informed about: Spark plug removal - aluminum heads? |
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External
Since: Dec 09, 2003
Posts: 8
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(Msg. 14) Posted: Fri Jul 07, 2006 10:42 pm
Post subject: Re: Spark plug removal - aluminum heads? [Login to view extended thread Info.]
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"SnoMan" wrote in message
> On Thu, 6 Jul 2006 20:41:39 -0600, "Chevguy"
> wrote:
>
>>The hole can "oval" if the head is hot with nothing in it.
>
>
> I love this one. you are kinding right? If it was going to "oval" it
> would if plug was in there or not. Aluminum is stable and predicable,
> it just has a different expantion rate the steel/cast iron.
> -----------------
> The SnoMan
> www.thesnoman.com
No I am not kidding. The chances of it actually happening are probably only
slight, but that is what they preach. The reason being that (as you have
already pointed out in previous posts) that aluminum expands at a different
rate than iron. An engine is assembled and torqued cold. As things heat up
the head has all kinds of push/pull stresses forced upon it. Which is fine,
the engineers have designed it to handle this. But when you take out one
simple spark plug, you have changed the structure. >> Stay informed about: Spark plug removal - aluminum heads? |
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External
Since: Sep 20, 2005
Posts: 1696
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(Msg. 15) Posted: Fri Jul 07, 2006 11:55 pm
Post subject: Re: Spark plug removal - aluminum heads? [Login to view extended thread Info.]
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On Fri, 07 Jul 2006 21:31:42 -0400, The Nolalu Barn Owl
<gordie@nolalu.on.ca>
wrote:
>Same thing with Harley Davidson. Especially important if you have
>had a Heli-coil repair to a plug hole. A hot plug will take the
>Heli-coil out with it.
That is because the aluminum block expands quicker and more than
insert which expands at same rate as plug. But if the helicoil is
sizeed propelry and inserted in head when it is hot so that it shrink
fits around helicoil, this will not happen. Blame this problem of the
individual installed the coil, not the head or its content. It is
still best to remove plug for a normal aluminum head will it is warm.
-----------------
The SnoMan
www.thesnoman.com >> Stay informed about: Spark plug removal - aluminum heads? |
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