I'd try the following:
Soak the thread with your favorite penetrant (I'm partial to Liquid Wrench)
but none I've run across are "miracle workers".
Use an easy-out.
How much spark plug metal exists? I'm talking thickness here.
K o l l
87S
- Original Message -----
From: "Steven Harris" <alternative7man@yahoo.com>
To: "Bob Bruce" <bobbruce@mts.net>; "Peugeot List"
<peugeot-L@yahoogroups.com>; "zn3j" <zn3j@yahoo.com>
Sent: Thursday, April 06, 2006 3:55 PM
Subject: Re: [Peugeot-L] 505 turbo - broken spark plug
I've never seen a plug come apart like that, but I know you don't want to
risk damaging the threads in your head. Can you see down there at all to
see if the remaining part of the plug could be threaded on the inside? If
you have a tap set, I would tru to thread the inside of the remaining plug
about half way and put a bolt in with locktite and then try to screw it on
out. You may want to tap onthe bold lightly as any vibration will help free
it, but not to hard as that can damage the threads. If you do have to
drill, see if you can find some kind of small magnet you can put down inside
to help remove any metal fragments (but don't lose the magnet inside) before
blowing out with air.
Steven
Bob Bruce <bobbruce@mts.net> wrote:
Wow
Do you have trouble!
For those of you who haven't seen the picture:
The plug has broken in 2 leaving the steel threads only in the head.
The insulator came out of the head along with the steel that forms the nut.
Let this be a lesson to all Peugeot owners about the importance
of anti seize on threads especially when it is steel into aluminum.
I assume that the threads are totally seized in the head and that this
is not the result of some other misadventure that caused the plug to break.
I have never seen this in 35 years of fixing Peugeots.
The worst part of doing this is that you can't see any of it.
I would be inclined to drill first as big as I could go so that you just
leave a spiral of threads in the head.
You could establish the maximum size of the bit by trying some bits
in an empty spark plug hole. You don't want to cut into the threads in the
head by more than .25 mm or .010"
It may be that the safest route is an adjustable reamer for the
final few thou
The inside dia. of the threads in the head will be considerably less than
1/2" so once you get close with a drill bit, the finale leaving just the
spiral of threads that you can pull out with a pick, can be done with an
adjustable reamer.
Caution is necessary every step of the way work up with the drill bits
taking out as little as possible. This will make for the easiest drilling
and be the easiest to keep the drill in line. Most sets run from 1/16 to
1/2" in 64 ths. of an inch.
The last thing you want is to have a large piece fall into the cylinder.
Small bits can be blown out by first cranking with the plug out
then running the engine on 3.
Bob Bruce
- Original Message -----
From: zn3j
To: peugeot-L@yahoogroups.com
Sent: Thursday, April 06, 2006 11:17 AM
Subject: [Peugeot-L] 505 turbo - broken spark plug
All,
One of the spark plugs in my 1988 505 turboSW broke while attempting to
remove it. What came out of the engine head is shown here:
http://autos.ph.groups.yahoo.com/group/peugeot-L/photos/browse/22de?c=
The bottom of the plug (threads) is still inside, flush with the head.
Any ideas on how to remove it? Anyone ever used the Easy-out tool for
this? Thanks.
Radu
Austin, TX
88 505 turbo SW 171,000 mi
88 505 V6 STX, 170,000 mi
Recommended format for your email subject lines:
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Received on Thu Apr 6 16:14:06 2006
