Bob doesn't emphasize it, but for those unfamiliar with the N9T, this is also one of the worst possible engines for this to happen in. The plugs are waaaay down in a hole, just tilted up about 15? degrees from horizontal. You can probably drill it using a right angle drill adaptor, but it seems risky since I don't know how you'd see what you're doing and you're trying to drill hard steel in preference to adjacent soft aluminum. Pulling the head off might be the best but very difficult choice.
Dave Towle
> From: "Bob Bruce" <bobbruce@mts.net>
> Subject: Re: 505 turbo - broken spark plug
>
> 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
>
>
>
>
>
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Received on Thu Apr 6 18:20:38 2006
