Re: [Re: 505 turbo piston]

JJG (seachallenger@usa.net)
11 Nov 98 11:50:22 EST

Francios,
I know you dont want to here this but, George's observations, to me, is one
more reason to fully rebuild w/ forged pistons. I am guessing a similar
situation occured to your car. I am staring to feel that the pug pistons are
suspect. I know that in George's case below overboosting was occuring with
total disregard for air/fuel ratio and detonation and you would never let that
happen, but if the pistons were stressed enough to blow one of them, dont you
think the others were at least weakend.
JJG

peugeot-request@padui.org wrote:
> I was just looking at an 86 turbo at a local yard, gone were the head and

> driveshaft.

> I bought the turbo, manifold and oil line. I don`t need it, but just in case

> and it doesn`t take up a lot of room.

> The car was also missing piston and rod #4

> Once home I noticed the turbo is a Garrett factory overhauled unit with a

> p/n I didn`t recognize.

> I called Garrett and they said that is an oe p/n so that turbo was bought at

> the dealer(~$850). The turbo looked like new, even the link to the wastegate

> was not corroded.

> BUT when I tried actuating the WG flapper ( toilet seat) it was stuck. I had

> to tap it to loosen it. Considering that a friend has a turbo also with a

> sticking WG ( but he`s a mechanic so he lives with it and occasionally has

> to crawl under to loosen it up) I

> would not be surprised if that car had the turbo replaced then soon

> afterward the WG got stuck and the unwitting owner felt the extra power and

> thought it great and promptly blew a piston. Fed up, junked the car.

> BTW It might a last resort source for a piston, the top of the engine didn`t

> look good, lots of rust and crap.

> Moral is make sure the wg is absolutely free.

> George Nunez

>

> visit my cars and planes web site at:

> http://www.geocities.com/motorcity/track/4889/

> -----Original Message-----

> From: Francois Dion <francois@hyperreal.org>

> To: turbo@vectorbd.com <turbo@vectorbd.com>

> Date: Tuesday, November 10, 1998 5:11 PM

> Subject: 505 turbo piston

>

>

> >A while ago, I had put the 505 turbo aside. Lack of time,

> >lack of $ to do a proper job, lack of interest even.

> >

> >Actually, I was a bit overwhelmed. Then I followed

> >Ray's advice on removing the head, which I did. To give

> >me more working space I completely removed everything

> >around (intake manifold etc). At that point, I saw the

> >culprit: a damaged piston. I contacted a few people

> >to find a replacement piston and right now I'm waiting

> >on these people, hopefully yielding one piston in the

> >end (you know who you are :P ).

> >

> >Initially, I tought there was also head damage, but I

> >just checked it pretty good, and there doesn't seem

> >to be any. What had fooled me was the "folded" lip

> >of the piston. Pour oil, it goes down straight right there.

> >I tought it had been caused by an exhaust valve hitting

> >the piston, but now I think it just blew, from a previous

> >stress that had blew the head another time. Not that

> >surprising as the wastegate was in real bad shape.

> >The block is in very good shape, the other pistons

> >look real nice, so do the cylinder walls (including in

> >the one where the piston was damaged).

> >

> >So now, I have all the given in the equation, no real

> >unknown. Beside the piston, while I'm there should

> >I do anything else? (actually a shop not too far is

> >going to tow the car, change the piston and bring

> >back the car, I dont have anything to lift and support

> >the engine).

> >

> >I will have the head ported while I'm waiting for the

> >car. Anything else obvious that I should do?

> >

> >The Saab APC is also on the to do list.

> >

> >Now, I got to track down a piston, and all the

> >gaskets.

> >

> >Ciao,

> >Francois Dion (francois@hyperreal.org)

>

>

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