[DeTomaso] Where to buy a single Keith Black KB148 piston

[Charles McCall]

Hi Rolf

You probably don't want to hear this, but I second the opinion of those who
recommend changing all the pistons. If one was affected, then perhaps others
have been damaged. 

This comes from someone who tried changing a single valve spring that broke.
I was stranded on the highway when a second one, obviously weakened, broke a
few weeks later. I ended up completely rebuilding the engine (um, more than
once) because I tried taking the quick way out and only replaced the
component that showed obvious wear. The remaining components had been
subjected to the same conditions and had the same age, which meant that I
spent time on the shoulder waiting for a towtruck and lived through a
certain amount of frustration until I threw in the towel and started from
scratch. 

Just something to keep in mind. Perhaps you'll be fine just changing one
piston. Or you'll get to know the towtruck drivers on a first-name basis... 

Charles McCall
1985 DeTomaso Pantera GT5-S #9375
"Raising Pantera Awareness Across Europe"
http://www.poca.com/index.php/gallery/?g2_itemId=2323
-----Mensaje original-----
De: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] En
nombre de Rolf Poulsen
Enviado el: lunes, 20 de abril de 2009 22:11
Para: oldwheel at mts.net; detomaso at realbig.com
Asunto: Re: [DeTomaso] Where to buy a single Keith Black KB148 piston


Hi Barry 

 

I still have the engine in the car - my mechanic is pretty sure he can
change it without taking the engine out of the car. 

I have read about the large ring gap. I do not think that this is the
problem. The engine have driven 14.000 miles according to previous owner.
And if the ring gab was incorrect it would probably have happent earlier. 

 

from the kb website:
"Excessive spark advance, lean fuel mixture or too much compression for the
fuel and cam used will make heat sufficient to butt piston rings with as
much as .060" ring end gap. The entire top land can expand enough to contact
the cylinder walls, when close to melt down temperatures are reached"

 

I think this was the problem as the previous owner had changed the timing
just before shipping the car. And because I didnt hear any pinging I thought
that it wouldn't be a problem to take the car for a spin. But I guess I was
wrong :(

 

Rolf. 
 
> From: oldwheel at mts.net
> To: detomaso at realbig.com; rolf_poulsen at hotmail.com
> Subject: [DeTomaso] Where to buy a single Keith Black KB148 piston
> Date: Mon, 20 Apr 2009 14:23:26 -0500
> 
> Rolf
> I just bought a set of eight of these KB148 pistons for $207 from Summit.
> You may want to have a look at the rest of yours before you go paying a
> premium and shipping for just one piston. If the engine is out of the car,
> it looks like a set of new rings for all eight may be a good idea while
it's
> easy? Make sure the top ring gaps are at least 0.026 inch in every
cylinder,
> regardless of whether you use old rings or new ones. The damage in your
> photo is typical of a top ring gap that's too small. These KB pistons MUST
> have a larger gap than old style pistons. Their instructions are very
clear
> about that. 0.026 inch gap is absolute MINIMUM for a 4 inch bore KB
piston.
> 
> Barry
> 
>
----------------------------------------------------------------------------
> ----
> 
> 
> Rolf Poulsen rolf_poulsen at hotmail.com
> Mon Apr 20 13:45:43 CDT 2009
> 
> 
> 
> I have had a little trouble with my engine (see picture)
>
http://i178.photobucket.com/albums/w241/royaldo/pantera%20stempel/IMG_1277.j
> pg
> 
> I'm from Denmark and there aren't many auto shops with part for an old
> cleveland.
> Anyone who knows if it is possible to buy one piston and not a set of 8.
The
> engine is 0.40 over.
> 
> pawengineparts.com do not have any in stock and do not order less than 8.
> 
> http://www.sdparts.com do not have any in stock and will have to check if
he
> can order one at a time.
> 
> 
> Any help would be much appreciated
> 
> Rolf.
> 

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