Re: [AMC-list] Engine rebuild

[Joe Fulton <piper_pa20@xxxxxxxxxxx>]

In my experience oversize pistons are marked on the piston top with the oversize dimension.  Clean the tops of the pistons well and look for 030.

Also, as you know a "gash" can become a stress riser and can lead to a break.  So I would be very cautions about using a damaged piston.  You might be able to polish or gently grind that area of the piston to reduce or eliminate the hazard, but I think I'd be looking for a new piston.

Joe

--- On Mon, 4/8/13, Thomas Garner <Tgarner@xxxxxxxxxxxxxx> wrote:

> From: Thomas Garner <Tgarner@xxxxxxxxxxxxxx>
> Subject: [AMC-list] Engine rebuild
> To: "AMC List" <amc-list@xxxxxxxxxxxx>
> Date: Monday, April 8, 2013, 3:47 PM
> Ok, I have torn down my engine and
> took some measurements. I"m getting a rebuild kit and I'm
> gonna replace everything. Camshaft, bearings rings, etc. I
> was a mechanic and Machinist in the Navy for 7 years, so I
> ain't scared, lol, but I've only rebuilt an engine once and
> I did it from advice the parts guy gave me and a Chilton
> manual. 
> 
>  I have a couple of questions though.
>  First, one of the pistons has a deep gash on the side of
> it. I know the rings ride the cylinder walls and I'm
> assuming the piston will not touch the walls so should I
> worry about this gash? I'd guess it's about a .050 gash. 
>  Second, other than that, all the pistons seem ok, so, if
> the gash doens't matter, should I still replace all the
> pistons?
> Third, all the cylinder bores are right at 3.780 but as
> per:
> http://www.null.cl/hornet/spec.html
> 
> the bore diameter should be 3.750 so my bore is .030 over,
> but when I inspect the pistons and rings, I can't find any
> indication that this is correct. I thought that the rings
> and/or the pistons would have .030 on it somewhere. Another
> oddity to me about this is the connecting rod has American
> Motors so I'm assuming it is OEM.
>  The rod and main bearings are .010 under. I measured with
> my calipers plus it has .010 on the block PLUS both the rod
> and the main bearings are stamped .010. Shouldn't the piston
> or the rings have .030 somewhere?
> 
> Any help would be appreciated.
> 
> 
> 
> Thank you,
> Thomas
> 
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