<VV> Piston removal

[Frank DuVal]

The few pistons I installed myself were done at room temperature. The 
machine shops use a rod heater to heat the rod before installing the 
pin/piston assembly.

I found a washer with an i.d.  larger than  the piston pin o.d. and cut 
a slot in it so it could be removed after installation. The thickness of 
the washer was also chosen as the gap I wanted between the rod and the 
piston. This way I could place the washer between the piston and rod, 
press the pin home against a flat surface and the rod/piston alignment 
would be OK without pressing very slowly and measuring the gaps.  
Confused?  Measure all the gaps on a removed piston/pin/rod assembly 
before dissassembly to see what I mean. I also used rear axle lube for 
the assembly lube.

I use sockets as press adapters all the time. Many brands give lots of 
incremental sizes on o.d.

Frank DuVal

Sethracer at aol.com wrote:

> 
>In a message dated 2/17/2007 1:02:24 PM Pacific Standard Time,  
>bryan at skiblack.com writes:
>
>So, I  have a bunch of rods and pistons, and I'd like to remove the old  
>pistons.  I see there's a special guide tool in the shop manual to  use 
>with a press, but I have no idea where to get one.  Any  suggestions?  
>I'm further guessing that heating the assembly would be  a good idea for 
>either removing or  installing.
>
>--Bryan
>
>
>
>
>If you are just removing the pins to use the rods and toss the pistons, You  
>don't need to heat them. I have done this. Heating the rods and cooling the  
>pins might be appropriate for installation.  I does depend on how tight the  
>original press fit was. But remember the rod and the pin are both steel, and  
>will expand at the same rate when heated. It might be a looser fit on the  
>piston, (aluminum will expand more) but it should be a loose fit on there right  
>now. Just put a good support under the piston and press the pin out. I use a  
>tall HD socket of the correct size diameter (slightly smaller than the pin) Some 
> may be tight on the rod. That is the bang you will hear when they "give up". 
> Also, if one refuses to move and the pressure builds up, move to the side 
>and  stay out of the line of fire. - Seth 
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