<VV> Will my newfangled 'ring compressor' contraption work ?

[Jim Houston]

Will only be EXACTLY the right size if the sacrificed cylinder has the 
same bore as the others...  if target cylinder is standard, and the 
"tool" comes from a .060 cylinder, might not work because it won't 
compress the rings enough...  or am I thinking funny??

Jim Houston

On 11/16/2010 9:31 PM, Charles Lee wrote:
> Yes, agreed, as nearly everyone pointed out !  That's the way I was doing it
> in 'practice' and it was a bear on the bench.
>
> The main point of this whole thread is the custom compression tool that I'm
> going to make as soon as I get an extra barrel to cut in pieces !
>
> Regardless of the way the piston is installed, I was really trying to see if
> this newfangled tool I want to make is of any use :
> www.yourbuyersinn.com/Cars/Corvair/CorvairTools.htm
>
> It seems better that adjustable ring compression tools because it's EXACTLY
> the right size ?
> (I edited it  bit so if you already saw it, it may have changed ?)
>
> Thanks for all the insights (it's great learning at the hands of the patient
> folk on VV) !
> Charlie
>
>
> ----- Original Message -----
> From:<corvairduval at cox.net>
> To:<virtualvairs at corvair.org>
> Sent: Tuesday, November 16, 2010 3:50 PM
> Subject: Re:<VV>  Will my newfangled 'ring compressor' contraption work ?
>
>
> I also vote for "C", assemble the piston into the barrel and then the
> assembly is installed into the block, just like GM did it with cylinder
> assemblies.
>
> But...
>
> Suppose the engine is already assembled and you just take a head off and OH
> NO, a cylinder pulled off the piston, or you just want to remove the
> cylinder to install Helicoils in pulled studs...
>
> You need to use option "A". Use a "take apart" ring compressor.
>
> I use a Lisle waffle style compressor that comes apart, 21700.
>
> http://www.lislecorp.com/divisions/products/?product=93
>
> It works either way the piston is going into the barrel.
>
> Your solution may work, except there is a lot of force on those rings you
> need to hold in with those two pieces of cast iron. How many hands do you
> have? Maybe a hose clamp to help? And, there is the missing metal from the
> two saw cuts, may be an issue, maybe not. The VW people have a solid
> tapered ring to install pistons into barrels to form the assembly to
> install into the engine. It is not a "take apart" style being a solid taper
> part.
>
> http://www.vwparts.net/JCRCOMP.html
>
> Anybody use the K-D Tools set that uses locking pliers and bands to
> compress rings? It is definately "take apart" style. Looks interesting and
> expensive...
>
> http://www.sjdiscounttools.com/kd850.html
>
>
>
> It seems you could mount the cylinder in a vise and use two screwdrivers to
> hold the rings in while pressing the piston in, but just try it by
> yourself! ggg
>
> I have used gear type hose clamps on small pistons. Just make sure the ring
> ends don't line up with non banded areas.
>
>
> Frank DuVal
>
>
>
> Original Message:
> -----------------
> From: Charles Lee Chaz at ProperProper.com
> Date: Tue, 16 Nov 2010 15:05:05 -0800
> To: virtualvairs at corvair.org
> Subject:<VV>  Will my newfangled 'ring compressor' contraption work ?
>
>
> I'm practicing using a 'ring compressor' and this thing is NOT easy !!!
>
> First question (Select correct answer) :
>
> A) The piston is installed onto the crank and the cylinder barrel slipped
> over it
> B) The cylinder barrel is installed into the crankcase and the piston is
> slipped into it
> C) Either (A) or (B)
>
> The problem with (A) is that the ring compressor may be too long to fit
> between the cylinder barrel and the crankcase, to slip the cylinder barrel
> over the installed piston, and the ring compressor would need to be
> disassembled after the piston is installed.
>
>
> (B) seems easier because you can see what you're doing better, and the ring
> compressor won't need to be disassembled after the piston is installed.
>
> I have a solution that may have been tried already ?
>
> Here's my idea (unless someone thought of this first ?)
> Cut about a 2" - 3" band off the 'bottom' of a cylinder barrel and cut that
> into 2 semi-circles.
>
> Use that contraption to squeeze the rings as the piston is installed using
> either method (A) or (B) above ?
>
> www.yourbuyersinn.com/Cars/Corvair/CorvairTools.htm
>
> Has anyone already tried this ?
>
> Charlie
>
>
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