<VV> follow up to no compression in cylinder #3

[Harry Yarnell]

This sounds like a broken piston. I've seen this, maybe half a dozen times; 
always late models. Break is at the oil ring groove, but almost always 
there's one hell of a racket, as the lower and upper piston halves beat 
against each other. Theory is use of the wrong octane fuel causing sever 
knock.

harry yarnell
poohbah of Perryman
perryman garage and orphanage
hyarnell1 at earthlink.net
----- Original Message ----- 
From: "Jedd Hebrink" <jhebrink at anvilcom.com>
To: <virtualvairs at corvair.org>
Sent: Monday, March 24, 2008 7:48 PM
Subject: <VV> follow up to no compression in cylinder #3


> Thanks to all who offered suggestions on my question regarding my 66 Monza
> 110 HP PG.  In the original post I lamented finding no compression in #3
> while the other 5 cylinders tested at 150 psi.  With the head off, I have
> discovered the problem, or at least gotten closer.  I pushed on the #3
> piston and it slid right back up the cylinder.  (The other pistons 
> remained
> motionless) There were signs of oil staining along the cylinder wall along
> the bottom.  I am not sure what broke.  Any suggestions?  Is it the rod or
> wrist pin?  I guess the only way to find out is to yank the cylinder off.
>
> I would value input and suggestions from the group.  Can I get away with
> just fixing the problem on #3, or do I need to tear down the entire engine
> and split the crankcase open?  If the rod is broken, I guess I have no
> choice but to open the crankcase.  Can I just replace the broken rod, or 
> do
> I need to replace all six?  What else should I consider replacing if I 
> want
> to keep this car running?
>
> Many thanks,
> Jedd (I see a long project ahead of me) Hebrink
>
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