<VV> engine noise

[J R Read_HML]

Lonny,

You had the head off.  Was the valve seat intact but loose OR were there 
chunks missing?  From your description, I'm picturing that it was intact. 
The smiley face it put on the top of the piston is likely of no concern 
(near the center of the piston) other than to smooth the edges a bit to help 
prevent a future hot spot there.  But, if the seat broke into pieces - those 
chunks can float through the intake to the other two cylinders on that side. 
So, if that was your situation, I hope that you also inspected the other 
piston tops.  If there was a lot of shrapnel, it can actually push the top 
of the piston down onto the ring area and prevent the top ring from moving 
(as it should) on any (or all) of the three AND will possibly also score the 
cylinder walls.  Please don't ask how I know these things.

Anyway, after scaring you, I'm inclined to believe as others have motioned, 
that a stud somehow got screwed into the block a tad too far during 
re-assembly.  A stethoscope (AKA - chunk of garden hose) might (or not) help 
give a clue as to where the sound emanates from.  Since another thread is 
about movies - see "Mr. Holland's Opus" for the diagnostic technique.

Later, JR
Past, present and future posts to Virtual Vairs by this writer are for the
private use of Virtual Vair members only.  Reproduction, including
archiving, outside of the Virtual Vairs is specifically prohibited.  This
prohibition includes any portions of this writer's message which may
have been included in a response message by another VV member.

----- Original Message ----- 
From: "Lonny Clark" <lclarkpdx at gmail.com>
To: <VirtualVairs at corvair.org>
Sent: Monday, September 11, 2006 6:39 PM
Subject: <VV> engine noise


> received the advice that I had lost a valve seat.

, and pulled the head. Sure enough, ex. seat on #2 was popped out. I
> took the head in, had it welded up, and a new seat and valve installed.
 The bad news: There's still a really nasty knock or clang.
> It's rythmic, sounds like one sound per revolution. I can't tell where 
> it's
> coming from, but sounds like it's internal. How do I find this one?