<VV> 66 Monza 110 PG engine - sounds like big problems

[Jedd Hebrink]

 Thanks to all for the suggestions.  Please keep them coming.
Tonight I checked all the plugs, and they were all secure.  I checked the
compression in each cylinder and here is what I found:
# 1 150psi, #3 120, #5 135, #2 120, #4 135, #6 135.  If I dropped a valve
seat, would the compression fall off dramatically?
Thanks,
Jedd


-----Original Message-----
From: Spencer Shepard [mailto:sshepard3 at earthlink.net] 
Sent: Wednesday, August 27, 2008 12:31 PM
To: 'Jedd Hebrink'
Subject: RE: <VV> 66 Monza 110 PG engine - sounds like big problems

Jedd,

Any experienced mechanic should be able to tell you if the noise is in the
lower end (crank, pistons etc.) or in the valve train. Also if there is a
dead (no compression) cylinder.

Did you notice if any valve required a lot of adjustment? A dropped valve
seat is the most likely culprit, it fits your scenario since the engine was
hot and cooled down suddenly (don't ask me how I know). The bearings or
piston aren't likely.

Try a compression test. Hopefully they are all OK.

Spence shepard

-----Original Message-----
From: virtualvairs-bounces at corvair.org
[mailto:virtualvairs-bounces at corvair.org] On Behalf Of Jedd Hebrink
Sent: Wednesday, August 27, 2008 12:39 PM
To: virtualvairs at corvair.org
Subject: <VV> 66 Monza 110 PG engine - sounds like big problems

Many thanks to all on VV that have given me so much helpful advice while I
rebuilt my daughter's 66 Monza 110 PG.  I thought I was finally finished,
after the usual roller coaster of excitement, followed by the disappointment
of discovering a new problem, followed by relief that the problem wasn't
really so great and you all offered easy instructions to fix it.
 
Here is the latest;  Last weekend, after following the recommended break in
procedures and several satisfactory local test drives (probably had about an
hour and half total driving time racked up), I set out to drive the car to
my daughter's place about an hour away.  All was well as I clipped along at
55 mph for about 45 minutes.  After pulling away from the first stop sign on
my route (45 minutes into the trip) I heard a noticeable knock and noted
significant loss of power.  I pulled into a parking lot and shut it off.
Checked the oil - it was at the full level.   Towed the car back to my shop.
 
Last night, I adjusted the valve train, and I am quite certain it is not
valve clatter.  I fear something more serious; perhaps a rod or crank
bearing.  It is difficult to describe the noise in words, but I am quite
sure it is originating from within the crankcase.  It is not noticeable at
idle, but becomes apparent as I increase rpms.  I have not tried to drive it
since the weekend, but am pretty sure it would increase under load.
 
Any ideas what I may be looking at?  Also, any chance I can repair this
problem without removing the engine and transmission form the car again?
What diagnostic steps would you recommend I take to to narrow the problem?
 
Thanks for being patient with me.  I have worked on many cars over the
years, but I am still a newbie when it comes to Corvairs.
 
Jedd (trying to keep my chin up) Hebrink Austin, Texas area

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