<VV> Diagnose engine "knock" ? valve seat damage

[Mark Durham]

MIke is right, should have mentioned that if you have 0 compression that
usually is a stuck or burned valve or piston/ring damage.
Since you have the head off, lock down the cylinders by putting some tight
fitting hose on the head studs and pull the other plugs and pull the engine
through so you can see the condition of the cylinder walls, one at a time.
Compare them. . Wear will show up more at the top where there may be a
difference between where the rings run and at the top where they don't.
Clean that with some crocus cloth to get any carbon off and see if there is
a ridge there. Look closely at the three piston heads. You had one with no
compression, two with compression. Look for deep vertical scratches in the
cylinder wall (broken ring) damage to the head, difference in the coloring,
amount of carbon?

Also a cylinder using oil will usually coke up on the valve stems and back
of the valves. I would think the cylinder with low compression would have
more, as it probably has been using more oil longer, but if the engine is
old, all three (six) would be that way.
Got a digital camera? Take a picture and post it for us.
Off to build shelves in my daughters garage.

Mark Durham

On Sat, Oct 16, 2010 at 10:30 AM, Michael Kovacs <kovacsmj at sbcglobal.net>wrote:

> Charlie,
>  You need a valve remover tool. Just keep track of which valve goes where.
> Don't
> loose the keepers. A smack with a mallet will sometimes loosen up on the
> keepers
> that wont let go of.  You can check the valve looseness by just pushing the
> valve back into the guide. It may take a good machine shop to really check
> this
> condition. Hope you just need a valve seat cleaning and a regrind.
>
> You can check for valve leakage by reinserting both valves in the head and
> adding some light oil like kerosene to the head to see where any potential
> leakage is. O in # 3? I cant see why.
>
>  Hope others will add to this basic stuff. Where do you live? Any
> experienced
> corvair people near you?MIKE KOVACS
>
>
>
>
> ----- Original Message ----
> From: Charles Lee <Chaz at ProperProper.com>
> To: shortle <shortle556 at earthlink.net>; virtualvairs at corvair.org
> Sent: Sat, October 16, 2010 1:35:34 AM
> Subject: Re: <VV> Diagnose engine "knock" ? valve seat damage
>
> Wow !  I would have bet that # 3 would have an obvious indication of valve
> seat damage, but it does not show any valve seat displacement ?
>
> www.yourbuyersinn.com/Cars/Corvair/1967MonzaCylinderHeadRemoval.htm#CombustionChambers
>
>
> I'm still convinced that #3 vale seat was the cause of my "knocking" when
> the engine wasn't even warm enough to do that ?
> Would the area around the valve be worn if the seat was loose ?
>
> The combustion chamber is wet though and the top of # 1 and # 5 are chock
> full of carbon, probably from messing with the carburetors, trying to get
> them right.
>
> Any ideas ?  I've never removed valves before, so what do I need to know
> that will surprise me if I try this ?
>
> Thanks again guys !
> Charlie
>
>
>
> ----- Original Message -----
> From: "shortle" <shortle556 at earthlink.net>
> To: "Charles Lee" <Chaz at ProperProper.com>; <virtualvairs at corvair.org>
> Sent: Friday, October 15, 2010 5:41 AM
> Subject: Re: <VV> Diagnose engine "knock" ?
>
>
> > Odds: Even money. Did you have good compression in all 6 cylinders before
> > you replaced the parking brake cable?
> > Timothy Shortle in Durango Colorado
> >
> >
> > -----Original Message-----
> >>From: Charles Lee <Chaz at ProperProper.com>
> >>Sent: Oct 15, 2010 12:43 AM
> >>To: virtualvairs at corvair.org
> >>Subject: <VV> Diagnose engine "knock" ?
> >>
> >>What are the odds that I'll find a dislodged valve seat on #3 ?
> >>
> >>Charlie
> >>
>
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