Corvair DiagramCorvair Photo
Corvair Center
home forum corvairs calendar links Corvair Podcast
California Corvairs
Clarks Corvair
Clarks Corvair
“Performance
“CORSA"



Chevy Corvair License Plate
Chevy Corvair Chrome Wheel
Corvair Center Forum :  Corvair Center Phorum The fastest message board... ever.
Corvair Center 
Any cylinder head experts..
Posted by: Grandpacorvair ()
Date: October 08, 2017 06:35PM

Putting aside my quest to eliminate my elusive ticking valve noise..

Way back when this all began, the first thing I found was #6 exhaust valves rocker was sitting on it's valve stem off center and tipped to the right. Also the rocker stud was slightly scored by the bottom side of the rocker. Pulling the rocker revealed that the valve guide was worn on the same angle. In the end the guide was also bad, Believing that the worn valve was causing the tipped rocker I pulled the head and sent it off to the rebuilder. When it came back I also replaced the rocker, guide plate, push rod and later, the lifter. The rebuilder replaced all of the valve guides, #6 valve and its seat.

Unfortunately the rocker still sits off center AND is still tipped. When you first adjust the valve for zero lash the rocker sits properly, however when you add 1/4 to 3/4 turns the rocker moves off center and tips.

We've made some measurements as much as we can and valve angles (with respect to the head) seem well within specs.All the other valves seem fine.

So I guess my question is, what is causing this and how is it fixed? Now, I know Corvair valves don't always sit exactly on the center of the valve stem, but in this case it seems that whatever is causing this is enough to eventually damage the valve stem top and rocker stud.

Kerry Borgne
Birmingham, Michigan

1963 Spyder Convertible



Edited 1 time(s). Last edit at 10/08/2017 06:38PM by Grandpacorvair.

Attachments:


Options: ReplyQuote
Re: Any cylinder head experts..
Posted by: 63turbo ()
Date: October 08, 2017 07:58PM

Probably, the stud hole is off center. The only thing that can reasonably be
done about it (short of finding another head) is to re-locate the pushrod guide
slot. One way might be to heat the guide plate slot and bend it to the spot that will aim the rocker more to the center of the valve. The other way would be to cut that guide slot off and figure out how to mount a guide slot in the proper location... I think some of the earlier corvair heads actually had guide
slots bolt on separately, but the boss in the head where that bolt went is still present. It may be a 1960 only feature though... One of my old Clymer
Corvair manuals shows this odd bolt on guide plate.

Edit: I looked at your picture again, and it does seem to look like one of the stud holes is kind of in a odd spot relative to the others.

------------------------------------

Kevin Nash
Friday Harbor Washington
63 Spyder, Daily driver, EFI read about my project here: [corvaircenter.com]
first test start on EFI here:[www.youtube.com]
first official EFI boost test here:[www.youtube.com]
engine less 62 Spyder
Canadian 64 Monza Parts car






Edited 1 time(s). Last edit at 10/08/2017 08:01PM by 63turbo.

Options: ReplyQuote
Re: Any cylinder head experts..
Posted by: 63turbo ()
Date: October 08, 2017 08:31PM

I checked my manual and I misremembered what I thought I saw... some of the older pushrod guide plates have a single bolt in the center, but are still retained with rocker arm studs, like all the others, and do not come off separately, and there is no boss on the later heads to put that bolt hole in
like I thought... sorry.

------------------------------------

Kevin Nash
Friday Harbor Washington
63 Spyder, Daily driver, EFI read about my project here: [corvaircenter.com]
first test start on EFI here:[www.youtube.com]
first official EFI boost test here:[www.youtube.com]
engine less 62 Spyder
Canadian 64 Monza Parts car



Options: ReplyQuote
Re: Any cylinder head experts..
Posted by: Chilly Willy ()
Date: October 09, 2017 04:27AM

You should get an adjustable pushrod to get the correct measurement.
However, Looking at the pic of the combustion chamber, that is a sick engine. I wonder if number 6 is getting hot and passing oil. It looks like the lifter collapsing and hammering the valve.



Will
Northern California

Options: ReplyQuote
Re: Any cylinder head experts..
Posted by: Grandpacorvair ()
Date: October 09, 2017 04:43AM

#6 also had a bad head gasket that was replaced when the head was rebuilt.

Kerry Borgne
Birmingham, Michigan

1963 Spyder Convertible

Options: ReplyQuote
Re: Any cylinder head experts..
Posted by: vairmech ()
Date: October 09, 2017 04:46AM

Stop on by, only about 45 minutes away! Bring ALL of the parts.

You already know the cam is bad along with the lifters.

Bring the engine over to my place, you can work on it under my supervision.

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com



Edited 1 time(s). Last edit at 10/09/2017 04:48AM by vairmech.

Options: ReplyQuote
Re: Any cylinder head experts..
Posted by: moomba32 ()
Date: October 09, 2017 07:40AM

vairmech Wrote:
-------------------------------------------------------
> Stop on by, only about 45 minutes away! Bring ALL
> of the parts.
>
> You already know the cam is bad along with the
> lifters.
>
> Bring the engine over to my place, you can work on
> it under my supervision.

Can't beat that offer. I read in a different thread that someone wants out because things like this don't happen, looks like they still do. Thanks Ken.

Don Marlowe
66 Monza 2Dr 140/pg
64 Spyder convertible now, 110/pg
Eutawville SC

Options: ReplyQuote
Re: Any cylinder head experts..
Posted by: cepak ()
Date: October 09, 2017 07:47AM

Not Ken Hand's labor rates, but still funny.


Tom Cepak
Fort Worth, TX

Attachments:
Options: ReplyQuote
Re: Any cylinder head experts..
Posted by: jbyenko77 ()
Date: October 09, 2017 10:42AM

sometimes you can use a roller rocker and shift the shaft over to center the roller on the valve stem

jeff ballard
camarillo,CA

Options: ReplyQuote
Re: Any cylinder head experts..
Posted by: Timothy Shortle ()
Date: October 09, 2017 11:25AM

That is a MOST GENEROUS offer from Ken. Hey Ken, does that apply to all of us? If "yes", expect a line of Corvairs from probably all 50 states.

Options: ReplyQuote
Re: Any cylinder head experts..
Posted by: Wagon Master ()
Date: October 09, 2017 11:55AM

I'm headed his way in a couple weeks.
Git in line!tongue sticking out smiley


'64 Monza Coupe 140 4 speed
'61 700 Lakewood 95 4 speed
'69 Monza Convert. 140 Auto.

Been aircooled since 1973
Northwest Ohio

Options: ReplyQuote
Re: Any cylinder head experts..
Posted by: Nickshu ()
Date: October 09, 2017 12:06PM

Ken built my heads. Those are definitely not his rates grinning smiley. Not many mechanics have his understanding of machine work. I'd jump on this opportunity if I were you.

Nick
_______________________________________________________________________
1964 Monza Spyder Convertible #435 - Rotisserie restored - Check out my restoration thread here: [corvaircenter.com]
Recreational Mechanic/CORSA Member/US Navy Veteran
Other cars: 2003 Porsche 996 Carrera 2; Boring daily drivers; 2005 Lotus Elise supercharged (SOLD); 1982 Porsche 911SC (SOLD)
Northern Colorado, USA

Options: ReplyQuote
Re: Any cylinder head experts..
Posted by: vairmech ()
Date: October 09, 2017 05:51PM

I'm willing to help anyone but I do have to make a living and of course anything I do there will need to be some compensation.

The labor rate sign is so true! And yes I have done that simply because I had to UNDO everything that was done the first time.

Thanks Nick.

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

Options: ReplyQuote
Re: Any cylinder head experts..
Posted by: Chilly Willy ()
Date: October 10, 2017 06:41AM

That’s a solid offer from ken.

From the pics(not including the tilt or side alignment) the valve geometry is off. That and reduced oil pressure to the lifter and flow through the push rod will cause failure to the stem tip. Seems you have a deeper problem and the engine needs to come apart.



Will
Northern California

Options: ReplyQuote
Re: Any cylinder head experts..
Posted by: BobV66Vair ()
Date: October 10, 2017 10:22AM

Aren't the slots in the guides angled? I seem to recall that if you put them in upside down, the slots are offset improperly. Other than that, RUN to Ken's with your engine.

Bob Vinnacombe
Sandy, Oregon
1965 Corsa 140 stock
1966 Monza Soon to be race car
1968 Monza Parts for now

Options: ReplyQuote
Re: Any cylinder head experts..
Posted by: Wrencher ()
Date: October 10, 2017 08:26PM

My bos from 35 years ago had a bunch of funny signs, but my favorite was:

"Our mechanism are fluent in the following subjects:

Fishing
hunting
wives
sex
drinking
the weather
hot rods
any other questions that pop up.

Talk to them as long as you wish, YOU are paying for their time!"

Hans

The Larry Shinoda Collection: '65 Corvair Monza 140, '69 L-68 Corvette Roadster, '70 BOSS 302

Options: ReplyQuote
Re: Any cylinder head experts..
Posted by: 65CrownV8 ()
Date: October 12, 2017 07:02AM

Bob, I believe you’re confusing valve guides with pushrods guide plates.

George Jones - East Orlando, FL
'65 Monza V8 Convertible - 355/4-spd Posi
'66 Monza Coupe - 95/PG
'67 Monza Coupe 140/4-spd/Posi, A/C
COrvaiR Society of America (CORSA), Central Florida Corvair Club, Tidewater Corvair Club, V8 Registry

Options: ReplyQuote
Re: Any cylinder head experts..
Posted by: roger65180 ()
Date: October 14, 2017 02:09PM

I have alinged my rocker arms by taking both studs and guide plate to my 6 in vise clamp the lower part of the studs with the guide plate in place heat the center of the guide plate dull red bend the one that is off it has worked for me with my roller rockers and i run that motor hard

Roger R
Madison Wi
62 ct pg turbo
65intercooled 180 4sp,autocrosser
62 Rampy

Options: ReplyQuote


Sorry, only registered users may post in this forum.
This forum powered by Phorum.