advice - how far do I take this?

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Going4joe
Posts: 19
Joined: Thu Sep 08, 2016 12:37 am

advice - how far do I take this?

Unread post by Going4joe » Wed Mar 08, 2017 3:15 pm

Hi all,

I posted here months ago about my 65 Monza 110 hp. Bought car for $500. It had a loud knock (cylinder #5) in the engine when I got it. I had a machinist/mechanic who is excellent at his craft, rebuild the motor. He found that one of the bearings spun and the Piston arm was damaged. New piston arm, new rings, replaced everything except the pistons, which seemed to be in excellent shape. New lifters. Machined the crankshaft as well as there was slight damage to it from the thrown bearing. Heads redone. New seals of course throughout. Got it all back together, fired it up. Knock still there - cylinder #5. After weeks of trying to figure this out, we took engine out and took it apart again and determined the crank was machined incorrectly. We sent it back to that machinist and he admitted he made a mistake. Crank redone again and sent back. Engine went back together. (rebuilt the two carbs as well). FIred car up. Knock still there, but it sounded different, like it was in the valve area. But it was still in cylinder #5. Car was running really rough despite the knock. I mean rough, like way worse than after we rebuilt the motor the first time. Car sat for a month while I pondered what to do. I finally took it to someone else. This guy told me the distributor was the cause of the rough running of the motor. He pulled that out, it came out in pieces!! Got a rebuilt one and installed it today. Car running rough still. This new mechanic put a vacuum guage on motor. He said the vacuum is all over the place. He thinks both carbs are shot - like they cant be rebuilt. The throttle bodies are just shot. He also thinks the noise from the motor is the camshaft hitting a lifter. I have done nothing with the cam - my first mechanic told me the cam was fine. WHO DO I BELIEVE HERE? I have over $4000 into this car motor and Im going nowhere - literally. Im sure some of you can relate to this tale of whoa... But this car needs a new interior, paint, chrome etc - I havent even touched that fun stuff yet!! Any thoughts?

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County98
Posts: 279
Joined: Wed Mar 05, 2014 1:15 am
Location: Lawton, OK

Re: advice - how far do I take this?

Unread post by County98 » Thu Mar 09, 2017 5:15 am

I don't know man. Crappy deal. Hope you get it worked out though.

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Cheers!

-Shayne
Lawton, OK

'66 Corsa work in progress
viewtopic.php?f=52&t=8079

Jerry Whitt
Posts: 528
Joined: Thu Sep 26, 2013 2:42 pm

Re: advice - how far do I take this?

Unread post by Jerry Whitt » Thu Mar 09, 2017 10:55 am

You are experiencing a common issue. Lack of knowledge of older cars by the selected workers.

Solutions:

1. Go to your local junior college and sign up for an engine building class. The Corvair is pretty basic, and once knowledge is gained, you will feel good about doing your own work, and then be aware that some "experts" are not what they claim. The learning process is actually fun and you will meet some good people in class that will become friends for years.

2. Join a local Corvair group. Get to know the local Corvair people. Chances are excellent they will guide you to solutions to the problems you encounter
because they have already had similar issues. These folks will also become friends for years.
Jerry Whitt
ASE CERTIFIED MASTER TECHNICIAN
Retired
Hemet, Callifornia
65 Monza, purchased new
65 Corsa convertible

gnrand
Posts: 167
Joined: Sun Nov 15, 2015 8:10 am
Location: Wildomar,Ca

Re: advice - how far do I take this?

Unread post by gnrand » Sun Mar 12, 2017 7:05 pm

Man I really feel for you. I wonder if the cam was reinstalled correctly after the block was separated. Also when the engine was disassembled, did you replace the lifters or use the old ones. If the old lifters were used, they should be installed on the same camshaft lob it was running on.
Jeff
1965 140 Corsa
1968 140 Monza convertible 4 speed
1965 Corsa Convertible
1986 Buick GN V6 600hp

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Scott Howey
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Joined: Tue Nov 17, 2009 5:21 pm
Location: Hesperia, CA

Re: advice - how far do I take this?

Unread post by Scott Howey » Sun Mar 12, 2017 10:44 pm

Is the lifter stuck or collapsed cyl 5?
Scott

Going4joe
Posts: 19
Joined: Thu Sep 08, 2016 12:37 am

Re: advice - how far do I take this?

Unread post by Going4joe » Sun Mar 19, 2017 3:37 pm

Thank you for your responses. I believe cam was installed correctly but this new mechanic who jumped in recently and said distributor was bad - now thinks cam is bad and yes I do have brand new lifters in there on a used cam. I found out this is a no - no. New lifters should be put in w a new cam. Apparently this could be causing the noise


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Going4joe
Posts: 19
Joined: Thu Sep 08, 2016 12:37 am

Re: advice - how far do I take this?

Unread post by Going4joe » Sun Mar 19, 2017 3:39 pm

Scott - lifter is not stuck or collapsed in cyl 5. It's new. They are all new


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notched
Posts: 532
Joined: Wed Jul 25, 2012 8:13 pm
Location: Southern New Jersey

Re: advice - how far do I take this?

Unread post by notched » Sun Mar 19, 2017 3:56 pm

Did it spin the rod bearing again AFTER the initial rebuild? If so was it every determined what caused the rod bearing to spin in the first place? What were the clearances set to on the rods and mains during the rebuild? So of the Corvair blocks had machining issues in the grooves under the mains which could affect oiling to the rods. It pretty easy to see as sometimes the grooves are not lined up between the case halves or the grooves are not deep or wide enough.
Also as an FYI you must hook your vacuum gauge up to the vacuum crossover and not directly to the ports on the carburetors to get an accurate reading. Hooking to the carburetor ports will cause the gauge to bounce all over even on a perfectly running engine.
1966 Corsa turbo
1969 Monza convertible
1987 Buick Grand National

64powerglide
Posts: 1030
Joined: Tue Mar 25, 2014 9:18 pm
Location: Kalamazoo Mi..

Re: advice - how far do I take this?

Unread post by 64powerglide » Sun Mar 19, 2017 4:06 pm

Tell the guys why you say the knocking is coming from #5. Did you pull the # 5 spark plug & start the engine & still hear knocking?? Did you back off both rockers on # 5 until the valves didn't move & still hear knocking with the plug out??? Just grabbing at straws!!!!!! :doh:
64Powerglide, Jeff Phillips

Kalamazoo, Mi..

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