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Re: 1-2 Shift Fork issue
Posted by: playerpage ()
Date: May 17, 2020 09:46AM

You know, I had this happen to me in October. Everything fine, then suddenly I couldn't get into any gear at all (not so comforting at 65 mph!) but after I got stopped I COULD put it in gear as long as it was BEFORE the car was on, and afterwards I could only use 3-4 gears, not 1-2.

It turned out to be VERY simple. My linkage under the car had dropped its pin (I never had a good one anyway--just a nail) and was slipping when I shifted, even though it wasn't falling out. Curiously enough, by the time I found what had happened, the linkage had wound so tight that I had to use a clamp to open it up enough to drop the tip out. One it was out, and I made a few turns on the head/adjusted the clutch play properly, it shifted like butter!

I have no idea why the pin failing caused that to happen, but I put it all together, inserted a proper pin, and have been driving on it ever since.

____________________________________________

Eric C. Player, Porterville, CA, USA (Seriously! It's the USA out here!)
MEMBER: CORSA National, Central Coast CORSA, South Coast CORSA, Vintage CORSA, Sfba CORSA, and the San Joaquin Valley Corvair Club.
THEN:
1965 Monza 110, Canary Yellow
1965 Corsa 180 Turbo, Red
1966 Monza 110, Purple
1967 Monza 140, Red
1966 500 110, Black; nicknamed "Shadow"
1965 Monza 110, Camaro Yellow; nicknamed "Silver"
NOW:
1966 Corsa 180 Turbo, Blue; nicknamed "Bluvair"

"He cautioned me not to take notes. It would not have helped if I had, as he would start a paragraph with, 'It is therefore obvious. . .'
and go on from there to matters which may have been obvious to him and God but to no one else."
-- Robert A. Heinlein, character of Daniel B. Davis, 'The Door Into Summer.'

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Re: 1-2 Shift Fork issue
Posted by: diegocorsa ()
Date: May 17, 2020 02:36PM

My shift linkage pin was in and tight as I had to remove it when I pulled the powertrain.

-Cory
'66 Corsa
Nebraska

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Re: 1-2 Shift Fork issue
Posted by: TIBCO ()
Date: May 17, 2020 02:55PM

Cory, I think you've found your problem. It is in the clutch. I agree with Joel, the shift fork probably fell out when you pulled the cover off. They do it all the time. Wait until you try to put it back together and it falls out two or three more times. I use grease on the end that goes into the cover to help prevent the shift forks from falling out. It also helps if the transmission is upright and you are putting the cover on from the side.

I would put the transmission back together, making certain that both shift forks are installed properly and see how it shifts by sticking a small Phillip's screwdriver in the pin hole. If it shifts smoothly, I would take a long hard look at the clutch, flywheel and pressure plate.

Cliff Tibbitts
Lexington, KY
CORSA, CKCE
66 Monza, 140/4sp

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Re: 1-2 Shift Fork issue
Posted by: American Mel ()
Date: May 17, 2020 03:12PM

Will see what you find when this is all over, but I really think that Wagonmaster and I are correct.
I again suggest you go into that rear diff!

I can't help but feel the key is in these two sentences.

"I did loose loose the ability to shift unless I rev match or shut the car off and put into gear." So, it IS shifting.

"The strangest part of it all is when I was on the throttle in turns on the track it felt as if the clutch was slipping or the trans wasn't engaging until I was straight again."
That sure sounds like DIFFERENTIAL to me!

-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
WA. state, 1 mile south of the Canadian border,
I am not at the end of the world, but you can see it from here.
Have; '66 Monza Coupe - 140, 4-spd. Daily driver beater
'67 Monza Vert. - 140, 4-spd. Daily driver beater
'67 A/C Moredoor Monza
Have had; '61 Monza coupe, '62 Monza Wagon, '63 Spyder, '65 Corsa
.
non-vair
'04 Dodge Cummins Quad Dualy, approaching 400K
17'Terry

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Re: 1-2 Shift Fork issue
Posted by: diegocorsa ()
Date: May 17, 2020 03:16PM

I did go into the diff first thinking the same as you. Everything looks great and is tight as I just rebuilt the diff a year ago with a 4 spider posi carrier. What do you all think about the clutch disc dragging bad enough in turns causing it to slip??

-Cory
'66 Corsa
Nebraska

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Re: 1-2 Shift Fork issue
Posted by: American Mel ()
Date: May 17, 2020 03:50PM

After re-reviewing all that you have done, I think THAT is EXACTLY what your issue is!
Keep us posted.

-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
WA. state, 1 mile south of the Canadian border,
I am not at the end of the world, but you can see it from here.
Have; '66 Monza Coupe - 140, 4-spd. Daily driver beater
'67 Monza Vert. - 140, 4-spd. Daily driver beater
'67 A/C Moredoor Monza
Have had; '61 Monza coupe, '62 Monza Wagon, '63 Spyder, '65 Corsa
.
non-vair
'04 Dodge Cummins Quad Dualy, approaching 400K
17'Terry

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Re: 1-2 Shift Fork issue
Posted by: junkman ()
Date: May 17, 2020 03:52PM

I think that you need to take it apart. All we can do is guess, but you are the surgeon that needs to look inside the patient. The answer is in there, you just have to put on your Colombo outfit and do the detective work.

---------------------------------------------------------------------------------------------------------------
Woodstock CT... Located on the Connecticut / Massachusetts border, approximately 6 miles from the center of Southbridge MA. About 45 minutes from Hartford CT. 1 1/2 hours West of Boston MA. Woodstock CT to Los Angeles CA 2,937.1 miles. 1 Mile as the crow flies to Big Bird's nest.

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Re: 1-2 Shift Fork issue
Posted by: American Mel ()
Date: May 17, 2020 03:57PM

He did take it apart, and if you look at his pictures, that clutch definitely got HOT!
It didn't just FEEL like it was slipping.
It was for sure slipping.
I believe that he is correct in thinking that the bolt that backed-out prevented the clutch from fully grabbing, and allowed it to slip when encountering the extra force during the hard cornering of track driving.

-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
WA. state, 1 mile south of the Canadian border,
I am not at the end of the world, but you can see it from here.
Have; '66 Monza Coupe - 140, 4-spd. Daily driver beater
'67 Monza Vert. - 140, 4-spd. Daily driver beater
'67 A/C Moredoor Monza
Have had; '61 Monza coupe, '62 Monza Wagon, '63 Spyder, '65 Corsa
.
non-vair
'04 Dodge Cummins Quad Dualy, approaching 400K
17'Terry

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Re: 1-2 Shift Fork issue
Posted by: junkman ()
Date: May 17, 2020 04:06PM

I wasn't able to see the pictures..

---------------------------------------------------------------------------------------------------------------
Woodstock CT... Located on the Connecticut / Massachusetts border, approximately 6 miles from the center of Southbridge MA. About 45 minutes from Hartford CT. 1 1/2 hours West of Boston MA. Woodstock CT to Los Angeles CA 2,937.1 miles. 1 Mile as the crow flies to Big Bird's nest.

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Re: 1-2 Shift Fork issue
Posted by: American Mel ()
Date: May 17, 2020 04:33PM

Couldn't get all of it but here is a portion.
Hope you don't mind Cory.

-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
WA. state, 1 mile south of the Canadian border,
I am not at the end of the world, but you can see it from here.
Have; '66 Monza Coupe - 140, 4-spd. Daily driver beater
'67 Monza Vert. - 140, 4-spd. Daily driver beater
'67 A/C Moredoor Monza
Have had; '61 Monza coupe, '62 Monza Wagon, '63 Spyder, '65 Corsa
.
non-vair
'04 Dodge Cummins Quad Dualy, approaching 400K
17'Terry

Attachments:
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Re: 1-2 Shift Fork issue
Posted by: joelsplace ()
Date: May 17, 2020 05:11PM

What were the rivets on the disk hitting and why?

Joel
Northlake, TX
5 Ultravans, 114 Corvairs and counting...

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Re: 1-2 Shift Fork issue
Posted by: diegocorsa ()
Date: May 17, 2020 05:47PM

joelsplace Wrote:
-------------------------------------------------------
> What were the rivets on the disk hitting and why?


They were hitting the backed out flywheel bolt.

-Cory
'66 Corsa
Nebraska

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Re: 1-2 Shift Fork issue
Posted by: joelsplace ()
Date: May 17, 2020 06:33PM

That would explain having to synchronize the speed to get it to shift.

Joel
Northlake, TX
5 Ultravans, 114 Corvairs and counting...

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Re: 1-2 Shift Fork issue
Posted by: American Mel ()
Date: May 17, 2020 07:08PM

YES, and the noise!

-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
WA. state, 1 mile south of the Canadian border,
I am not at the end of the world, but you can see it from here.
Have; '66 Monza Coupe - 140, 4-spd. Daily driver beater
'67 Monza Vert. - 140, 4-spd. Daily driver beater
'67 A/C Moredoor Monza
Have had; '61 Monza coupe, '62 Monza Wagon, '63 Spyder, '65 Corsa
.
non-vair
'04 Dodge Cummins Quad Dualy, approaching 400K
17'Terry

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Re: 1-2 Shift Fork issue
Posted by: diegocorsa ()
Date: May 17, 2020 07:24PM

Hopefully I dodged an expensive bullet!!

-Cory
'66 Corsa
Nebraska

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Re: 1-2 Shift Fork issue
Posted by: vairmech ()
Date: May 18, 2020 09:50AM

alphasud Wrote:
-------------------------------------------------------
> I looked at your pictures. your 1-2 shift slider is gone! That’s why your fork popped out. Time to take it apart and pull the chunks out.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

I know I'm coming into this a little late but I don't see anything wrong with the trans. Especially the 1-2 slider, it looks like everything is where it should be. I agree that the fork probably dropped out when you took it apart.

What will cause a car to seem like the clutch is slipping ONLY in corners? My bet is the posi is gone. Check the turning torque, easy to do. A clutch won't magically engage on the straights under more power than the corners.

Was the clutch slipping, you betcha! The why? We'll find out soon.

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: 1-2 Shift Fork issue
Posted by: alphasud ()
Date: May 18, 2020 12:40PM

Ken you are right. I jumped the gun looking at the pictures. Wasn’t until Wagonmaster commented that I went back and saw the error in my ways.

David North Idaho
1965 Corsa Turbo converted to 140
1971 Super Beetle with 2.5L Subaru engine
1965 Corsa mid engine project
1973 Mercedes 280 project

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Re: 1-2 Shift Fork issue
Posted by: diegocorsa ()
Date: May 18, 2020 05:20PM

I checked the posi turning torque and I stopped trying at 65ftlbs so I believe the posi is good and solid??

-Cory
'66 Corsa
Nebraska




Edited 1 time(s). Last edit at 05/18/2020 05:29PM by diegocorsa.

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Re: 1-2 Shift Fork issue
Posted by: vairmech ()
Date: May 18, 2020 05:38PM

diegocorsa Wrote:
-------------------------------------------------------
> I checked the posi turning torque and I stopped trying at 65ftlbs so I believe the posi is good and solid??
>>>>>>>>>>>>>>>>>>>>>

GM book minimum is 55#'s. I'm still wondering if you are lifting a tire on corners, I have on the race car because I can hear the engine flair.

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: 1-2 Shift Fork issue
Posted by: diegocorsa ()
Date: May 18, 2020 05:47PM

vairmech Wrote:
-------------------------------------------------------
> diegocorsa Wrote:
> -------------------------------------------------------
> > I checked the posi turning torque and I stopped trying at 65ftlbs so I believe the posi is good and solid??
> >>>>>>>>>>>>>>>>>>>>>
>
> GM book minimum is 55#'s. I'm still wondering if you are lifting a tire on corners, I have on the race car because I can hear the engine flair.


That is entirely possible! My car is very rigid being caged, urethane bushings, rear sway bar and running R compound tires.

-Cory
'66 Corsa
Nebraska

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