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Sudden loss of car movement thru PG transaxle
Posted by: dryenko ()
Date: November 23, 2017 03:32AM

1966 Corvair with 110 engine and PG.
Operating normally in all gears and shifting from low to high gear.
Pulled up to a stop and attempted to back up.
Now no power from running engine to rear wheels.
In any position of the shift lever.
And no unusual noises from drive train before of after.
With the except of a seeming harder than normal shift into reverse, but not severe?
Engine starts normally so converter is still attached to crankshaft.
Fluid level is correct.
Admittedly not a expert on PG equipped Corvairs !!
So to this group of experienced folks :
What is the possible scenarios for this failure ?
In order of most common to least common, please.
And suggested repair options
Thanks,

Bob C aka Dryenko
Dobson, NC 27017

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Re: Sudden loss of car movement thru PG transaxle
Posted by: Lane66m ()
Date: November 23, 2017 04:02AM

Broke cable? Have someone move the lever while you look at transmission connection. Might have to do some disassembly to see actual cable.

Al Lane
Ellabell GA

1966 Monza Coupe, 110 hp, 4 Spd
1966 Corsa Turbo Coupe, 180 hp 4 Spd
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
2015 Chevrolet Malibu 2LT
2015 GMC Sierra SLT Crew Cab
1968 Camaro SS Coupe 350 CI 295+ HP PG
1947 Farmall A tractor 15 hp





Edited 1 time(s). Last edit at 11/23/2017 04:04AM by Lane66m.

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Re: Sudden loss of car movement thru PG transaxle
Posted by: dryenko ()
Date: November 23, 2017 04:25AM

Thanks Al, will do.
The cable movement and "drag' seems normal like it is still connected to "something"
Any other thoughts?
I was thinking diff pinion gears but there is no apparent noise from the diff.

Bob C aka Dryenko
Dobson, NC 27017

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Re: Sudden loss of car movement thru PG transaxle
Posted by: Mike Stillwell ()
Date: November 23, 2017 04:52AM

Bob, There is a 3 tab "washer" on the end of the PG input shaft (smallest of the 3) that Clark's reproduces. They must sell them for a reason.

Mike
YS-117

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Re: Sudden loss of car movement thru PG transaxle
Posted by: dryenko ()
Date: November 23, 2017 05:10AM

Thanks Mike for the reply.
Looking at the PG parts diagram, is that the one under the cover at the front of the PG trans?
Held on with a snap ring?
I assume it droves a pump ?

Bob C aka Dryenko
Dobson, NC 27017

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Re: Sudden loss of car movement thru PG transaxle
Posted by: davemotohead ()
Date: November 23, 2017 07:25AM

That washer runs the front pump, they do get worn as they have a Babbitt coating like a rod bearing, the front pump runs all the time when the engine is running so if the shaft or washer strip out the splines I guess you would have no internal pressure? Does changing gears do anything? Hard for me to think the cable broke as its a big cable, but I guess the ball could have broken off the end of it? or you have a pump failure? I am just getting into the workings of the PG right now but they seem very simple.





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Re: Sudden loss of car movement thru PG transaxle
Posted by: ac1948 ()
Date: November 23, 2017 07:49AM

Did the cable become disconnected from shift lever?

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Re: Sudden loss of car movement thru PG transaxle
Posted by: Lane66m ()
Date: November 23, 2017 08:11AM

That is point I was going for. Quick checks of simple items before delving into the PG.

Al Lane
Ellabell GA

1966 Monza Coupe, 110 hp, 4 Spd
1966 Corsa Turbo Coupe, 180 hp 4 Spd
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
2015 Chevrolet Malibu 2LT
2015 GMC Sierra SLT Crew Cab
1968 Camaro SS Coupe 350 CI 295+ HP PG
1947 Farmall A tractor 15 hp


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Re: Sudden loss of car movement thru PG transaxle
Posted by: dryenko ()
Date: November 23, 2017 08:12AM

ac 1948 Don't think so as the feel when trying to shift hasn't changed, but I will of course check behind the dash.
Dave , the movement of the shift lever / cable does nothing. Haven't pulled the cable to check the ball on the cable end, but will do so tomorrow.
I am making up a list of items to check, so please keep the ideas coming.
I am hoping the KISS approach will result in something obvious.
BC

Bob C aka Dryenko
Dobson, NC 27017

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Re: Sudden loss of car movement thru PG transaxle
Posted by: EM-racer ()
Date: November 23, 2017 08:14AM

The 3 tab washer on my race car was warn on one end so I reversed it and have had no problems, don't know if this is your problem ??
Gene Barr
Eustis Fl.

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Re: Sudden loss of car movement thru PG transaxle
Posted by: aircooled6 ()
Date: November 23, 2017 08:28AM

Splines on the driveshaft nub (technical term) that goes into the right side of the differential? I've had that happen before, although I think it was on earlies where they can move around more.

Everett Wilson
North Richland Hills TX
(Now, South of 820!!)
64 Greenbrier 110 with 95 heads/PG

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Re: Sudden loss of car movement thru PG transaxle
Posted by: solo2r ()
Date: November 23, 2017 08:42AM

Will not be able to see the cable move externally except at back of shifter!
If the cable is broken, the shifter will pretty much feel normal as there are spring loaded detents within the unit. Will have to drop pan to see if cable is moving when shifting.

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Re: Sudden loss of car movement thru PG transaxle
Posted by: ac1948 ()
Date: November 23, 2017 08:45AM

Dryenko, the detent in the shifter is what you feel when shifting. Jerry

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Re: Sudden loss of car movement thru PG transaxle
Posted by: vairmech ()
Date: November 25, 2017 04:27AM

Had that happen once, I changed the trans only to find out that one of the valve body bolts had come out.

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: Sudden loss of car movement thru PG transaxle
Posted by: corventure Dave ()
Date: November 27, 2017 11:01AM

Had a 65 Monza, powerglide that I picked up cheap because it would not move in any gear. The problem turned out to be a long shot, but at least it was obvious.
The pinion gear was spinning on the pinion shaft in the differential! As far as I could tell the transaxil was original.

Corventure Dave

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Re: Sudden loss of car movement thru PG transaxle
Posted by: dryenko ()
Date: November 27, 2017 06:07PM

Thanks Ken and Dave for those ideas.
I am zeroing in on the pump drive shaft / drive plate or snap ring as a possible cause.
After getting the input so far.

Bob C aka Dryenko
Dobson, NC 27017

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