1992 964 convertable top mechinism repair

[jabraham]

Does anyone know of any manuals or literature on the repair of the mechanism that moves the top up and down on this car. Mine no loner works and makes a crunching sound when activated. Parts list, schematic diagram, etc.

[gduke]

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Pelican Parts Technical BBS > 1- Porsche Technical Forums > Porsche 911 Technical Forum > 993 convetible top closure problem
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RickM
Senior Member

Registered: Nov 2002
Location: Convent Station, NJ
Posts: 3849
993 convetible top closure problem
Seeking a solution for a friend. The following is an interpretation of his vague problem description....

1995 Cab with a recent new battery. Previous battery had been dead for a while.

When working properly one set of motors opens the convertible top and unfolds it to the point where the posts in the soft top make contact with the female receptacles in the windshield frame. At this point another set of motors (in the windshield frame?) kick in and pull the posts into the frame completely.

The problem is my friend's top closes top to the point where it makes it to the windshield frame but not far enough for the posts to enter the receptacles. As a result the closing process cannot complete.

Dealer needs to see the car as the motors are out of sync...a result of the dead battery.

Anyone have a clue on a re-syncing process?


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11-17-2003 08:43 PM



Britwrench
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Registered: Aug 2001
Location: Seattle WA USA
Posts: 1527
It has nothing to do with the dead battery. The main frame needs adjusting forward to allow the pins to locate. Also the microswitches that turn off the lifiting motor and turn on the header rail motors need adjusting. All of these adjustments are fairly simple.


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11-17-2003 08:57 PM



RickM
Senior Member

Registered: Nov 2002
Location: Convent Station, NJ
Posts: 3849
Just going by what the dealer told a friend. I haven't seen it in person yet. Although I have a feeling I will soon.

Could you give me an idea where the main adjustment and micro switchs are?


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Rick

Presently in the German car stable:

'85 Carrera (Steel Flatnose)

'85 380 SL
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11-17-2003 09:02 PM



RickM
Senior Member

Registered: Nov 2002
Location: Convent Station, NJ
Posts: 3849
Bump


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11-19-2003 05:25 PM


AFJuvat
Senior Member

Registered: Feb 2001
Location: Viera FL
Posts: 3204
The first thing he has to do is get the tension off of the cab top.

Do this by undoing the 6mm allen bolts on the top of the transmission arm - this will disconnect the cab frame from the transmissions. Do not loosen the 19mm bolt in the center of the transmission.

With no tension on the top, the top should drop into the guides on the windshield frame. Use the power latching to lock the top closed.

Next. Remove the backpad and disconnect the drive cables from the cab top motors.

Now it is time to remove the transmissions and realign them. Unbolt them from the side panels of the car - 3 X 10mm bolts with spacers behind them.

(You do the following to both transmissions)

On the back side of the transmission, you will see a black plastic plate and a silver plate where the cable connects. Remove the screws that secure the silver plate. This will disconnect the drive cable from the transmission. Clean and regrease the gears and the cable. Set aside for the moment.

Check the transmission arm for free movement The arm should move through 360 degrees of rotation without binding or catching anywhere. If it binds anywhere, the transmission is damaged beyond repair and must be replaced.

(This next part is optional)

Assuming the transmission moves freely, loosen the 19mm bolt in the center of the transmission and remove the arm and the shims that are behind it. Note the orientation of the arm as it relates to the gear

The "Half gear" and center hub should pop out of the transmission housing at this point.

Clean and grease the center hub.

Replace center hub and "Half gear", replace the shims and arm, tighten canter bolt (blue loctite optional)

(End optional procedure)

Now for the alignment (this also applies if you are replacing the transmission): On the center of the transmission arm, you will see a raised nub, about 3/4 of an inch long. On the transmission housing, you will see a notch. On a replacement transmission, they will be aligned already - Otherwise, line the nub up with the notch.

Reinstall the gear drive on the back of the transmission

The transmission is now at factory defualt for a closed and locked top.

Reinstall the transmission on the side panel of the car - leave the bolts loose for now.

Repeat the above procedure for the other transmission.

Now that both transmissions are installed, but still loose - reattach the arm on the transmission to the cab top frame. With the transmissions loose, you can move it around a bit to "find" its natural position.

Once the transmissions are reattached, tighten the bolts holding the transmissions to the car.

Reconnect the cables and test.

If you are still a bit off:

Below the transmission, there is what looks like a big butterfly nut secured with two 17mm bolts, one on each "wing".

Loosen the bolts and slide the cab frame forward or back as necessary.

Do not touch the nuts below the butterfly.

Retighten.

If you are STILL off. Behind the small zippers on either side of the cab top, you will see the main supports for the cab top. the support is held in with 6mm socket head cap screws. Take a 6mm allen wrench and loosen the screws and slide the frame a bit more forward or back as necessary.

Still off? Seek professional assistance.

AFJuvat


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[seafeye]

I have 1 transmission arm going up while the other 1 goes down. Got me stumped. Ideas?

1992 C4 Cab.

[ian c2]

Iirc , 964 used 2 seperate motors One for each side .
There behind the rear seats
If polarity is out , motor will spin oposote to direction needed , so check wiring .

[seafeye]

Originally Posted by ian c2

Iirc , 964 used 2 seperate motors One for each side .
There behind the rear seats
If polarity is out , motor will spin oposote to direction needed , so check wiring .

The motors are both connected to each other with a pin. So if the polarity was reversed both motors would be fighting each other.

[ian c2]

I thought they changed to 2 seperate motors on the 964 ?
I should have looked at my car when I visited today , but didn’t think .
I’m old ...
I can just about remember that there are 2 motors behind the rear seat panel

If the motors are connected , one will be going backwards anyway in normal operation .
Like a crank might be clockwise at pulley end , but counterclockwise when you look at flywheel end .
That’s all I got .

[seafeye]

Originally Posted by ian c2

I thought they changed to 2 seperate motors on the 964 ?
I should have looked at my car when I visited today , but didn’t think .
I’m old ...
I can just about remember that there are 2 motors behind the rear seat panel

If the motors are connected , one will be going backwards anyway in normal operation .
Like a crank might be clockwise at pulley end , but counterclockwise when you look at flywheel end .
That’s all I got .

Do you think the cable worm gear could be the culprit? Spinning the wrong direction?
I’ve verified the motors. They are both working and in the proper orientation.
Double checked part numbers on the new cable. It checks out.

993 561 922 03

Top was working correctly before but old cable was coming out of the motor.

[ian c2]

I was thinking about this last night .
It’s been about 15 years since I last worked on , or even looked at , a 964cab roof .
Pretty much all I can remember is changing out one of the motors , and they’re behind the rear seats .
Changing out the cables that go from motor to gearbox behind side panels .
Vague recollection of comparing a new with old and realizing the length had changed with use , so replacing both .
Playing with limit switches on mechanism drivers side rear (rhd) , and buying a small electric screwdriver to keep in door pocket so I could use roof manually (top catches are a pain to use manually )
I’m not sure if both side mechanisms have limit switches .
Sorry I can’t be more help from memory or knowledge , but I may be able to help with pics from my car (1993 cab)