Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > Porsche Forums > Porsche 944 Turbo and Turbo S


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
soxnail's Avatar
 
Join Date: Oct 2006
Location: Laguna Vista
Posts: 1,271
Rear Hatch unlock R&R

As I have been redoing MadDog I have also been fixing the bits and pieces that have not worked in years. So it was the hatch locking mechanism's turn.
The system is reasonably (and surprisingly for 951) uncomplicated.
Consists of 2 pan head screws in the hatch, that are held in the down and locked position by 2 ring style locks that can expand to let the screw in and then lock around it. To unlock using either key or the unlocking motor, the operation is the same, a twist of the mechanism pushes 2 rods out towards the lock rings and they expand releasing the hatch.
See pics:









The failure mode is either it won't lock, or won't unlock. It can also lock/unlock one side only.

To trouble shoot/fix, first make sure that the lock ring/s expand and contract freely with the key being used to unlock (will get to the motor driven process later).
If rings are frozen or sluggish use WD-40 on the lube points shown and also into the little well the rings live in.
Manipulate the mechanism to where it moves freely and you can see the rings expand and contract.
After the above make sure the length of the pan heads is correct to get them deep enough into the rings to lock, but not so long as to be loose. I adjusted mine to where I have to use a firm down wards pressure on the hatch to lock it, and it does not have any motion/play after it locks.
Once the system works with the key we can now move to the electric unlock.

The motor (shown above) drives a gear mechanism which pulls the lock mechanism via a 'Z' shaped lever attached to a pull cable. When the motor rotates the cable is pulled (unlocking) and when the motor returns home position it allows the mechanism to lock.
On mine the lever and the cable attachment were broken, I had removed them some time ago to fix and did not get back to them.
The lever is available from Pelican and other sources....but it costs 130.00 bucks. I did not price the cable.
Will continue next post, apologies about the text in the pic hope it is legible with zoom, if not will redo.
Sox
__________________
"Little problems always come back and bring bigger friends with them".
1986 951"MADDOG" black with maroon interior
All stock with shimmed WG
Old 09-06-2018, 04:54 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
In the Fires of Hell.....
 
kdjones2000's Avatar
 
Join Date: Oct 2007
Location: Phoenix, AZ
Posts: 2,916
Garage
I have this stuff I am about to put up for sale, including the cable.

$15 bucks shipped and it's yours...

__________________
NASA/PCA Instructor
'88 951S - with LBE, Guru chips, 3Bar FPR, 1.3mm shimmed WG, 3120 lbs, 256 RWHP, 15 psig boost
1987 924S 944 SPEC racecar - '88 pistons/DME, short 5th
1987 944S - Restored salvage title, ready to live again
Old 09-06-2018, 09:13 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered User
 
soxnail's Avatar
 
Join Date: Oct 2006
Location: Laguna Vista
Posts: 1,271
Keith just a bit too late I already rebuilt it.
Thanks.

So to continue....
I built a drive lever from a piece of steel stock I had lying around.



The cable was shredded



Welded an attach point to the motor drive lever to pull the cable with.



Old sheath without the cable in it.



Cut the cable off from the 'Eye' in the push drive mechanism.



Cut a thread on the 'eye' to put a threaded aluminum piece to hold the cable to the 'eye'





Source of new cable.



Inserted the cable attached it and crimped it.



to be continued hit the 10 pic limit.
Sox
__________________
"Little problems always come back and bring bigger friends with them".
1986 951"MADDOG" black with maroon interior
All stock with shimmed WG
Old 09-06-2018, 10:10 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Registered User
 
soxnail's Avatar
 
Join Date: Oct 2006
Location: Laguna Vista
Posts: 1,271
Ok upwards and onward...



Installation on the car is pretty straight forward. Remember the 'C' , it is a pain to put back on when you have to do it looking upside down into the hatch.





Now for the easy part
the electrical stuff.
The Motor is actuated by power sent to it from the switch in the floor well. This is the red/white wire.
The brown wire is the return to Gnd.
The motor rotates and the lever pulls the braided cable and releases the locks.
When the switch is released the power in the red wire (always on) returns the motor to 'home' which is the locked position.
The white wire is the 'home' return wire.
See pic



Issues:
1) fuse #11 15amp blown.
2 ) Bad switch.
3) Bad motor.

If any one like me to further post on the above 3 will do so.
Sox
__________________
"Little problems always come back and bring bigger friends with them".
1986 951"MADDOG" black with maroon interior
All stock with shimmed WG
Old 09-06-2018, 10:26 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
In the Fires of Hell.....
 
kdjones2000's Avatar
 
Join Date: Oct 2007
Location: Phoenix, AZ
Posts: 2,916
Garage
One thing I found on this latest 944 of mine is that the screws on the electric motor itself that hold the magnetic portion in place over the armature windings can come loose and even fall out.

This causes the magnet to shift and contact the armature, preventing the motor from functioning. If the motor is in the "return home" mode, it will drain your battery and heat up the motor.

Another thing to look at if your hatch release button doesn't work and you have some mysterious current drainage going on.

Ask me how I know....
__________________
NASA/PCA Instructor
'88 951S - with LBE, Guru chips, 3Bar FPR, 1.3mm shimmed WG, 3120 lbs, 256 RWHP, 15 psig boost
1987 924S 944 SPEC racecar - '88 pistons/DME, short 5th
1987 944S - Restored salvage title, ready to live again
Old 09-06-2018, 11:29 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Registered User
 
Join Date: Sep 2008
Location: Atlanta area
Posts: 380
Thumbs up

Sox,
Just excellent. I appreciate all the time you took to post the pics and write ups.
So far mine works, but I'm bookmarking this post and dropping in the Porsche folder
__________________
Bruce P.
1988 951 Alpine White, AutoAuthority chip, HRE custom wheels, 10 speaker panels, Schnell short shifter, M030 sways, Koni Sports
"You're the best I ever had" --JJ Cale
Old 09-06-2018, 06:38 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
Registered User
 
soxnail's Avatar
 
Join Date: Oct 2006
Location: Laguna Vista
Posts: 1,271
Thanks Bruce...just a little payback for all the help everyone on this forum gives me.

Keith, the tail gate motor has a thermal relay to disconnect the motor after a little time, so it should not have been running (or trying to) and drain the battery .
Sox

__________________
"Little problems always come back and bring bigger friends with them".
1986 951"MADDOG" black with maroon interior
All stock with shimmed WG
Old 09-08-2018, 01:42 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 07:59 PM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.