Help ! Sudden No Auto Gear Shift
10-15-2012, 10:12 PM
#91
Rennlist Member
http://www.ganzeboom.net/images1/gan...3,%20722.4.pdf
If the rod at 991 popped off you would have detents, but no actual shifting.
If the rod at 991 popped off you would have detents, but no actual shifting.
10-15-2012, 10:22 PM
#92
Nordschleife Master
Thread Starter
We really need to isolate if the shifting mechanism is doing anything or not.
If the car is off the ground, put it into park. Then rotate both rear wheels, in the same direction, with your hands. Sometimes there will be an audible "clunk" as the park pawl engages into the teeth. Sometimes not, as the "teeth" may line up with the pawl when shifted into park.
Once both wheels, turning in the same direction will not turn, go up and take it out of park and put it into neutral. Then see if both wheels can be turned in the same direction.
This test should tell us if the differential is properly connected to the output shaft of the transmission.
If the car is off the ground, put it into park. Then rotate both rear wheels, in the same direction, with your hands. Sometimes there will be an audible "clunk" as the park pawl engages into the teeth. Sometimes not, as the "teeth" may line up with the pawl when shifted into park.
Once both wheels, turning in the same direction will not turn, go up and take it out of park and put it into neutral. Then see if both wheels can be turned in the same direction.
This test should tell us if the differential is properly connected to the output shaft of the transmission.
10-15-2012, 10:36 PM
#93
Former Sponsor
10-16-2012, 12:08 AM
#96
Nordschleife Master
Thread Starter
http://www.ganzeboom.net/images1/gan...3,%20722.4.pdf
If the rod at 991 popped off you would have detents, but no actual shifting.
If the rod at 991 popped off you would have detents, but no actual shifting.
Thanks for the images in that link.
Shop is closed until tomorrow.
Craig
10-16-2012, 12:19 AM
#97
Factory repair guide:
http://www.w124performance.com/docs/...722_repair.pdf
Mitchell troubleshooting guide:
http://www.w124performance.com/docs/...2_Mitchell.pdf
http://www.w124performance.com/docs/...722_repair.pdf
Mitchell troubleshooting guide:
http://www.w124performance.com/docs/...2_Mitchell.pdf
10-16-2012, 01:12 AM
#98
Nordschleife Master
Thread Starter
Factory repair guide:
http://www.w124performance.com/docs/...722_repair.pdf
Mitchell troubleshooting guide:
http://www.w124performance.com/docs/...2_Mitchell.pdf
http://www.w124performance.com/docs/...722_repair.pdf
Mitchell troubleshooting guide:
http://www.w124performance.com/docs/...2_Mitchell.pdf
Thanks again for these links. May be useful to me if the problem lies with the selector linkage internally. I still have to go through diagnostics regarding the differential first. Will keep all posted.
10-16-2012, 01:22 AM
#99
Former Sponsor
I don't care about opposite direction. That just tells us that the tires are attached to the axles and the axles are connected to the transmission, and the spider gears work, inside the differential.
Re-read my post #89 and try to do what it says.
Use your hands to turn both tires at the same time, in the same direction.
Or....put the car on the ground and try to push it forward while in park. Emergency brake released.
Re-read my post #89 and try to do what it says.
Use your hands to turn both tires at the same time, in the same direction.
Or....put the car on the ground and try to push it forward while in park. Emergency brake released.
10-16-2012, 01:29 AM
#100
Nordschleife Master
Thread Starter
Sorry Greg.
I'm working solo. I can get my son to help with the maneuver before he gets off to school tomorrow. I'll report back then.
I'm working solo. I can get my son to help with the maneuver before he gets off to school tomorrow. I'll report back then.
10-16-2012, 02:03 AM
#101
Rennlist Member
10-16-2012, 05:29 AM
#102
Addict
Rennlist Member
Rennlist Member
I can't remember if this has been covered already so apologies if it has.
Have you verified that movement of the shift lever actually gives you the full range of movement at the selector lever on the side of the box ? The rigid part of the selector cable can fail partially allowing it to bend sideways (as in Viagra would cure this problem!) then movement of the shiift lever does not cause enough movement of the selector lever on the box. Hence you could at the moment just be dangling around somewhere between neutral and park.
Suggest disengaging the selector cable at the selector lever on the box, then move the lever to one extreme and with engine running see if the wheels turn. if not repeat with the selector lever on the box moved to the other extrreme. even if I am wrong this may also provide some clues as to what may be happeing inside the box. Engagement of each position directly at the lever on the box is a very definite positive click.
Have you verified that movement of the shift lever actually gives you the full range of movement at the selector lever on the side of the box ? The rigid part of the selector cable can fail partially allowing it to bend sideways (as in Viagra would cure this problem!) then movement of the shiift lever does not cause enough movement of the selector lever on the box. Hence you could at the moment just be dangling around somewhere between neutral and park.
Suggest disengaging the selector cable at the selector lever on the box, then move the lever to one extreme and with engine running see if the wheels turn. if not repeat with the selector lever on the box moved to the other extrreme. even if I am wrong this may also provide some clues as to what may be happeing inside the box. Engagement of each position directly at the lever on the box is a very definite positive click.
10-16-2012, 06:56 AM
#103
Rennlist Member
This is a picture of what Jon described. This would be the best case scenario because it is an easy fix. The aluminum guide shaft in the picture is broken and does not keep proper tension on the cable itself.
10-16-2012, 08:45 AM
#105
Nordschleife Master
Thread Starter
I can't remember if this has been covered already so apologies if it has.
Have you verified that movement of the shift lever actually gives you the full range of movement at the selector lever on the side of the box ? The rigid part of the selector cable can fail partially allowing it to bend sideways (as in Viagra would cure this problem!) then movement of the shiift lever does not cause enough movement of the selector lever on the box. Hence you could at the moment just be dangling around somewhere between neutral and park.
Suggest disengaging the selector cable at the selector lever on the box, then move the lever to one extreme and with engine running see if the wheels turn. if not repeat with the selector lever on the box moved to the other extrreme. even if I am wrong this may also provide some clues as to what may be happeing inside the box. Engagement of each position directly at the lever on the box is a very definite positive click.
Have you verified that movement of the shift lever actually gives you the full range of movement at the selector lever on the side of the box ? The rigid part of the selector cable can fail partially allowing it to bend sideways (as in Viagra would cure this problem!) then movement of the shiift lever does not cause enough movement of the selector lever on the box. Hence you could at the moment just be dangling around somewhere between neutral and park.
Suggest disengaging the selector cable at the selector lever on the box, then move the lever to one extreme and with engine running see if the wheels turn. if not repeat with the selector lever on the box moved to the other extrreme. even if I am wrong this may also provide some clues as to what may be happeing inside the box. Engagement of each position directly at the lever on the box is a very definite positive click.
The excursion of the selector arm at the trans. is normal through its range. Its communication with the shifter seems unobstructed/unimpeded.