VW Automatic Register

Technical forum => Technical => Topic started by: jayson.devries on 06 February 2020, 01:49

Title: Testing clutch operation on the bench
Post by: jayson.devries on 06 February 2020, 01:49
I've just replaced the clutch and throwout bearing in my AutoStick gearbox. Before I put it back in the car I'd like to ensure it is operating properly. So on the bench, in gear, I turn the input shaft by hand and the axle flanges turn. Great!  With the clutch arm and servo arm adjusted, I draw a vacuum with my Mityvac hand pump. The clutch arm pulls all the way with the expected resistance. Now I turn the input shaft and.... the axle flanges are still turning! Hmmm.. ??? (scratches head).
 
Have I assembled something wrong? I'm quite certain the clutch fork was positioned between the clutch cover and the TO when I attached the bell housing - besides, the arm moves with the expected resistance. Am I missing something? Any ideas?
Title: Re: Testing clutch operation on the bench
Post by: Tom K. on 21 February 2020, 22:14
My process to reassemble the clutch appears on the bottom of this thread

https://www.thesamba.com/vw/forum/viewtopic.php?t=714131&start=40
Title: Re: Testing clutch operation on the bench
Post by: jayson.devries on 01 March 2020, 01:14
Thanks Tom - great post and pictures!

I did finally solve this. The only thing that made sense was that the new clutch had stuck itself to the pressure plate and/or the carrier plate. A piece of critical information that I thoughtlessly left out of my first post was that it had been sitting for over a year since I assembled it. Since the oil plan was already attached, I really wanted to avoid opening it up (I gotta start making my own gaskets like you Tom). So I bolted levers to the axle flanges, carefully clamped on to the input shaft, pulled a vacuum on the servo, and tried my damndest to snap it lose... to no avail.

Out of options, I did finally open things up and did find the clutch stuck to the carrier plate. Not so much rust as just clutch material. I'll post pictures tomorrow.
Title: Re: Testing clutch operation on the bench
Post by: jayson.devries on 02 March 2020, 15:24
Here are a few pictures of the clutch material (asbestos?!) rusted/stuck to the pressure plate and the carrier plate.

(https://lh3.googleusercontent.com/GzQhy-rZFtdMsUdPD66QOkYDCmITzaBA-A6zguA89AQBlOQPAiPxwK8dK3kLUrEC4t-5rYxYiBXdJMaxiA2fSSvXpuJGmuniSRdDLotGL4_8XB5oIUZ-XRpCyNFOzO6tCKFrzxwqx5dmm-cxLnooVRxSJ-Ddi3E2aK0eS8mlpuK1ZTXJg1hpQRYE2gBLzDYtPCjZiOSEupcZxVS5gEC_Z0oCS3rPu8fdwd3ZfabG21pbXwbvPCQnlCA9UFd4BFXXJjX37J15COqqeBkhjY4lshAfXofz3KRCFyqi6wKa_v74WR_4LlHnxA12H7kk3du4X9tvoa_9-jbUuXhptKZwkaR9LfL-wQFb3Zgv_kUAbuptRLEaaLwvR-4bGHrcG9xlLPbU9FfCYMXzTJXW7HAwN9h5PcGWpuHLrSdWdGF3mtEDn_7yxlg9wAzHfvXG_lHZwvyOBo7VnaghsqDFboR2-tlBYLbVOkvzwD2-blgKDVtBrYELRjS67aNQL-oc4Vq3Wtgm4oxBVWjX530LV7zvLuGC2MS5HYz2fmtK3M_HL56J9gsgYNLG9e7u0K4YVC2ltIFF99YjP3OPjf0L90DBsQ38F7Y2KM9sj2FERDowR-9HNu_1kmWhXodKC7hHo8mh0RzWogaKClAtVA-YT9-6XLLklgx3GVoG7fDD11aJAac2kakxsocDZzcWO6p3VHhl7NzbUxK8EgoY_WPVVNp_ZyWaWQwvu4bq6yCyUQEts0dZygW79g=w1592-h1194-no)

(https://lh3.googleusercontent.com/0uLfSLIUr9ZfkjYrdw7W8CEvxW8n666stZ_H5rezdc-ggdGP4jONiIMNcGRLj5RUULPDAtwe_i9Jz8hoNELKqP6xWirLMNChIQn6g53gbzmiCWfvOshXzxXEt3gFe4j2QU2hcu4J2FZDQEh07pdrBsQ6nMPyCX5EqbQDPZCV3UJISECLjflWOxWAhIlSPXhIXX8KIUqu2PHurugL_8edKLV008jRmVWO8_wnOxI7HSZxIqhJQzk_uQATGJt_NrRlj1LESNE4P3EVb7a_bBMd9uLGET6V6joiXSeLSzNMFN0-4cfL1dAfdNV5sex8ldPBS-I30JjyB7cN-9pxDXngDFwE4TnRjngKmgDUmyHQTgoOc_WOm_zTK6ZG3io8kwVUMfTaAGJKd1uBv_IXgTAJfjCOXPTOG_2x4NamPcvG5Tj5Tucjsj6P4kqYviorINWwO9X44aJr-XSoQBLeYmTEHHIuxvo9p3NYJRQ_vtaf11245bQqTLkT1Oz8JueVSfU-s5cHRglPpppcd5vj_4zk5DnpAPmi2qcNlXzORYyRc_MkubOhFvzi-OtIEhDP-6JyHP8MOexpKFzFr1S3haTaDvQImstDLkAvAhjr_g_-7BuDpJ13sWXYkAe890--eAeekzffHbm4yFzKEmPUOwixrUv-zGTXIlyIt5yJ3RvKvJtIePSwNv1_9fbV=w1592-h1194-no)
Title: Re: Testing clutch operation on the bench
Post by: Tom K. on 10 March 2020, 04:15
Bummer. I had the same issue. I used a razor blade and then light sanding to clean the pressure plate. Pictures appear in one of the first pages on my build thread with link above.