Decided to fix those dang door locks. I could lock the cab doors, but if I then returned to the door, and pressed the trigger before unlocking it, the key would then not 'un-lock' that door, and another door had to be used to gain access to the bus. Others may have experienced similar problems.
I followed this excellent guide;
http://www.type2.com/rvanness/lock.htm" onclick="window.open(this.href);return false;
some good pics on here as well 'Rustbus'
http://www.thesamba.com/vw/forum/viewtopic.php?t=377711&postdays=0&postorder=asc&start=120" onclick="window.open(this.href);return false;
I started with the passenger door as I thought it might be a bit easier as it's less used.
I undid the door release lever, after removing the door card and plastic vapour barrier.
I got rid of the plastic silver bubble wrap type heat insulation, and just leave the silent coat noise insulation on the door. The plastic heat insulation had come unstuck in a few places from when I stuck it two years ago, and I questioned its value as a heat insulator in this situation. I removed it before fitting the vapour barrier plastic sheet.
undo the bolt for the window guide channel
location for the clip at the top of the guide channel. ( this maybe the other door I think)
pull out the guide channel. Needs some force! It wasn't in too bad condition. I cleaned it up and greased it before replacing it.
remove the door handle
undo the three screws holding in the door lock mechanism. These came out ok just needed a big phillips screw driver.
cleaning up the lock with foam degreaser
The broken spring can be seen.
offending spring, the driver's door spring I did later was completely missing.
new and old springs
new spring fitted. It was a bit fiddly but not that difficult.
plastic sheild on door lock mechanism
I also re-did the plastic membrane, using double sided tape, adding in a second layer for the holes in the door panel and tucking them in. I cleaned up the door with white spirit to get rid of all old glue and grease.
I used liquid graphite for the door lock mechanism after cleaning it up.
took me ages to do the passenger door, but only about 1 1/2 hrs for the drivers door. So nice to have the locks working properly!