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Rear Spring Plate Adjustment
silver - April 3rd, 2003 at 04:14 PM

Does anyone know the finer points of adjusting the rear end of a split screen i know the basic principles but!
what are the increments per spline in mm? I want to drop the rear 25 mm

splitbusaustralia - April 3rd, 2003 at 04:26 PM

Normal springplate angle is 20 deg (plus or minus half deg) between unloaded springplate and bus level. Taking it down to 7 deg is about a 3 inch drop. Thus 13 deg change is 3 inch drop. You can do the exact math but 25mm would be about 4 deg drop (to about 16 degs between springplate and bus level) roughly ...

To obtain the roughly 4 deg drop :

Moving one outer spline either way is 7.5 degrees. Rotating the bar to
change to the next spline internally is 8.16 degrees. The difference is 40
minutes of arc, or 2/3 of a degree, making for fine adjustment ability. Again you should be able to work out how many inner and outers for neg 4 degs.

RobK

silver - April 3rd, 2003 at 04:56 PM

Perfect Answer Rob! now that takes alot of trial and error out of the job so i simply rotate the inner spine clockwise six clicks and and the outer anti clock six clicks giving me 12/3 or 4 degrees ....

aussiebug - April 4th, 2003 at 12:46 PM

Quote:
Originally posted by splitbusaustralia

Moving one outer spline either way is 7.5 degrees. Rotating the bar to
change to the next spline internally is 8.16 degrees. The difference is 40
minutes of arc, or 2/3 of a degree, making for fine adjustment ability. Again you should be able to work out how many inner and outers for neg 4 degs.

RobK


Rob - that measn the buses have different numbers of splines on the axles compared to the bugs???

The bugs have 40 splines on the inner end and 44 on the outer end - that makes 9 degrees for one inner spline and 8 degrees 10 minutes (about 8.1 degrees) for one spline on the outer end.

And a one-up one-down rotation (50" or about 0.9 degrees in total) equates to between 12 and 16mm change in ride height for a bug.

Silver, the complete process is on my web site at

http://www.geocities.com/aussiebug1970/rearaxle.html 

56astro - April 4th, 2003 at 01:50 PM

Buses have 44 and 48 splines from memory. (I'm pretty sure of the 48 one though)

splitbusaustralia - April 4th, 2003 at 01:57 PM

Yes - splitbusses are 'finer' splined and I think you are right on with the 48 on the spring plate end (going from memory too!)

RobK

silver - April 4th, 2003 at 05:35 PM

Very good info guys with This i might just have to do it once....
keep a lookout for a low containervan:thumb