Wade,
The 20B has a 2-piece eccentric shaft that must be split to disassemble the engine.  You should remove the #1 rotor, rotor housing and front shaft, then #3, and finally #2.  There is a threaded hole in the rotor journal of the front shaft that you can thread an all-thread into.  I first tried a slide hammer approach, but that didn't work.  A good friend loaned me his home made adapter.  It consists of an all-thread, and a 1" thick plate with a hole that slips over the all-thread.  The 1" plate should be about 4" wide and 8 - 10" long, but that's not critical, you just need the length for added leverage.   Using the plate and a large nut, you position the 1" plate down onto the all-thread until it touches the end of the main shaft (extends through the smaller shaft out the front of the engine).  It should touch the e-shaft about an inch or so from the all-thread.  Screw the nut down to where it is touching the 1" plate, and then go about a half a turn extra.  One or two blows with a medium sized hammer/mallet on the outer edge of the 1" plate will pop the small shaft off the main shaft.  Suggest you use a piece of aluminum or brass between the 1" plate and the front of the e-shaft to prevent damaging the threads.  I was amazed at how well this simple puller worked.

Note: the e-shaft should be supported from the flywheel end when you smack the 1" puller plate with the hammer.

Hope this helps,
Mark Steitle
20B - First run of rebuilt engine 9/14/03 ! ! ! 


  At 02:35 AM 9/15/2003 -0700, you wrote:

Guys,
 
I'm in the process of pulling the housings off of my 20B.
I have Bruce Turrentine's video and I knew it would be a little different from a 13B.
I got the rear side housing, rear rotor housing and rotor off, but I cant seem to find the  way to get the next side housing off. I tried the method as shown in the video. I've lifted the shaft but the housing but it doesnt want to move toward the eshaft so I can rotoate it off.
Anyone know the method for a 20B?
Thanks,
Wade Bush