https://www.marinepartseurope.com/en/volvo-penta-explodedview-7744470-44-7642.aspx
First off, full disclosure! I'm not a marine mechanic, heck I'm not any kind of a mechanic and I'm certainly not a Volvo expert! But... I do own a 270 Volvo Penta outdrive that I have taken apart twice now.
1st time was with a marine mechanic buddy and the 2nd time was by myself.
Remove drive from boat and set in some sort of holding device. I used sawhorses with 2x10 planks and then a couple pieces of plywood across the flat thingy ma jiggy part to hold every thing steady
Yes, take those 4 bolts out part #16. You might have to take a rubber mallet and tap on #12 the bearing box (double bearing box). There will be very thin shims behind it, # 19 make sure you dont lose these. They obviously need to go back in.
Remove # 30 screw. I believe your manual should say that this screw should be replaced with a new screw.
Now you can remove the u-joint/drive to work on it much easier.
Re and re the c-clips, needle bearings, spiders etc.
There is a seal in there #20 that you may want to change while you are in there
Obviously you need new O-rings. Grease or oil before installing these. Sorry for stating the obvious
Put everything back together slowly and methodically. Follow instructions in manual carefully and everything should be fine.
Follow good mechanical procedures. I.E . clean all threads carefully. Chase all bolt holes with a thread chaser and lubricate with oil and blow out with compressed air. Keep work area clean. You know all the common sense stuff.
DON'T RUSH!
Don't be an animal and start beating on things. Bad idea. These are finely machined parts you are working with.
There should be no need to be checking any rolling torque. I think you are misunderstanding something
Not sure what crush bushing you are talking about. Again I think you are misreading something.
Replace the U-joint bellows while you are at it.
Good luck!