8 months later, sigh, ready to hit it again. Good thing I took lots o' pics. Reviewed previous work while at breakfast.. Now to go home and get something done..New O-Ring from www.z1300.de
Fits water pump shaft.
Cleaned both surfaces with lacquer thinner and clean rag.
Lightly coated with Lubriplate 'cream' for initial start-up.
Impeller installed. New circlip too. Used a wedge to keep impeller 'seated enabling access to circlip groove.
No replies in 21 hours- No surprise. I thought I would leave it alone and let someone else weigh in. I guess not.
Lubriplate on the seal face? No, no, no. The rule of thumb is to lubricate moving parts in a component with either the lubricant that lubricates the moving item when the machine is running which in this case is the coolant in the system. Static o rings can be lubricated with o ring lube for installation and it's a must. If you don't lubricate the o ring, as it's installed, it deforms and it needs the lubrication to allow the o ring to naturalize in the groove after being squeezed in to position.
Thermostat and housing first since you need the room to install the thermostat, gasket , spring and housing and hold in position while you install the 2 screws.
water pump to follow and ensure that you install the tube in the housing and leave the circlip loose up the tube until after the housing is tightened down, then slip the tube up into the thermostat housing and install the circlip.
(and all of this is detailed in the FSM page 62, 63 including the requirement to lubricate the seal face with coolant)