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Hi Mark,
I know you've been successful with many other repairs, so you will be with this one too. My first Volvo water pump replacement held up for about 15 minutes, and that was just how long it took for me to become aware something was wrong. I brought 30 years of DIY maintenance experience to the task but still managed to screw up this first of our Volvos by slicing the heater return pipe o-ring. My mistake was putting the o-ring into the pump first, rather than lube it some and put it on the pipe first. It put a crimp on starting an 800 mile road trip while I had to buy an aftermarket pump locally on a Saturday, just to get the square o-ring.
My second water pump mistake a few years later on another B23 didn't show itself for 20K miles, and when it did, it was near the end of a similar 800 mile trip. I had coated the paper gasket both sides with RTV instead of leaving it dry as I have since then. When the gasket failed, I needed a tow. The thinnest part of it had "squirted" out from under the pump, seemingly because of the use of the RTV in its uncured state when the gasket was first installed.
Undoubtedly you've read of the necessity to lever the pump to compress the top donut seal to the head. I now use the method Dave (Volvo from Heck) suggested in a post here - a #1 Phillips in a lower mounting hole gives you all the control you need to lever the pump toward the head.
Here's a side-by-side comparison of two pump brands I posted last year: http://cleanflametrap.com/wasserpumpen.html
I'm confident you'll do fine.
--
Art Benstein near Baltimore
When fish are in schools they sometimes take debate.
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