Thanks all for the responses. While I still do not have a torque spec for the 4 bolts that hold the oil pump together, I think I have a path to figuring one out. The oil pump is still sitting in my parts washer, and hope to look at it in the next couple days. If the end play is near the upper limit, I was planning on replacing the pump anyway. 142guy, it is possible a piece of crud got into the check valve and fell out when you disassembled the pump. I have had similar experiences before. Did not realize the reinforcing collar from IPD was such a tight fit, and can see how that could accelerate wear. Guess I will not bother with putting a collar on. My engine has about 138,000 miles on the clock, so the pump should be okay. But, an inspection will tell. I can get a real Volvo pump for just over $100, which is not too much coin. Got the recent estimate from the body and paint shop, which is higher than planned thanks to inflation over the past year and difficulty in finding good body guys. So, I am looking for ways of limiting costs. But, if there is any question about the oil pump, it will be replaced.
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Gary D