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Many thanks for the reply Jerry.
I did subsequently find the timing marks on the crankshaft after calling an independent Volvo shop that I found on the internet (www.volvohelp.com). The owner John Brederson (Master Volvo Technician) was very gracious and explained everything to me. I can't thank him enough for his time and advice!
Turns out that on my engine there is a raised "nub" on the timing belt pulley on the crankshaft. This nub is the timing mark. The reason I couldn't find it is because it is hidden from view under the serp belt pulley...you can't see it unless that pulley is removed also. But once John explained where it was I felt for it with my finger, and sure enough, there it was. And exactly in line with the timing mark on the block (the "protuberance" on the left side that you mentioned.)
On my engine there is a vibration dampener that is held on by 4 bolts. This I removed in order to get the serp belt off. Under the dampener there is the serp belt pulley which I did not remove because it is held on by a large nut and you need some way to lock the crank to remove it, some special tool that I don't have. Or maybe an air gun would have taken it off but I don't have that either.
John also told me that it is IMPERATIVE that you use a cam lock tool. He said that the cam sprockets can move when you are removing the old/installing the new belt, and then you are in big trouble. I had purchased one made by Lisle, tool number 36880, but it turns out that it doesn't work on my particular engine. The way the cam sprockets are made there is nothing for the tool to grab onto. (Note for others reading this thread...it may work on other Volvo engines.)
So for all those reasons I decided to give up, and will take it to a shop to have the timing belt/tensioner/pulley installed. I have also read several horror stories on the Volvo boards of guys destroying their engines after not replacing the timing belt correctly. Mine is an "interference" engine which means the valves will hit the pistons if the cam timing is not 100% perfect. My engine is further complicated by something called VVT (Variable Valve Timing). If the VVT gets messed up by the cam sprockets moving even a little, it is a very complicated (and expensive) procedure to reset it that requires special tools.
But I'm glad you were able to do yours on your own and save some money. Thanks for the info.
G Squared
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2001 S80 2.9 (non-turbo), 113K miles
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