As dirtmover notes it is possible for a serp belt to come loose in whole or in part and jam in such a way as to interfere with crank rotation enough to cause the timing belt to get off. Indeed it's even theoretically possible when that happens for the timing belt to strip enough teeth that the crank shaft and cams are no longer "connected" which clearly could result in a crank but no start.
Thoughts: 1. pm or email geordi as he is headed to points north of you soon and might could fit you in. Do not wait in hopes he sees this post. 2. when you replaced the alternator did you make absolutely sure it came with the appropriate decoupler pulley? 3. I've had a serp belt come off, not on the CRD, as a result of a bad tensioner so as part of whatever you do I'd replace the tensioner. 4. to the extent damage has been done a bit of extra cranking won't do any more so pop oil filler plug on top of the engine and shine a flashlight in there while someone briefly cranks the engine if the camshaft, which you can see thru that hole, does not rotate then the timing belts is busted or stripped. If it does rotate consider pulling the fan and shroud so you can get at the crank nut so you can rotate the engine manually, my main PC is down so I cannot double check rotation direction so best check FSM; pop the 2 bolts that close off the cam alignment holes; manually rotate the engine and see if you can get a cam alignment tool into both cam alignment holes at the same time (you are not setting timing just checking it so drill bits or allen keys can be used); if you cannot the engine is out of time.
_________________ Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs
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