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Are you paying for this out of your pocket?
If not, have your engine rebuilt. There have been unpleasant reports about poorly rebuilt engines (rebuilt by the low bidder) coming from manufacturer's "factory remanufactured" programs (Volvo & others).
If you are paying for it, here's what I would do:
1. Have the tech visually examine the cylinder bores, as best he can, from underneath, to see if there is any obvious damage.
2. Have them Plastigage (measure) the main & rod bearing clearances.
3. If there is no obvious damage to the cylinder bores, remove the cylinder head and use measuring tools to determine if there is any wear or damage to the cylinder bores. Remove the connecting rods & pistons and measure the condition of the crankshaft journals. If the cylinder bores are OK (possible) and the crankshaft journals are OK (possible but unlikely), replace the bent rod with one which has been selected to weigh the same as the other rods, and replace the piston from the bent rod, if necessary. If you can afford it, replace the rings on all 5 cylinders (& hone the cylinders).
4. If there is damage to the crankshaft, it will have to be reground, which will require removing the transmission. If they are doing this much work, they will also be pulling the engine completely out of the car. At this point you should probably do a complete rebuild on the short block. If you can afford it, you might as well do a valve job too, and you will have a completely rebuilt engine.
I guess my point is, have them inspect to see if the problem can be fixed with a new rod, rod bearings & maybe one piston, but without completely removing the engine, before you agree to a complete overhaul.
Oh yes, they should also inspect for why the rod problem happened. (Oiling system failure? Hydraulic lock on that cylinder?)
If you want to go the used engine route, there is a '96 850R at Sawmill Auto Wreckers in Yonkers, NY (800)227-1111
and a '97 850 T5 at Walt Erickson Used Cars in Centralia, MO (573)628-5010
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