Hey JM, I"ve only worked on one 855 over the years but it appears like as long as the accessory drive is allowed to stay in place and just the compresso/fuel pump is pulled it shouldn"t be that big of a deal to get everything back right. It looks like all that there is is a splined connection between the omoressor and the drive assembly. That said, this is the proceedure straight from an 855 service manual. The first proceedure is used to get the accessory drive assembly in time when building the engine as it shows the timing marks lining up with the front cover off. I doubt this proceedure will be needed but here is is anyways.----------Bar engine to NO1 cylinder, TDC (firing stroke), continue to rotate 90 degrees ATC. In this position the two center punch marks on the drive gear will mesh/index with the two dash marks on the camshaft gear. This timing is required so the external timing marks on the accessory drive pulley will be properly aligned with the timing mark on the gear case to show valve and injector adjustment positions. Keyway of drive shaft will be at the top. Secure drive to cylinder block. ------------Proceedure #2. This for actually installing the Air compressor. Based on step one it looks like you need to time the engine first for this to work out right. That said here is the sequence listed in the book.-------For balance of the engine and air compressor reciprocating force the coupling driven air compressor must be timed to the engine firing order. 1-Bar engine to "A" or the "1-6" valve set mark. 2-Rotate air compressor crankshaft so timing mark or male splined coupling hald keyway will be pointing at "9:30 o"clock" when looking at coupling end of compressor. 3-assemble splined coupling to air compressor drive shaft. 4-With a new gasket in place install air compressor to accessory drive housing. Tighten capscrews to 40-45 ft lbs torque.
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