TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
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(b) Coat pistons with lubriplate or engine oil and stagger the four piston ring gaps 90 degrees apart. (2) Cylinder assemblies. Note. For instructional purposes, the in- stallation of only one cylinder assembly is described. The remaining cylinder assemblies should be installed in the same manner. Note. Wash cylinder bores thoroughly just prior to engine assembly, using a power brush with hot (160 F) soap water. Cylinder bores should then be oiled to prevent rust. (a) Rotate engine overhaul stand until right bank cylinder holes, with connecting rod protectors, are positioned to receive cylinder Nos. 1R through 6R. (b) Install piston with rings in cylinder and cylinder assemblies on crankcase following instructions which accompany figures 7-12 and 7-13. 1. Install piston and rings (A) in cylinder assembly using compressor and gage-4910-795-7956. The piston position number (fig. 7-11) must always correspond to the cylinder number marked on intake valve side of valve rocker arm cover flange. The arrow on the piston boss must he directed toward the exhaust port outlet. Guide piston and rings into cylinder until all piston rings have entered the cylinder bore. Slide the com- pressor from piston and ring assembly. Install remaining pistons in cylinders in the same manner. 2. Install new preformed packing (B) on each cylinder base making sure that packing is not twisted or otherwise improperly seated. Figure 7-12. Installing piston in cylinder assembly using compressor and gage-4910-795-7956. 7-9