Figure 7-17. Connecting Rod and Bushings

Figure 7-15. Crankshaft Pistons and Connecting Rod (Sheet 2 of 2) - TM-5-6115-584-34_120

Figure 7-18. Connecting Rod Installation

TM-5-6115-584-34 Generator Set Diesel Engine Driven Tactical Skid Mtd. 30 Kw 3 Phase 4 Wire 120/208 and 240/416 Volts Manual
Page Navigation
90

TM 5-6115-584-34 NAVFAC P-8-622-34 TO-35C2-3-456-2 TM-0568C-34 If pin is excessively loose, install a new piston and pin assembly. NOTE Piston and pins are matched sets and are not procured separately. (3) Rings. Place each piston ring into its cylinder bore and using a feeler gauge measure gap dimensions. Gap is shown in Table l-2. If gap is under 0.010 inch, file as follows: (a) Place file in vise. (b) Grasp piston ring in both hands. (c) Insert file into ring gap and move ring down the entire length of file. Be sure to apply equal pres- sure on the ring. (4) Connecting Rods (see figure 7-17). Clean connecting rods and check for each defects. Check connecting rod bushings for proper clearance with piston pin. Clearance is given in Table 1-2. If bushings (13, figure 7-14) are excessively worn, press them out and install one new bushing from each side of bushing bore. Press new bushings only until flush with sides of rod to leave 1/16 to 7/64 inch oil groove in center. Ream bushing I.D. to obtain the proper clearance. Check bore in connecting rod. Bore must be open. Check connecting rod alignment on a standard align- ment fixture. Figure 7-17. Connecting Rod and Bushings (5) Connecting Rod Bearings (see figure 7-17). Inspect connecting rod bearings for burrs, breaks, pits and wear. Measure clearance between bearings and crankshaft journal. See Table 1-2 for clearance. If necessary, repiace with new standard or undersize precision bearings. e. Assembly (see figure 7-14). NOTE The piston witness mark (notch) must face front of engine and rod witness marks (num- bers) must face toward camshaft side of en- gine. (1) Install connecting rods (12, figure 7-14) on each piston (7) with pins (6) and retaining rings (5). If new bushings (13) were installed, check to see that ends are flush with the connecting rod (12) to provide for oil recess in the center. (2) Install rings and oil ring expander (1, 2, 3 and 4) on each piston (7). Compression rings will be marked TOP or identified in some other manner. Place this mark toward the closed end of piston. Space ring gaps 1/4 of the way around piston from one another. No gap should be in line with piston pin. Oil the rings (1, 2 and 4) and pistons (7). NOTE When installing old bearings make sure they are installed in the same position they were removed from. (3) Position a bearing half (11) in connecting rod (12) and cap (10). Be sure there is no dirt under bear- ing. This could cause high spots and early bearing failure. f. Install. (1) Hone cylinder walls. Clean and oil the cylin- der walls. Install each piston in proper cylinder using a suitable installer. Each piston assembly should be installed with notch on piston toward front of engine. The notch on the circumference of the closed end of the piston should be located closest to front of engine. (2) Position each connecting rod on crankshaft and oil the journal and install rod cap with bearing half. When installing rod cap, position so raised wit- ness mark on the forging matches the mark on con- necting rod. See figures 7-17 and 7-18. The piston witness mark should face front and rod witness marks toward camshaft side of engine. (3) Tighten capscrews to specified torque. See table 1-1. (4) Turn engine over by hand to see that all bearings are free. 7 - 18

Privacy Statement
Press Release
Contact