TM 10-4320-344-244.4.15 PistonandConnectingRodAssemblyMaintenance.Models609-CandUS636HCCD-1. (Continued)All components not meeting the dimensions specified in the inspectionprocedure are defective.n.Replace all defective or damaged components4.4.15.3 Installation.a .Install new upper bearing (Figure 4-25, 8) in connecting rod (4) bore.b .Lightly coat upper bearing (8) and crankshaft journal with engine assemblygrease.Ensure proper piston and connecting rod assemblies are used in the properc y l i n d e r s.c .Position connecting rod (4) and upper bearing (8) on crankshaft journal.d .Lightly coat crankshaft journal and lower bearing (7) with engine assemblygrease.e .Insert lower bearing (7) in connecting rod cap (6).f .Position connecting rod cap (6) on connecting rod (4) and install cap screws( 5 ).Torque cap screws to 22 ft-lbs (30 N•m).g.Using angle-of-turn indicator, tighten cap screws 60° first stage, then 30°second stage.h.Install expander spring in bottom ring groove on piston (1).Do not spread rings anymore than necessary to slip them over piston. Ringscould be over-stressed and break.i .Install four new piston rings (9). Start at bottom ring groove on piston (1).and work towards top of piston (1). Space end gaps of piston rings (9) evenlyaround piston (1).j .Insert one retaining ring (2) in groove in piston pin bore of piston (1).Use extreme caution when handling heated components. Heated compnonents cancause severe burns.k.Using piston heater (Figure 4-24, 1), heat piston (Figure 4-25, 1) to 176° F(80° C).l .Install piston (1) on connecting rod (4). Ensure arrow on top of piston (1)is pointing toward pushrod bores in crankcase.m.Insert piston pin (3) into piston pin bore of piston (1). Piston pin mustcontact retaining ring (2) installed in step j above.n.Install second retaining ring (2).4-54NOTENOTE
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