TM 9-6115-604-34NAVFAC P-8-633-34CAUTIONSerious engine damage will result If the engine Is started before the lubrication system Isproperly filled and primed. Elapsed time between priming the lubrication system and startingthe engine shall not exceed 3 hours. if, for whatever reason, the engine cannot be startedwithin 3 hours after priming the lubrication system, repeat the entire priming procedure justprior to starting the engine .(8) Prime lubrication system in accordance with the Operator and Organizational Maintenance Manual.9-21. CONNECTING ROD BEARINGS REPLACEMENT.a.General. Connecting rod bearing shell consists of two shells, an upper and lower. Both shells have oil holes andgrooves for lubrication, and new bearing shells are interchangeable between rod and cap. If used rod bearingshells are serviceable, however, they must be replaced in the same connecting rod and in the same cap fromwhich they were removed.b.Inspect. Inspection of the connecting rod bearing shell is accomplished during the replacement procedure inaccordance with step d, below.c.Remove.NOTEThe following procedures are for replacing the connecting rod or main bearing shells withoutremoving the connecting rods or crankshaft. If the engine is undergoing overhaul, thecylinder block should be completely disassembled in accordance with paragraph 9-31(1)Remove the inspection covers in accordance with paragraph 9-37.(2)With the crankshaft at BDC, loosen the connecting rod bolts (1, Figure 9-24), and tap the ends of the boltswith a plastic mallet to free the rod cap (3) from the dowels (12).(3)Remove the bolts (1), washers (2), and remove the connecting rod cap (3). Slip the connecting rodbearing shell (11) from the cap.(4)Install guide pins 3375098 in the connecting rod (4), and use a wooden block to tap the connecting rodaway from the journal far enough to remove the bearing shells (11). Slip the bearing shells from theconnecting rod.(5)Mark the bearing shells (11) with a felt pen as to rod or cap and connecting rod number, and then tapetogether to prevent a mix-up.(6)Remove the bearing shells (11) from the other connecting rod on the same crankshaft journal inaccordance with steps (2) through (5), above.CAUTIONTo avoid serious crankshaft damage, do not rotate the crankshaft when the connecting rodsare disconnected. Install the bearing shells In both connecting rods on each crankshaftjournal before proceeding to the next journal.d. Clean and Inspect.WARNINGDry cleaning solvent PD-680, Type III, or equivalent, is flammable and moderately toxic to theskin, eyes, and respiratory tract. Assure adequate ventilation. Skin, eye, and respiratoryprotection Is required to avoid Injury to personnel.(1)Being careful not to mix or interchange the bearings shells (11) clean each bearing shell in filtered solventPD-680, Type II, or equivalent, and dry carefully.9-58
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