Serious engine damage will result If the engine Is started before the lubrication system Is
properly filled and primed. Elapsed time between priming the lubrication system and starting
the engine shall not exceed 3 hours. if, for whatever reason, the engine cannot be started
within 3 hours after priming the lubrication system, repeat the entire priming procedure just
prior to starting the engine .
(8) Prime lubrication system in accordance with the Operator and Organizational Maintenance Manual.
9-21. CONNECTING ROD BEARINGS REPLACEMENT.
General. Connecting rod bearing shell consists of two shells, an upper and lower. Both shells have oil holes and
grooves for lubrication, and new bearing shells are interchangeable between rod and cap. If used rod bearing
shells are serviceable, however, they must be replaced in the same connecting rod and in the same cap from
which they were removed.
Inspect. Inspection of the connecting rod bearing shell is accomplished during the replacement procedure in
accordance with step d, below.
The following procedures are for replacing the connecting rod or main bearing shells without
removing the connecting rods or crankshaft. If the engine is undergoing overhaul, the
cylinder block should be completely disassembled in accordance with paragraph 9-31
Remove the inspection covers in accordance with paragraph 9-37.
With the crankshaft at BDC, loosen the connecting rod bolts (1, Figure 9-24), and tap the ends of the bolts
with a plastic mallet to free the rod cap (3) from the dowels (12).
Remove the bolts (1), washers (2), and remove the connecting rod cap (3). Slip the connecting rod
bearing shell (11) from the cap.
Install guide pins 3375098 in the connecting rod (4), and use a wooden block to tap the connecting rod
away from the journal far enough to remove the bearing shells (11). Slip the bearing shells from the
Mark the bearing shells (11) with a felt pen as to rod or cap and connecting rod number, and then tape
together to prevent a mix-up.
Remove the bearing shells (11) from the other connecting rod on the same crankshaft journal in
accordance with steps (2) through (5), above.
To avoid serious crankshaft damage, do not rotate the crankshaft when the connecting rods
are disconnected. Install the bearing shells In both connecting rods on each crankshaft
journal before proceeding to the next journal.
d. Clean and Inspect.
Dry cleaning solvent PD-680, Type III, or equivalent, is flammable and moderately toxic to the
skin, eyes, and respiratory tract. Assure adequate ventilation. Skin, eye, and respiratory
protection Is required to avoid Injury to personnel.
Being careful not to mix or interchange the bearings shells (11) clean each bearing shell in filtered solvent
PD-680, Type II, or equivalent, and dry carefully.