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, repent the entire priming procedure just prior to starting the
Before starting the engine, fill and prime the lubrication system in accordance with the Operator and
Organizational Maintenance Manual.
9-28. CRANKSHAFT REBUILD.
General. No loss of strength occurs when a crankshaft is properly ground to a standard undersize. It is of
extreme importance, however, that the procedures set forth in this paragraph be adhered to as closely as
possible. The procedures must also be combined with good judgment and the common sense of the regrind
operator in order to produce a reconditioned crankshaft that is dependable. Successful rebuild of crankshafts is
dependent upon the following factors: (1) Adequate equipment, and personnel proficient in its use.
Thorough cleaning and inspection prior to rebuilding in order to eliminate those shafts that are damaged
beyond rebuilding capabilities
Adherence to rebuilding specifications and limits applying to inspection, alignment, straightening,
dimensions, surface finish, balance, and identification of undersizes.
Thorough cleaning after rebuilding operations.
If at any time during the following rebuilding procedures work Is suspended the crankshaft
must be stored In a vertical position. Do not allow the crankshaft to lie flat. Allowing the
crankshaft to lie flat with unsupported main bearing journals, may cause misalignment. The
only exception to this Is when the crankshaft Is mounted to a crankshaft grinding machine,
and the main bearing journals are supported by steady rests.
Before proceeding with disassembly, cleaning, and major inspection, perform a preliminary
inspection in accordance with paragraphs 9-21 and 9-22. If visible cracks are evident, or
journals are obviously damaged beyond rebuilding, discard the crankshaft.
If defective, remove the crankshaft gear in accordance with paragraph 9-18.
Remove the pipe plugs (1, Figure 9-38) from the crankshaft oil galleries.
Number and match-mark the counterweights (3) to the crankshaft so that they may be assembled in the
same position as removed.
Remove the capscrews (2), and remove the counterweights (3), using a soft hammer.