TM 10-3930-660-34 3-8. CRANKSHAFT - REPLACE/REPAIR (Cont’d) CAUTION Use only nylon straps, or equivalent, to install crankshaft into cylinder block.  Be sure that nothing metallic comes in contact with the machined surfaces of the crankshaft.  A scratched or damaged crankshaft could cause premature engine failure. c. Attach nylon or equivalent straps to the crankshaft. d. Attach lifting straps to a suitable hoist.  Slowly and carefully move crankshaft from the engine stand to the cylinder block. e. Slowly lower crankshaft into cylinder block.  Be careful not to scratch the crankshaft journals. f. Check that the crankshaft gear-to-camshaft gear timing marks are aligned.  Allow crankshaft to firmly rest against the upper main bearing halves. g. Place new lower bearing halves (15) in bearing caps (13) with bearing tab in groove of cap. h. Place a piece of plastigage on the surface of each lower main bearing half (15). 3-59