TM 10-3930-659-34 5-1. ENGINE BLOCK MAINTENANCE (Con’t). 19. Torque 14 screws (16 and 20) to 85 lb.-ft.  (115 N-m). NOTE Use bolt removed from crankshaft dampener to perform step 20. 20. Install  bolt  (21)  on  crankshaft  (22)  and  turn  crankshaft  two  full  revolutions.    Crankshaft  must  turn  freely.    If crankshaft does not turn freely, replace engine block (1). 21. Remove bolt (21) from crankshaft (22). 22. Remove two screws (20), washers (19), and thrust bearing cap (18) from engine block (1). 23. Remove lower thrust bearing (24) from thrust bearing cap (18). 24. Remove 12 screws (16), washers (15), and six main bearing caps (14) from engine block (1). 25. Remove six lower main bearings (23) from main bearing caps (14). WARNING Use extreme caution when handling heavy parts.  Lifting device is required when parts weigh over 50 lb (23 kg) for a single person lift, over 100 lb (45 kg) for a two person lift, and over 150 lb (68 kg) for a three or  more  person  lift.    Keep  clear  of  heavy  parts  supported  only  by  lifting  device.    Failure  to  follow  this warning may cause serious injury or death to personnel. CAUTION Ensure that crankshaft is lifted straight out of engine block.  Crankshaft hitting against engine block may damage parts. 26. Using suitable lifting device, remove crankshaft (22) from engine block (1). 27. Remove six upper main bearings (26) and upper thrust bearing (25) from engine block (1). 28. Using inside caliper micrometer, measure inside diameter of control cam bores (27). Measurement  must  be  1.248-1.250  in.    (3.170- 3.175cm).        If    measurement    is    greater    than specification, replace engine block (1). 5-8