TM 10-3930-659-34 4-8. IDLER GEARS MAINTENANCE (Con’t). NOTE Perform steps 6 through 9 only if lower idler gearshaft was removed. 6. Install thrustwasher (3) on lower idler gearshaft (4). 7. Apply lubricating oil to lower idler gearshaft (4) and position lower idler gearshaft on cylinder block front plate (1). 8. Install washer (10) and screw (11) in cylinder block front plate (1) and lower idler gearshaft (4). 9. Install engine oil pan (see paragraph 4-17). 10. Using gear timing tool, aline timing marks on engine oil pump gear (9) and crankshaft (2). 11. Apply lubricating oil to lower idler gear (5). 4-42