Kubota ,RCK60B-23BX Workshop Manual Download

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5. Disassembling and assembling ..............................................................................................................3-38

5.1 Separating engine ...........................................................................................................................3-38

5.1.1 Draining engine oil ..................................................................................................................3-38
5.1.2 Removing battery....................................................................................................................3-38
5.1.3 Removing bonnet....................................................................................................................3-39
5.1.4 Disconnecting wiring harness and ground cables ..................................................................3-40
5.1.5 Disconnecting fuel hoses........................................................................................................3-40
5.1.6 Disconnecting accelerator wire...............................................................................................3-41
5.1.7 Disconnecting propeller shaft assembly .................................................................................3-41
5.1.8 Separating engine...................................................................................................................3-41
5.1.9 Draining coolant and removing outer engine parts .................................................................3-42

5.2 Disassembling engine .....................................................................................................................3-43

5.2.1 Cylinder head and valve .........................................................................................................3-43
5.2.2 Gear case and timing gears....................................................................................................3-47
5.2.3 Piston and connecting rod ......................................................................................................3-51
5.2.4 Flywheel and crankshaft .........................................................................................................3-53

6. Servicing.................................................................................................................................................3-55

6.1 Cylinder head and valve..................................................................................................................3-55

6.1.1 Checking top clearance ..........................................................................................................3-55
6.1.2 Checking cylinder head surface flatness ................................................................................3-55
6.1.3 Checking cylinder head flaw ...................................................................................................3-56
6.1.4 Checking valve recessing .......................................................................................................3-57
6.1.5 Checking clearance between valve stem and valve guide ..................................................... 3-57
6.1.6 Replacing valve guide.............................................................................................................3-58
6.1.7 Checking valve seating...........................................................................................................3-58
6.1.8 Correcting valve......................................................................................................................3-59
6.1.9 Correcting valve seat ..............................................................................................................3-59
6.1.10 Lapping valve........................................................................................................................3-60
6.1.11 Checking free length and tilt of valve spring .........................................................................3-60
6.1.12 Checking valve spring setting load .......................................................................................3-60
6.1.13 Checking oil clearance between rocker arm and rocker arm shaft....................................... 3-61
6.1.14 Checking push rod alignment ...............................................................................................3-61
6.1.15 Checking oil clearance between tappet and tappet guide bore ............................................ 3-62

6.2 Timing gears, camshaft and governor gear.....................................................................................3-62

6.2.1 Checking timing gear backlash...............................................................................................3-62
6.2.2 Checking idle gear 1 side clearance.......................................................................................3-63
6.2.3 Checking camshaft side clearance .........................................................................................3-63
6.2.4 Checking camshaft alignment.................................................................................................3-64
6.2.5 Checking cam height ..............................................................................................................3-64
6.2.6 Checking oil clearance of camshaft journal ............................................................................3-64
6.2.7 Checking oil clearance between idle gear 1 shaft and idle gear bushing ............................... 3-65
6.2.8 Replacing idle gear bushing ...................................................................................................3-66

6.3 Piston and connecting rod...............................................................................................................3-66

6.3.1 Checking piston pin bore I.D...................................................................................................3-66
6.3.2 Checking oil clearance between piston pin and small end bushing........................................ 3-66
6.3.3 Replacing small end bushing..................................................................................................3-67
6.3.4 Checking connecting rod alignment........................................................................................3-67
6.3.5 Checking piston ring gap ........................................................................................................3-68
6.3.6 Checking clearance between piston ring and piston ring groove ........................................... 3-68

6.4 Crankshaft.......................................................................................................................................3-69

crankshaft bearing 3 ..............................................................................................................3-74

6.5 Cylinder ...........................................................................................................................................3-76

Kubota ,RCK60B-23BX, Workshop Manual

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