Yanmar 6LY3 series - Page 68

ENGINE
5-2 6LY3 Service Manual
© 2007 Yanmar Marine International
Removing the Oil Pump .......................................................... 5-21
Removing the Main Bearing Bolts ........................................... 5-21
Disassembling the Crankshaft and Piston Assemblies ........... 5-21
Inspecting the Cylinder Block and Components............................ 5-22
Inspecting Oil Passages and Freeze Plugs............................. 5-22
Dye Penetrant Inspection Procedure ...................................... 5-22
Replacing Freeze Plugs .......................................................... 5-23
Fabricating a Freeze Plug Driver............................................. 5-24
Measuring the Cylinder Bores ................................................. 5-24
Cylinder Head Components and Functions............................. 5-26
Inspecting the Cylinder Head .................................................. 5-28
Inspecting the Pistons and Piston Pins ................................... 5-36
Inspecting the Connecting Rods ............................................. 5-41
Inspecting the Crankshaft........................................................ 5-44
Inspecting the Camshaft and Tappets..................................... 5-48
Inspecting the Tappets ............................................................ 5-50
Inspecting the Push Rods ....................................................... 5-51
Inspecting the Timing Gear ..................................................... 5-51
Inspecting the Idler Gear ......................................................... 5-51
Indexing the Gear Timing Marks ............................................. 5-52
Inspecting the Flywheel and Housing...................................... 5-53
Replacing the Ring Gear ......................................................... 5-53
Positioning Top Dead Center .................................................. 5-53
Inspecting the Intake / Exhaust System .................................. 5-54
Assembling the Engine and Components ..................................... 5-55
Precautions Before Assembling the Engine ............................ 5-55
Installing the Tappets .............................................................. 5-55
Installing the Piston Cooling Nozzles ...................................... 5-56
Installing the Camshaft Bearings............................................. 5-56
Installing the Crankshaft.......................................................... 5-57
Installing the Oil Pump ............................................................ 5-58
Installing the Drive Shaft Housing ........................................... 5-59
Installing the Camshaft............................................................ 5-59
Installing the Piston Assemblies.............................................. 5-59
Installing the Oil Pan Spacer ................................................... 5-60
Installing the Oil Intake and Delivery Tubes ............................ 5-60
Installing the Oil Pan ............................................................... 5-61
Installing the Flywheel Housing Oil Seal ................................. 5-61
Installing the Flywheel Housing............................................... 5-61
Installing the Seawater Pump.................................................. 5-62
Installing the Idler Gear ........................................................... 5-62
Installing the Oil Pressure Regulating Valve ........................... 5-63
Installing the Coolant Passage Cover ..................................... 5-63
Installing the Fuel Injection Pump ........................................... 5-63
Installing the Flywheel ............................................................. 5-63
Installing the Cylinder Head Assembly.................................... 5-64
Installing the Intercooler .......................................................... 5-65