Yamaha F20A Service Manual

E
POWR
OIL PUMP ...................................................................................................... 5-20
EXPLODED DIAGRAM ........................................................................... 5-20
REMOVAL AND INSTALLATION CHART ............................................. 5-20
SERVICE POINTS ................................................................................... 5-21
Cylinder head inspection ................................................................ 5-21
Oil pump inspection........................................................................ 5-21
CAMSHAFT AND VALVES ........................................................................... 5-22
EXPLODED DIAGRAM ........................................................................... 5-22
REMOVAL AND INSTALLATION CHART ............................................. 5-22
SERVICE POINTS ................................................................................... 5-24
Valve inspection .............................................................................. 5-24
Valve spring inspection .................................................................. 5-25
Rocker arm and rocker arm shaft inspection ................................ 5-26
Camshaft inspection ....................................................................... 5-26
Valve guide replacement ................................................................ 5-27
Valve installation ............................................................................. 5-27
Valve seat refacing .......................................................................... 5-28
Valve seat cutting guidelines ......................................................... 5-28
OIL FILTER CARTRIDGE, THERMOSTAT, AND EXHAUST COVER .......... 5-30
EXPLODED DIAGRAM ........................................................................... 5-30
REMOVAL AND INSTALLATION CHART ............................................. 5-30
SERVICE POINTS ................................................................................... 5-32
Thermostat inspection .................................................................... 5-32
CRANKCASE, CRANKSHAFT ASSY., AND CYLINDER BODY ................... 5-33
EXPLODED DIAGRAM ........................................................................... 5-33
REMOVAL AND INSTALLATION CHART ............................................. 5-33
SERVICE POINTS ................................................................................... 5-36
Cylinder inspection ......................................................................... 5-36
Piston inspection ............................................................................. 5-36
Piston-to-cylinder clearance ........................................................... 5-37
Piston pin inspection....................................................................... 5-37
Piston ring inspection ..................................................................... 5-37
Crankshaft inspection ..................................................................... 5-38
Main-bearing oil clearance ............................................................. 5-38
Big-end oil clearance....................................................................... 5-40
Piston ring installation .................................................................... 5-41
Piston installation............................................................................ 5-41
Oil seal installation.......................................................................... 5-42

Yamaha F20A Specifications

General

Brand	Yamaha
Model	F20A
Category	Outboard Motor
Language	English