BRP Johnson 4HP Service Manual page 75

POWERHEAD
CONTENTS
REMOVAL ................................................................................................................................................ 6-2
INSTALLATION ........................................................................................................................................ 6-5
DISASSEMBLY ........................................................................................................................................ 6-7
OIL FILTER / OIL PUMP
INTAKE MANIFOLD / THERMOSTAT
CYLINDER HEAD / VALVE / ROCKER ARM
CYLINDER / PISTON / CRANKSHAFT / CONROD / CAMSHAFT ......................................................... 6-9
INSPECTION AND SERVICING ............................................................................................................. 6-11
................................................................................................................................ 6-11
CYLINDER HEAD
VALVE / VALVE GUIDE ......................................................................................................................... 6-12
VALVE SEAT SERVICING
VALVE GUIDE REPLACEMENT
VALVE SPRING ..................................................................................................................................... 6-18
CAMSHAFT ............................................................................................................................................ 6-19
CYLINDER / PISTON / PISTON RING ................................................................................................... 6-21
PISTON PIN / CONROD / CRANKSHAFT ............................................................................................. 6-26
OIL SEAL / BEARING ............................................................................................................................ 6-30
THERMOSTAT ....................................................................................................................................... 6-32
REASSEMBLY ....................................................................................................................................... 6-33
PISTON TO CONROD
PISTON RING TO PISTON
CRANKSHAFT AND PISTON TO CYLINDER
.................................................................................................................................... 6-35
CONROD CAP
CAMSHAFT TO CYLINDER
CRANKCASE TO CYLINDER
CYLINDER HEAD / VALVE
CYLINDER HEAD TO CYLINDER
PIVOT NUT / ROCKER ARM / VALVE CLEARANCE
CYLINDER HEAD COVER
INTAKE MANIFOLD / THERMOSTAT
OIL PUMP / OIL FILTER
OPERATION ........................................................................................................................................... 6-40
WATER COOLING SYSTEM
ENGINE LUBRICATION SYSTEM
NOTES .................................................................................................................................................... 6-42
......................................................................................................................... 6-7
...................................................................................................... 6-7
............................................................................................. 6-7
.................................................................................................................... 6-16
............................................................................................................ 6-17
.......................................................................................................................... 6-33
.................................................................................................................... 6-34
.......................................................................................... 6-35
.................................................................................................................. 6-36
................................................................................................................ 6-36
................................................................................................................... 6-37
.......................................................................................................... 6-38
.................................................................................................................... 6-39
.................................................................................................... 6-39
....................................................................................................................... 6-39
................................................................................................................. 6-40
.......................................................................................................... 6-41
................................................................................ 6-38
POWERHEAD
CONTENTS
6-1