Rotax 915 i A series Maintenance Manual page 187

TOPICS IN THIS CHAPTER
Special tools............................................................................................................................................4
Service products .....................................................................................................................................5
System description .................................................................................................................................7
Safety instruction...................................................................................................................................7
Maintenance .........................................................................................................................................7
Cylinder head ..........................................................................................................................................8
Cylinder head - removal.......................................................................................................................8
Removal of surrounding assemblies .......................................................................................................8
Cylinder head - removal.....................................................................................................................10
Disassembly..........................................................................................................................................12
Disassembling the cylinder head ..........................................................................................................12
Rocker arm - removal ........................................................................................................................12
Valve - removal .................................................................................................................................12
Coolant elbow inlet - removal .............................................................................................................13
Removal of the oil return tube ...............................................................................................................13
Coolant elbow outlet - removal ...........................................................................................................13
Inspection .............................................................................................................................................15
Cylinder head single parts check ..........................................................................................................15
Cylinder head studs check ...................................................................................................................15
Cylinder head assy. - inspection .........................................................................................................15
Hardness test method ...........................................................................................................................17
Valve guide check................................................................................................................................17
Valve check ........................................................................................................................................18
Valve seats check................................................................................................................................18
Valve spring check...............................................................................................................................19
Washer check .....................................................................................................................................19
Rocker arm check and rocker arm shaft check.......................................................................................20
Rocker arm bushing ............................................................................................................................21
Push rods ...........................................................................................................................................21
Wear limits ............................................................................................................................................22
Assembly ..............................................................................................................................................27
Cylinder head - assembly...................................................................................................................27
Oil return tube installation.....................................................................................................................27
Installation of the coolant elbow inlet .....................................................................................................27
Coolant elbow outlet - assembly .........................................................................................................27
Coolant elbow - installation ................................................................................................................28
Valve installation .................................................................................................................................28
Rocker arm - installation ....................................................................................................................30
Installation.............................................................................................................................................31
Cylinder head installation .....................................................................................................................31
Cylinder head (single) repaired per engine side ....................................................................................33
Effectivity: 915 i A Series
Edition 0/Rev. 0
BRP-Rotax
MAINTENANCE MANUAL HEAVY
Chapter: 72-30-00
CYLINDER HEAD
72-30-00
Page 1
August 01 2018