Checking, Machining Cylinder Head Contact Surface
PRECEDING WORKValves removed.
OVERVIEW
Reference size (H):
Measure and note.
Cylinder head contact surface:
Face, pay attention to note.
Sharp edges at edge of combustion chamber
Deburr.
Valves (42) and (43)
Insert.
Reference dimensions (T) between end of valve stem and base of camshaft bearing:
Measure; insert 6 mm diameter round bar into base of camshaft bearing as measuring aid.
Valve Seats:
Machine according to stock removal at cylinder head.
DATA IN MM
COMMERCIALLY AVAILABLE TOOLS
NOTE:
Machine cylinder head contact surface only if porous or damaged points exist or if an impermissible difference from the flatness in the longitudinal direction is measured.
The top cylinder head contact surface must not be machined as otherwise the bearing bores of the camshaft bearings will be altered.
If cracks are suspected (internal loss of coolant), the cylinder head must be pressure-tested.