Removing The Valves; Valves And Valve Guide Inspection - Yamaha FZ-16 Service Manual

REMOVING THE VALVES

The following procedure applies to all
valves and related components.
NOTE:
Before removing the internal parts of the head
(For example, valves, valve springs,
valve seats), make sure the
valve seal well.
1.
Check:
•
Sealing valves
Leaking check valve seat
face of the valve, valve seats, and
the width of the valve seat.
See "VERIFICATION
VALVE SEATS "on page
5-17.
a.
Pour a clean solvent "to" on ports
Input and Output
b.
Check valve seal
NOTE:
There is no leakage in the seat
Valve "1".
2. Remove:
•
Valve pin "1".
NOTE:
Remove pin compressing the valve
valve spring with the spring compressor
valve and the adapter compressor
Valve spring "2"
Valve spring compressor
YSST-603
Spring compressor adapter
Valve
YSST-803 A
3.
Remove:
•
Upper spring seat valve "1"
•
Valve spring "2"
•
Valve "3"
•
Stem seal valve "4"
•
Lower spring seat valve "5"
VALVES AND VALVE SPRINGS
NOTE:
Identify the position of each part with much
care that can be reinstalled in their
original place.
INSPECTION AND VALVES
VALVE GUIDES
The following procedure applies to all
valves and valve guides.
1. Measure:
• clearance between the valve stem and the
Valve guides
Out of specification Replace the stock
• clearance between the valve stem and the
Valve guides
valve guide "a" - shank diameter
Valve "b"
2
1
Clearance valve and valve guide = a-b
5-16
= Inner diameter
Clearance between the stem
valve and the valve guide
(Admission)
0010-0037 mm
Limit
0,080 mm
Clearance between the stem
valve and the valve guide
(Escape)
0025-0052 mm
Limit
0.100 mm