Adjusting The Valve Clearance - Yamaha F225F Service Manual

Adjusting the valve clearance

Adjust the valve clearances when the engine
is cold.
1. Reduce the fuel pressure. See "Reducing
the fuel pressure" (6-6).
TIP:
When adjusting the valve clearances, the fuel
line must be disconnected. Therefore, make
sure to reduce the fuel pressure before per-
forming the disassembly procedure.
2. Disconnect the quick connectors. See
steps 2 and 3 in "Disconnecting the quick
connector" (6-6).
3. Remove the fuel hose (high-pressure).
4. Remove the wiring
"Removing the wiring harness" (7-18).
5. Remove the wiring harness guide a.
a
6. Remove the flywheel magnet, pulser coil,
and stator assembly. See "Removing the
flywheel magnet" (7-15).
7. Remove the intake manifold (STBD). See
"Removing the intake manifold" (6-15).
8. Remove the timing belt. See "Removing
the timing belt" (7-38).
harness. See
Power unit (check and adjustment)
9. Remove the VCT assemblies, driven
sprockets, and
"Removing the driven sprocket and
camshaft" (7-45).
TIP:
Make sure to keep the parts in the order of
removal.
10. Measure the valve lifter thickness a, and
then write down the measurement data.
11. Select the necessary valve lifter by
calculating its thickness
following formula.
Calculation formula:
Necessary valve lifter thickness = Removed
valve lifter thickness + Measured valve clear-
ance – Specified valve clearance
Example:
Removed valve lifter thickness = 3.000 mm
Measured valve clearance = 0.255 mm
Specified valve clearance = 0.205 mm
Necessary valve lifter thickness
= 3.000 mm + 0.255 mm – 0.205 mm
= 3.050 mm
12. Install the necessary valve lifter into the
cylinder head.
13. Install the camshafts, VCT assemblies,
and driven sprockets. See "Installing the
camshaft and driven sprocket" (7-48).
14. Install the timing belt. See "Installing the
timing belt" (7-39).
15. Measure the valve clearances. See steps
11–13 in "Checking the valve clearance"
(7-2).
camshafts. See
a
using the
7-4
0
1
2
3
4
5
6
7
8
9
10
A