Honda Crf250l Service Manual

9-8
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COOLING SYSTEM
WATER PUMP
MECHANICAL SEAL INSPECTION
Check the bleed hole [1] of the water pump for signs of
coolant leakage.
If water leaks through the bleed hole, replace the
mechanical seal (page 9-9).
If oil leaks through the bleed hole, replace the oil seal
(page 9-9).
Make sure that there are no continuous coolant leakage
from the bleed hole while operating the engine.
A small amount of weeping from the bleed hole is
normal.
REMOVAL
Drain the coolant (page 9-5).
Remove the...

9-9
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COOLING SYSTEM
Check the water pump shaft [1] for wear or damage,
replace it if necessary.
BEARING/MECHANICAL SEAL/OIL 
SEAL REPLACEMENT
Remove the water pump shaft bearings [1] using the
special tools.
[1]
MECHANICAL SEAL
OIL SEAL
BEARINGS
TOOLS:
[2] Remover weight 07741-0010201
[3] Bearing remover set, 12 mm 07936-1660101
[1]
[2]
[3] 

9-10
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COOLING SYSTEM
Remove the mechanical seal [1] and oil seal [2] from
the right crankcase cover.
Apply grease to a new oil seal [1] lips.
Install the oil seal to the right crankcase cover as
shown.
Drive in a new
bearing squarely
with the marking side facing up.Drive in new bearings [1] into the right crankcase cover
using the special tools as shown.
After installing the bearing, lubricate it with engine oil.
Press a new mechanical seal [1] until it is fully seated to
the right...

9-11
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COOLING SYSTEM
INSTALLATION
Apply engine oil to the water pump shaft [1] outer
surface.
Install the water pump s haft to the right crankcase
cover.
Install the plain washer [1] and impeller [2] to the water
pump shaft.
Hold the water pump shaft and tighten the water pump
impeller [1] to the specified torque.
Install the right crankcase cover (page 12-8).
Install a new O-ring [1] to the water pump cover [2].
Install the water pump cover.[1]
[2][1]
TORQUE: 10 N·m (1.0 kgf·m, 7...

9-12
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COOLING SYSTEM
Install and tighten the bolts [1], drain bolt [2] and a new
sealing washer [3] securely.
Fill the recommended coolant and bleed the air (page
9-5).
RADIATOR RESERVE TANK
REMOVAL/INSTALLATION
Remove the right fuel tank shroud (page 2-4).
Place an approved container  under the radiator reserve
tank [1].
Disconnect the overflow hose [2] and siphon hose [3]
from the reserve tank.
Remove the bolts [4] and radiator reserve tank
Installation is in the reverse order of...

9-13
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COOLING SYSTEM
WATER PIPE
REMOVAL/INSTALLATION
Drain the coolant (page 9-5).
Remove the bolts [1] and water pipe [2].
Remove the O-rings [1] from the water pipe [2].
Installation is in the reverse order of removal.
 • Replace the O-ring with new ones.
Fill the system with the recommended coolant (page 9-
5).[2]
[1]
[1]
[2] 

MEMO
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10-1
10
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10. CYLINDER HEAD/VALVES
SERVICE INFORMATION ···························10-2
TROUBLESHOOTING·································10-2
COMPONENT LOCATION ··························10-3
CYLINDER COMPRESSION ··················\
·····10-4CYLINDER HEAD COVER ························· 10-4
CAMSHAFT················································· 10-6
ROCKER ARM ·········································· 10-11
CYLINDER HEAD ····································· 10-13 

10-2
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CYLINDER HEAD/VALVES
CYLINDER HEAD/VALVESSERVICE INFORMATION
GENERAL
 • This section covers service of the cylinder head, valves, rocker arms and camshaft.
 • The camshaft and rocker arm service can be done with the engine installed in the frame. The cylinder head service requires engine removal.
 • Be careful not to damage the mating surfaces when removing  the cylinder head cover and cylinder head. Do not tap the cylinder
head cover and cylinder head too hard during removal.
 •...

10-3
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CYLINDER HEAD/VALVES
COMPONENT LOCATION
12 N·m (1.2 kgf·m, 9 lbf·ft)
45 N·m (4.6 kgf·m, 33 lbf·ft)
10 N·m (1.0 kgf·m, 7 lbf·ft)
4.2 N·m (0.4 kgf·m, 3.1 lbf·ft)