70 Servicing Your Honda
Coolant
1. Check the cooling system for leaks (see an
official Honda Shop Manual for
troubleshooting of leaks).
2. Check the radiator hoses (1) for cracks,
deterioration, and radiator hose clamps for
looseness.
3. Check the radiator mount for looseness.
4. Make sure the overflow hose (2) is connected
and not clogged.
5. Check the radiator fins (3) for clogging.
6. Check the bleed hole (4) below the water pump
cover (5) for leakage. Clean away any clogged
dirt or sand, if necessary. Check the bleed hole
of the water pump for signs of seal leakage. If
water leaks through the bleed hole, replace the
mechanical seal. If oil leaks through the bleed
hole, replace the oil seal. Make sure that there
is no continuous coolant leakage from the
bleed hole while operating the engine.
A small amount of coolant weeping from the
bleed hole is normal. See an official Honda
Shop Manual or consult your dealer for
replacing the mechanical seal or oil seal.
Both seals should be replaced at the same time.
7. Check the radiator air passages for clogging or
damage.
Straighten bent fins (6), and remove insects,
mud or other obstructions with compressed air
or low water pressure.
Replace the radiator if the air flow is restricted
over more than 20% of the radiating surface.
Radiator should be replaced by your dealer, unless
you have the proper tools and service data and are
mechanically qualified. Refer to an official Honda
Shop Manual.
Refer to Important Safety Precautions on page 27.
Coolant should be replaced by your dealer, unless
you have the proper tools and service data and are
mechanically qualified.
Refer to an official Honda Shop Manual.
To properly dispose of drained coolant, refer to
You & the Environment on page 168.
Improper disposal of drained fluids is harmful to
the environment.
Cooling System Inspection
(1) radiator hoses (3) radiator fins
(2) overflow hose
(4) bleed hole
(5) water pump cover
(6) fins
Coolant Replacement
Removing the radiator cap while the
engine is hot can cause the coolant to
spray out, seriously scalding you.
Always let the engine and radiator cool
down before removing the radiator cap.
3RMKE630_CRF450RX-L.book Page 70 Friday, April 5, 2019 5:55 PM
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