Honda WDP30X Owner's Manual page 13

Pump Clappet Valves
1. Disconnect the spark plug cap from the spark plug (page 3).
2. Turn the fuel valve lever to the OFF position (page 3).
3. Flush the pump chamber (page 12).
4. Lift the suction side of the pump and allow all the water to drain out
the discharge fitting.
5. Use a 19 mm wrench and remove the nuts and flat washers from
both the suction and discharge ports.
FLAT
WASHER (4)
NUT (4)
CLAPPET VALVE
(discharge side)
6. Remove both ports. The clappet valves are directional, so when
removing the valves, note the water flow direction.
7. Inspect the ports, case sealing surfaces, and clappets for damage.
If the clappets are worn, torn, or damaged, replace them. If the
case sealing surface is damaged and cannot be cleaned, an
optional wear plate and gasket is available from your Honda water
pump dealer (page 20).
8. Install the clappet valves over the studs. On the discharge side,
install the flat side of the valve facing the housing. On the suction
side, install the flat side of the valve facing the port.
DISCHARGE
PORT
CLAPPET VALVE
(flat side facing the
housing)
PORT
9. Install both ports, making sure all clappet valve tabs are
positioned correctly.
10. Apply several drops of Hondalock 2 or equivalent thread lock to
the stud threads. Hand tighten the nuts, then torque evenly.
TORQUE: 20 ft-lb (27 N•m)
11. After tightening the nuts, insert a screwdriver into each port and
12. Run the pump and check for leaks.
Pump Diaphragm Disassembly
1. Disconnect the spark plug cap from the spark plug (page 3).
2. Drain the fuel tank (page 16). Flush the pump chamber (page 12).
3. Remove the plastic connecting rod cover (page 12).
CLAPPET VALVE
(suction side)
4. Remove the 4 nuts, washers, bolts, and the upper pump assembly
12 x 50 mm
BOLT (4)
12 mm
WASHER (8)
SUCTION
PORT
CLAPPET VALVE
(flat side facing the 5. Use a 17 mm wrench and remove the bolt securing the
port)
CLAPPET
VALVE
TABS
10 x 20 mm
BOLT
10 mm LOCK WASHER
check clappet valve operation. Clappets should operate freely
and should seal when released. If a clappet does not operate
properly, reinstall the clappet and recheck.
Pull the starter grip to rotate the connecting rod to the down
position.
using a 19 mm wrench. Place the upper pump and engine
assembly to the side.
CRANK ARM
UPPER PUMP
ASSEMBLY
12 mm
NUT (4)
connecting rod to the crank arm. Wipe the rod surface clean and
use a felt tip marker to mark the outside of the connecting rod for
reassembly.
CONNECTING ROD
NYLON
WASHER
WASHER
DIAPHRAGM
ASSEMBLY
LOWER CASE
CRANK
ARM
13