4-12
Replacing Raw Water Pump Impeller
See Table 4-1 for scheduled replacement. Replace
the impeller as follows:
1. Close the sea valve.
2. Disconnect the negative (−) cable at the battery
to prevent the engine from starting.
WARNING
Accidental or remote starting
can cause severe personal injury or death.
Disconnect the negative (−) cable at the bat-
tery to prevent the engine from starting.
3. Loosen the three screws on the end of the
pump body to remove the pump body or impel-
ler cover, depending on construction (Fig-
ure 4-7).
4. Remove the impeller. An impeller removal tool
may be necessary to pull the impeller off the
shaft. Note: If vanes have broken off the impel-
ler, check for and cleanout pieces that may
have lodged in the heat exchanger.
5. Install the new impeller. To ease installation and
provide initial lubrication and better pump suc-
tion before water reaches the pump, wet the in-
side of the pump and impeller with water, soap
solution or a silicone lubricant. It also helps to
twist the impeller while squeezing it into the
housing.
CAUTION
Do not lubricate the impeller
with grease or oil or other petroleum prod-
ucts because they are known to chemically
attack impeller materials.
6. Secure the cover or pump body and O-ring.
7. Fill the sea water strainer for faster priming at
startup if it is above the water line.
8. Open the sea valve, reconnect the battery
cables (negative [−] last) and start the genset.
The genset will shut down within a few seconds
if there is no raw water flow and Fault Code
No. 7 (p. 9-5) will be declared. If it shuts down,
find out why, remove any blockage and restart
the genset.
MDKBP, MDKBR, MDKBS
MDKBK, MDKBL, MDKBM, MDKBN
MDKBT, MDKBU
FIGURE 4-7. TYPICAL RAW WATER PUMPS
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