70
S08
MAINTENANCE
EXTRACT THE RAW WATER PUMP IMPELLER
CAUTION !
If the engine has been run without supply of raw water,
check the raw water pump impeller. Change it if needed.
NOTE !
The service life of the raw water pump impeller vary
depending the operating conditions.
The raw water pump impeller is an essential component
of the engine. It should be changed regularly along with
the seal. A worn impeller could crack and damage the
cooling system. Always have a spare raw water pump
impeller on board.
TO EXTRACT THE IMPELLER:
1. Stop the engine, remove the key from the panel and
close the sea cock.
2. Remove the top cover flange of the raw water pump
(6 screws).
3. Remove the gasket (
A
).
4. With a permanent pen, mark the position of the
neoprene impeller (
B
) inside the pump in order to
install it in the correct position in case of reinstallation.
5. Gently pull off the impeller in using an extractor.
6. Closely inspect the impeller. Check for damaged,
cracked, broken missing or flattened vanes. Change
the impeller if it is damaged. Toroughly clean and
drain the raw water system if parts of the impeller
are missing.
7. Inspect the cover and the gasket for corrosion or
damage. Change it if they are damaged.
8. Lubricate the inside of the pump and the cover with
waterproof grease for rubber.
9. Install the impeller. If reinstalling the old one,
place it at the same location using the mark done
previously. Rotate the impeller in the same direction
as the engine rotation. Lubricate the impeller with
waterproof grease for rubber.
10. Install the gasket and the cover on the pump housing.
11. Open the sea cock, check for leaks. Prime the raw
water system by adding water through the raw water
filter if necessary.
12. Start the engine and check for leaks.
Summary of Contents for T6.280
Page 1: ...NANNI MARINE ENGINE OPERATOR MANUAL DGBXXT09010 ENGINE 6 420TDI T6 280 T6 300 Z6 300...
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Page 39: ...39 S06 COMPONENTS ENGINES VIEWS 6 420TDI T6 280 T6 300...
Page 40: ...40 S06 COMPONENTS ENGINE VIEW Z6 300 1...
Page 77: ...77 NOTES...
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