Yanmar 6LYA-STP Mode D'emploi page 47

1) Cracks and loss of impeller ; flaws or excessive wear of impeller tips and side faces.
(Note) The impeller must be replaced periodically (every 2000 hours).
2) Damage to wear plate
④If there is no problem with the inner parts, fit the O-ring to the groove of the joint face and
re-install the side cover.
If water leaks continuously from the water drain pipe beneath the seawater pump during
operation, disassembly and maintenance (replacement of the oil seal) is necessary.
[NOTICE]
The seawater pump revolves clockwise, but the impeller
blades must be reinstalled in the counterclockwise direc-
tion. During reassembly, be sure to install the impeller
blades correctly as shown in the illustration at right.
When turning the engine manually, never turn it in the
reverse direction.
The impeller will be twisted and damaged.
(2) Inspection and Adjustment of Intake/Exhaust Valve Clearance
Inspection and adjustment must be made to correct the opening/closing timing lags of the
intake/exhaust valves. This inspection requires specialized knowledge and techniques. Consult
your Yanmar dealer or distributor
(3) Inspecting and Adjusting the Fuel Injection Valve
Adjustment is necessary to obtain the optimal fuel injection to ensure the good engine
performance. This inspection requires specialized knowledge and techniques.
Consult your Yanmar dealer or distributor.
(4) Replace the marine gesr oil and clean filter.
4.3.7 Inspection Every 2000 Hrs.
(1) Cleaning the Cooling Water System and Inspecting & Adjusting Parts
Rust and scale are deposited inside the seawater and fresh water cooling systems during long
use.
This lowers cooling performance, so it is necessary to clean and maintain the following parts in
addition to replacing the cooling water.
The internal contamination of the engine lube oil coolers reduces cooling efficiency and
accelerates lube oil coolers degeneration.
Servicing jobs above require specialized knowledge.
Consult your Yanmar dealer or distributor.
Relevant Cooling Water System Parts:
Seawater pump, engine lube oil cooler,
intercooler, fresh water pump, fresh water cooler, thermostat, etc.
_ _
44
Direction of rotation
Impeller