Specifications

4. MAINTENANCE AND INSPECTION
45
EN
careful to turn it in the correct direc-
tion. Incorrect turning will twist the
impeller and damage it
(7) Clean the Exhaust/Water Mixing El-
bow.
There are two types of mixing elbows,
the L-type and the U-type. The mixing
elbow is attached to the exhaust man-
ifold. The exhaust gas is mixed with
seawater in the mixing elbow.
1. Clean dirt and scale out of the air pass
and seawater pass of the mixing el-
bow.
2. Repair the crack or damage of the
mixing elbow by welding, or replace if
necessary.
3. Inspect the gasket and replace if nec-
essary.
(8) Check the Wiring Connectors
Check that each electric connection
part has not become loose.
4.3.6 Inspection Every 1000 Hrs (or
4 years).
(1) Inspection and Adjustment of In-
take/ Exhaust Valve Clearance.
When operating for long periods of
time, the clearance between the in-
take/exhaust valve and the rocker arm
will change and affect engine perfor-
mance.
Adjustment of the valve clearance is
necessary and the adjustment re-
quires specialized knowledge and
techniques. Consult your Yanmar
dealer or distributor.
(2) Inspect and Adjust the Fuel Injec-
tion Spray Condition.
Adjustment is necessary to obtain the
optimal fuel injection to ensure the
best possible engine performance.
This inspection requires specialized
knowledge and techniques.
Consult your Yanmar dealer or distrib-
utor.
(3) Adjusting the Remote Control Ca-
bles (See 4. 3. 1(6))
(4) Inspect and Adjust the Fuel Injec-
tion Timing
Fuel injection timing must be adjusted
to ensure optimal engine perfor-
mance.
Consult your Yanmar dealer or distrib-
utor.
(5) Diaphragm assembly inspection
Inspect the diaphragm assembly on
the rocker arm cover.
1. Loosen screws, remove the dia-
phragm assembly, and check for oil
and contaminants between the dia-
phragm and the cover. If oil and con-
taminants enter into the diaphragm
assembly, the diaphragm will not op-
erate as designed.
2. Inspect the diaphragm rubber and
spring for damage. If necessary, re-
place with new ones.
A Direction of Impeller B Impeller rotating direction
C Impeller D Seawater pump
D
C
A
B