Specifications

46
4. MAINTENANCE AND INSPECTION
EN
1. When the diaphragm is damaged,
crankcase pressure control is affect-
ed. Excessive crankcase pressure will
cause leaks at seals and mating part
surfaces.
2. At lubricating oil replacement or lubri-
cating oil fill, do not fill above the stan-
dard upper limit. If the lubricating oil
quantity is above the upper limit, the
amount of crankcase oil mist may in-
crease resulting in oil hammer.
(6) Clean & Check the Water Passages
When it is used for a long time, clean-
ing of the cooling water passages
such as cooling water rubber hoses
and heat exchanger is periodically
necessary. Because dirt, scale, rust,
and so on collect in the cooling water
passages and the cooling perfor-
mance declines.
This maintenance requires special-
ized knowledge.Consult your Yanmar
dealer or distributor.
(7) Adjust the Propeller Shaft Align-
ment
The rubber tension of the flexible en-
gine mounts is lost after many hours'
use. This leads to a drop in vibration
absorption performance, and also
causes centering misalignment of the
propeller shaft.
This maintenance requires special-
ized knowledge and techniques
Consult your Yanmar dealer or distrib-
utor.
Note: Be sure to replace the Yanmar flexible
engine mounts every 1000 hours or 4 years,
whichever comes first.
(8) Retighten all Major Nuts and Bolts.
After long time usage, the major nuts
and bolts of the engine may loosen.
Retighten the major nuts and bolts by
the standard tightening torques. This
inspection requires specialized knowl-
edge and techniques. Consult your
Yanmar dealer or distributor.
(9) Check the Impeller of a Seawater
Pump
The impeller must be replaced with
new one periodically (every 1000 hrs
or 4 years whichever comes first).
(See 4.3.5(6) for the procedure.)
(10)Adjust the Tension of an Alternator
Driving Belt
Replace the alternator driving belt with
new one every 1000 hours or four
years, whichever comes first, even if
there is no crack or damage in the sur-
face.
(See 4.3.5(7) for the procedure.)
4.3.7 Annually
(1) Replace Fresh Water Coolant
Cooling performance drops when
cooling water is contaminated with
rust and scale.
Breather system component
A Diaphragm cover E Rocker arm cover
B Spring F Breather baffle
C Center plate G Baffle plate
D Diaphragm H Intake manifold
E
F
G
H
A
B
C
D
NOTICE