4. MAINTENANCE AND INSPECTION Breather system component A B C D
E
F G A B C D
Diaphragm cover Spring Center plate Diaphragm
H E F G H
Rocker arm cover Breather baffle Baffle plate Intake manifold
NOTICE
EN
1. When the diaphragm is damaged, crankcase pressure control is affected. Excessive crankcase pressure will cause leaks at seals and mating part surfaces. 2. At lubricating oil replacement or lubricating oil fill, do not fill above the standard upper limit. If the lubricating oil quantity is above the upper limit, the amount of crankcase oil mist may increase resulting in oil hammer. (6) Clean & Check the Water Passages When it is used for a long time, cleaning 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 performance declines. This maintenance requires specialized knowledge.Consult your Yanmar dealer or distributor.
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(7) Adjust the Propeller Shaft Alignment The rubber tension of the flexible engine 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 specialized knowledge and techniques Consult your Yanmar dealer or distributor. 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 knowledge 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 surface. (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.
