Yanmar 1GM, Operation Manual

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1. Gap gauges
[3-4.1 Propeller, propeller shaft
1) Select a propeller which is suitable for the size and shape of the vessel, as well as for its
intended usage. An extremely small or large propeller will reduce the speed of the vessel and
overload the engine, which may lead
to engine break down. It is recommended that a
propeller be selected in consultation with a reputable dealer. However, the best way to make
sure the propeller fits the vessel is to conduct a test run after installation.
2) It is effective to use a proper flexible stern tube to reduce vibration.
[3-5.1 Cooling water supply device
1) The engine should be operated only after checking the cooling water piping is completed.
Important
If the Cooling water pump is operated without water, the rubber impeller
inside the pump will be broken.
2) Kingston cock installation. Install the canvas on the outside of the hull, and the
canvas or rubber packing on the inside of the hull; tighten the kingston cock. Installation
directions are given in the figure at the right. Install the kingston cock cover as shown.
3) Piping
For the cooling water pipe, use a rubber hose with an inside diameter of 13mm. Piping should
be kept as straight and short as possible. If the pipe is too long, it will be difficult to draw
water up.
4) Connect the rubber hoses to the kingston cock, cooling water pump inlet, and engine
cooling water outlet, and secure with hose clamps.