YANMAR Diesel Engine 1GM, 2GM, 3GMD, 3HM. Manual - part 3

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.

Piping Diagram

1. Inside Packing
2. Kingston cock cover
3. Outside Packing
4. Direction of vessel movement

5) Seawater strainer
The seawater pump will be damaged if foreign matter is allowed to get into it. Therefore,
attach a seawater strainer between the seawater pump inlet and the seawater cock when the
sea water cock is not already equipped with a strainer.

6) Exhaust pipe layout
Be sure to use the water-lock. Installation of piping should be done as shown in the following
diagram.

6-a)
In case the water outlet of the engine side (A) is above water line.

6-b)
In case the water outlet of the engine side (A) is below water line.

7) Air ventilation and Intake pipe
If the engine is operated at below normal output, incomplete combustion can occur as a result
of an overheated engine room. Therefore, the engine room should be adequately ventilated.

Important

During piping works be sure to cover the intake opening to prevent the entry
of foreign matter.

1. Seawater pump
2. Seawater strainer
3. Kingston cock

1. W.L.
2. Waterlock
3. Above seawater      
line

1. W.L.
2. Waterlock
3. Vacuum valve

I3-6.] Remote control

1) Control cable Use only the single lever remote control device with 1GM 2GM, 3GM and
3HM engines.

Note

The dual lever remote control device cannot be used.

Recommended
Cable

Control Cable

Cable Clamp

Connecting metal
fittings

Speed Control

Morse 33-C

Yanmar Standard

Yanmar Standard

Clutch Control

Morse 33-C

Yanmar Standard

Yanmar Standard

Engine Stop (option)

Yanmar made
Morse

2) Speed control

2-a) A spring is attached to the connector to absorb shock when operating the speed control
lever. Make the wiring so that the spring works when the throttle is "idling" as illustrated.

1. Spring
2. Speed Control Lever
3. Connector
4. Idle adjusting bolt