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

I. Name of parts

1 Reduction and reversing gear
2 Output shaft coupling
3 Clutch control lever
4 Installation foot
5 Engine tube oil dipstick
6 Clutch tube oil dipstick/Supply port
7 Cooling water pump
8 Fuel feed pump
9 Exhaust manifold
10 Mixing elbow
11 Air intake silencer
12 Alternator
13 Lube oil filter
14 Starter motor
15 Decompression lever
16 Anticorrosion zinc
17 Fuel injection pump
18 Fuel injection valve
19 Crankshaft V-pulley
20 Speed control lever
21 Cooling water drain cock (Cylinder block/Exhaust manifold)
22 Fuel filter
23 Breather pipe
24 Fuel injection limiter
25 Engine lift plate
26 Lube oil supply port
27 Oil pressure sender
28 Engine stop device

III. Engine installation

[3-1.1 Inspection after unpacking

During unpacking be careful not to break the engine base. Check the following points:

1) Have any nuts or bolts become loose or fallen off?
2) Have any parts become rusty?
3) Is there any water inside the engine?
4) Has any part of the engine been broken, chipped, or crushed?
5) Are any of the accessory parts/ items broken or defective?

[3-2.1 Preparation of the engine foundation plate

The installation angle will differ with the vessel configuration and installation location of the
engine. The most suitable installation angle is 8 degrees and the maximum installation angle is
15 degrees. If it is greater than this, horsepower loss will increase and vessel speed will drop. In
addition, abnormal wear of parts will occur and engine performance will be adversely affected.

[3-3.1 Engine installation

1) For the engine installation, be sure to use the flexible rubber mount.
Yanmar prepared the flexible mounts which match the respective engine characteristics as a
standard accessory.

1. Lock Nut

2. Jack Nut
3. Rubber Mount
4. Indication No. (50, 70, 75, 100)

Note

Avoid splashing the flexible mount with water, oil etc.

Indication #

Installation distance (unit: mm)

Engine model

Front Rear

A

B

1GM

70

50

209

370

2GM

100

75

275

370

3GMD

100

75

355

370

3HM

100 

100

432

400

It is convenient for installation to make the GUIDE PLATE as illustrated.

2) Be sure the propeller shaft lines up with and matches both shaft joints. If necessary adjust the
height of the engine with a jack nut to line up the propeller shaft and the engine. Fit the propeller
shaft and the intermediate shaft if there is one-to the engine.
With a gap gauge, measure the gap of the connection at the top, bottom, right, and left. The
maximum tolerance should be less than 0.2mm. Lock nut should be as low as possible.

3) Tighten the installation bolts firmly and evenly. Do not force the bolts in if the propeller shaft
does not line up.

     Important

After 50 hours operation, check that the propeller shaft lines up again, and re-
adjust if necessary.

View From Top

1 - Rear

2 - Front