Yanmar Engines Identification

Marine Engines

If you engine model starts with a “Y”, you have a horizontal cylinders engine. For example the YSB12 engine model means:

·         Y= Horizontal cylinder

·         SB= Engine or block model type

·         12 = HorsePower

 

If your engine model does not have the “Y” in the beginning that means the engine is a vertical cylinder(s). The numbers 1,2, 3 and so on, indicate the number of cylinders. For example, 1GM is a 1 cylinder engine with a GM type block. A 2GM is a 2 cylinder engine with a GM type block, and so on.

The numbers next to the cylinder number and engine model indicate a larger diameter than the STD bore. The 2GM20 is a 2GM that has a larger bore and therefore develops more horsepower than its “base” version. The 1GM, 3GM and 3HM were also upgraded to 1GM10, 3GM30 and 3HM35 respectively, please note that the suffix numbers (2GM20, 3GM30…) are not the horsepower or the cylinder bore diameter are just a number indicating that “base” model was upgraded.

Fresh water cooled and raw water cooled

All Yanmar engines can either be raw water cooled or fresh water cooled (closed system). A fresh water cooled engine haves an enclosed cooling system containing fresh water (or coolant), in turn cooled by raw water through a heat exchanger. This system is similar to a car engine where the antifreeze in the radiator circulates through the engine.

In a raw water cooling system, the sea water circulates through the engine instead of the fresh water or antifreeze. The sea water then cools the engine directly. The disadvantage of this system is that when the salted water circles inside the engine, corrosion and rust are built inside the engine, causing the engine failure by corroding the internal cooling system.

The fresh water cooled engines bellow 35 HorsePower have the letter “F” in the model designation, for example, a 2GM20F is a freshwater cooled engine. If the F is missing, you have a raw water cooled engine. The family engine models CX, JH, KL, LH, LP and LY are all freshwater cooled, however being above the 35HP they don’t have the letter “F” indicating the freshwater cooled system.

Attachments

 The letter “C” indicates that the engine has a sail-drive attached. A 2GM20FC for example is a 2 cylinders, freshwater cooled engine of the GM family engines, with a saildrive attached. The letter “M” means the engine was shipped from the factory without a gearbox. Letter “Z” indicates the engine is equipped with a “Z”' drive.

Turbo options

Yanmar Turbocharged models can fit different versions of turbos. Designations codes can be:

·         TE – Turbocharged (the “E” stands for export model)

·         ETE – Extra Turbocharged (the “E” stands for export model)

·         HTE – Highly Turbocharged (the “E” stands for export model)

·         DTE – Deluxe Turbocharged (the “E” stands for export model)

·         UTE – Ultra turbocharged (the “E” stands for export model)

·         STE – Super Turbocharged

One last note regarding European models bellow 35HP. If the serial number of your engine starts with an “E”, then you must identify and order parts for the YEU (Yanmar Europe) manufactured engines. For example, if you have a 3GM30 and you serial number starts with an “E”, then your correct engine model is 3GM30-YEU. Even though most of the parts are common for both versions (3GM30 and 3GM30-YEU both use the same engine cylinder block) some specific parts are very different, particularly the sea water pumps. Although it’s very unusual to see imported Japanese or American manufactured models in Europe you are advised.

Marine Engines Models Table

 

Model

HP

from

to

SVE

8 & 12

1974

1976

SB

8 & 12

1976

1980

YSE

8 & 12

1974

1976

YSB

8 & 12

1976

1977

YSM

8 & 12

1977

1980

 

Model

HP

from

to

2QM20

22

1975

1980

2QM15

15

1977

1980

2GM, 2GMF

15

1980

1983

2GM20, 2GM20F

18

1983

2004

1GM

7,5

1980

1983

 

Model

HP

from

to

3GMD, 3GMF

22,5

1980

1983

3HMD, 3HMF

30

1980

1983

3JH2E

38

1992

1999

3QM30

33

1976

1980

3GM30, 3GM30F

27

1983

2003

3HM35, 3HM35F

35

1983

1992

3JH2-TE

47

1991

1999

3JH3E

40

1999

2004

 

Model

HP

from

to

4JH-E

44

1983

1989

4JH-HTE

66

1985

1989

4JH2E

50

1989

1999

4JH2-HTE

76

1989

1999

4JH2-UTE

100

1991

1999

4JH3E

56

1999

2004

4LH-TE

110

1988

2001

4LH-HTE

140

1988

2001

4LH-DTE

170

1990

2001

4JH-TE

55

1985

1989

4JH-DTE

77

1985

1989

4JH2-TE

62

1989

1999

4JH2-DTE

88

1989

1999

4LH-STE

230

1995

2001

4LHA-STE/STZE

230

1999

2001

 

Model

HP

from

to

6LP-DTE

250

1997

2001

6LP-STE

300

1997

2001

6LY-UTE

315

1992

2001

6LYA-STE

350

1997

2001

6LP-DTZE

250

1998

2001

6LP-STZE

300

1998

2001

6LYA-UTE

315

1997

2001

6LY2-STE

420

1998

2001