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Yanmar Engine Identification Help
Use this page to help identify your engine model based on year, horsepower and other data. If you do not find your engine listed here you may contact us at: customerservice@torresenonline.com. We will be adding more information to this page often. Let us know what engine you have and we will make it a priority to get your engine listed. Understanding YANMAR engine model codes Most engine model designations are on an engine data plate, on the front or the top of the engine. Some older engines have the data plate on the adapter plate between the engine and the gearbox . Here are some examples of engine model codes and their meanings: YSE8 Y= horizontal cylinder, lying down.
SE = engine model type or block type.
8=8 horsepower
If an engine model does not have the Y in the beginning, the engine has a vertical cylinder or cylinders. The numbers 1, 3, 4, and 6 indicate the number of cylinders. For example, 3GM is a 3 cylinder engine with a GM type block. A 2GM is a 2 cylinder engine with a GM type block, and so on.
A 3GM30 is a 3GM that has a larger bore and therefore develops more horsepower than its predecessor. The 1GM, 2GM and 3HM were also uprated to 1GM10, 2GM20 and 3HM35 respectively, note, the suffix numbers are not the horsepower of the engine.
All of the above engines are either 'raw water' cooled or 'fresh water' cooled. An engine with an enclosed cooling system containing fresh water and coolant, in turn cooled by raw water going through a heat exchanger, is a fresh water cooled engine. On engines that are either 'raw' or 'fresh', below 34hp, the fresh water cooled engine has the letter F in the model designation, i.e. a 3HM35F is a freshwater cooled engine. If the F is absent, it is a 'raw' water cooled engine. The JH, LH, LP, LY, CX and KY family of engines are all freshwater cooled. The letter C indicates the engine has a saildrive attached. A 3GM30FC is a 3 cylinder, freshwater cooled engine from the GM family, with a saildrive attached. A 4JH2-BE model is fitted with a down angle gearbox. An M means the engine was shipped from the factory without a gearbox e.g. 6CXM-ETE The 4JH series was uprated to 4JH2 series, then 4JH, series, each series increasing in bore size and horsepower while reducing emission levels to comply with the Bodenzee Regulations in Europe and the EPA / CARB regulations in the USA. 3JH, and 3JH3 versions are also of this family.
The 4LH and 4LHA series are both 4 cylinder engines with the same long block assembled in Japan, but the 4LHA is finally assembled in the USA with US sourced components, the same also applies to the 6LY and 6LYA engines. The models 3JH and over have a suffix in the model code: -E is a normally aspirated export engine
-TE, is a turbocharged, export model engine, -ETE is extra turbocharged -HTE is highly turbocharged, -DTE is deluxe turbocharged
-UTE is ultra turbocharged, -STE is super turbocharged, etc.
When the code has a Z, e.g., 4LHA-STZE, the engine is an inboard outboard model with a Mercruiser sterndrive or 'Z' drive.
Y Series S Series QM Series GM/HM Series GM/HM Bored Up Series YM Series JH Series JH2 Series JH3 Series JH4 Series LH Series LY Series
Race-proven performance with startling power-to-weight capability and low-slung configuration. Extremely popular for repowering petrol-driven engines because of the flat-top, narrow profile of these diesels. The engines benefit further from outstanding fuel economy. This series includes the following engines: LP Series CX Series
These horizontal models lay down in a low profile. The series was updated three times with the YSE being the earliest model, followed by the YSB and then the YSM. Either a 2:1 or 3:1 transmission. The models were sea-water cooled, singe cylinder, heavy duty. This series includes the following engines:Engine HP Years In Production Comments YSB12 12 1976 - 1977 B=Between YSB8 8 1976 - 1977 B=Between YSE12 12 1974 - 1976 E=Early YSE8 8 1974 - 1976 E=Early YSM12 12 1977 - 1980 M=Modern YSM8 8 1977 - 1980 M=Modern
Vertical models, updated two times with the SVE engines followed by the SB. Single cylinder, 2:1 or 3:1 transmissions, sea water cooled, heavy duty. This series includes the following engines:Engine HP Years In Production Comments SB12 12 1976 - 1980 B=Between SB8 8 1976 - 1980 B=Between SVE12 12 1974 - 1976 E=Early SVE8 8 1974 - 1976 E=Early
The QM series was available either sea-water or fresh-water cooled. 2:1 or 3:1 transmissions. A designation of F near the end of the model means it is fresh-water cooled. F=Factory Fresh Water This series includes the following engines:Engine HP Years In Production Comments 2QM - originally only distributed in Japan 2QM15 15 1977 - 1980 2 Cylinder 2QM20 22 1975 - 1980 Engines with serial numbers 0001 - 0030 were prototypes and may require different parts. Engines with serial numbers 80001 - 80930 and 81131 - 81180 were also different from the primary production models and may require different parts. Engines with serial numbers 80931 - 81130 and any serial number higher than 81181 will use standard 2QM20 parts. 2QM20(F) 22 1975 - 1980 2 Cylinder 2QM20(H) 22 1975 - 1980 2 Cylinder 3QM - originally only distributed in Japan 3QM30 33 1976 - 1980 3 Cylinder 3QM30(F) 33 1976 - 1980 3 Cylinder 3QM30(H) 33 1976 - 1980 3 Cylinder
Introduced in 1980 and 1981 this series was a completely new generation of engines. Lighter, smaller, smoother and quieter than previous engines. An F designation on the model number indicates factory fresh-water cooling. 35 AMP alternators. This series includes the following engines:Engine HP Years In Production Comments 1GM 7.5 1980 - 1983 Raw 2GM 15 1980 - 1983 Raw 2GMF 15 1980 - 1983 Fresh 3GM 22.5 1980 - 1983 Raw 3GMD 22.5 1980 - 1983 . 3GMF 22.5 1980 - 1983 Fresh 3HM 30 1980 - 1983 Raw 3HMF 30 1980 - 1983 Fresh
Similar to the earlier standard GM/HM series, these engines provide upgraded horsepower and a 55 AMP alternator (1GM10 35 AMP). Special Note: If your engine serial number starts with an "E" you must make sure that you use parts for the YEU engines. For example, if you have a 2GM20 with a serial number starting with E you actually have a 2GM20YEU. The (YEU) engines are European manufactured and now more common in the United States than the Japan built models. This series includes the following engines:Engine HP Years In Production Comments 1GM10 9 1983 - 2009 Raw Water 2GM20 18 1983 - December 2005 Raw 2GM20-YEU 18 1997 - Present 2GM20F 18 1983 - December 2005 Fresh 2GM20FYEU 18 - . 3GM30 27 1983 - December 2005 Raw 3GM30-YEU 27 1997 - Present 3GM30F 27 1983 - December 2005 Fresh 3GM30F YEU 27 - 3HM35 34 1983 - 1992 Replaced with 3JH2 3HM35F 34 1983 - 1992 Replaced with 3JH2
Completely redesigned cylinder block and new combustion system. Indirect injection, fresh water cooled with heat exchanger, this new engine line complies with ETA Tier 2 and BSO Tier 2. Electric stop solenoid is standard. This series includes the following engines:Engine HP Years In Production Comments 2YM15 14 Fall 2004 - Present US Built 3YM20 22 Summer 2004 - Present US Built 3YM30 30 Summer 2004 - Present US Built
Extremely smooth running. Two transmission possibilities were available – either a Hurth or 7 degree down angle B type. 80% of the parts for this series of engine are inter-changable since all four engines in the series used the same block. This series includes the following engines:Engine HP Years In Production Comments 4JH-DTE 77 1985 - 1989 Turbo Charged 4JH-E 44 1983 - 1989 4JH-TE 55 1983 - 1989 Turbo Charged 4JH-THE 66 1985 - 1989 Turbo Charged
Extremely smooth running. Horsepower upgrade over the previous JH series. Quiter and cleaner exhaust. A B designation on these engines indicate a down angle transmission. This series includes the following engines:Engine HP Years In Production Comments 3JH(B)E 38 1992 - 1999 3JH2-T(B)E 47 1991 - 1999 Turbo 4JH2-(B)E 51 1989 - 1999 4JH2-DT(B)E 88 1989 - 1999 Turbo-Intercooled 4JH2-HT(B)E 76 1989 - 1999 Turbo-Intercooled 4JH2-T(B)E 63 1989 - 1999 Turbo-Intercooled 4JH2-UT(B)E 100 1991 - 1999 Turbo-Intercooled
Upgraded blocks, smaller overall size, smoother and quieter. Meets all new EPA requirements. This series is a replacement of the JH2 series. This series includes the following engines:Engine HP Years In Production Comments 3JH3 40 May 1999 - 2004 4JH3-DTBE 125 Summer 1999 - December 2006 Turbo-Intercooled 4JH3-HTBE 100 Summer 1999 - December 2006 Turbo-Intercooled 4JH3-T(B)E 75 Summer 1999 - December 2006 Turbo 4JH3E 56 May 1999 - 2004
Redesigned cylinder block and new combustion system. Produces 25% more torque with only a 10% increase in displacement. Lower running speed and less vibration reduce noise by five decibels. Complies with EPA Tier 2 emmissions. This series includes the following engines:Engine HP Years In Production Comments 3JH4E 39 Summer 2004 - Present 3JH4E 40 Summer 2004 - Present 4JH4E 55 Summer 2004 - December 2006
Extremely compact and lightweight. Very powerful. Transmission is a 7 degree down angle (bi-rotational). Also designed to cleanly replace gas V-8 engines. Larger Hp models. A=Built in USA. Available as both inboard and Mercruiser Stern Drive packages. This series includes the following engines:Engine HP Years In Production Comments 4LH-DTE 170 1990 - 2000 Replaces 350 GM 4LH-HTE 140 1988 - 2000 Turbo-Intercooled 4LH-STE 230 September 1995 - August 1998 Replaces 454 GM 4LH-TE 110 1988 - 2000 Turbo 4LHA-DTE 190 June 2000 - August 2001 Upgrade from 170 4LHA-DTZE 190 Spring 2000 - August 2001 Merc I/O Package 4LHA-HTE 150 Spring 2000 - August 2001 Turbo-Intercooled 4LHA-HTZE 150 Spring 2000 - August 2001 Merc I/O Bravo 4LHA-STE 230 September 1998 - August 2001 Waste gated and US built 4LHA-STZE 230 August 1999 - August 2001 Merc I/O Bravo
Introduced in 1992, this is the six cylinder version of the 4LH series. Lightweight, compact with excellent horsepower to weight ration. All models are the same size and weight. Smallest HP in its class.
Engine HP Years In Production Comments 6LY-STE 350(70) 1994 - 1996 Turbo-Intercooled 6LY-UTE 315 1992 - 1996 Turbo-Intercooled 6LY2-STE 420 1998 - Present 6LY2A-STE 420 March 2001 - September 2001 US built 6LYA-STE 350 January 1997 - May 2001 US built 6LYA-STP - 6LYA-UTE 315 January 1997 - December 2001 US built
New mini-6 cylinder, super quiet, lightweight, designed for inboard and Merc sterndrive packages. Higher speed (3800 RPM). Many changes from Yanmar's traditional marine models. This series includes the following engines:Engine HP Years In Production Comments 6LP 250-300 1997 - present 6LP-DTZE 250 January 1998 - September 2001 Merc I/O Package 6LP-STE 300 June 1997 - July 2001 Inboard 6LP-STZE 300 January 1998 - October 2001 Merc I/O Bravo 6LPA-DTE 250 March 2001 - July 2001 US built 6LPA-DTP 260 August 2001 - December 2006 Higher Hp 6LPA-DTZE 250 March 2001 - July 2001 US built 6LPA-STE 300 March 2001 - June 2001 US built 6LPA-STZE 300 March 2001 - June 2001 US built 6LPDTE 250 June 1997 - September 2001 Super Quiet/Inboard
Heavy duty, super smooth and quietest in this HP class. Commercial model with 4 valves per cylinder. Premium quality. This series includes the following engines:Engine HP Years In Production Comments 6CX(M)-ETE 420 1992 - December 2001 Turbo-Intercooled 6CX-GTE 465 Fall 1999 - December 2005 Turbo-Intercooled 6CXM-GTE2 500 July 2001 - Present Turbo-Intercooled