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GM-YM Series (Shaftdrive)
 
Introduction
GM/YM Series - Shaftdrive (9.1 - 29mhp)

As used on our Couta Boats (Yanmar 3YM20 or 2YM15)

Yanmar GM Series Marine Diesel Engine (9.1mhp)
Yanmar New Generation YM Series 3 Model (14 - 29mhp)

1GM - More power, same size

Yachtsmen looking for extra power without extra size and weight can find it in Yanmar's new 1GM10 diesel engine. Yanmar have up-powered their popular 1GM model by 20% to re-create its trusty performance at a higher 6.7kW, with negligible change in size, weight and shape. Its only gain is a heftier flywheel to maintain smooth running and easy starting.

YM Series

The naturally aspirated new generation YM series continues the Yanmar tradition of providing boaters with superior technology - quiet, compact power to be relied upon. The latest lightweight propulsion developments from the diesel leader Yanmar are the all new 2YM15, 3YM20 and 3YM30 models. The 3YM20 and 3YM30 were designed as a direct upgrade for the legendary 2GM20 and 3GM30 models they replace. The new 2YM15 is an additional model to what is recognized already as the most complete line up of marine engines in the business. With the added benefit of simplified maintenance due to the new location of the sea-water pump and all other service points being together near the engine front these units no doubt are already on track to be recognized as the best-in-class auxiliary power for sailboats and tough, reliable primary power for small motor craft.

Best-in-class diesel power
More and less

With more displacement, more torque, more amps, yet even quieter, with less smoke than ever, EPA Tier 2 emission regulations and BSO/SAV stage 2 compliant. The flat power curve allows you to choose the propeller size to best match your application.

The same

For ease of installation and for repowering, these latest 3 cylinder models are the same size as their predecessors, with similar footprints.

All new

Completely re-designed cylinder block and indirect combustion system for optimised performance and maximum economy. New compact control panel, new injection pump, and new electric stop solenoid.
Specifications
 1GM102YM153YM203YM30
Cylinders1233
Maximum Output9.1mhp @ 3600rpm14mhp @ 3200-3600rpm21mhp @ 3200-3600rpm29mhp @ 3200-3600rpm
Cooling SystemDirect sea water coolingFreshwater H/EFreshwater H/EFreshwater H/E
Bore x Stroke75 x 72 mm70 x 74 mm70 x 74 mm76 x 82 mm
Displacement0.318 litres0.549 litres0.854 litres1.116 litres
Reduction (Fwd) & ModelGear2.21/2.62/3.22:1
KM2P-1		2.21/2.62/3.22:1
KM2P1		2.21/2.62/3.22:1
KM2P1		2.21/2.62/3.22:1
KM2P1
Dry Weight (Engine & transmission)76 kg113 kg130 kg133 kg
Direction of rotationCrankshaftCounter-clockwise viewed from stern
Propeller shaftClockwise viewed from stern
Start MethodHand ElectricElectric
Accessories
 ComponentGM SeriesYM SeriesRemarks
InstallationFlexible Engine Mounts x 4STDSTDØ 4
Propeller shaft half coupling (slit type)OptionalOptionalØ 20
Propeller shaft half coupling (taper type)OptionalOptionalØ 28 or 30
Propeller shaft half coupling (straight rough bore)STDSTDØ 16
CoolingExhaust water mixing elbow, L-typeSTDSTD 
Kingston cock/sea water filterOptionalOptionalOptional
LubricationLube oil evacuation pumpSTDSTDSTD
Starting & stoppingEngine stop cable (manual)STDN/A3m
Engine stop solenoidN/ASTD 
Electrical and InstrumentationAlternator, 12V
GM - 35A
2YM - 60A
3YM - 80A		STDSTD 
Electric type bilge pump, 12VOptionalOptional 
New B-type instrument panel (VDO type)STDSTD 
Extension wire harnessSTD 3 mtSTD 6 mt 
Battery switchOptionalOptional 
ControlPush-pull type remote control cable
2 pcs/unit (MORSE:33C)		OptionalOptional 
Side-mount type single control head
(MORSE:MV)		OptionalOptional 
Top-mount type single control head
(MORSE:MT3)		OptionalOptional 
OthersSpare parts kitOptionalOptional 
Special overhauling tools (for engine)OptionalOptional 
Special overhauling tools (for marine gear)OptionalOptional 
Front belt cover (guard) N/ASTD 
Drawings AutoCAD Drawings are in Drawing Interchange Format (DFX)
Download free DFX viewer here [6.7MB]