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

Yanmar Saildrive Series Marine Diesel Engines
GM Series 9.1mhp | YM Series 14mhp = 29mhp

Smart escape from conventional drive problems

More and more boat owners are turning to Saildrive power as the smart way to best the problems of conventional stern tube shaft drives. The beautiful simplicity of this compact drive systems makes it the sensible choice for numerous types of boats. Not only is reliability a big element in these designs but also is stability, as they eliminate shaft vibrations, noise, alignment and stuffing box problems.

The logical power-to-prop direct drive combines all the advantages of the outdrive-inboard systems and has now been well accepted in boating circles.

The Saildrive has been found to improve boat balance, give more maneuvrability and better thrust. Drive by the famous Yanmar diesels, these Saildrives put a lot of dependable power in the right place in a boat.
Specifications
GM/YM Series1GM10C2YM15C3YM20C3YM30C
Cylinders1233
Maximum Output9.1mhp @ 3600rpm14mhp @ 3200-3600rpm21mhp @ 3200-3600rpm29mhp @ 3200-3600rpm
Cooling SystemRaw WaterFreshwaterFreshwaterFreshwater
Bore x Stroke75 x 72 mm70 x 74 mm70 x 74 mm76 x 82 mm
Displacement0.318 litres0.549 litres0.854 litres1.115 litres
Saildrive ModelSD20SD20SD20SD20
Dry Weight104 kg134 kg151 kg157 kg

Saildrive ModelSD20
Reduction gear systemConstant mesh gear
with dog clutch
Reduction Ration
(Ahead/Astern)		2.64/2.64
Direction of rotationInput shaftCounterclockwise viewed from stern
Prop shaftCounterclockwise viewed
from stern
Lubrication SystemOil Bath
Dry weight - kg
(Saildrive only)		30 kg
Lubrication oil for saildrive1GM10C = SAE20/30
2YM15C - 3YM30C = SAE80W90 or 90
Drawings AutoCAD Drawings are in Drawing Interchange Format (DFX)
Download free DFX viewer here [6.7MB]