Yanmar 2TR17 Specifications
| Engine Model: Yanmar 2TR17 |
| Engine Type: 4-stroke 2-cylinder naturally aspirated water-cooled diesel |
| Total Displacement: 62.3 cu.in (1.02 L) |
| Rated Engine Power: 17 Hp (12.5 kW) at 2800 rpm |
| Fuel System Type: Indirect injection |
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The Yanmar 2TR17 is a heavy-duty, two-cylinder,
four-stroke marine diesel engine produced by Yanmar Co., Ltd. It
represents the higher power output configuration within the TR series,
designed for displacement hulls, utility workboats, and auxiliary power
applications where compact dimensions and fuel efficiency are
prioritized. The 2TR17 is also known for its application in agricultural
tractors, specifically the Yanmar YM1700, where it served from
approximately 1982 through 1983.
The engine features an indirect injection combustion system utilizing a
pre-combustion chamber, a configuration selected to provide smooth
operation, reduced noise, and compatibility with a wide range of diesel
fuel qualities at the time of manufacture. The vertical inline
two-cylinder layout delivers high torque at low engine speeds, a
characteristic well-suited to marine propulsion and agricultural power
take-off (PTO) applications.
Direct seawater cooling (raw water cooling) is employed in marine
installations, while the tractor variant utilizes a liquid-cooled system
with a radiator. The engine incorporates a forced lubrication system
with a trochoid-type oil pump, an electric starting system with 12V, and
a manual hand-crank backup for emergency or low-battery conditions.
The Yanmar 2TR17 is a 4-stroke, vertical inline 2-cylinder, water-cooled
diesel engine utilizing an indirect injection combustion system with a
pre-combustion chamber. Total displacement is 1.021 Liters (1,021 cc /
62.31 cu.in) in its agricultural applications, derived from a bore of
85.0 mm (3.346 in) and a stroke of 90.0 mm (3.543 in). Maximum output
(marine: 1-hour rating) is 12.5 kW (17 HP) at 2,800 RPM. Continuous
output (marine: 24-hour rating) is 11.4 kW (15.5 HP) at 2,600 RPM. For
agricultural variants, rated power is 12.7 kW (17 HP) at 2,400 RPM. The
firing order is 1-2. The engine is naturally aspirated without
turbocharging.
The cylinder block is constructed from cast iron with a vertical inline
configuration. The deep-skirt design provides rigidity for the rotating
assembly under sustained load conditions. The crankshaft is forged steel
supported by three main bearings, with integral counterweights to
balance the reciprocating forces of the two-cylinder configuration.
Connecting rods are forged steel. Pistons are cast aluminum with a
bowl-in-crown combustion chamber geometry optimized for the
pre-combustion chamber system. Piston rings include chromium-plated top
rings for wear resistance.
The cylinder head is manufactured from cast iron and features an
indirect injection combustion system with a pre-combustion chamber
(swirl chamber) for each cylinder. The valvetrain is an overhead valve
(OHV) configuration utilizing pushrods and rocker arms actuated by a
camshaft located within the cylinder block. Two valves per cylinder -
one intake and one exhaust - provide a total of four valves.
Valve clearance, measured with the engine cold, is set to 0.2 mm (0.008
in) for both intake and exhaust valves. The pre-combustion chamber
receives fuel from the injection nozzle and ignites the mixture before
flame propagation enters the main combustion chamber, reducing
combustion noise and allowing operation with lower-quality fuel.
The fuel system is an indirect injection design utilizing an inline
jerk-type injection pump manufactured by Yanmar or Zexel. The injection
pump is mechanically governed to maintain stable engine speed under
varying loads. Injection pressure is calibrated at 15.6-16.7 MPa
(160-170 kg/cm2).
The injection nozzles are pintle-type units mounted to the cylinder
head, directing fuel into the pre-combustion chambers. The fuel
filtration system incorporates a primary fuel filter with a water
separator and a secondary spin-on filter. The fuel system is not
equipped with electronic controls or common rail technology, reflecting
the engine’s design era and emphasis on mechanical simplicity.
The lubrication system is a forced circulation (pressurized) design
utilizing a trochoid-type oil pump mounted within the engine. The oil
pump draws oil from a sump through a screened pickup tube and delivers
it through a full-flow spin-on oil filter. Total oil capacity is 3.2
Liters (3.4 qt) for the complete system.
A water-cooled or seawater-cooled oil cooler is integrated into the
lubrication circuit on marine variants to maintain oil temperature under
sustained high-load operation. The lubrication circuit supplies oil to
the crankshaft main bearings, connecting rod bearings, camshaft
bearings, rocker arms, and injection pump drive components. Oil pressure
is regulated by a relief valve.
0The cooling system configuration varies by application. Marine variants
employ direct seawater cooling (raw water cooling), where seawater is
drawn through a sea strainer, circulated by a flexible-impeller rubber
pump, passed through the engine block and cylinder head water jackets,
and exhausted with the engine coolant. A thermostat maintains operating
temperature between 70-85°C (158-185°F).
Agricultural tractor variants utilize a liquid-cooled system with a
belt-driven centrifugal water pump, a cross-flow radiator, and a
thermostatically controlled cooling fan. The heat exchanger option on
marine variants segregates freshwater coolant from seawater using a
shell-and-tube heat exchanger.
Starting System: The engine is equipped with a 12V electric starter
motor with a solenoid engagement system. A manual hand-crank starting
mechanism is provided as a backup, allowing engine starting without
electrical power. A 12V, 35A alternator is driven by a belt from the
crankshaft pulley, providing charging current for the starting battery
and electrical system loads.
Governor System: A mechanical centrifugal governor, integrated into the
injection pump, maintains engine speed stability under varying load
conditions. The governor includes idle control, maximum speed limiting,
and load-sensing fuel delivery adjustment.
Exhaust System: The exhaust manifold is a cast-iron unit attached to the
cylinder head. Exhaust pipe diameter ranges from 40 mm to 50 mm
(1.57-1.97 in) depending on the manifold version and marine riser
configuration. Marine installations incorporate a water-injected exhaust
elbow to cool exhaust gases before discharge.
Transmission Interface (KH-18): The engine is designed to couple to the
KH-18 marine transmission. This unit features a mechanical cone clutch
for engagement. Available forward reduction ratios are 2.03:1, 2.48:1,
or 3.02:1, depending on the propeller and vessel application. The
reverse ratio is fixed at 3.02:1.
Overall engine dimensions reflect the compact vertical inline
two-cylinder configuration optimized for marine engine compartments and
small tractor chassis. Length measures 725 mm (28.5 in). Width measures
460 mm (18.1 in). Height measures 545 mm (21.5 in). The dry weight,
including the marine gear transmission (KH-18), is 165 kg (364 lb). The
weight of the long-block without transmission is 135 kg (298 lb).
The Yanmar 2TR17 requires adherence to specific maintenance intervals to
ensure reliable operation in marine and agricultural environments.
Engine oil and filter changes are recommended at 100 operating hours or
6 months. Valve clearance inspection and adjustment are required at
200-hour intervals, with cold clearances set to 0.2 mm (0.008 in) for
both intake and exhaust valves.
The fuel injection timing and pressure calibration require professional
service at 1,000-hour intervals or as indicated by performance
degradation. The seawater pump impeller on marine variants should be
inspected every 100 hours and replaced annually or at sign of cracking
or wear. The fuel filter should be replaced every 200 hours, with water
drained from the primary filter at each engine operation. Coolant or
seawater system flushing is recommended every 500 hours.
Compression pressure for the 2TR17 marine variant should measure 2.5-2.8
MPa (363-406 psi). The agricultural variant with 85x90 mm bore and
stroke should measure 2.2-2.5 MPa (319-363 psi). Minimum compression
pressure is 1.8 MPa (261 psi) with maximum variation between cylinders
not exceeding 0.2 MPa (29 psi). The injection nozzle opening pressure
should be checked and adjusted to 15.6-16.7 MPa (160-170 kg/cm2) at
500-hour intervals.
Cylinder Head Bolts, Step 1: 30 Nm (22 lb-ft).
Cylinder Head Bolts, Step 2: 60 Nm (44 lb-ft).
Main Bearing Cap Bolts: 55-60 Nm (41-44 lb-ft).
Connecting Rod Cap Bolts: 45-50 Nm (33-37 lb-ft).
Crankshaft Damper Pulley Bolt: 100-120 Nm (74-89 lb-ft).
Camshaft Thrust Plate Bolts: 15-20 Nm (11-15 lb-ft).
Rocker Arm Shaft Bolts: 20-25 Nm (15-18 lb-ft).
Valve Cover Bolts: 8-10 Nm (71-89 lb-in).
Intake Manifold Bolts: 15-20 Nm (11-15 lb-ft).
Exhaust Manifold Nuts: 20-25 Nm (15-18 lb-ft).
Injection Pump Mounting Nuts: 20-25 Nm (15-18 lb-ft).
Injection Nozzle Hold-Down Bolts: 25-30 Nm (18-22 lb-ft).
Oil Pan Bolts: 10-12 Nm (7-9 lb-ft).
Water Pump Mounting Bolts: 15-20 Nm (11-15 lb-ft).
Flywheel Bolts: 45-50 Nm (33-37 lb-ft).
Engine Mount Bracket Bolts: 40-45 Nm (30-33 lb-ft).
The Yanmar 2TR17 engine was deployed across marine propulsion, auxiliary
power, and agricultural equipment applications from approximately 1976
through the mid-1980s.
Marine Propulsion: The 2TR17 served as an inboard diesel engine for
displacement hulls up to 8 meters (26 feet) in length, including fishing
vessels, utility workboats, and sailboat auxiliaries. The engine was
paired with the KH-18 marine transmission in direct-drive or
reduction-gear configurations.
Yanmar YM1700 Tractor: The agricultural variant of the 2TR17 powered the
YM1700 compact utility tractor, produced from 1982 through 1983. The
engine delivered 12.7 kW (17 HP) at 2,400 RPM in this application,
driving an 8-forward, 2-reverse manual transmission and a rear power
take-off (PTO) rated at 540/750/1,000 RPM.
Generator Drive (Genset): The 2TR17 was adapted for stationary generator
applications, providing primary or standby power at continuous ratings
appropriate to the engine’s 15.5 HP (11.4 kW) continuous output
specification.
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| Industrial Engines Technical Specifications |
| Car Engines Technical Specifications |
| Small Engines Technical Specifications |
| Outboard Engines Technical Specifications |
