Yanmar TS155 Specifications
| Engine Model: Yanmar TS155 |
| Engine Type: 4-stroke 1-cylinder horizontal water-cooled diesel |
| Total Displacement: 52.3 cu.in (0.86 L) |
| Rated Engine Power: 15.5 Hp (11.4 kW) at 2400 rpm |
| Fuel System Type: Indirect injection |
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The Yanmar TS155 is a high-capacity,
horizontal, single-cylinder water-cooled diesel engine from the TS
series, engineered for demanding agricultural and industrial
applications where reliability and durability are paramount. This engine
utilizes an indirect injection swirl chamber combustion system, a design
renowned for smoother combustion, reduced diesel knock, and the ability
to handle varying fuel qualities in remote or harsh environments.
Compared to the lighter TF series, the TS155 features a heavier cast
iron build, making it suitable for stationary power applications such as
large-scale irrigation pumps, heavy-duty rice hullers, industrial
generators, and agricultural tillage equipment where sustained low-speed
torque is required.
The engine operates as a four-stroke, naturally aspirated, indirect
injection diesel with a horizontal cylinder orientation.
Engine Type: Horizontal, 1-cylinder, 4-stroke, water-cooled diesel.
Combustion System: Indirect injection (swirl type / pre-combustion
chamber).
Displacement: 0.857 L (857 cc / 52.3 cu.in).
Bore: 102.0 mm (4.02 in).
Stroke: 105.0 mm (4.13 in).
Compression Ratio: 19.0:1.
Maximum Output: 11.4 kW (15.5 hp) at 2400 rpm.
Continuous Rating: 9.6 kW (13.0 hp) at 2400 rpm.
Maximum Torque: 54 Nm (5.5 kg-m / 40 lb-ft) at 1600 rpm.
Firing Order: Single cylinder (firing every 720° of crankshaft
rotation).
Direction of Rotation: Counter-clockwise (viewed from flywheel side).
Starting System: Manual hand-crank standard; electric start optional.
Fuel Tank Capacity: 14.5 L (3.83 gal).
Governor Type: Mechanical centrifugal ball-type governor.
The cylinder block is manufactured from high-grade cast iron with a
heavy sectional thickness, providing exceptional rigidity and vibration
damping for continuous stationary operation. The horizontal cylinder
orientation lowers the engine’s center of gravity and facilitates access
to the cylinder head for maintenance. The block features an integral
cast iron cylinder liner formed directly into the casting, requiring
reboring during major overhaul.
The crankcase is integrated with the cylinder block and sealed by a cast
iron side cover. Two main bearings support the crankshaft, with the
bearing caps machined integrally with the block for precise alignment.
The block incorporates water jacket cooling passages surrounding the
full cylinder length.
The cylinder head is manufactured from high-grade cast iron, matching
the block material for uniform thermal expansion. The swirl chamber
(pre-combustion chamber) is a separate insert pressed into the cylinder
head, featuring a small orifice that directs burning fuel into the main
combustion chamber with high turbulence. Valves are arranged in an
overhead configuration operated by pushrods and rocker arms from a
camshaft located within the cylinder block.
Valve Arrangement: Overhead valve (OHV), 2 valves per cylinder (1
intake, 1 exhaust).
Valve Train: Camshaft-in-block with mechanical pushrods and rocker arms.
Intake Valve Diameter: 48.0 mm (1.89 in).
Exhaust Valve Diameter: 42.0 mm (1.65 in).
Valve Stem Diameter: 8.0 mm (0.315 in).
Valve Seat Angle: Intake 45°, Exhaust 45°.
Swirl Chamber Volume: Approximately 3.2 cc.
Valve Clearance (Cold, Intake and Exhaust): 0.25 mm (0.010 in).
The cylinder head incorporates replaceable valve guides and valve seat
inserts for serviceability. A decompression lever is provided on the
cylinder head to hold the exhaust valve partially open, reducing
cranking effort for hand-starting.
The fuel system utilizes indirect injection with a swirl chamber
pre-combustion chamber. A mechanical inline injection pump, driven by
the camshaft through the governor assembly, delivers fuel at high
pressure to the injection nozzle. The mechanical centrifugal governor
maintains speed stability under varying loads, essential for generator
and pump applications.
System Type: Indirect injection with swirl (pre-combustion) chamber.
Injection Pump Type: Mechanical inline single-plunger pump.
Fuel Injection Pressure: 150 kg/cm2 (2134 psi / 14.7 MPa).
Injection Nozzle Type: Single-hole pintle type (opening pressure 120
kg/cm2).
Injection Timing: 18° before top dead center (BTDC) at rated speed.
Fuel Filter: Replaceable cartridge type with sediment bowl and water
separator.
Cold Start Aid: Glow plug in swirl chamber.
Fuel Grade: Diesel fuel meeting ISO 8210 specifications.
The injection pump incorporates a mechanical governor with a speed
adjusting lever for throttle control. The pre-combustion chamber creates
intense turbulence that promotes complete combustion despite lower
injection pressures, resulting in quieter operation than direct
injection diesels.
The lubrication system is a forced-feed, wet-sump design utilizing a
trochoid-type oil pump. This pump type provides consistent oil flow with
fewer moving parts than gear pumps, contributing to reliability in
stationary applications. Oil is drawn from the cast iron oil sump and
circulated through a full-flow replaceable cartridge oil filter before
distribution to the crankshaft, connecting rod, camshaft, and valve
train.
Lubrication Type: Forced lubrication with trochoid pump.
Total Oil Capacity: 2.9 L (3.1 qt).
Oil Grade: SAE 15W-40 or 20W-50 meeting API CF-4 or higher.
Oil Pressure (Operating): 2.0-3.5 bar (29-51 psi) at rated speed.
Oil Pump Type: Trochoid (internal gear) pump.
Oil Filter: Full-flow cartridge type.
The oil sump is mounted below the crankcase and incorporates a drain
plug. The rocker arm assembly receives oil through external pipework and
internal passages. A pressure relief valve maintains consistent oil
pressure.
The TS155 is available in two cooling configurations: the TS155H with a
hopper tank (evaporative cooling) and the TS155C with a radiator (forced
circulation cooling). Both systems are water-cooled.
Cooling Type (H variant): Hopper tank evaporative cooling (open system).
Cooling Type (C variant): Radiator cooling with forced circulation
(closed system).
Coolant Capacity (H variant): 11.0 L (2.9 gal) in hopper tank.
Coolant Capacity (C variant): 4.5 L (4.75 qt) including radiator.
Water Pump (C variant only): Belt-driven centrifugal type.
Thermostat (C variant only): 71°C (160°F) opening temperature.
Cooling Medium: Clean fresh water (H variant) or antifreeze mixture (C
variant).
The hopper tank variant relies on natural convection and evaporation,
requiring periodic refilling during operation. The radiator variant
provides more consistent temperature control and is preferred for
enclosed installations.
Decompression System: A manual decompression lever lifts the exhaust
valve slightly when starting, reducing compression pressure and allowing
the operator to spin the engine to starting speed before releasing the
lever for compression ignition.
Starting System (Electric Start Optional): A 12V electric starter motor
engages a ring gear mounted on the flywheel. A key switch and battery
are required for electric start installations.
Governor System: A mechanical flyweight governor, integrated with the
injection pump, maintains engine speed under varying load. The governor
includes a speed adjusting lever connected to a remote control or manual
throttle.
Exhaust System: A cast iron exhaust manifold directs exhaust gases to a
vertical or horizontal muffler connection. Exhaust pipe diameter is 32
mm (1.26 in).
Overall Length (Hopper H variant): 855 mm (33.7 in).
Overall Width (Hopper H variant): 420 mm (16.5 in).
Overall Height (Hopper H variant): 600 mm (23.6 in).
Dry Weight (Hopper H variant): 152 kg (335 lb).
Dry Weight (Radiator C variant): 158 kg (348 lb).
Crankshaft Height (Center to Base): 210 mm (8.3 in).
Oil Change Interval: 100 hours of operation or annually, whichever
occurs first. Use API CF-4 or higher grade oil. Oil Filter Replacement:
Every oil change. Fuel Filter Replacement: 200 hours or annually; clean
sediment bowl more frequently if contaminated fuel is suspected. Glow
Plug Check: Annually before cold season. Injection Timing Verification:
1000 hours or if starting difficulty develops.
Cooling System (C variant): Antifreeze replacement every 2 years.
Cooling System (H variant): Clean hopper tank and flush water jacket
every 200 hours to remove scale deposits. Valve Clearance Inspection:
100 hours; adjust to 0.25 mm (0.010 in) cold. Fuel Injection Nozzle
Inspection: 500 hours; replace if spray pattern is poor.
Decompression Lever Cable Inspection: Annually; ensure full engagement
and release. Air Cleaner Service: Clean foam pre-cleaner daily; replace
paper element every 50 hours. Governor Oil Bath (if equipped): Check
level every 100 hours; replace oil every 500 hours.
0Cylinder Head Nuts (Stage 1): 30 Nm (22 lb-ft).
Cylinder Head Nuts (Stage 2): 50 Nm (37 lb-ft).
Cylinder Head Nuts (Stage 3): 65 Nm (48 lb-ft).
Connecting Rod Cap Nuts: 55 Nm (41 lb-ft).
Main Bearing Cap Nuts: 80 Nm (59 lb-ft).
Flywheel Nuts: 45 Nm (33 lb-ft).
Injection Pump Mounting Nuts: 25 Nm (18 lb-ft).
Injection Nozzle Holder Nut: 60 Nm (44 lb-ft).
Rocker Arm Bracket Nuts: 25 Nm (18 lb-ft).
Intake Manifold Nuts: 20 Nm (15 lb-ft).
Exhaust Manifold Nuts: 25 Nm (18 lb-ft).
Glow Plug Nut: 15 Nm (11 lb-ft).
Oil Pan Bolts: 15 Nm (11 lb-ft).
Decompression Lever Bracket Bolts: 15 Nm (11 lb-ft).
Starter Motor Mounting Bolts (electric start option): 35 Nm (26 lb-ft).
The Yanmar TS155 engine was produced as a stationary and agricultural
power unit for applications requiring continuous-duty reliability and
low-speed torque.
Irrigation Pumps: Large-scale water pumping for agricultural irrigation,
where the engine operates for extended periods at constant speed.
Agricultural Tillage Equipment: Power source for walking tractors,
two-wheel tractors, and small cultivators where horizontal engine
orientation provides proper ground clearance.
Rice Hullers: Heavy-duty grain processing equipment requiring sustained
torque at moderate engine speeds.
Industrial Generators: Standby and prime power generation for remote
agricultural facilities and small workshops.
Small Fishing Vessels: Auxiliary power for net hauling and pot hauling
equipment on small coastal fishing boats.
Threshing Machines: Stationary agricultural processing equipment for
grain separation.
Compressors: Power for stationary air compressors used in farm
maintenance and small-scale industrial applications.
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