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Yanmar 2TR13 Engine

The Yanmar 2TR13 is a compact, vertical, water-cooled, 4-cycle compression-ignition diesel engine featuring a two-cylinder inline configuration. Engineered primarily for light industrial machinery and compact utility tractors like the Yanmar YM1300 and YM155, this naturally aspirated power unit is recognized for its high torque-to-weight ratio, mechanical simplicity, and heavy-duty casting construction. It utilizes a pre-combustion chamber design that facilitates smooth combustion and reliable cold-weather starting when paired with thermal starting aids.

The cylinder block uses a one-piece casting with replaceable semi-finished cylinder liners. The cylinder head employs a standard overhead valve (OHV) configuration, with one intake valve and one exhaust valve per cylinder actuated by pushrods and rocker arms driven by a gear-driven camshaft. Compression Ratio: 23:1 nominal compression ratio. Bore: 75 mm (2.953 inches). Stroke: 75 mm (2.953 inches). Total Displacement: 40.4 cubic inches (662 cc / 0.7 liters).

The fuel delivery infrastructure is a purely mechanical system designed for precise metered atomization into the pre-combustion chambers. Fuel flows from the supply tank through a primary sediment bowl and replaceable element fuel filter to clear impurities. A deck-mounted, inline mechanical fuel injection pump pressurizes the fuel. This injection pump contains individual plunger and barrel assemblies for each cylinder, regulated by a mechanical governor-controlled fuel control rack to equalize fuel delivery volumes. High-pressure steel fuel lines transport the metered fuel to the fuel injection valves (nozzles), which inject an atomized spray pattern in proper firing sequence. Internal fuel leakage or bypass from the injection nozzles is safely routed back to the fuel tank via a low-pressure fuel return line.

The engine relies on a fully pressurized forced lubrication system driven by an internal oil pump. Oil is drawn from the lower crankcase oil pan through a pickup screen, forced through a spin-on oil filter, and routed via internal oil galleries to the main bearings, connecting rod journals, and rocker arm assembly. Thermal regulation is managed by a closed-loop, liquid-cooled system. A belt-driven centrifugal water pump circulates coolant through the cylinder block and cylinder head water jackets to an external radiator. System temperature is regulated by a mechanical pellet-type thermostat that limits flow to the radiator during engine warm-up.

General Technical Data

Engine Specifications

Engine Model ............... Yanmar 2TR13
Engine Series ............... TR Series Small-Scale Diesel
Engine Type ............... 4-cycle inline 2-cylinder overhead valve liquid-cooled diesel
Number of Cylinders ............... 2
Cylinder Arrangement ............... Vertical in-line
Engine Bore, in (mm) ............... 2.953 (75.0)
Engine Stroke, in (mm) ............... 2.953 (75.0)
Total Displacement, cu.in (L) ............... 40.45 (0.663)
Rated Power, hp (kW) ............... 13.0-15.0 (9.7-11.2)
Maximum Rated Speed, rpm ............... 2700
Maximum Torque, lb-ft (Nm) ............... 28.9 (39.2) at 2200 rpm
Low Idle Speed, rpm ............... 700-800
High Idle Speed, rpm ............... 2850-2900
Aspiration Type ............... Natural aspiration
Compression Ratio ............... 23.0:1
Engine Firing Order ............... 1-2
Combustion Chamber ............... Swirl pre-combustion chamber type
Rotation Direction ............... Counterclockwise viewed from flywheel end
Cylinder Block Architecture ............... Monoblock cast iron composition
Cylinder Head Design ............... Single-piece cast iron structure
Cylinder Liner Concept ............... Parent bore integral cast sleeve design
Main Bearing Configuration ............... 3 main journal bearings
Lubrication System ............... Full-pressure internal gallery distribution
Oil Pump Type ............... Trochoid type gear-driven assembly
Oil Filtration Type ............... Full-flow spin-on cartridge filtration
Cooling System ............... Pressurized forced liquid cooling circuit
Water Pump Type ............... Belt-driven centrifugal impeller type
Exhaust Pipe Config ............... Horizontal or vertical upward optional path
Cleaner System ............... Dry element dual-stage cyclonic filtration
Starting System ............... Electric starting motor assembly
Electrical System, V ............... 12
Charging Alternator, A ............... 15-35

Fuel System

Fuel Injection Pump Model ............... Yanmar Bosch type deck-mounted inline
Fuel Injection Pump Mechanism ............... Plunger and barrel positive displacement jerk
Number of Injection Pump Outlets ............... 2 parallel high-pressure outlets
Fuel Injection Nozzle Holder ............... Flange-mounted multi-stud retention unit
Fuel Injection Nozzle Body ............... Throttle type pin expansion design
Fuel Injection Opening Pressure, psi (bar) ............... 1990-2130 (137.2-147.0)
Fuel Feed Pump Architecture ............... Mechanical diaphragm lift assembly
Fuel Feed Pump Actuation ............... Camshaft eccentric lobe mechanical action
Fuel Filter Core Element ............... Replaceable paper cartridge element
Fuel Filter Housing Concept ............... Clear sediment bowl assembly with water trap
Fuel System Venting Mechanism ............... Manual air bleed screws on filter and pump head
Maximum Fuel Injection Angle, deg ............... 22.0-24.0 BTDC
Fuel Return Circuit Layout ............... Low-pressure spill pipe back to storage tank
Recommended Fuel Grade ............... ASTM D975 number 2-D ultra-low sulfur diesel
Fuel Injection Pipe Inner Diameter, in (mm) ............... 0.078 (2.0)
Fuel Injection Pipe Outer Diameter, in (mm) ............... 0.236 (6.0)
Governor Type ............... Mechanical centrifugal all-speed mechanism

Dimensions and Weight

Overall Length, in (mm) ............... 19.9 (505)
Overall Width, in (mm) ............... 18.1 (460)
Overall Height, in (mm) ............... 22.6 (575)
Dry Weight, lbs (kg) ............... 243 (110)
Wet Weight, lbs (kg) ............... 258 (117)

Maintenance Data

Service Information

Compression Pressure at 250 rpm, psi (bar) ............... 398.2-426.6 (28.0-30.0)
Minimum Allowed Compression Pressure, psi (bar) ............... 341.3 (24.0)
Oil Pressure at Rated Speed, psi (bar) ............... 42.6-56.8 (3.0-4.0)
Oil Pressure at Low Idle, psi (bar) ............... 9.94-14.2 (0.7-1.0)
Oil Pressure Switch Activation, psi (bar) ............... 7.11 (0.5)
Thermostat Opening Start Temperature, F (C) ............... 158.0 (70.0)
Thermostat Full Open Temperature, F (C) ............... 185.0 (85.0)
Cooling Fan Belt Deflection Tension, in (mm) ............... 0.39-0.59 (10.0-15.0)
Intake Valve Cold Clearance, in (mm) ............... 0.0078 (0.20)
Exhaust Valve Cold Clearance, in (mm) ............... 0.0078 (0.20)

Engine Oil and Coolant

Engine Oil Type .................. SAE 30, SAE 10W-30, or 15W-40
API Service Classifications ......................... CC or CD
Engine Oil Sump Capacity, qts (L) ............... 2.11 (2.0)
Engine Oil Capacity with Filte, qts (L) ............... 2.32 (2.2)
Cooling System Fluid Capacity, qts (L) ............... 3.17 (3.0)

Service Intervals

Change oil and filter ............... Every 200 hours
Inspect air cleaner ............... Every 50 hours
Replace air cleaner ............... Every 250 hours
Replace fuel filter ............... Every 200 hours
Valve clearance adjustment ............... Every 300 hours
Fuel system inspection ............... Every 1000 hours
Change coolant ............... Every 1000 hours
Compression test ............... Every 1000 hours
Clean radiator core ............... Every 200 hours
Inspect belt tension ............... Every 100 hours

Service Specifications

Cylinder Bore Inside Diameter, in (mm) ............... 2.9527-2.9535 (75.000-75.020)
Cylinder Bore Maximum Out-of-Round, in (mm) ............... 0.0007 (0.020)
Cylinder Bore Maximum Taper, in (mm) ............... 0.0011 (0.030)
Connecting Rod Small End Bushing I.D, in (mm) ............... 0.9059-0.9066 (23.010-23.030)
Crankshaft Main Journal Diameter, in (mm) ............... 1.9675-1.9685 (49.975-50.000)
Crankshaft Main Bearing Oil Clearance, in (mm) ............... 0.0015-0.0035 (0.040-0.090)
Crankpin Journal Diameter, in (mm) ............... 1.7706-1.7716 (44.975-45.000)
Connecting Rod Big End Bearing Clearance, in (mm) ............... 0.0013-0.0031 (0.035-0.080)
Crankshaft End Play, in (mm) ............... 0.0035-0.0078 (0.090-0.200)
Piston Skirt Outer Diameter, in (mm) ............... 2.9496-2.9507 (74.920-74.950)
Piston to Cylinder Wall Clearance, in (mm) ............... 0.0019-0.0039 (0.050-0.100)
Piston Pin Bore Inside Diameter, in (mm) ............... 0.9055-0.9061 (23.000-23.015)
Piston Pin Outer Diameter, in (mm) ............... 0.9051-0.9055 (22.990-23.000)
Piston Pin to Piston Pin Bore Clearance, in (mm) ............... 0.0000-0.0009 (0.000-0.025)
Piston Pin to Small End Bushing Clearance, in (mm) ............... 0.0003-0.0015 (0.010-0.040)
Top Ring Groove Width, in (mm) ............... 0.0787-0.0795 (2.000-2.020)
Second Ring Groove Width, in (mm) ............... 0.0787-0.0795 (2.000-2.020)
Oil Ring Groove Width, in (mm) ............... 0.1574-0.1582 (4.000-4.020)
Top Ring Side Clearance, in (mm) ............... 0.0027-0.0043 (0.070-0.110)
Second Ring Side Clearance, in (mm) ............... 0.0019-0.0035 (0.050-0.090)
Oil Ring Side Clearance, in (mm) ............... 0.0011-0.0027 (0.030-0.070)
Top Ring End Gap, in (mm) ............... 0.0078-0.0137 (0.200-0.350)
Second Ring End Gap, in (mm) ............... 0.0059-0.0118 (0.150-0.300)
Oil Ring End Gap, in (mm) ............... 0.0078-0.0157 (0.200-0.400)
Cylinder Head Lower Surface Flatness Distortion, in (mm) ............... 0.0019 (0.050)
Cylinder Block Upper Deck Face Flatness Distortion, in (mm) ............... 0.0019 (0.050)
Intake Valve Stem Outer Diameter, in (mm) ............... 0.2736-0.2744 (6.950-6.970)
Exhaust Valve Stem Outer Diameter, in (mm) ............... 0.2724-0.2732 (6.920-6.940)
Intake Valve Guide Inner Diameter, in (mm) ............... 0.2755-0.2763 (7.000-7.020)
Exhaust Valve Guide Inner Diameter, in (mm) ............... 0.2755-0.2763 (7.000-7.020)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0011-0.0027 (0.030-0.070)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0023-0.0039 (0.060-0.100)
Valve Seat Width, in (mm) ............... 0.0472-0.0590 (1.200-1.500)
Valve Face Angle, deg ............... 45.0
Valve Seat Angle, deg ............... 45.0
Valve Spring Free Length, in (mm) ............... 1.653 (42.0)
Camshaft Journal Outer Diameter, in (mm) ............... 1.5738-1.5748 (39.975-40.000)
Camshaft Journal Bearing Clearance, in (mm) ............... 0.0019-0.0039 (0.050-0.100)
Cam Lobe Height, in (mm) ............... 1.3385-1.3425 (34.000-34.100)

Tightening Torques

Cylinder Head Bolts, lb-ft (Nm) ............... 54.2-57.8 (73.5-78.5)
Connecting Rod Cap Bolts, lb-ft (Nm) ............... 25.3-28.9 (34.3-39.2)
Main Bearing Cap Bolts, lb-ft (Nm) ............... 57.8-61.4 (78.5-83.3)
Flywheel Center Bolts, lb-ft (Nm) ............... 61.4-65.1 (83.3-88.2)
Crankshaft V-Pulley End Nut, lb-ft (Nm) ............... 72.3-79.5 (98.0-107.8)
Camshaft Thrust Plate Fasteners, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Timing Gear Case Covering Fasteners, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Rocker Arm Shaft Support Nuts, lb-ft (Nm) ............... 21.6-25.3 (29.4-34.3)
Rocker Arm Adjustment Screw Jam Nuts, lb-ft (Nm) ............... 10.8-14.4 (14.7-19.6)
Oil Pan Sump Perimeter Drain Plug, lb-ft (Nm) ............... 36.1-43.3 (49.0-58.8)
Oil Pan Housing Mounting Fasteners, lb-ft (Nm) ............... 7.2-10.8 (9.8-14.7)
Fuel Injection Pump Deck Mounting Nuts, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Fuel Injection Nozzle Flange Hold-Down Bolts, lb-ft (Nm) ............... 7.2-10.8 (9.8-14.7)
Fuel High-Pressure Injection Line Gland Nuts, lb-ft (Nm) ............... 18.0-21.6 (24.5-29.4)
Fuel Return Overflow Leak Pipe Banjo Fasteners, lb-ft (Nm) ............... 7.2-10.8 (9.8-14.7)
Exhaust Manifold Port Fasteners, lb-ft (Nm) ............... 18.0-21.6 (24.5-29.4)
Intake Manifold Air Distribution Fasteners, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Water Pump Base Attachment Bolts, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Cooling System Water Outlet Thermostat Housing, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Oil Filter Threaded Center Stud, lb-ft (Nm) ............... 14.4-21.6 (24.5-29.4)
Starter Motor Shell Flange Studs, lb-ft (Nm) ............... 28.9-36.1 (39.2-49.0)
Alternator Pivot Frame Bolt, lb-ft (Nm) ............... 14.4-21.6 (24.5-29.4)
Alternator Adjusting Arm Bolt, lb-ft (Nm) ............... 10.8-14.4 (14.7-19.6)
Flywheel Housing Rear Plate Fasteners, lb-ft (Nm) ............... 25.3-32.5 (34.3-44.1)
Decompression Assembly Shaft Set Screw, lb-ft (Nm) ............... 5.0-7.2 (6.8-9.8)
Oil Pressure Sensor Sending Assembly Port, lb-ft (Nm) ............... 10.8-14.4 (14.7-19.6)
Water Drain Cock Assembly Cock Block, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Glow Plug Preheater Assembly Body, lb-ft (Nm) ............... 14.4-18.0 (19.6-24.5)
Engine Lifting Lug Upper Plate Anchors, lb-ft (Nm) ............... 18.0-21.6 (24.5-29.4)
Crankcase Breather Assembly Shell Screws, lb-ft (Nm) ............... 5.0-7.2 (6.8-9.8)

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• Yanmar Engines Specs
  
• Yanmar 2TR13A Specs
  
• Yanmar 2TR15 Specs
  
• Yanmar 2TR16 Specs
  
• Yanmar 2TR17 Specs
  
• Yanmar 2TR20A Specs
  

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