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Yanmar 2TR13A Engine

The Yanmar 2TR13A is an industrial-grade, vertical, 2-cylinder inline, four-stroke diesel engine. It was most notably deployed as the primary power plant for compact utility tractors, such as the Yanmar YM155 series. Engineered for long-term reliable service in agriculture and light industrial applications, this naturally aspirated unit features a cast-iron engine block and an integrated swirl pre-combustion chamber design, allowing for highly optimized thermal efficiency and smooth low-end torque.

The engine employs an overhead valve (OHV) arrangement actuated via a classic pushrod system. It utilizes a single gear-driven camshaft located within the cylinder block to operate two valves per cylinder (one intake, one exhaust) through a conventional rocker arm shaft assembly. The total engine displacement is 40.4 cubic inches (662 cc). The cylinder dimensions feature a symmetrical square profile with a bore of 2.95 inches (75 mm) and a stroke of 2.95 inches (75 mm). Lubrication is managed via a forced-circulation pressure system coupled with standard splash lubrication. A mechanical trochoid pump drives the engine oil through internal galleries to supply the main bearings, crankshaft journals, and camshaft assemblies. The unit uses a liquid-cooled system utilizing forced-circulation water. Main components include an engine-driven centrifugal water pump, a heavy-duty radiator core, and an integrated sub-tank reservoir.

The fuel system uses a dedicated mechanical inline injection pump with individual plunger barrels for each cylinder. It features an all-speed mechanical governor system to regulate fuel metering relative to load requirements. Fuel delivery flows from tank through a primary line, passing through a fuel water separator setup before reaching the fuel injection pump. The fuel control rack manages fuel volume delivery via individual fuel control pinions and sleeves, sending pressurized fuel through rigid high-pressure lines to the mechanical fuel injection valves (injectors) inside the swirl pre-combustion chamber. Excess fuel is returned back to the fuel loop through a dedicated return-line infrastructure.

General Technical Data

Engine Specifications

Engine Model ............... Yanmar 2TR13A
Engine Type ............... 4-cycle vertical inline 2-cylinder liquid-cooled diesel
Number of Cylinders ............... 2
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 2.953 (75.0)
Engine Stroke, in (mm) ............... 2.953 (75.0)
Displacement, cu.in (L) ............... 40.4 (0.7)
Rated Engine Power, hp (kW) ............... 15-16 (11.2-11.9)
Rated Engine Speed, rpm ............... 2700
Peak Torque ............... 33.2 Nm (24.5 lb-ft) at 1800 rpm
Idle Speed ............... 800-900 rpm
Aspiration Type ............... Naturally Aspirated
Operating Speed ............... 2200-2700 rpm
Compression Ratio ............... 23.1:1
Firing Order ............... 1-2
Combustion System ............... Swirl chamber or swirl type pre-combustion
Main Bearing Type ............... Precision insert shell bearings
Camshaft Drive ............... Gear-driven mechanical assembly
Valves Per Cylinder ............... 2 valves per cylinder head config
Cylinder Block Type ............... Cast iron
Cylinder Head Type ............... Cast iron
Lubrication System ............... Full-pressure forced lubrication
Oil Pump Type ............... Trochoid gear-driven pump
Oil Filter Type ............... Full-flow, spin-on cartridge type
Cooling System ............... Liquid-cooled with radiator
Water Pump Type ............... Belt-driven centrifugal pump
Air Cleaner Type ............... Dry element dual stage cleaner
Starting System ............... Electric starter
Electrical System ............... 12V
Alternator Capacity ............... 15A or 20A

Fuel System

Injection Pump Model ............... Yanmar Bosch Type Deck Pump
Injection Pump Type ............... In-line jerk type multi-plunger system
Injection Plunger Diameter, in (mm) ............... 0.236 (6.0)
Injection Plunger Stroke, in (mm) ............... 0.275 (7.0)
Injection Nozzle Type ............... Throttle type nozzle configuration
Injection Opening Pressure, psi (bar) ............... 1990-2133 (137-147)
Fuel Injection Timing ............... 22 degrees BTDC
Fuel Filter Model ............... Spin-on replaceable element canister
Fuel Transfer Pump Pressure, psi (bar) ............... 2.9-4.3 (0.2-0.3)
Fuel Consumption Rate, g/kWh (g/hph) ............... 245 (182)
Nozzle Holder Type ............... Flange mounted nut clamp socket
Governor Type ............... Mechanical all-speed centrifugal governor
Fuel Lift Pump Type ............... Mechanical diaphragm type unit
Fuel Leak-off System ............... Overhead gallery tube return circuit
Fuel Feed Line Diameter, in (mm) ............... 0.236 (6.0)
Fuel Injection Pipe Outer Diameter, in (mm) ............... 0.236 (6.0)
Fuel Injection Pipe Inner Diameter, in (mm) ............... 0.078 (2.0)
Injection Spray Angle ............... 4 deg upward axis tilt plane
Plunger Clearance Limit, in (mm) ............... 0.00019 (0.005)
Delivery Valve Opening Pressure, psi (bar) ............... 426-568 (29.4-39.2)
Nozzle Needle Valve Diameter, in (mm) ............... 0.157 (4.0)
Nozzle Needle Valve Lift, in (mm) ............... 0.0118 (0.3)
Injection Pump Rack Travel, in (mm) ............... 0.472 (12.0)
Fuel Specification Std ............... ASTM D975 No. 2-D diesel grade
Priming Pump Type ............... Hand operated mechanical plunger knob

Dimensions and Weight

Overall Engine Length, in (mm) ............... 21.65 (550.0)
Overall Engine Width, in (mm) ............... 18.11 (460.0)
Overall Engine Height, in (mm) ............... 23.22 (590.0)
Dry Engine Mass, lb (kg) ............... 242.5 (110.0)
Wet Engine Mass, lb (kg) ............... 255.7 (116.0)

Maintenance Data

Service Information

Compression Pressure Standard, psi (bar) ............... 426-455 (29.4-31.3)
Minimum Compression Pressure, psi (bar) ............... 355 (24.5)
Compression Pressure Between Cylinders, psi (bar) ............... 28.4 (1.96)
Oil Pressure at Idle Speed, psi (bar) ............... 11.3 (0.78)
Oil Pressure at Rated Speed, psi (bar) ............... 42.6-56.8 (2.94-3.92)
Cooling System Pressure Cap, psi (bar) ............... 12.8 (0.88)
Thermostat Opening Temperature, F (C) ............... 158-165 (70-74)
Thermostat Full Open Temperature, F (C) ............... 185 (85)
Maximum Allowable Coolant Temperature, F (C) ............... 203 (95)
Fan Belt Deflection, Standard, in (mm) ............... 0.39-0.59 (10.0-15.0)
Intake Valve Clearance, Cold, in (mm) ............... 0.008 (0.203)
Exhaust Valve Clearance, Cold, in (mm) ............... 0.008 (0.203)

Engine Oil and Coolant

Engine Oil Type .................. SAE 30, SAE 10W-30, or SAE 10W
API Service Classifications ......................... CC or CD
Engine Oil Capacity, qts (L) ............... 2.1 (2.0)
Cooling Liquid Capacity, qts (L) ............... 3.4 (3.2)

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 300 hours
Valve clearance adjustment ............... Every 300 hours
Fuel system inspection ............... Every 600 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 Liner Bore Inside Diameter, Std, in (mm) ............... 2.9527-2.9535 (75.000-75.020)
Cylinder Liner Bore Inside Diameter, Wear Limit, in (mm) ............... 2.9574 (75.120)
Cylinder Liner Out of Roundness, in (mm) ............... Less than 0.0003 (0.010)
Connecting Rod Small End Bushing I.D, in (mm) ............... 0.9059-0.9066 (23.010-23.030)
Crankshaft Main Journal Outside Diameter, in (mm) ............... 1.9673-1.9681 (49.970-49.990)
Main Journal Bearing Shell Thickness, in (mm) ............... 0.0787-0.0791 (2.000-2.010)
Crankshaft Main Journal Bearing Clearance, in (mm) ............... 0.0015-0.0031 (0.040-0.080)
Crankpin Outside Diameter, in (mm) ............... 1.7704-1.7712 (44.970-44.990)
Connecting Rod Big End Bearing Clearance, in (mm) ............... 0.0013-0.0029 (0.035-0.075)
Crankshaft End Play, in (mm) ............... 0.0039-0.0098 (0.100-0.250)
Connecting Rod Big End Side Play, in (mm) ............... 0.0039-0.0118 (0.100-0.300)
Piston Skirt Outside Diameter, in (mm) ............... 2.9492-2.9500 (74.910-74.930)
Piston to Cylinder Liner Clearance, in (mm) ............... 0.0027-0.0043 (0.070-0.110)
Piston Pin Bore Inside Diameter, in (mm) ............... 0.9055-0.9059 (23.000-23.010)
Piston Pin Outside Diameter, in (mm) ............... 0.9051-0.9055 (22.990-23.000)
Piston Pin to Piston Pin Bore Clearance, in (mm) ............... 0.0000-0.0007 (0.000-0.020)
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 (2.000)
Second Ring Groove Width, in (mm) ............... 0.0787 (2.000)
Oil Ring Groove Width, in (mm) ............... 0.1574 (4.000)
Top Ring Side Clearance, in (mm) ............... 0.0027-0.0041 (0.070-0.105)
Second Ring Side Clearance, in (mm) ............... 0.0019-0.0033 (0.050-0.085)
Oil Ring Side Clearance, in (mm) ............... 0.0011-0.0025 (0.030-0.065)
Top Ring End Gap, in (mm) ............... 0.0078-0.0157 (0.200-0.400)
Second Ring End Gap, in (mm) ............... 0.0059-0.0137 (0.150-0.350)
Oil Ring End Gap, in (mm) ............... 0.0059-0.0137 (0.150-0.350)
Cylinder Block Distortion Upper Deck Surface, in (mm) ............... 0.0011 (0.030)
Intake Valve Stem Outside Diameter, in (mm) ............... 0.2736-0.2742 (6.950-6.965)
Exhaust Valve Stem Outside Diameter, in (mm) ............... 0.2716-0.2724 (6.900-6.920)
Intake Valve Guide Inside Diameter, in (mm) ............... 0.2755-0.2761 (7.000-7.015)
Exhaust Valve Guide Inside Diameter, in (mm) ............... 0.2755-0.2761 (7.000-7.015)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0013-0.0025 (0.035-0.065)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0031-0.0045 (0.080-0.115)
Valve Seat Width, in (mm) ............... 0.0472-0.0590 (1.200-1.500)
Valve Seat Angle, Degrees ............... 45
Valve Spring Free Lenght, in (mm) ............... 1.6535 (42.000)
Camshaft Journal Outside Diameter (Front), in (mm) ............... 1.5732-1.5740 (39.960-39.980)
Camshaft Journal Outside Diameter (Center), in (mm) ............... 1.5338-1.5346 (38.960-38.980)
Camshaft Journal Outside Diameter (Rear), in (mm) ............... 1.4944-1.4952 (37.960-37.980)
Camshaft Journal Bearing Oil Clearance, in (mm) ............... 0.0019-0.0039 (0.050-0.100)
Intake Cam Lobe Height, in (mm) ............... 1.3366-1.3385 (33.950-34.000)
Exhaust Cam Lobe Height, in (mm) ............... 1.3366-1.3385 (33.950-34.000)
Rocker Arm Shaft Outside Diameter, in (mm) ............... 0.5492-0.5500 (13.950-13.970)
Rocker Arm Bushing Inside Diameter, in (mm) ............... 0.5511-0.5523 (14.000-14.030)
Rocker Arm Shaft to Bushing Clearance, in (mm) ............... 0.0011-0.0031 (0.030-0.080)
Tappet Body Outside Diameter, in (mm) ............... 0.4712-0.4720 (11.970-11.990)
Tappet Guide Hole Inside Diameter, in (mm) ............... 0.4724-0.4731 (12.000-12.018)
Tappet to Guide Hole Clearance, in (mm) ............... 0.0003-0.0018 (0.010-0.048)

Tightening Torques

Cylinder Head Stud Bolts ............... 54-58 lb-ft (73-79 Nm)
Connecting Rod Cap Bolts ............... 33-36 lb-ft (45-49 Nm)
Main Bearing Cap Bolts ............... 58-62 lb-ft (79-84 Nm)
Flywheel Mounting Fastener Bolts ............... 61-65 lb-ft (83-88 Nm)
Crankshaft Pulley End Lock Bolt ............... 65-72 lb-ft (88-98 Nm)
Camshaft Gear Center Thrust Nut ............... 43-51 lb-ft (59-69 Nm)
Injection Pump Gear Attachment Nut ............... 43-51 lb-ft (59-69 Nm)
Rocker Arm Shaft Support Mounting Bolt ............... 18-22 lb-ft (24-30 Nm)
Valve Cover Bonnet Fastener Cap Nuts ............... 4.3-5.8 lb-ft (5.9-7.9 Nm)
Oil Pan Basin Bottom Perimeter Bolts ............... 5.1-6.5 lb-ft (6.9-8.8 Nm)
Gear Case Front Housing Coverage Bolt ............... 14-18 lb-ft (19-24 Nm)
Flywheel Housing Perimeter Attachment Bolts ............... 33-39 lb-ft (45-53 Nm)
Fuel Injection Nozzle Clamp Holder Assembly Bolt ............... 14-18 lb-ft (19-24 Nm)
Fuel Injection Pipe Union Swivel Nut ............... 22-25 lb-ft (30-34 Nm)
Fuel Injection Pump Housing Flange Nuts ............... 14-18 lb-ft (19-24 Nm)
Delivery Valve Holder Seal Ring Nut ............... 29-33 lb-ft (39-45 Nm)
Oil Pressure Switch Sensor ............... 11-14 lb-ft (15-19 Nm)
Water Pump Assembly Face Bolts ............... 14-18 lb-ft (19-24 Nm)
Thermostat Housing Case Retention Bolt ............... 14-18 lb-ft (19-24 Nm)
Exhaust Manifold Structural Heat Flange Nut ............... 18-22 lb-ft (24-30 Nm)
Air Intake Inlet Manifold Attachment Base Bolts ............... 14-18 lb-ft (19-24 Nm)
Oil Drain Plug ............... 36-43 lb-ft (49-59 Nm)
Fuel Filter Housing Center Bracket Mounting Bolt ............... 14-18 lb-ft (19-24 Nm)
Starter Motor Body Mounting Frame Flange Bolts ............... 29-36 lb-ft (39-49 Nm)
Alternator Charging Bracket Pivoting Support Bolt ............... 29-36 lb-ft (39-49 Nm)
Alternator Tension Link Adjusting Locking Screw ............... 14-18 lb-ft (19-24 Nm)
Glow Plug Electrical Wiring Harness Terminal Nut ............... 0.7-1.1 lb-ft (1.0-1.5 Nm)
Rocker Arm Valve Clearance Adjuster Screw Jam Nut ............... 11-14 lb-ft (15-19 Nm)
Fuel Pump Diaphragm Actuator Lever Body Fasteners ............... 2.9-4.3 lb-ft (3.9-5.9 Nm)
Oil Strainer Intake Pickup Tube Mounting Internal Bolt ............... 14-18 lb-ft (19-24 Nm)
Oil Pump Assembly Cover Sealing Plate Screws ............... 4.3-5.8 lb-ft (5.9-7.9 Nm)
Idler Gear Shaft Secure Support Plate Bolt ............... 18-22 lb-ft (24-30 Nm)
Breather Valve Chamber Shell Cover Screw ............... 2.1-2.9 lb-ft (2.9-3.9 Nm)
Fan Pulley Extension Hub Shaft Attachment Nut ............... 36-43 lb-ft (49-59 Nm)
Radiator Core Mount Stay Brace Framework Bolts ............... 11-14 lb-ft (15-19 Nm)
Fuel Return Line Overhead Banjo Connector Bolt ............... 5.8-7.2 lb-ft (7.9-9.8 Nm)
Fuel Feed Supply Mechanical Line Banjo Bolt ............... 18-22 lb-ft (24-30 Nm)

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• Yanmar Engines Specs
  
• Yanmar 2TR13 Specs
  
• Yanmar 2TR15 Specs
  
• Yanmar 2TR16 Specs
  
• Yanmar 2TR17 Specs
  
• Yanmar 2TR20A Specs
  

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