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Yanmar 2V750 Engine

The Yanmar 2V750 is an industrial-grade, heavy-duty V-twin, vertical crankshaft (or horizontal, depending on variant), 4-stroke, water-cooled diesel engine. Part of Yanmar's Vengeance series, this engine features a lightweight alloy block paired with robust cast iron cylinder heads. It utilizes an indirect injection layout with a swirl pre-combustion chamber, which optimizes the fuel-air mixture for superior combustion efficiency, reliable low-speed operation, and reduced noise and exhaust emissions. The engine is widely deployed in commercial, agricultural, and industrial applications requiring high power density and absolute reliability, such as generators, high-capacity pumps, compressors, and commercial mowers.

The cylinder head utilizes an overhead valve design (OHV) driven by a conventional pushrod and rocker arm assembly. A single, centrally positioned camshaft manages the timing sequence. Each cylinder is equipped with one intake valve and one exhaust valve. Valve clearance adjustments are performed directly at the rocker arm pivot adjusting nuts. The internal architecture consists of a vertical twin-cylinder V-configuration. Bore: 79 mm. Stroke: 76 mm. Total displacement measures 745 cc (0.75 liters).

Fuel System: The system operates on an indirect diesel injection (IDI) design utilizing Yanmar's proprietary swirl pre-combustion chambers. Fuel delivery is executed by a mechanical fuel feed pump that draws diesel through a primary water separator/filter assembly. The fuel is then supplied to a dedicated, high-pressure in-line fuel injection pump assembly governed by a mechanical flyweight system. High-pressure lines feed the mechanical fuel injection valves (injectors), which atomize the fuel directly into the pre-chambers. An integrated electrical stop solenoid controls the fuel cut-off mechanism for engine shutdown. Cold starting is assisted by integrated electrical glow plugs threaded directly into the cylinder heads.

Engine lubrication is maintained by a full-pressure, self-priming trochoid oil pump (an internal gear pump providing constant delivery capacity). Oil is drawn through an internal pickup screen and forced through a spin-on, full-flow oil filter cartridge before reaching the primary galleries. Thermal regulation is handled by a closed-loop liquid-cooling system. A belt-driven, centrifugal water pump continuously circulates coolant through the engine block jackets and cylinder heads. The circuit is governed by a wax-pellet type thermostat to ensure fast engine warm-up and stable operating temperatures under heavy duty cycles. Heat dissipation is completed via an engine-mounted or top-mounted radiator assembly backed by a mechanical cooling fan.

General Technical Data

Engine Specifications

Engine Model ............... Yanmar 2V750-CVPP
Engine Type ............... 4-cycle V-twin 2-cylinder direct injection liquid-cooled diesel
Number of Cylinders ............... 2
Cylinder Arrangement ............... V-twin 90-degree angle design
Engine Bore, in (mm) ............... 3.07 (78.0)
Engine Stroke, in (mm) ............... 3.09 (78.4)
Displacement, cu.in (L) ............... 45.7 (0.749)
Rated Engine Power, hp (kW) ............... 18.0 (13.4) at 3200 rpm
Continuous Engine Power, hp (kW) ............... 15.5 (11.6) at 3000 rpm
Rated Engine Speed, rpm ............... 3200 rpm
Maximum Low Idle Speed, rpm ............... 950-1050 rpm
Maximum High Idle Speed, rpm ............... 3400-3450 rpm
Peak Torque, lb-ft (Nm) ............... 31.7 (43.0) at 2400 rpm
Aspiration Type ............... Naturally Aspirated
Compression Ratio ............... 23.0:1
Firing Order ............... 1-2
Direction of Rotation ............... Counterclockwise looking at flywheel side
Cylinder Block Material ............... Lightweight die-cast aluminum alloy block
Cylinder Liner Type ............... Dry type cast iron integral liners
Cylinder Head Type ............... Independent cast iron heads per cylinder
Combustion Chamber ............... Direct injection toroidal crown design
Lubrication System ............... Full-pressure forced lubrication feed
Oil Pump Type ............... Trochoid self-priming internal gear pump
Oil Filter Type ............... Full-flow spin-on cartridge filtration
Cooling System ............... Liquid-cooled closed-circuit thermal bypass
Water Pump Type ............... Belt-driven centrifugal impeller pump
Air Cleaner Type ............... Heavy-duty dry dual-element filtration
Starting System ............... Electric starting motor engaging flywheel
Electrical System ............... 12V DC positive engagement
Alternator Capacity ............... 15A internal stator system

Fuel System

Fuel Injection Pump Type ............... Bosch type mini inline dual plunger pump
Fuel Injection Pump Drive ............... Camshaft gear direct mechanical actuation
Fuel Injection Valve Type ............... Multi-orifice hole nozzle assembly
Fuel Injector Nozzle Holes ............... 4 orifices pattern optimization
Fuel Injector Hole Diameter, in (mm) ............... 0.0079 (0.20)
Fuel Feed Pump Type ............... Electromagnetic solenoid plunger pump
Fuel Injection Opening Pressure, psi (MPa) ............... 2843 (19.6)
Fuel Injection Timing, deg BTDC ............... 14.0-16.0
Fuel Filter Type ............... Spin-on element with water separator sedimenter
Governor Type ............... Mechanical all-speed centrifugal weight type
Recommended Fuel Grade ............... Ultra-low sulfur diesel ASTM D975 Grade 2-D
Maximum Fuel Return Flow Rate, gph (L/h) ............... 3.17 (12.0)
Maximum Fuel Inlet Restriction, in Hg (kPa) ............... 2.95 (10.0)
Fuel Injection Plunger Diameter, in (mm) ............... 0.216 (5.5)
Fuel Injection Plunger Stroke, in (mm) ............... 0.236 (6.0)
Fuel Delivery Lines Inner Diameter, in (mm) ............... 0.059 (1.5)
Fuel Delivery Lines Outer Diameter, in (mm) ............... 0.177 (4.5)
Fuel Return Line Minimum Diameter, in (mm) ............... 0.157 (4.0)
Maximum Allowable Fuel Temperature, F (C) ............... 122.0 (50.0)
Governor Linkage Play Tolerance, in (mm) ............... 0.0019-0.0039 (0.05-0.10)
Cold Start Advance System Activation ............... Automatic mechanical lever link

Dimensions and Weight

Overall Length, in (mm) ............... 15.9 (405)
Overall Width, in (mm) ............... 16.5 (420)
Overall Height, in (mm) ............... 20.3 (515)
Dry Weight w/o Radiator, lbs (kg) ............... 113 (51)
Wet Weight with Fluids, lbs (kg) ............... 124 (56)

Maintenance Data

Service Information

Compression Pressure (Standard), psi (MPa) ............... 426.7 (2.94)
Compression Pressure (Minimum), psi (MPa) ............... 341.3 (2.35)
Compression Pressure Between Cylinders, psi (MPa) ............... 28.4 (0.196)
Oil Pressure at Idle Speed, psi (MPa) ............... 8.5 (0.059)
Oil Pressure at Rated Speed, psi (MPa) ............... 42.7 (0.294)
Oil Pressure Relief Valve Setting, psi (MPa) ............... 56.9 (0.392)
Maximum Oil Temperature in Pan, F (C) ............... 248.0 (120.0)
Thermostat Opening Valve Temperature, F (C) ............... 160.0 (71.0)
Thermostat Full Open Temperature, F (C) ............... 185.0 (85.0)
Intake Valve Clearance, Cold, in (mm) ............... 0.0059 (0.15)
Exhaust Valve Clearance, Cold, in (mm) ............... 0.0059 (0.15)

Engine Oil and Coolant

Engine Oil Type .................. SAE 30, SAE 10W-30, or SAE 15W-40
API Service Classifications ......................... CD or higher
Engine Oil Capacity with Filter, qt (L) ............... 2.32 (2.20)
Engine Oil Capacity (Upper Level), qt (L) ............... 2.11 (2.00)
Engine Oil Capacity (Lower Level), qt (L) ............... 1.48 (1.40)
Coolant Capacity (Engine Block), qt (L) ............... 1.27 (1.20)
Total Coolant Capacity, qt (L) ............... 3.17 (3.00)

Service Intervals

Change oil and filter ............... Every 150 hours
Inspect air cleaner ............... Every 50 hours
Replace air cleaner ............... Every 300 hours
Replace fuel filter ............... Every 300 hours
Valve clearance adjustment ............... Every 300 hours
Fuel system inspection ............... Every 500 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 (Grade A), in (mm) ............... 3.0708-3.0712 (78.000-78.010)
Cylinder Bore Inside Diameter (Grade B), in (mm) ............... 3.0712-3.0716 (78.010-78.020)
Main Bearing Journal Outer Diameter, in (mm) ............... 1.9685-1.9691 (50.000-50.015)
Main Bearing Clearance, in (mm) ............... 0.0011-0.0027 (0.030-0.070)
Crankpin Bearing Journal Outer Diameter, in (mm) ............... 1.6929-1.6935 (43.000-43.015)
Crankpin Bearing Clearance, in (mm) ............... 0.0011-0.0025 (0.028-0.064)
Crankshaft Axial End Play, in (mm) ............... 0.0043-0.0082 (0.11-0.21)
Connecting Rod Small End Bushing I.D, in (mm) ............... 0.8669-0.8677 (22.020-22.040)
Connecting Rod Big End Side Axial Play, in (mm) ............... 0.0059-0.0157 (0.15-0.40)
Piston Skirt Outer Diameter, in (mm) ............... 3.0685-3.0693 (77.940-77.960)
Piston to Cylinder Bore Clearance, in (mm) ............... 0.0015-0.0027 (0.040-0.070)
Piston Pin Bore Inside Diameter, in (mm) ............... 0.8661-0.8665 (22.000-22.010)
Piston Pin Outer Diameter, in (mm) ............... 0.8657-0.8661 (21.990-22.000)
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) ............... 0.0007-0.0019 (0.020-0.050)
Top Ring Groove Width, in (mm) ............... 0.0602-0.0610 (1.530-1.550)
Second Ring Groove Width, in (mm) ............... 0.0602-0.0610 (1.530-1.550)
Oil Ring Groove Width, in (mm) ............... 0.1189-0.1197 (3.020-3.040)
Top Ring Thickness, in (mm) ............... 0.0578-0.0586 (1.470-1.490)
Second Ring Thickness, in (mm) ............... 0.0578-0.0586 (1.470-1.490)
Oil Ring Thickness, in (mm) ............... 0.1169-0.1177 (2.970-2.990)
Top Ring Side Clearance, in (mm) ............... 0.0015-0.0031 (0.040-0.080)
Second Ring Side Clearance, in (mm) ............... 0.0015-0.0031 (0.040-0.080)
Oil Ring Side Clearance, in (mm) ............... 0.0011-0.0027 (0.030-0.070)
Top Ring End Gap, in (mm) ............... 0.0078-0.0137 (0.20-0.35)
Second Ring End Gap, in (mm) ............... 0.0078-0.0137 (0.20-0.35)
Oil Ring End Gap, in (mm) ............... 0.0078-0.0157 (0.20-0.40)
Cylinder Head Bottom Surface Flatness Warpage, in (mm) ............... 0.0000-0.0019 (0.00-0.05)
Cylinder Block Top Surface Flatness Warpage, in (mm) ............... 0.0000-0.0019 (0.00-0.05)
Valve Guide Inside Diameter, in (mm) ............... 0.2362-0.2367 (6.000-6.012)
Intake Valve Stem Outer Diameter, in (mm) ............... 0.2346-0.2352 (5.960-5.975)
Exhaust Valve Stem Outer Diameter, in (mm) ............... 0.2340-0.2346 (5.945-5.960)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0009-0.0020 (0.025-0.052)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0015-0.0026 (0.040-0.067)
Valve Seat Angle, degrees ............... 45.0 degrees
Valve Margin Thickness, in (mm) ............... 0.0394 (1.00)
Valve Sinkage Depth, in (mm) ............... 0.0196-0.0275 (0.50-0.70)
Valve Spring Free Length, in (mm) ............... 1.456 (37.00)
Camshaft Journal Outer Diameter, in (mm) ............... 1.4960-1.4966 (38.000-38.015)
Camshaft Bearing Clearance, in (mm) ............... 0.0011-0.0029 (0.030-0.075)
Camshaft Axial End Play, in (mm) ............... 0.0019-0.0059 (0.05-0.15)
Camshaft Cam Lobe Height (Intake), in (mm) ............... 1.4370 (36.500)
Camshaft Cam Lobe Height (Exhaust), in (mm) ............... 1.4370 (36.500)
Tappet Stem Outer Diameter, in (mm) ............... 0.4704-0.4712 (11.950-11.970)
Tappet Bore Inside Diameter, in (mm) ............... 0.4724-0.4731 (12.000-12.018)
Tappet Stem to Tappet Bore Clearance, in (mm) ............... 0.0011-0.0026 (0.030-0.068)
Rocker Arm Shaft Outer Diameter, in (mm) ............... 0.4716-0.4721 (11.982-11.995)
Rocker Arm Bushing Inside Diameter, in (mm) ............... 0.4724-0.4732 (12.000-12.020)
Rocker Arm Shaft to Bushing Clearance, in (mm) ............... 0.0001-0.0014 (0.005-0.038)

Tightening Torques

Cylinder Head Bolts (Stage One), lb-ft (Nm) ............... 18.4 (25.0)
Cylinder Head Bolts (Stage Two), lb-ft (Nm) ............... 36.8 (50.0)
Connecting Rod Cap Bolts, lb-ft (Nm) ............... 20.6 (28.0)
Flywheel Mounting Center Bolts, lb-ft (Nm) ............... 62.6 (85.0)
Main Bearing Cap Support Bolts, lb-ft (Nm) ............... 44.2 (60.0)
Crankshaft Balancer Pulley Nut, lb-ft (Nm) ............... 88.5 (120.0)
Camshaft Thrust Bearing Plate Screws, lb-ft (Nm) ............... 8.1 (11.0)
Camshaft Driven Timing Gear Bolt, lb-ft (Nm) ............... 47.9 (65.0)
Rocker Arm Shaft Support Bracket Nuts, lb-ft (Nm) ............... 20.6 (28.0)
Valve Clearance Adjusting Locknut, lb-ft (Nm) ............... 8.1 (11.0)
Rocker Cover Cap Nuts, lb-ft (Nm) ............... 6.6 (9.0)
Oil Pump Assembly Base Screws, lb-ft (Nm) ............... 8.1 (11.0)
Oil Pan Perimeter Sealing Bolts, lb-ft (Nm) ............... 8.1 (11.0)
Oil Pan Bottom Center Drain Plug, lb-ft (Nm) ............... 25.8 (35.0)
Oil Pressure Relief Valve Spindle Assembly, lb-ft (Nm) ............... 33.1 (45.0)
Oil Main Gallery Pressure Sensor Switch, lb-ft (Nm) ............... 11.0 (15.0)
Injection Pump Housing Outer Mounting Nuts, lb-ft (Nm) ............... 8.1 (11.0)
Injection High Pressure Delivery Line Nuts, lb-ft (Nm) ............... 22.1 (30.0)
Injector Assembly Clamp Bracket Bolts, lb-ft (Nm) ............... 8.1 (11.0)
Injector Nozzle Casing Internal Nut, lb-ft (Nm) ............... 36.8 (50.0)
Fuel Return Overflow Leak Off Line Union Bolt, lb-ft (Nm) ............... 11.8 (16.0)
Fuel Delivery Feed Pump Solenoid Attachment Screws, lb-ft (Nm) ............... 4.4 (6.0)
Water Pump Assembly Shell Mounting Bolts, lb-ft (Nm) ............... 8.1 (11.0)
Coolant Thermostat Housing Fasteners, lb-ft (Nm) ............... 8.1 (11.0)
Coolant Jacket Block Core Drain Plug, lb-ft (Nm) ............... 14.7 (20.0)
Air Intake Manifold Casting Attaching Bolts, lb-ft (Nm) ............... 8.1 (11.0)
Exhaust Manifold Duct Attachment Stud Nut, lb-ft (Nm) ............... 20.6 (28.0)
Starter Motor Shell Mounting Bracket Bolts, lb-ft (Nm) ............... 44.2 (60.0)
Starter Solenoid Battery Terminal Nut, lb-ft (Nm) ............... 8.8 (12.0)
Alternator Stator Charging Assembly Support Bolts, lb-ft (Nm) ............... 19.1 (26.0)
Alternator Stator Adjusting Slider Arm Bolt, lb-ft (Nm) ............... 8.1 (11.0)

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