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International D155 Engine

The International Harvester D155 is a heavy-duty, 3-cylinder, naturally aspirated, atmospheric diesel engine. Part of the legendary Neuss engine family, it is renowned globally for its highly robust, overhead-valve architecture and exceptional longevity in demanding agricultural and industrial environments. The engine utilizes a direct injection combustion system and wet-type replaceable cylinder sleeves, ensuring ease of maintenance during complete mechanical overhauls. It serves as a core powerplant for various Case IH and International Harvester equipment, including the 385, 433, and 533 tractor series.

The cylinder head utilizes an overhead valve (OHV) layout actuated by a camshaft located in the engine block. Motion is transmitted through a standard pushrod and mechanical rocker arm assembly. It features two valves per cylinder (one intake and one exhaust) for a total of 6 valves. Periodic service requires manual valve lash adjustments at the rocker arm adjusting screws. The dimensions consist of a bore of 98.4 mm (3.87 in) and a stroke of 111.1 mm (4.37 in). Total displacement measures 2536 cc (155 cubic inches).

Fuel System: The fuel distribution setup incorporates a Robert Bosch EP/VA or VE distributor-type mechanical injection pump. The pump is timed precisely to the engine stroke sequence via the front timing gear assembly. It draws fuel through a primary and secondary filtering configuration, delivery lines, and pushes highly pressurized diesel directly into multi-orifice injection nozzle holders positioned in the cylinder head. An integrated mechanical governor modulates the fuel rack position relative to engine loading to maintain the set operating speed.

Lubrication System: Engine components rely on a highly pressurized, full-flow lubrication system. An engine oil pump is mounted low at the front of the crankcase block and is driven directly by the timing gear train off the crankshaft. Oil passes through a replaceable full-flow oil filter element before reaching the main crankshaft journals, camshaft bearings, and overhead valve lever mechanism. Piston pins and lower cylinder liner surfaces are cooled and lubricated via precise spray lubrication.

Cooling System: Thermal regulation is sustained through a high-capacity, closed-circuit liquid cooling system. The system incorporates a centrifugal water pump driven by a V-belt connected to the crankshaft pulley. A front-mounted thermostat acts as the distribution valve to divert coolant between the bypass circuit and the radiator matrix based on operating temperature.

General Technical Data

Engine Specifications

Engine Model ............... International Harvester D155
Engine Type ............... 4-cycle inline 3-cylinder direct injection liquid-cooled diesel
Number of Cylinders ............... 3
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 3.875 (98.425)
Engine Stroke, in (mm) ............... 4.375 (111.125)
Displacement, cu.in (L) ............... 154.5 (2.53)
Rated Engine Power, hp (kW) ............... 42-45 (31.3-33.6) at 2200 rpm
Rated Engine Speed, rpm ............... 2200
Peak Torque ............... 150-160 Nm (111-118 lb-ft) at 1400-1600 rpm
Idle Speed ............... 650-750 rpm
Maximum No-Load Speed, rpm ............... 2420-2450
Aspiration Type ............... Naturally Aspirated
Operating Speed ............... 2200 rpm
Compression Ratio ............... 16.0:1
Firing Order ............... 1-2-3
Cylinder Block Type ............... Cast iron, wet sleeve replaceable liners
Cylinder Head Type ............... Cast iron cross-flow single piece
Lubrication System ............... Full-pressure feed
Oil Pump Type ............... Gear-driven trochoid style pump
Oil Filter Type ............... Full-flow, spin-on cartridge
Cooling System ............... Liquid-cooled with bypass thermostat
Water Pump Type ............... Belt-driven, centrifugal impeller
Air Cleaner Type ............... Dry dual-stage heavy duty paper element
Starting System ............... Electric Starter Motor
Electrical System ............... 12 V negative ground
Alternator Output, A ............... 35-55

Fuel System

Injection Pump Model ............... Bosch EP/VA or Bosch VE rotary style
Injection Pump Type ............... Distributor rotary plunger type
Fuel Injection Timing ............... 14 deg BTDC
Injection Pressure, psi (bar) ............... 2900-3045 (200-210)
Injector Nozzle Type ............... Multi-hole pintle style direct orifice
Fuel Transfer Pump Type ............... Camshaft lobe actuated mechanical diaphragm plunger pump
Fuel Filter Type ............... Primary water separator with secondary spin-on element
Fuel Feed Line Diameter, in (mm) ............... 0.315 (8.0)
Fuel Return Line Diameter, in (mm) ............... 0.236 (6.0)
Maximum Fuel Inlet Restriction, in Hg (kPa) ............... 4.0 (13.5)
Maximum Fuel Return Restriction, in Hg (kPa) ............... 10.0 (33.8)
Fuel Tank Vent Pressure, psi (bar) ............... 0.15 (0.01)
Governor Type ............... Mechanical centrifugal flyweight
Injection Timing Advance Range ............... 6.0-8.0 deg
Leak-off Pipe Clearance, in (mm) ............... 0.02-0.04 (0.5-1.0)

Dimensions and Weight

Overall Length, in (mm) ............... 26.8 (680)
Overall Width, in (mm) ............... 22.4 (570)
Overall Height, in (mm) ............... 31.1 (790)
Dry Weight, lbs (kg) ............... 639 (290)
Wet Weight, lbs (kg) ............... 672 (305)

Maintenance Data

Service Information

Compression Pressure, psi (bar) ............... 380-420 (26.2-28.9)
Minimum Oil Pressure at Idle Speed, psi (bar) ............... 14.5 (1.0)
Maximum Oil Pressure at Rated Speed, psi (bar) ............... 58.0 (4.0)
Thermostat Opening Starts, F (C) ............... 174 (79)
Thermostat Fully Open, F (C) ............... 194 (90)
Oil Temperature Nominal Sump, F (C) ............... 194-230 (90-110)
Coolant System Operating Pressure, psi (bar) ............... 7.0 (0.48)
V-Belt Tension Deflection Force, lbs (kg) ............... 9.0 (4.1)
Intake Valve Clearance, in (mm) ............... 0.012 (0.30)
Exhaust Valve Clearance, in (mm) ............... 0.012 (0.30)

Engine Oil and Coolant

Engine Oil Type .................. SAE 30, SAE 10W-30, or 15W-40
API Service Classifications ......................... CC or CD
Engine Oil Capacity with Filter, qt (L) ............... 6.3 (6.0)
Engine Oil Capacity without Filter, qt (L) ............... 5.3 (5.0)
Cooling System Fluid Capacity, qt (L) ............... 10.6 (10.0)

Service Intervals

Change oil and filter ............... Every 150 hours
Inspect air cleaner ............... Every 50 hours
Service air cleaner ............... Every 500 hours
Replace fuel filter ............... Every 250 hours
Valve clearance adjustment ............... Every 500 hours
Fuel system inspection ............... Every 1000 hours
Change coolant ............... Every 1000 hours
Compression test ............... Every 1000 hours
Belt inspection ............... Every service cycle

Service Specifications

Cylinder Liner Inside Bore, in (mm) ............... 3.8750-3.8760 (98.425-98.450)
Cylinder Liner Wear Limit Max, in (mm) ............... 0.0059 (0.150)
Crankshaft Main Journal Diameter, in (mm) ............... 2.9988-2.9996 (76.170-76.190)
Crankshaft Main Bearing Clearance, in (mm) ............... 0.0018-0.0043 (0.046-0.110)
Crankshaft End Play, in (mm) ............... 0.0031-0.0102 (0.080-0.260)
Crankshaft Main Journal Out of Round, in (mm) ............... 0.0004 (0.010)
Crankpin Rod Journal Diameter, in (mm) ............... 2.3736-2.3744 (60.290-60.310)
Con Rod Bearing Clearance, in (mm) ............... 0.0014-0.0037 (0.036-0.095)
Con Rod Big End Bore Diameter, in (mm) ............... 2.5204-2.5212 (64.018-64.038)
Con Rod Small End Bushing Outer Diameter, in (mm) ............... 1.3795-1.3807 (35.040-35.070)
Piston Skirt Outside Diameter, in (mm) ............... 3.8705-3.8717 (98.310-98.340)
Piston to Cylinder Liner Clearance, in (mm) ............... 0.0033-0.0055 (0.085-0.140)
Piston Pin Diameter, in (mm) ............... 1.2598-1.2601 (32.000-32.007)
Piston Pin Bushing Inside Diameter, in (mm) ............... 1.2606-1.2610 (32.020-32.030)
Piston Pin to Bushing Clearance, in (mm) ............... 0.0005-0.0012 (0.013-0.030)
Top Ring Groove Side Clearance, in (mm) ............... 0.0031-0.0047 (0.080-0.120)
Second Ring Groove Side Clearance, in (mm) ............... 0.0024-0.0039 (0.060-0.100)
Oil Ring Groove Side Clearance, in (mm) ............... 0.0016-0.0031 (0.040-0.080)
Top Ring End Gap, in (mm) ............... 0.0118-0.0197 (0.300-0.500)
Second Ring End Gap, in (mm) ............... 0.0098-0.0177 (0.250-0.450)
Oil Ring End Gap, in (mm) ............... 0.0098-0.0157 (0.250-0.400)
Cylinder Head Deck Flatness Tolerance, in (mm) ............... 0.0020 (0.050)
Intake Valve Head Diameter, in (mm) ............... 1.614 (41.00)
Exhaust Valve Head Diameter, in (mm) ............... 1.456 (37.00)
Intake Valve Overall Length, in (mm) ............... 4.881 (124.00)
Exhaust Valve Overall Length, in (mm) ............... 4.893 (124.30)
Valve Guide Inside Diameter, in (mm) ............... 0.3150-0.3159 (8.000-8.022)
Intake Valve Stem Diameter, in (mm) ............... 0.3129-0.3137 (7.948-7.968)
Valve Stem Diameter, in (mm) ............... 0.3117-0.3125 (7.918-7.938)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0013-0.0031 (0.032-0.074)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0024-0.0041 (0.062-0.104)
Intake Valve Head Seat Recess Depth, in (mm) ............... 0.0354-0.0472 (0.900-1.200)
Exhaust Valve Head Seat Recess Depth, in (mm) ............... 0.0354-0.0472 (0.900-1.200)
Intake Valve Face Angle, degrees ............... 45
Exhaust Valve Face Angle, degrees ............... 45
Valve Spring Free Length, in (mm) ............... 1.890 (48.00)
Camshaft Journal Diameter (Number One), in (mm) ............... 1.9961-1.9972 (50.700-50.730)
Camshaft Journal Diameter (Number Two), in (mm) ............... 1.9843-1.9854 (50.400-50.430)
Camshaft Journal Diameter (Number Three), in (mm) ............... 1.9724-1.9736 (50.100-50.130)
Camshaft Bearings Inside Diameter, in (mm) ............... 1.9990-2.0005 (50.775-50.813)
Camshaft End Play, in (mm) ............... 0.0020-0.0059 (0.050-0.150)
Cam Lobe Lift (Intake), in (mm) ............... 0.2835 (7.200)
Cam Lobe Lift (Exhaust), in (mm) ............... 0.2854 (7.250)
Rocker Arm Shaft Outside Bearing Diameter, in (mm) ............... 0.7854-0.7862 (19.950-19.970)
Rocker Arm Bushing Inside Diameter, in (mm) ............... 0.7874-0.7886 (20.000-20.030)
Rocker Arm to Shaft Clearance, in (mm) ............... 0.0012-0.0031 (0.030-0.080)
Tappet Lifter Body Outside Diameter, in (mm) ............... 0.7846-0.7852 (19.930-19.945)
Tappet Guide Bore Inside Diameter Block, in (mm) ............... 0.7874-0.7883 (20.000-20.021)
Tappet to Guide Bore Working Clearance, in (mm) ............... 0.0022-0.0036 (0.055-0.091)
Idler Gear Bushing Inside Diameter, in (mm) ............... 1.4996-1.5008 (38.090-38.120)
Idler Gear Shaft Outside Diameter, in (mm) ............... 1.4976-1.4984 (38.040-38.060)
Idler Gear Backlash Clearance, in (mm) ............... 0.0024-0.0059 (0.060-0.150)

Tightening Torques

Cylinder Head Bolts (Solid Long Style), lb-ft (Nm) ............... 112-117 (152-159)
Cylinder Head Bolts (Hollow Short Style), lb-ft (Nm) ............... 96-100 (130-136)
Main Bearing Cap Retention Bolts, lb-ft (Nm) ............... 83-90 (113-122)
Connecting Rod Cap Marsden Style Nuts, lb-ft (Nm) ............... 46-51 (62-69)
Connecting Rod Cap Esna Style Nuts, lb-ft (Nm) ............... 35-39 (47-53)
Flywheel to Crankshaft Hub Bolts, lb-ft (Nm) ............... 67-72 (91-98)
Flywheel Housing Adaptor Frame Bolts, lb-ft (Nm) ............... 24-27 (33-37)
Camshaft Thrust Retainer Plate Bolts, lb-ft (Nm) ............... 19-22 (26-30)
Crankshaft Front V-Belt Pulley Nut, lb-ft (Nm) ............... 210-230 (285-312)
Timing Gear Case Front Cover Screws, lb-ft (Nm) ............... 15-18 (20-24)
Idler Gear Hub Retainer Stud Nut, lb-ft (Nm) ............... 34-38 (46-52)
Valve Rocker Arm Shaft Bracket Nuts, lb-ft (Nm) ............... 32-35 (43-47)
Rocker Arm Valve Lash Adjuster Jam Nuts, lb-ft (Nm) ............... 18-22 (24-30)
Exhaust Manifold Retention Nuts, lb-ft (Nm) ............... 23-27 (31-37)
Intake Manifold Duct Air Shield Screws, lb-ft (Nm) ............... 18-22 (24-30)
Oil Pump Assembly Retention Core Bolts, lb-ft (Nm) ............... 24-28 (33-38)
Oil Pan Sump Perimeter Drain Plug, lb-ft (Nm) ............... 50-55 (68-75)
Fuel Injection Pump Drive Hub Gear Nut, lb-ft (Nm) ............... 44-50 (60-68)
Fuel Injector Holder Nozzle Clamp Nuts, lb-ft (Nm) ............... 52-58 (70-79)
Fuel Injection High Pressure Line Union Nuts, lb-ft (Nm) ............... 18-22 (24-30)
Water Pump Assembly Body Mount Bolts, lb-ft (Nm) ............... 15-18 (20-24)
Coolant Outlet Manifold Thermostat Housing, lb-ft (Nm) ............... 18-22 (24-30)
Alternator Pivot Adjustment Link Brackets, lb-ft (Nm) ............... 26-30 (35-41)
Starter Motor Flange Mounting Stud Nuts, lb-ft (Nm) ............... 35-41 (47-55)
Oil Pressure Sensor Sending Switch Unit, lb-ft (Nm) ............... 11-14 (15-19)
Coolant Temp Indicator Gauge Sender, lb-ft (Nm) ............... 15-18 (20-24)
Glow Plug Preheater Element Body Ports, lb-ft (Nm) ............... 15-22 (20-30)
Air Cleaner Mounting Bracket Base Bolts, lb-ft (Nm) ............... 24-30 (33-41)
Oil Filter Housing Mounting Adapter Bolts, lb-ft (Nm) ............... 24-28 (33-38)
Fuel Transfer Pump Body Mounting Nuts, lb-ft (Nm) ............... 15-18 (20-24)

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• International Engines Specs
  
• International BD144 Specs
  
• International BD154 Specs
  
• International BD264 Specs
  
• International D166 Specs
  
• International D179 Specs
  
• International D188 Specs
  

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