________________________________________________________________________________

Continental TMD20 Engine

General Technical Data

Engine Specifications

Engine Model ............... Continental TMD20
Engine Type ............... 4-cycle inline 3-cylinder overhead valve liquid-cooled industrial diesel
Number of Cylinders ............... 3
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 3.58 (91.0)
Engine Stroke, in (mm) ............... 4.06 (103.2)
Displacement, cu.in (L) ............... 123 (2.0)
Rated Engine Power, hp (kW) ............... 40-52 (30-39)
Rated Engine Speed, rpm ............... 2200-2500
Peak Torque ............... 105-115 Nm (77-85 lb-ft) at 1400-1600 rpm
Idle Speed ............... 650-750 rpm
Aspiration Type ............... Naturally Aspirated
Operating Speed ............... 2200 rpm
Compression Ratio ............... 21.5:1-22.5:1
Firing Order ............... 1-2-3
Combustion Chamber ............... Indirect injection swirl combustion pre-chamber system
Crankcase Ventilation ............... Closed circuit positive filtration returning to intake manifold
Cylinder Block Type ............... Cast iron with replaceable wet liners
Cylinder Head Type ............... Cast iron overhead valve single piece
Lubrication System ............... Full-pressure internal gallery feed
Oil Pump Type ............... Crankshaft-driven gerotor type high capacity pump
Oil Filter Type ............... Full-flow spin-on cartridge
Cooling System ............... Liquid-cooled with bypass thermostat regulation
Water Pump Type ............... Belt-driven centrifugal impeller pump
Air Cleaner Type ............... Dry heavy-duty dual-element with restriction indicator
Starting System ............... Electric Starter with integrated solenoid
Electrical System ............... 12V negative ground alternating current system
Alternator Output ............... 37-55A

Fuel System

Injection Pump Model ............... Stanadyne or Delphi rotary distribution pump
Injection Pump Drive Variant ............... Bolted 34-tooth spur gear mounted on camshaft
Fuel Injection Timing ............... 14-18 degrees BTDC
Injection Pressure, psi (bar) ............... 1850-2100 (127-145)
Injector Nozzle Type ............... Pintle type self-cleaning nozzle variant
Fuel Transfer Pump Variant ............... Mechanical diaphragm lift pump or electric auxiliary unit
Fuel Filter Primary Type ............... Water separator sedimenter spin-on assembly cartridge unit
Fuel Filter Secondary Type ............... Fine micron paper element high-efficiency spin-on filter unit
Maximum Fuel Return Flow, gph (L/h) ............... 4.5 (17.0)
Maximum Fuel Inlet Restriction, inHg (kPa) ............... 4.0 (13.5)
Fuel Tank Venting Requirements ............... Open atmosphere screened breather config cap assembly
Injection Lines Inner Diameter, in (mm) ............... 0.078 (2.0)
Injection Lines Outer Diameter, in (mm) ............... 0.250 (6.35)
Governor Regulation ............... Mechanical centrifugal flyweight governor internal assembly
Governor Control Linkage Type ............... Spring-loaded positive mechanical linkage rod assembly
Cold Start Preheater Type ............... Individual cylinder glow plugs standard equipment system
Glow Plug Current Draw, A ............... 10-12 per individual preheater heating element unit
Fuel Grade Recommendation ............... Ultra-low sulfur diesel number 2-D specification standard

Dimensions and Weight

Overall Length, in (mm) ............... 24.8 (630)
Overall Width, in (mm) ............... 19.3 (490)
Overall Height, in (mm) ............... 27.6 (700)
Dry Weight, lbs (kg) ............... 410 (186)
Wet Weight, lbs (kg) ............... 435 (197)

Maintenance Data

Service Information

Compression Pressure (Minimum), psi (bar) ............... 380 (26.2)
Minimum Oil Pressure at Idle, psi (kPa) ............... 15 (103.4)
Normal Oil Pressure at Rated Speed, psi (kPa) ............... 40-60 (275.8-413.7)
Thermostat Opening Temperature, F (C) ............... 180 (82)
Thermostat Full Open Temperature, F (C) ............... 202 (94.4)
Maximum Allowable Oil Temperature, F (C) ............... 230 (110)
Maximum Allowable Coolant Temperature, F (C) ............... 212 (100)
Cooling System Cap Pressure, psi (kPa) ............... 7.0-9.0 (48.3-62.1)
V-Belt Tension Deflection, in (mm) ............... 0.5 (12.7)
Intake Valve Clearance (Cold), in (mm) ............... 0.012 (0.30)
Exhaust Valve Clearance (Cold), in (mm) ............... 0.014 (0.35)

Engine Oil and Coolant

Engine Oil Type .................. SAE 30, SAE 10W-30, 15W-40
API Service Classifications ......................... CD or CE
Engine Oil Capacity with Filter, qt (L) ............... 6.0 (5.7)
Engine Oil Capacity without Filter, qt (L) ............... 5.3 (5.0)
Cooling System Fluid Capacity, qt (L) ............... 7.5 (7.1)

Service Intervals

Change engine oil ............... Every 100 hours
Replace oil filter ............... Every 100 hours
Replace fuel filters ............... Every 250 hours
Inspect air filter ............... Every 50 hours
Replace air filter ............... Every 500 hours
Change coolant ............... Every 1000 hours
Valve-lash adjustment ............... Every 500 hours
Check fuel system ............... Every 1000 hours
Compression test ............... Every 1000 hours
Belt inspection ............... Every 100 hours

Service Specifications

Cylinder Liner Bore Inside Diameter, in (mm) ............... 3.5825-3.5835 (90.996-91.021)
Cylinder Liner Max Out of Round, in (mm) ............... 0.0010 (0.025)
Cylinder Liner Max Taper, in (mm) ............... 0.0015 (0.038)
Crankshaft Main Journal Diameter, in (mm) ............... 2.8718-2.8730 (72.944-72.974)
Main Bearing Journal Clearance, in (mm) ............... 0.0020-0.0038 (0.051-0.097)
Crankshaft Crankpin Journal Diameter, in (mm) ............... 1.9365-1.9375 (49.187-49.213)
Connecting Rod Bearing Clearance Standard, in (mm) ............... 0.0015-0.0032 (0.038-0.081)
Crankshaft End Play, in (mm) ............... 0.004-0.008 (0.102-0.203)
Connecting Rod Side Clearance, in (mm) ............... 0.005-0.011 (0.127-0.279)
Connecting Rod Small End Bushing I.D, in (mm) ............... 1.1822-1.1828 (30.028-30.043)
Piston to Cylinder Bore Clearance, in (mm) ............... 0.0035-0.0045 (0.089-0.114)
Piston Pin Bore Inside Diameter, in (mm) ............... 1.1813-1.1816 (30.005-30.013)
Piston Pin Outer Diameter, in (mm) ............... 1.1810-1.1812 (29.997-30.002)
Piston Pin to Piston Pin Bore Clearance, in (mm) ............... 0.0001-0.0004 (0.003-0.010)
Piston Pin to Con Rod Bushing Clearance, in (mm) ............... 0.0008-0.0015 (0.020-0.038)
Top Piston Ring Groove Width, in (mm) ............... 0.0995-0.1005 (2.527-2.553)
Second Piston Ring Groove Width, in (mm) ............... 0.0798-0.0808 (2.027-2.052)
Oil Piston Ring Groove Width, in (mm) ............... 0.1585-0.1595 (4.026-4.051)
Top Ring Side Clearance, in (mm) ............... 0.0020-0.0035 (0.051-0.089)
Second Ring Side Clearance, in (mm) ............... 0.0015-0.0030 (0.038-0.076)
Oil Ring Side Clearance, in (mm) ............... 0.0015-0.0030 (0.038-0.076)
Top Ring End Gap, in (mm) ............... 0.010-0.018 (0.254-0.457)
Second Ring End Gap, in (mm) ............... 0.008-0.016 (0.203-0.406)
Oil Ring End Gap, in (mm) ............... 0.010-0.020 (0.254-0.508)
Cylinder Head Deck Face Flatness, in (mm) ............... 0.003 (0.076)
Valve Guide Inside Diameter, in (mm) ............... 0.3145-0.3155 (7.988-8.014)
Intake Valve Stem Outer Diameter, in (mm) ............... 0.3125-0.3132 (7.938-7.955)
Exhaust Valve Stem Outer Diameter, in (mm) ............... 0.3115-0.3122 (7.912-7.930)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0013-0.0030 (0.033-0.076)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0023-0.0040 (0.058-0.102)
Intake Valve Face Angle, degrees ............... 45
Exhaust Valve Face Angle, degrees ............... 45
Intake Valve Seat Angle, degrees ............... 45
Exhaust Valve Seat Angle, degrees ............... 45
Intake Valve Head Margin Thickness, in (mm) ............... 0.045 (1.14)
Exhaust Valve Head Margin Thicknesst, in (mm) ............... 0.040 (1.02)
Valve Spring Free Length, in (mm) ............... 1.885 (47.88)
Camshaft Journal Diameter (Front), in (mm) ............... 1.9965-1.9975 (50.711-50.737)
Camshaft Journal Diameter (Center), in (mm) ............... 1.9652-1.9662 (49.916-49.941)
Camshaft Journal Diameter (Rear), in (mm) ............... 1.8715-1.8725 (47.536-47.562)
Camshaft Journal Oil Clearance, in (mm) ............... 0.0015-0.0035 (0.038-0.089)
Camshaft End Play, in (mm) ............... 0.003-0.007 (0.076-0.178)
Cam Lobe Lift (Intake), in (mm) ............... 0.285 (7.24)
Cam Lobe Lift (Exhaust), in (mm) ............... 0.292 (7.42)
Valve Lifter Body Outer Diameter, in (mm) ............... 0.7482-0.7490 (19.004-19.025)
Valve Lifter Block Guide Bore Diameter, in (mm) ............... 0.7500-0.7510 (19.050-19.075)
Valve Lifter to Block Guide Bore Clearance, in (mm) ............... 0.0010-0.0028 (0.025-0.071)
Rocker Arm Shaft Outer Diameter, in (mm) ............... 0.7852-0.7862 (19.944-19.969)
Rocker Arm Bushing Inner Diameter, in (mm) ............... 0.7872-0.7882 (19.995-20.020)
Rocker Arm Bushing to Shaft Clearance, in (mm) ............... 0.0010-0.0030 (0.025-0.076)

Tightening Torques

Cylinder Head Bolts (Stage 1) ............... 35 lb-ft (47 Nm)
Cylinder Head Bolts (Stage 2) ............... 65 lb-ft (88 Nm)
Cylinder Head Bolts (Stage 3) ............... 95 lb-ft (129 Nm)
Main Bearing Cap Fasteners ............... 85 lb-ft (115 Nm)
Connecting Rod Cap Bolts ............... 48 lb-ft (65 Nm)
Flywheel Retaining Bolts ............... 60 lb-ft (81 Nm)
Crankshaft Front Pulley Dampener Bolt ............... 110 lb-ft (149 Nm)
Camshaft Thrust Plate Fasteners ............... 18 lb-ft (24 Nm)
Camshaft Drive Gear Flange Nut ............... 55 lb-ft (75 Nm)
Rocker Arm Shaft Bracket Support Nuts ............... 25 lb-ft (34 Nm)
Valve Cover Retaining Acorn Nuts ............... 8 lb-ft (11 Nm)
Intake Manifold Flange Fasteners ............... 22 lb-ft (30 Nm)
Exhaust Manifold Flange Fasteners ............... 25 lb-ft (34 Nm)
Oil Pan Sump Attachment Screws ............... 12 lb-ft (16 Nm)
Oil Pan Bottom Sump Drain Plug ............... 35 lb-ft (47 Nm)
Oil Pump Internal Pickup Tube Brackets ............... 15 lb-ft (20 Nm)
Oil Pump Cover Plate Screws Casing ............... 9 lb-ft (12 Nm)
Injection Pump Drive Gear Center Nut ............... 45 lb-ft (61 Nm)
Fuel Injection Pump Housing Mounting Nuts ............... 20 lb-ft (27 Nm)
Fuel Injector Assembly Clamping Nuts ............... 18 lb-ft (24 Nm)
Fuel Injection High Pressure Pipe Union Nuts ............... 22 lb-ft (30 Nm)
Glow Plug Hex Body Screws ............... 15 lb-ft (20 Nm)
Water Pump Assembly Housing Bolts ............... 18 lb-ft (24 Nm)
Thermostat Housing Cover Outlet Bolts ............... 15 lb-ft (20 Nm)
Engine Front Timing Gear Cover Screws ............... 14 lb-ft (19 Nm)
Rear Crankshaft Oil Seal Housing Screws ............... 12 lb-ft (16 Nm)
Flywheel Housing to Cylinder Block Fasteners ............... 40 lb-ft (54 Nm)
Starter Motor Structural Flange Mounting Bolts ............... 45 lb-ft (61 Nm)
Alternator Pivot Adjustment Link Arm Bolt ............... 22 lb-ft (30 Nm)
Oil Pressure Sensor Sending Unit ............... 12 lb-ft (16 Nm)
Coolant Temperature Sensor ............... 16 lb-ft (22 Nm)

________________________________________________________________________________________

• Continental Engines Specs
  
• Continental TMD27 Specs
  
• Continental TME27 Specs
  
• Continental Y112 Specs
  
• Continental Y69 Specs
  
• Continental Y91 Specs
  

________________________________________________________________________________

________________________________________________________________________________________

_______________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________

________________________________________________________________________________________