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Volvo Penta D7A-T Engine

General Technical Data

Engine Specifications

Engine Model ............... Volvo Penta D7A-T
Engine Type ............... 4-cycle inline 6-cylinder direct injection liquid-cooled diesel
Number of Cylinders ............... 6
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 4.25 (108.0)
Engine Stroke, in (mm) ............... 5.12 (130.0)
Displacement, cu.in (L) ............... 436.3 (7.15)
Rated Engine Power, hp (kW) ............... 175 (129)
Rated Engine Speed, rpm ............... 1500-2300
Peak Torque ............... 507-596 lb-ft (688-809 Nm) at 1500 rpm
Idle Speed ............... 650-750 rpm
Aspiration Type ............... Turbocharged
Operating Speed ............... 1500-2300 rpm
Compression Ratio ............... 17.5:1
Firing Order ............... 1-5-3-6-2-4
Combustion System ............... Direct injection
Crankshaft Rotation ............... Counter-clockwise from flywheel side
Valve Configuration ............... Overhead valves (OHV)
Valves Per Cylinder ............... 2
Turbocharger Manufacturer ............... Schwitzer S2B
Crankcase Ventilation ............... Closed loop system
Cylinder Block Type ............... Cast iron
Cylinder Head Type ............... Cast iron
Lubrication System ............... Full-pressure
Oil Pump Type ............... Rotor-type gear-driven
Oil Filter Type ............... Full-flow, spin-on
Cooling System ............... Liquid-cooled
Water Pump Type ............... Belt-driven, centrifugal
Air Cleaner Type ............... Dry dual-stage
Emission Certification ............... IMO NOx, EU IWW, CCNR2
Starting System ............... Electric Starter
Electrical System ............... 12V or 24V
Alternator Capacity ............... 55A

Fuel System

Fuel Injection Pump Type ............... Bosch PF 33 L unit pumps
Number of Injection Pumps ............... 6
Fuel Injector Nozzle Type ............... Six-hole design
Injector Opening Pressure, psi (MPa) ............... 3988 (27.5)
Fuel Lift Pump Type ............... Mechanical plunger
Fuel Feed Pump Pressure, psi (kPa) ............... 29-43 (200-300)
Governor Type ............... Mechanical or electronic
Fuel Filter Element Type ............... Spin-on cartridge dual setup
Recommended Fuel Standard ............... ASTM-D975 1-D/2-D, EN 590, JIS KK 2204
Maximum Fuel Temperature, F (C) ............... 104 (40)
Specific Fuel Consumption, g/kWh (lb/hph) ............... 213 (0.345) at 1900 rpm
Maximum Allowed Fuel Return Flow, gal/h (L/h) ............... 7.9 (30.0)
Fuel Suction Restriction Maximum, in Hg (kPa) ............... 5.9 (20.0)
Fuel Return Line Restriction Maximum, in Hg (kPa) ............... 11.8 (40.0)
Injection Timing Angle ............... 11 degrees BTDC
Governor Regulation Droop ............... 3% to 5%
Fuel System Venting Tool ............... Manual priming pump
Water Separator Filter Type ............... Spin-on with water sensor
Injection Pipe Outer Diameter, in (mm) ............... 0.23 (6.0)
Injection Pipe Wall Thickness, in (mm) ............... 0.07 (2.0)
High Pressure Fuel Line Joint Style ............... Flared cone nut
Maximum Leakage Flow Rate, qt/h (L/h) ............... 0.52 (0.50)
Fuel Stop Solenoid Type ............... 24V energized to run/stop
Smoke Limiter Diaphragm Type ............... Aneroid control valve
Fuel Heater Capacity, W ............... 150 to 300

Dimensions and Weight

Overall Engine Length, in (mm) ............... 49.3 (1250)
Genset Config Length, in (mm) ............... 84.8 (2155)
Overall Engine Width, in (mm) ............... 30.6 (780)
Genset Config Width, in (mm) ............... 45.5 (1155)
Overall Engine Height, in (mm) ............... 40.2 (1020)
Genset Config Height, in (mm) ............... 50.2 (1275)
Dry Weight, Bobtail, lbs (kg) ............... 1521 (690)
Wet Weight, Bobtail, lbs (kg) ............... 1598 (725)
Dry Weight with Generator UCM274E, lbs (kg) ............... 3230 (1465)
Dry Weight with Generator UCM274F, lbs (kg) ............... 3395 (1540)

Maintenance Data

Service Information

Oil Pressure at Operating Speed, psi (kPa) ............... 43-72 (300-500)
Oil Pressure at Low Idle, min psi (kPa) ............... 14.5 (100)
Coolant Cap Pressure Cap Rating, psi (kPa) ............... 10.1 (70)
Coolant Temperature Normal Operating, F (C) ............... 176-194 (80-90)
Thermostat Opening Temperature, F (C) ............... 181 (83)
Thermostat Fully Open Temperature, F (C) ............... 203 (95)
Inlet Valve Clearance, Cold, in (mm) ............... 0.014 (0.35)
Exhaust Valve Clearance, Cold, in (mm) ............... 0.020 (0.50)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-30, SAE 15W-40, VDS-2, or VDS-3
API Service Classifications ......................... CH-4 or CI-4
Engine Oil Capacity with Filters, qt (L) ............... 22.7 (21.5)
Engine Oil Capacity without Filters, qt (L) ............... 20.6 (19.5)
Minimum Lubrication Oil Capacity, qt (L) ............... 16.9 (16.0)
Coolant Capacity (Engine Block), gal (L) ............... 3.4 (13.0)
Coolant Capacity (Heat Exchanger), gal (L) ............... 6.3 (24.0)

Service Intervals

Change engine oil ............... Every 500 hours
Replace oil filter ............... Every 500 hours
Replace fuel filter ............... Every 500 hours
Service air filter ............... Every 250 hours
Replace air filter ............... Every 1000 hours
Change coolant ............... Every 2000 hours
Valve-lash adjustment ............... Every 1000 hours
Check fuel system ............... Every 1500 hours
Compression test ............... Every 1500 hours
Belt inspection ............... Every 200 hours

Service Specifications

Cylinder Liner Bore Inside Diameter, in (mm) ............... 4.2519-4.2527 (108.000-108.022)
Cylinder Liner Wear Limit Max, in (mm) ............... 4.2559 (108.100)
Cylinder Liner Taper Maximum, in (mm) ............... 0.0015 (0.040)
Crankshaft Main Journal Diameter, in (mm) ............... 3.3460-3.3468 (84.990-85.010)
Crankshaft Main Bearing Clearance, in (mm) ............... 0.0019-0.0039 (0.050-0.100)
Crankpin Journal Diameter, in (mm) ............... 2.5980-2.5988 (65.990-66.010)
Connecting Rod Bearing Clearance, in (mm) ............... 0.0015-0.0035 (0.040-0.090)
Connecting Rod Small End Bore I.D, in (mm) ............... 2.7559-2.7567 (70.000-70.020)
Crankshaft Axial End Play, in (mm) ............... 0.0039-0.0118 (0.100-0.300)
Piston Skirt Outer Diameter, in (mm) ............... 4.2464-4.2472 (107.860-107.880)
Piston to Cylinder Bore Clearance, in (mm) ............... 0.0047-0.0063 (0.120-0.160)
Piston Pin Outer Diameter, in (mm) ............... 1.5746-1.5748 (39.994-40.000)
Piston Pin Bushing Inner Diameter, in (mm) ............... 1.5759-1.5763 (40.028-40.040)
Top Ring Groove Clearance, in (mm) ............... 0.0035-0.0047 (0.090-0.120)
Second Ring Groove Clearance, in (mm) ............... 0.0023-0.0039 (0.060-0.100)
Oil Control Ring Groove Clearance, in (mm) ............... 0.0015-0.0031 (0.040-0.080)
Top Ring End Gap, in (mm) ............... 0.0118-0.0196 (0.300-0.500)
Second Ring End Gap, in (mm) ............... 0.0157-0.0236 (0.400-0.600)
Oil Ring End Gap, in (mm) ............... 0.0098-0.0177 (0.250-0.450)
Cylinder Head Distortion Surface Max, in (mm) ............... 0.0020 (0.050)
Inlet Valve Stem Outer Diameter, in (mm) ............... 0.3523-0.3531 (8.950-8.970)
Exhaust Valve Stem Outer Diameter, in (mm) ............... 0.3511-0.3519 (8.920-8.940)
Valve Guide Inner Diameter, in (mm) ............... 0.3543-0.3551 (9.000-9.022)
Inlet Valve Stem to Guide Clearance, in (mm) ............... 0.0011-0.0028 (0.030-0.072)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0023-0.0040 (0.060-0.102)
Valve Guide Protrusion Above Head, in (mm) ............... 0.590-0.610 (15.00-15.50)
Inlet Valve Seat Angle, deg ............... 30
Exhaust Valve Seat Angle, deg ............... 45
Inlet Valve Face Angle, deg ............... 29.5
Exhaust Valve Face Angle, deg ............... 44.5
Inlet Valve Sink Depth, in (mm) ............... 0.035-0.047 (0.90-1.20)
Exhaust Valve Sink Depth, in (mm) ............... 0.035-0.047 (0.90-1.20)
Valve Spring Free Length, in (mm) ............... 2.165 (55.00)
Camshaft Journal Diameter, in (mm) ............... 1.9665-1.9673 (49.950-49.970)
Camshaft Bearing Clearance, in (mm) ............... 0.0019-0.0035 (0.050-0.090)
Camshaft End Play, in (mm) ............... 0.0039-0.0118 (0.100-0.300)
Cam Lobe Lift (Inlet), in (mm) ............... 0.2755 (7.000)
Cam Lobe Lift (Exhaust), in (mm) ............... 0.2913 (7.400)
Rocker Arm Shaft Outer Diameter, in (mm) ............... 0.8651-0.8657 (21.973-21.990)
Rocker Arm Bushing Inner Diameter, in (mm) ............... 0.8661-0.8673 (22.000-22.030)

Tightening Torques

Cylinder Head Bolts (Step 1) ............... 22 lb-ft (30 Nm)
Cylinder Head Bolts (Step 2) ............... 59 lb-ft (80 Nm)
Cylinder Head Bolts (Step 3) ............... 90+90 degrees angle
Main Bearing Cap Bolts (Step 1) ............... 37 lb-ft (50 Nm)
Main Bearing Cap Bolts (Step 2) ............... 111 lb-ft (150 Nm)
Main Bearing Cap Bolts (Step 3) ............... 90 degrees angle
Connecting Rod Cap Bolts (Step 1) ............... 22 lb-ft (30 Nm)
Connecting Rod Cap Bolts (Step 2) ............... 59 lb-ft (80 Nm)
Connecting Rod Cap Bolts (Step 3) ............... 60 degrees angle
Flywheel Retaining Bolts ............... 44 lb-ft (60 Nm)
Flywheel Housing M10 Bolts ............... 37 lb-ft (50 Nm)
Flywheel Housing M12 Bolts ............... 59 lb-ft (80 Nm)
Crankshaft Vibration Damper Bolt ............... 74 lb-ft (100 Nm)
Camshaft Gear Retaining Bolt ............... 63 lb-ft (85 Nm)
Camshaft Thrust Plate Fasteners ............... 18 lb-ft (25 Nm)
Rocker Arm Shaft Support Fasteners ............... 30 lb-ft (40 Nm)
Valve Adjusting Screw Locknut ............... 18 lb-ft (25 Nm)
Cylinder Head Cover Fasteners ............... 7.4 lb-ft (10 Nm)
Oil Pan Drain Plug ............... 44 lb-ft (60 Nm)
Oil Pan Perimeter Mounting Bolts ............... 18 lb-ft (25 Nm)
Oil Pump Assembly Fasteners ............... 18 lb-ft (25 Nm)
Oil Cooler Element Housing Bolts ............... 18 lb-ft (25 Nm)
Fuel Injection Pump Clamp Bolts ............... 22 lb-ft (30 Nm)
Fuel Injector Clamping Bracket Nut ............... 26 lb-ft (35 Nm)
High Pressure Fuel Line Flare Nut ............... 22 lb-ft (30 Nm)
Fuel Delivery Gallery Pipe Union Bolt ............... 18 lb-ft (25 Nm)
Turbocharger Flange Nuts ............... 33 lb-ft (45 Nm)
Turbocharger Compressor Air V-Clamp ............... 7.4 lb-ft (10 Nm)
Exhaust Manifold Securing Bolts ............... 33 lb-ft (45 Nm)
Intake Manifold Air Duct Fasteners ............... 18 lb-ft (25 Nm)
Water Pump Assembly Bolts ............... 18 lb-ft (25 Nm)
Coolant Thermostat Housing Bolts ............... 18 lb-ft (25 Nm)
Alternator Mounting Support Pivot Bolt ............... 37 lb-ft (50 Nm)
Alternator Tension Link Bolt Nut ............... 18 lb-ft (25 Nm)
Starter Motor Mounting Flange Nuts ............... 37 lb-ft (50 Nm)
Front Engine Mount Adapter Fasteners ............... 59 lb-ft (80 Nm)
Rear Engine Mount Adapter Fasteners ............... 59 lb-ft (80 Nm)
Oil Pressure Sensorl ............... 15 lb-ft (20 Nm)
Coolant Temperature Sensort ............... 22 lb-ft (30 Nm)
Timing Gear Case Cover Fasteners ............... 18 lb-ft (25 Nm)
Idler Gear Hub Assembly Bolt ............... 52 lb-ft (70 Nm)
Piston Cooling Oil Jet Valve Bolt ............... 26 lb-ft (35 Nm)
Air Compressor Mounting Drive Gear Nut ............... 88 lb-ft (120 Nm)
Raw Water Pump Mounting Flange Bolts ............... 18 lb-ft (25 Nm)
Fuel Lift Pump Body Securing Studs ............... 18 lb-ft (25 Nm)
Oil Pressure Relief Valve Cap ............... 37 lb-ft (50 Nm)
Full Flow Oil Filter Head Housing Bolts ............... 18 lb-ft (25 Nm)
Flywheel Housing Cover Screw ............... 7.4 lb-ft (10 Nm)
Crankcase Breather Cover Bolts ............... 7.4 lb-ft (10 Nm)
Vibration Damper Ring Pulley Bolts ............... 22 lb-ft (30 Nm)
Governor Housing Cover Capscrews ............... 7.4 lb-ft (10 Nm)

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