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Volvo Penta D6-370 Engine

The Volvo Penta D6-370 is an in-line 6-cylinder marine diesel engine engineered for high-performance applications, utilized in both Aquamatic stern drive and inboard shaft installations. Developed on modern diesel architecture, the engine combines a robust cast-iron block and cylinder head with a rigid ladder frame. The design utilizes a large 5.5-liter swept volume integrated with common rail injection and sophisticated electronic engine management to maximize torque across the entire rpm range while keeping exhaust emissions low. Structural reliability is reinforced by a seven-bearing crankshaft, integrated cylinder liners, and a rear-end distribution gear train.

Valve Configuration: Double overhead camshafts (DOHC) driving 4 valves per cylinder (24 valves total). Seats: Replaceable valve seats. Adjustment: Equipped with hydraulic lash adjusters for maintenance-free operation and precise timing. Crankshaft Power: 272 kW (370 hp) at a rated speed of 3500 rpm. Bore: 103 mm. Stroke: 110 mm. Total Displacement: 5.5 liters (336 cubic inches). Compression Ratio: 17.5:1.

Lubrication System Filtration: Separate, easily replaceable full-flow and bypass oil filters. Piston Cooling: Oil-cooled pistons fitted with two compression rings and one oil scraper ring. Oil Cooler: Seawater-cooled tubular oil cooler. Fuel System: High-pressure Common Rail Fuel Injection system. Management: Electronic Vessel Control (EVC) microprocessor system regulating injection timing, pressure, and duration based on real-time operational parameters. Filtration: Fine primary fuel filter combined with an integrated water separator to protect the high-pressure components from contamination.

Cooling System Internal Circuit: Thermostatically regulated freshwater cooling system protecting the block, head, and turbocharger. Heat Exchanger: Tubular type heat exchanger equipped with a separate, high-volume expansion tank. External Circuit: Seawater circuit featuring an easily accessible rubber impeller pump and an inline seawater strainer. Auxiliary Port: Pre-configured coolant system connections for hot water/calorifier outlet integration.

General Technical Data

Engine Specifications

Engine Model ............... Volvo Penta D6-370
Engine Type ............... 4-stroke inline 6-cylinder direct injection liquid-cooled marine diesel
Number of Cylinders ............... 6
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 4.06 (103.0)
Engine Stroke, in (mm) ............... 4.33 (110.0)
Displacement, cu.in (L) ............... 336 (5.5)
Crankshaft Power, hp (kW) ............... 370 (272) at 3500 rpm
Propeller Shaft Power, hp (kW) ............... 363 (267) with HS80AE reverse gear
Rated Engine Speed, rpm ............... 3500
Maximum Torque ............... 877 Nm (647 lb-ft) at 2000 rpm
Low Idle Speed ............... 600-650 rpm
Aspiration Type ............... Turbocharged, supercharged, aftercooled
Compression Ratio ............... 17.5:1
Firing Order ............... 1-5-3-6-2-4
Rotation Direction ............... Clockwise viewed from front
Camshaft Configuration ............... Double overhead camshafts
Valves Per Cylinder ............... 4
Cylinder Block Type ............... Monolithic cast iron
Cylinder Head Type ............... Single piece cast iron 24-valve
Lubrication System ............... Full-pressure circulation with oil cooler
Oil Pump Type ............... Gear-driven displacement pump
Oil Filter Type ............... Two full-flow filters and one bypass filter, spin-on type
Cooling System ............... Liquid-cooled closed freshwater circuit with heat exchanger
Water Pump Type ............... Belt-driven centrifugal freshwater pump and seawater pump
Air Cleaner Type ............... Washable dry replaceable element
Starting System ............... Two-pole electric starter motor
Engine Control System ............... Electronic Vessel Control with EDC7 unit
Emission Certification ............... IMO NOx, EU RCD Stage II, US EPA Tier 3
Electrical System ............... 12V or 24V
Alternator Capacity ............... 115A

Fuel System

Fuel Injection Type ............... Common rail electronic direct injection system
High Pressure Pump ............... Bosch CP3.3 triple piston radial pump
Maximum Rail Pressure, psi (bar) ............... 23205 (1600)
Minimum Starting Rail Pressure, psi (bar) ............... 2900 (200)
Pressure Regulation ............... Magnetic proportional valve control unit on high pressure pump
Fuel Feed Pump Pressure, psi (bar) ............... 72.5-101.5 (5.0-7.0)
Fuel Feed Pump Type ............... Mechanical gear-driven transfer pump
Fuel Injectors ............... Electronically controlled solenoid needle valve type
Fuel Filter Filtration Rating ............... 5 microns primary spin-on canister
Fuel Pre-Filter Separator ............... Water separating primary filter filter bowl setup
Fuel Grade Requirement ............... Ultra low sulfur diesel fuel oil standard specification
Full Load Fuel Consumption, gph (L/h) ............... 19.6 (74.2) at 3500 rpm
Propeller Load Fuel Consumption, gph (L/h) ............... 12.5 (47.5) at 3000 rpm
Cruise Propeller Load Fuel Consumption, gph (L/h) ............... 7.9 (30.0) at 2500 rpm
Low Speed Propeller Load Fuel Consumption, gph (L/h) ............... 4.6 (17.5) at 2000 rpm
Idle Fuel Consumption, gph (L/h) ............... 2.4 (9.0) at 1500 rpm
Specific Fuel Consumption, g/kWh ............... 230 at 3500 rpm
Minimum Specific Fuel Consumption, g/kWh ............... 201 at 2500 rpm

Dimensions and Weight

Overall Length, in (mm) ............... 45.3 (1150)
Overall Length with HS80AE, in (mm) ............... 50.9 (1295)
Overall Width, in (mm) ............... 33.3 (845)
Overall Height, in (mm) ............... 31.1 (790)
Dry Weight (Engine Only), lbs (kg) ............... 1279 (580)
Dry Weight with HS80AE Gearbox, lbs (kg) ............... 1493 (677)
Dry Weight with HS80IVE V-Drive, lbs (kg) ............... 1590 (721)
Dry Weight with DPH Duoprop Drive, lbs (kg) ............... 1698 (770)

Maintenance Data

Service Information

Oil Pressure at Normal Idle, psi (kPa) ............... 18.1 (125)
Oil Pressure at 3500 rpm, psi (kPa) ............... 63.8 (440)
Oil Pressure at Low Idle, psi (kPa) ............... 11.6 (80)
Oil Pressure Relief Valve, psi (kPa) ............... 101.5 (700)
Cooling System Cap Pressure Rating, psi (kPa) ............... 10.9 (75)
Maximum Engine Oil Temperature, F (C) ............... 257 (125)
Thermostat Start To Open Temperature, F (C) ............... 180 (82)
Thermostat Fully Open Temperature, F (C) ............... 198 (92)

Engine Oil and Coolant

Engine Oil Type .................. SAE 5W-30, SAE 10W-30, or SAE 15W-40
API Service Classifications ......................... CH-4 or CI-4
Engine Oil Capacity with Filters, US qt (L) ............... 21.1 (20.0)
Engine Oil Capacity (Low Level), US qt (L) ............... 16.9 (16.0)
Coolant Capacity Closed Circuit, US gal (L) ............... 4.2 (16.0)
Compressor Oil Capacity, US qt (L) ............... 0.11 (0.1)
HS80AE Reverse Gear Oil Capacity, US qt (L) ............... 5.8 (5.5)
HS80IVE V-Drive Oil Capacity, US qt (L) ............... 7.4 (7.0)
DPH Duoprop Drive Oil Capacity, US qt (L) ............... 5.5 (5.2)

Service Intervals

Change oil and filter ............... Every 200 hours
Service air cleaner ............... Every 100 hours
Replace air cleaner ............... Every 400 hours
Replace fuel filter ............... Every 200 hours
Fuel system inspection ............... Every 1200 hours
Change coolant ............... Every 1000 hours
Compression test ............... Every 2000 hours
Replace drive belt ............... Every 400 hours
Replace impeller ............... Every 200 hours
Service heat exchanger ............... Every 400 hours

Service Specifications

Cylinder Bore Inner Diameter, in (mm) ............... 4.0551-4.0559 (103.000-103.020)
Cylinder Bore Maximum Wear Limit, in (mm) ............... 4.0591 (103.100)
Cylinder Bore Ovality Maximum, in (mm) ............... 0.0008 (0.020)
Cylinder Bore Taper Maximum, in (mm) ............... 0.0008 (0.020)
Main Bearing Journal Diameter, in (mm) ............... 3.3461-3.3468 (84.992-85.012)
Main Bearing Clearance, in (mm) ............... 0.0015-0.0035 (0.040-0.090)
Connecting Rod Bearing Journal Diameter, in (mm) ............... 2.5587-2.5594 (64.992-65.010)
Connecting Rod Bearing Clearance, in (mm) ............... 0.0015-0.0033 (0.038-0.084)
Crankshaft Axial End Play, in (mm) ............... 0.0031-0.0118 (0.080-0.300)
Thrust Bearing Journal Width, in (mm) ............... 1.4567-1.4583 (37.000-37.040)
Connecting Rod Total Side Play, in (mm) ............... 0.0059-0.0138 (0.150-0.350)
Piston Skirt Outside Diameter, in (mm) ............... 4.0511-4.0523 (102.900-102.930)
Piston to Cylinder Bore Clearance, in (mm) ............... 0.0027-0.0047 (0.070-0.120)
Piston Pin Diameter, in (mm) ............... 1.5746-1.5748 (39.994-40.000)
Piston Pin to Con Rod Bushing Clearance, in (mm) ............... 0.0006-0.0014 (0.015-0.035)
Top Ring Groove Side Clearance, in (mm) ............... 0.0024-0.0043 (0.060-0.110)
Second Ring Groove Side Clearance, in (mm) ............... 0.0019-0.0037 (0.050-0.095)
Oil Ring Groove Side Clearance, in (mm) ............... 0.0011-0.0029 (0.030-0.075)
Top Ring End Gap, in (mm) ............... 0.0118-0.0197 (0.300-0.500)
Second Ring End Gap, in (mm) ............... 0.0197-0.0295 (0.500-0.750)
Oil Ring End Gap, in (mm) ............... 0.0098-0.0197 (0.250-0.500)
Cylinder Head Flatness Distortion, in (mm) ............... 0.0039 (0.10)
Cylinder Block Deck Flatness, in (mm) ............... 0.0020 (0.05)
Intake Valve Stem Outside Diameter, in (mm) ............... 0.2736-0.2742 (6.950-6.965)
Exhaust Valve Stem Outside Diameter, in (mm) ............... 0.2724-0.2732 (6.920-6.940)
Intake Valve Guide Inside Diameter, in (mm) ............... 0.2756-0.2764 (7.000-7.020)
Exhaust Valve Guide Inside Diameter, in (mm) ............... 0.2756-0.2764 (7.000-7.020)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0014-0.0027 (0.035-0.070)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0024-0.0039 (0.060-0.100)
Intake Valve Head Depth, in (mm) ............... 0.0276-0.0394 (0.700-1.000)
Exhaust Valve Head Depth, in (mm) ............... 0.0276-0.0394 (0.700-1.000)
Valve Seat Angle ............... 45 degrees
Valve Face Angle ............... 44.5 degrees
Camshaft Journal Diameter, in (mm) ............... 1.9681-1.9693 (49.990-50.020)
Camshaft Bearing Clearance, in (mm) ............... 0.0019-0.0039 (0.050-0.100)
Cam Lobe Height (Intake), in (mm) ............... 0.3346 (8.50)
Cam Lobe Height (Exhaust), in (mm) ............... 0.3543 (9.00)
Camshaft Axial End Play, in (mm) ............... 0.0039-0.0098 (0.100-0.250)

Tightening Torques

Cylinder Head Bolts (1-Stage), lb-ft (Nm) ............... 36.9 (50.0)
Cylinder Head Bolts (2-Stage), lb-ft (Nm) ............... 73.8 (100.0)
Cylinder Head Bolts (3-Stage), lb-ft (Nm) ............... 110.6 (150.0)
Main Bearing Cap Bolts (1-Stage), lb-ft (Nm) ............... 44.3 (60.0)
Main Bearing Cap Bolts (2-Stage), lb-ft (Nm) ............... 95.9 (130.0)
Connecting Rod Cap Bolts (1-Stage), lb-ft (Nm) ............... 22.1 (30.0)
Connecting Rod Cap Bolts (2-Stage), lb-ft (Nm) ............... 47.9 (65.0)
Flywheel Fixing Bolts (1-Stage), lb-ft (Nm) ............... 36.9 (50.0)
Flywheel Fixing Bolts (2-Stage), lb-ft (Nm) ............... 73.8 (100.0)
Vibration Damper Crankshaft Pulley Bolts, lb-ft (Nm) ............... 62.7 (85.0)
Camshaft Gear Center Retaining Bolt, lb-ft (Nm) ............... 55.3 (75.0)
Camshaft Bearing Cap, lb-ft (Nm) ............... 17.7 (24.0)
Crankcase Oil Pan Mounting Bolts, lb-ft (Nm) ............... 17.7 (24.0)
Oil Pan Drain Plug, lb-ft (Nm) ............... 33.2 (45.0)
Valve Rocker Arm Shaft Support Bolts, lb-ft (Nm) ............... 22.1 (30.0)
Engine Valve Cover Top Screws, lb-ft (Nm) ............... 8.1 (11.0)
Exhaust Manifold Flange Nuts, lb-ft (Nm) ............... 35.4 (48.0)
Turbocharger Mounting Flange Nut, lb-ft (Nm) ............... 35.4 (48.0)
Common Rail High Pressure Fuel Line Nuts, lb-ft (Nm) ............... 20.7 (28.0)
Fuel Injector Clamping Bracket Fasteners, lb-ft (Nm) ............... 15.5 (21.0)
High Pressure Fuel Pump Drive Gear Bolt, lb-ft (Nm) ............... 66.4 (90.0)
Fuel Injector Feed Pipe Connection Joints, lb-ft (Nm) ............... 19.9 (27.0)
Alternator Bracket Base Pivot Bolts, lb-ft (Nm) ............... 35.4 (48.0)
Starter Motor Frame Mounting Fasteners, lb-ft (Nm) ............... 35.4 (48.0)
Seawater Pump Housing Screws, lb-ft (Nm) ............... 15.5 (21.0)
Oil Cooler Housing Core Clamping Screws, lb-ft (Nm) ............... 17.7 (24.0)
Freshwater Thermostat Housing Cover Bolts, lb-ft (Nm) ............... 17.7 (24.0)
Flywheel Housing to Engine Block (M12), lb-ft (Nm) ............... 62.7 (85.0)
Flywheel Housing to Engine Block (M10), lb-ft (Nm) ............... 35.4 (48.0)
Crankcase Breather Element Cover Screws, lb-ft (Nm) ............... 8.1 (11.0)
Supercharger Compressor Sump Drain Plug, lb-ft (Nm) ............... 14.8 (20.0)
Supercharger Assembly Main Bracket Bolts, lb-ft (Nm) ............... 35.4 (48.0)
Intake Manifold Air Inlet Plenum Bolts, lb-ft (Nm) ............... 17.7 (24.0)
Glow Plug Cylindrical Heating Elements, lb-ft (Nm) ............... 11.1 (15.0)
Oil Pump Internal Delivery Pipe Flange, lb-ft (Nm) ............... 8.1 (11.0)
Piston Oil Cooling Jet Nozzle Bolt, lb-ft (Nm) ............... 11.1 (15.0)
Timing Gear Case Backplate M8 Bolts, lb-ft (Nm) ............... 17.7 (24.0)
Timing Gear Case Outer Cover M6 Screws, lb-ft (Nm) ............... 7.4 (10.0)
Engine Oil Filter Bypass Valve Assembly, lb-ft (Nm) ............... 25.8 (35.0)
Coolant Heat Exchanger Drain Cock Valve, lb-ft (Nm) ............... 18.4 (25.0)
Raw Water Sacrificial Anode Brass Plug, lb-ft (Nm) ............... 22.1 (30.0)
Engine Support Foot Marine Mount Bolts, lb-ft (Nm) ............... 103.3 (140.0)
Exhaust Riser Discharge Elbow Band Clamp, lb-ft (Nm) ............... 8.9 (12.0)
Engine Control Unit Heat Sink Bolts, lb-ft (Nm) ............... 6.6 (9.0)
Rail Pressure Sensor Threaded Interface, lb-ft (Nm) ............... 51.6 (70.0)
Fuel Temperature Sensor Brass Housing, lb-ft (Nm) ............... 14.8 (20.0)
Coolant Temperature Sensor Element, lb-ft (Nm) ............... 16.2 (22.0)
Manifold Boost Air Pressure Sensor Bolt, lb-ft (Nm) ............... 6.6 (9.0)
Lube Oil Pressure Sensor, lb-ft (Nm) ............... 22.1 (30.0)
Crankshaft Position Sensor Pickup Bracket, lb-ft (Nm) ............... 7.4 (10.0)
Camshaft Position Reference Indicator Bolt, lb-ft (Nm) ............... 7.4 (10.0)
Water In Fuel Contamination Bottom Sensor, lb-ft (Nm) ............... 2.2 (3.0)
Sea Water Circuit Impeller End Cover Screws, lb-ft (Nm) ............... 4.4 (6.0)
Air Intake Silencer Filter Housing Clamps, lb-ft (Nm) ............... 5.2 (7.0)
Compressor Drive Electromagnetic Clutch Bolt, lb-ft (Nm) ............... 44.3 (60.0)

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• Volvo Penta Engines Specs
  
• Volvo Penta D6-310 Specs
  
• Volvo Penta D6-350 Specs
  
• Volvo Penta D6-380 Specs
  
• Volvo Penta D6-400 Specs
  
• Volvo Penta D6-440 Specs
  
• Volvo Penta D6-480 Specs
  

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