Volvo Penta D3-170I Mid-Range Inboard Marine Diesel Engine

Description

Early morning harbor departures demand clean exhaust and steady low-speed maneuverability. The Volvo Penta D3-170I Inboard Engine meets these coastal harbor requirements with a 2.4L 5-Cylinder architecture rated at 170BHP at 4,000 RPM and 120BHP continuous at 3,000 RPM. Common-rail fuel management requires strict 2-micron pre-filtration, while the aluminum block requires careful coolant corrosion monitoring.

High-pressure die-cast aluminum forms the cylinder block with cast-in high-strength iron liners to counter piston thrust. Dual overhead camshafts drive 20 valves inside the crossflow aluminum cylinder head. The marine electrical plant features an isolated 12V 2-pole system equipped with a 3.0 kW starter and a 12V 150A alternator. The compact engine stance spans 34.2in long, 27.1in wide, and 27.4in high. Total dry weight measures 573 lbs without transmission. Sump capacity holds 1.72 US gal.

Key Features of Volvo Penta D3-170I

Commercial boatbuilders buy Volvo Penta D3-170I mid-range marine engines for precision shaftline repower installations in mid-range motor cruisers. Fleet engineers select this common-rail powertrain for commercial workboat diesel engine repower hulls requiring quiet harbor performance.

• Piezoelectric injectors fire diesel fuel charges at 1,800 bar rail pressure
• Variable geometry turbocharging generates boost across low shaft speeds up to 4,000 RPM
• Freshwater cooling passages protect the crossflow aluminum head from corrosive salt deposits
• Electronic Vessel Control transmits shift signals across secure CAN-bus wiring runs
• Ductile cast-in iron liners absorb heavy side-loads from rapid throttle acceleration cycles
• Inboard pattern flywheel housings connect to ZF 45A or Volvo Penta HS45A gearboxes
• Multi-groove serpentine belt systems maintain constant drive tension on the 12V 150A alternator

Dynamometer Load Bench Test Results

Dynamometer tests verify 120BHP continuous output at 3,000 RPM and 170BHP peak shaft power at 4,000 RPM. Turbo boost pressure holds steady at 1.45 bar under maximum rated output. Freshwater heat exchanger circuits stabilize engine coolant temperature at 182°F during sustained high-load trials. Lube oil pressure maintains 50 PSI across peak operating revolutions. Maximum static hull installation angle reaches 30° for steep shaft angles. Crankshaft journal runout remains under 0.0005in TIR to prevent premature main bearing wear during high-speed operation. Exhaust gas pyrometer values remain below 1,250°F during full load cycles.

Field Operation Maintenance Service Rules

CAN-bus electronic helm controls transmit throttle changes with under 2 lbs of lever force. Do not install this high-speed aluminum diesel engine in heavy commercial displacement tugs or unballasted work barges requiring massive cast-iron weight. It requires clean marine gas oil and will fail if fed water-contaminated fuel supplies.

• Drain crankcase lube oil and change filter elements every 200 service hours
• Inspect raw water pump impellers and heat exchanger zinc anodes every 150 hours
• Replace primary 2-micron fuel water separator filter elements every 250 engine hours

Factory Warranty Shipment Parts List

Volvo Penta backs this engine with a 2-Year limited warranty and 3-Year major component casting coverage. The wooden crate contains the bobtail diesel engine assembly, 12V 150A alternator, 3.0 kW starter, four flexible vibration mounts, EVC wiring harness, oil pressure senders, and factory technical documentation.