Volvo Penta D1-30 Bobtail Inboard Marine Diesel Engine

Description

Supplying dependable auxiliary thrust and ample electrical charging on offshore passages is the primary function of the Volvo Penta D1-30 Bobtail Marine Engine. This 3-Cylinder 1.1L diesel outputs 26.0BHP continuous power at 3,000 RPM for cruising sailboats. Operators must inspect the raw water impeller on strict seasonal schedules and check heat exchanger tube bundles for salt scale accumulation.

Structural casting uses an ASTM gray cast iron monobloc block featuring parent cylinder bores and an overhead-valve cylinder head. Electrical architecture provides a 12V negative ground system with a 1.1 kW electric starter and a 115A marine alternator with sensor wire regulation. Dry weight totals 287 lbs without transmission. The engine mounting stance occupies 25.1in of length, 19.4in of width, and 21.8in of height, serviced by a 0.92 US gal oil pan.

Key Features of Volvo Penta D1-30

Offshore cruising sailors buy Volvo Penta D1-30 bobtail marine engines to power 29ft to 36ft sailing yachts through heavy tidal gates. The compact bare bobtail layout simplifies sailing yacht auxiliary engine repower projects through compatibility with multiple mechanical transmissions.

• Cam-driven mechanical in-line injection pumps supply precise fuel metering across the 850 to 3,200 RPM range.
• Naturally aspirated 1.1L displacement produces 26.0BHP continuous output with minimal exhaust smoke.
• Sound-damped air intake silencer suppresses induction drone inside confined boat living quarters.
• Tubular heat exchanger maintains closed-circuit engine coolant temperature in harsh saltwater environments.
• High-output 115A marine alternator restores auxiliary battery banks during short harbor motoring runs.
• Dedicated bellhousing mounts flexible marine dampers compatible with MS15A and ZF 15M transmissions.
• Neoprene impeller seawater pump circulates cooling water into the water-injected exhaust mixer elbow.

Dynamometer Testing Bench Load Ratings

Dynamometer load verification proves 26.0BHP continuous power and 46 ft-lbs of shaft torque at 3,000 RPM, peaking at 27.3BHP at 3,200 RPM. Exhaust pyrometer temperatures hold under 910°F ahead of the water-injected exhaust mixer elbow. The closed-circuit freshwater loop stabilizes at 180°F through the tubular heat exchanger under continuous full-load testing. Main bearing oil pressure registers 50 PSI at cruising RPM, while crankshaft journal concentricity checks confirm runout below 0.0004in TIR across all bearing contact surfaces.

Field Operation Controls Installation Boundaries

Mechanical control cables require 3 lbs of linear force to advance the internal fuel rack across the governor band. This compact three-cylinder diesel is not designed for fast planing hulls, commercial harbor tugs, or vessels lacking raw water strainers. Never select this sailing yacht auxiliary engine repower for displacement hulls exceeding 36ft or craft unable to maintain adequate engine compartment ventilation.

• Drain engine lube oil and replace spin-on oil filters every 150 operating hours.
• Inspect raw water pump impellers and replace sacrificial zinc anodes every 12 months.
• Measure and adjust mechanical overhead valve clearances to 0.008in cold every 500 operating hours.

Factory Warranty Marine Crate Manifest

Volvo Penta covers this engine with a 2-Year limited warranty plus additional 3-Year major component protection. The factory shipping crate contains the bobtail diesel engine, 12V 1.1 kW starter, 115A alternator, four flexible engine mounts, wiring harness, basic instrument display panel, oil pressure switch, and operator maintenance manuals.