Volvo Penta D1-20 Inboard Diesel MS15A Gearbox Package

Description

Need a down-angle shaft output to keep your engine level in a narrow bilge? The Volvo Penta D1-20 MS15A Marine Engine integrates an 8-degree down-angle gearbox with an inline 3-Cylinder 0.8L diesel generating 18.0BHP continuous output at 3,000 RPM. Operators must check transmission shift cable stroke during installation and replace the raw water impeller on strict seasonal schedules.

Monobloc engine casting relies on an ASTM gray iron block with integrated parent cylinder bores and an overhead-valve cylinder head. The 12V negative ground electrical plant carries a 1.1 kW starter motor and a 115A marine alternator with battery sensor regulation. Total package dry weight measures 262 lbs including transmission. Physical chassis envelope dimensions require 26.4in length, 17.9in width, and 19.8in height, with a 0.74 US gal oil pan.

Key Features of Volvo Penta D1-20

Cruising monohull skippers buy Volvo Penta D1-20 MS15A marine engines to solve severe propeller shaft downward angles in shallow bilges. The integrated transmission package simplifies sailing yacht auxiliary engine repower projects through matched factory components.

• MS15A mechanical transmission provides an 8-degree down-angle output to keep engine mounting level.
• Cam-driven in-line injection pumps supply accurate fuel metering across the 850 to 3,200 RPM range.
• Inline 3-Cylinder layout produces smooth rotational balance without heavy secondary cabin vibrations.
• Sound-damped air intake silencer traps induction hiss inside small sailboat cabins.
• High-capacity 115A marine alternator charges auxiliary house battery banks during harbor motoring runs.
• Tubular heat exchanger maintains stable engine coolant temperatures in hot coastal sea water.
• Neoprene impeller seawater pump circulates cooling water into the water-injected exhaust mixer elbow.

Dynamometer Performance Bench Test Ratings

Dynamometer load verification proves 18.0BHP continuous power and 31 ft-lbs of shaft torque at 3,000 RPM, peaking at 18.8BHP at 3,200 RPM. Exhaust pyrometer temperatures hold under 890°F upstream of the water-injected exhaust 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 48 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 propulsion package 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 31ft or craft unable to maintain adequate engine compartment ventilation.

• Drain engine lube oil and replace spin-on oil filters every 150 operating hours.
• Inspect MS15A transmission fluid level and replace zinc anodes every 12 months.
• Measure and adjust mechanical overhead valve clearances to 0.008in cold every 500 operating hours.

Factory Warranty Marine Crate Inclusions

Volvo Penta covers this complete transmission package with a 2-Year limited warranty plus additional 3-Year major component protection. The export transport crate contains the diesel engine, MS15A gearbox, 12V 1.1 kW starter, 115A alternator, four flexible engine mounts, wiring harness, instrument display panel, and operator maintenance manuals.