Vetus M4.35 Inboard Shaft Marine Diesel Engine

Description

During long offshore motor cruising shifts, the Vetus M4.35 Shaft Marine Engine provides dependable four-cylinder diesel propulsion to cruising sailboats, motor sailors, and small trawlers up to 36 feet. Displacing 1,318 cc across four cylinders, this naturally aspirated block outputs 33 horsepower at 3,600 RPM. Swirl pre-combustion chamber fuel injection ensures smooth operation, low smoke emissions, and quiet running during long passages.

High-grade cast iron forms the monolithic cylinder block, equipped with hardened parent-bore cylinder walls that resist scuffing. The fresh water cooling system integrates an aluminum heat exchanger housing with a cupronickel tube stack and bronze sea water pump. Dry weight without transmission is 298 lbs, supported by a 4.2-quart oil pan, SAE 6 housing, and 0.312-inch hose barb fuel fittings.

Key Features of Vetus M4.35

Cruising sailors buy Vetus M4.35 inboard engine packages to replace obsolete raw-water cooled engines inside sailboat engine compartments. The balanced four-cylinder configuration delivers dependable auxiliary propulsion without adding excess weight to the boat structure.

• 33 horsepower rating propels displacement sailing craft at hull speed in head seas.
• 110-amp 12-volt alternator recharges house battery banks during harbor motoring maneuvers.
• Cast aluminum top cover absorbs mechanical clatter to keep sailboat cabins quiet.
• Cupronickel tube heat exchanger protects cylinder jackets from salt scale accumulation.
• Electric glow plugs initiate rapid combustion down to freezing bilge temperatures.
• Vetus M4.35 auxiliary efficiency lowers fuel burn on extended coastal passages.
• Flexible rubber engine mounts dampen four-cylinder reciprocating pulses to protect stringers.
• Front-mounted sea water pump allows quick neoprene impeller replacement through hatch doors.

Combustion Dynamics Thermal Capacities

Coolant thermostats regulate internal temperatures between 168°F and 182°F under continuous motoring operations. The four-cylinder block develops 55 lb-ft of torque at 2,300 RPM, giving displacement sailboats power to punch through tidal headlands and harbor chop. Rated for M4 pleasure craft service, thermal heat rejection transfers 24 kW into raw water cooling circuits. Specific fuel consumption averages 235 g/kWh, burning about 0.54 gallons per hour at standard yacht cruising speeds across open coastal waters.

Exhaust Integration Bay Clearances

A water-injected exhaust elbow attaches to 2.0-inch wet exhaust hose, meeting ABYC P-1 standards for auxiliary sailboats. Mounting brackets adjust across 16-inch to 19-inch stringer centers, preserving 2.0 inches of clearance below the oil pan. Flexible elastomer mounts absorb vibration from the hull.

Service Schedules Application Constraints

Direct mechanical Morse cables connect helm control levers straight to governor and gearbox selectors for immediate response. Operators inspect raw water strainers, check oil levels, and monitor belt tension before getting underway. This engine package is not engineered for offshore planing hulls, commercial trawlers, or raw water cooled bilges without fresh water heat exchangers.

• Inspect sea water intake strainer before each shift.
• Inspect and clean heat exchanger zincs every 150 hours.
• Change engine lube oil, gear oil, and filters every 200 hours.

Warranty Terms Package Manifest

Recreational buyers receive 5-Year limited warranty protection on base castings and mechanical components. The shipping crate contains the bobtail engine package, vibration isolators, digital instrument cluster, five-meter extension wiring harness, oil extraction pump, and a complete technical service manual.