Vetus M4.35 Inboard Shaft Marine Diesel Engine

Description

Propel displacement cruising hulls through heavy tidal rips with the Vetus M4.35 Inboard Marine Diesel Engine. This 4-Cylinder 1.8L mechanical diesel produces 29.5BHP continuous power at 2,800 RPM for sailboats and launches. Mechanics must complete manual valve clearance adjustments on schedule and inspect the raw water impeller to prevent thermal accumulation in restricted engine bays.

Structural metallurgy pairs an ASTM gray cast iron monobloc with parent cylinder bores and an overhead-valve cylinder head. The 12V negative ground electrical plant carries a 1.7 kW electric starter motor and a 110A marine alternator. Dry weight spans 309 lbs without marine transmission. The engine mounting stance occupies 26.8in of overall length, 18.9in of width, and 22.6in of height, serviced by a 1.27 US gal lube oil pan.

Key Features of Vetus M4.35

Cruising sailboat skippers buy Vetus M4.35 inboard marine diesel engines to maintain dependable speed against coastal currents. The platform accelerates sailing yacht auxiliary engine repower projects through standardized mounting spacing and low-profile dimensions.

• Mechanical in-line injection pump ensures crisp throttle response across the 800 to 3,000 RPM speed range.
• Naturally aspirated 4-Cylinder configuration produces smooth rotational balance without heavy secondary vibrations.
• Cast aluminum acoustic cover dampens mechanical valvetrain clicking inside living quarters.
• Tubular heat exchanger maintains closed-circuit engine coolant temperature in saltwater conditions.
• High-output 110A marine alternator restores auxiliary battery bank capacity during brief motoring periods.
• Dedicated bellhousing mounts flexible marine dampers compatible with Technodrive TMC 60P transmissions.
• Neoprene impeller seawater pump circulates raw cooling water into the water-injected exhaust mixer.

Dynamometer Performance Bench Test Data

Continuous dynamometer testing proves 29.5BHP continuous power and 58 ft-lbs of shaft torque at 2,800 RPM, peaking at 33.0BHP at 3,000 RPM. Exhaust pyrometer readouts remain under 920°F upstream of the water-injected exhaust elbow. The closed-circuit freshwater loop stabilizes at 178°F through the tubular heat exchanger under continuous full-load testing. Lube oil pressure maintains 50 PSI at cruising RPM, while crankshaft journal concentricity checks confirm runout below 0.0004in TIR across all five main bearing journals.

Field Operation Controls Installation Boundaries

Mechanical control cables require 4 lbs of linear force to advance the internal fuel rack across the governor range. This naturally aspirated diesel is not built for fast planing skiffs, heavy offshore tugs, or vessels lacking raw water strainers. Never select this sailing yacht auxiliary engine repower for displacement hulls exceeding 38ft or craft unable to maintain adequate engine compartment ventilation.

• Change engine oil and replace the spin-on lube filter every 150 operating hours.
• Inspect the raw water rubber impeller and replace zinc anodes every 12 months.
• Check mechanical overhead valve lash clearances to 0.010in cold every 500 operating hours.

Factory Warranty Marine Crate Manifest

Vetus backs this inboard package with a 5-Year leisure and 3-Year commercial marine manufacturer warranty. The factory sea-shipping crate includes the bobtail diesel engine, 12V 1.7 kW starter, 110A alternator, four flexible engine mounts, wiring harness, basic instrument display panel, oil pressure switch, and operator maintenance manuals.