Vetus M3.29S Saildrive Marine Diesel Engine Package

Description

Supplying quiet auxiliary thrust with minimal hydrodynamic drag is the primary function of the Vetus M3.29S Saildrive Marine Diesel Engine. This 3-Cylinder 1.0L package outputs 24.5BHP continuous power at 3,400 RPM for cruising monohulls and catamarans. Owners must observe the seven-year hull diaphragm renewal schedule and inspect saildrive raw water intake ports for marine growth.

The structural base combines an ASTM gray cast iron monobloc with parent bores and a rigid overhead-valve cylinder head. Electrical architecture features a 12V negative ground system powered by a 1.2 kW starter motor and a 75A marine alternator. Dry mass spans 216 lbs excluding the saildrive lower leg. The engine mounting stance occupies 22.2in of length, 18.1in of width, and 21.3in of height, holding 0.98 US gal of oil.

Key Features of Vetus M3.29S

Cruising yacht skippers buy Vetus M3.29S saildrive marine diesel engines to secure quiet motor-sailing without propeller shaft alignment concerns. The integrated drive unit supplies a dependable sailing yacht auxiliary engine repower configuration for offshore yachts up to 35ft.

• SeaProp 60 saildrive leg eliminates shaft seal packing drips and tedious engine alignment procedures.
• Three-cylinder inline engine layout produces smooth rotational balance with minimal hull-transmitted vibration.
• Cast aluminum acoustic cover suppresses intake air noise and valvetrain clicking inside aft cabins.
• Saildrive leg raw water ingestion feeds cooling fluid to the tubular heat exchanger core.
• High-capacity 75A marine alternator restores shipboard auxiliary battery banks during harbor motoring runs.
• Dedicated saildrive foundation bed cushions mechanical shock loads from the hull laminate.
• Multi-plunger mechanical fuel injection pump ensures consistent cylinder firing across changing sea loads.

Saildrive Dynamometer Testing Thermal Limits

Dynamometer load verification proves 24.5BHP continuous output and 38 ft-lbs of shaft torque at 3,400 RPM, peaking at 27.2BHP at 3,600 RPM. Raw seawater ingestion through the saildrive leg maintains tubular heat exchanger coolant temperatures stabilized at 178°F under continuous full-load motoring. Exhaust pyrometer temperatures remain under 910°F ahead of the water-injected exhaust mixer. Main journal oil pressure registers 50 PSI at cruising RPM, while crankshaft journal runout measures within 0.0004in TIR across all bearing contact surfaces.

Field Usability Protocols Installation Boundaries

Single-lever sail control levers require 4 lbs of smooth hand effort to advance the mechanical governor across the operating band. This saildrive powertrain is not built for heavy commercial workboats, steel canal narrowboats, or high-speed planing hulls. Never select this sailing yacht auxiliary engine repower package for craft without a reinforced GRP saildrive foundation bed or hulls requiring traditional shaft logs.

• Change engine oil and replace the spin-on lube filter every 150 operating hours.
• Inspect lower saildrive gear lube 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 complete saildrive package with a 5-Year leisure and 3-Year commercial marine manufacturer warranty. The shipment crate includes the bobtail diesel engine, SeaProp 60 saildrive lower unit, mounting bed frame, 12V 1.2 kW starter, 75A alternator, wiring harness, instrument display panel, and factory maintenance documentation.