Lombardini – NEW Lombardini LDW 702M 18hp Marine Diesel Engine & Gearbox

Lombardini LDW 702M – Professional Overview

The Lombardini LDW 702M 18hp Marine Diesel Engine & Gearbox belongs to Lombardini Marine’s range of compact inboard diesel engines developed specifically for marine propulsion. Lombardini describes the LDW 702M as a lightweight and compact four-stroke marine diesel designed with reliability, durability, and fuel economy in mind.

The engine uses a two-cylinder configuration with 686 cc displacement and produces up to 18hp / 13.2 kW at 3,600 rpm. Its compact architecture makes it particularly relevant to smaller vessels and repower applications where available engine-room space and installation weight are important considerations.

This particular package is supplied as a complete marine propulsion solution rather than simply as a bare engine. The supplied configuration includes flexible mounts, a control panel, wiring loom, and a Technodrive marine gearbox, providing buyers with the major components needed to integrate the engine into a compatible vessel.

The supplied product information also identifies the engine as brand new and crated, with Lombardini warranty coverage stated by the seller.

Marine Applications and Installation

The LDW 702M is intended for inboard marine propulsion and is appropriate for vessels whose propulsion requirements fall within its 18hp output range.

Its compact dimensions and relatively low weight make it particularly useful for smaller boats and repower projects where a larger engine would create unnecessary installation challenges.

Lombardini’s official specifications identify a bore and stroke of 75 × 77.6 mm, a maximum operating speed of 3,600 rpm, and a compression ratio of 22.8:1.

The engine is designed around marine-specific equipment rather than being a generic industrial diesel adapted for boating. Its configuration includes a seawater pump, water-injected exhaust arrangement, corrosion protection, and freshwater cooling through a heat exchanger.

For a repower installation, the vessel’s existing engine mounts, shaft alignment, exhaust system, propeller, controls, and gearbox arrangement should be checked for compatibility before purchase.

Cooling, Construction, and Marine Durability

The LDW 702M uses a freshwater cooling system with a heat exchanger, separating the engine’s internal freshwater cooling circuit from the seawater circuit used to remove heat during operation. Lombardini also specifies zinc anode protection and special anti-corrosion surface treatments for its marine engines.

The engine block is constructed from cast iron, while the cylinder head is made from aluminium. Lombardini specifies reborable cylinder liners and a one-piece aluminium cylinder head for the LDW 702M.

The marine configuration also incorporates a stainless-steel water-injected exhaust elbow and self-priming seawater pump. These components are designed specifically around the requirements of marine engine operation.

The result is a purpose-built compact marine diesel engine designed for sustained service in the demanding marine environment.

Engine and Gearbox Package

One of the major advantages of this configuration is that the engine is supplied together with a Technodrive marine reversing gearbox rather than requiring the buyer to source the propulsion drive separately.

Lombardini documentation lists the LDW 702M with Technodrive reversing gear, including TMC40 configurations. Official technical documentation identifies a dry engine weight of approximately 99 kg with the Technodrive TMC40 gearbox.

Technodrive gearbox options include different reduction ratios depending on the specific installation. Lombardini parts documentation identifies TMC40 configurations including 2.6:1, 2:1, and 1.5:1 ratios, so the exact gearbox ratio should be confirmed for the package being supplied.

The correct reduction ratio is important because it affects propeller speed and must be matched to the vessel, propeller, shaft arrangement, and engine operating range.

Electrical System and Controls

The package is designed for straightforward marine engine operation and includes an electric starting system and marine control equipment.

Lombardini’s published marine specifications identify a 12V electrical starting system and a 120A alternator for the LDW 702M.

The marine package can also include Lombardini’s Digital De Luxe instrument panel and wiring loom. Lombardini identifies the panel as part of the standard equipment on the inboard engine configuration, while its documentation lists a 10-metre loom.

The supplied product description specifically includes a control panel and wiring loom, making this configuration more comprehensive than an engine-only purchase.

Who This Engine Package Is Best For

The Lombardini LDW 702M 18hp Marine Diesel Engine & Gearbox is particularly suitable for:

• Boat owners replacing an existing small inboard diesel
• Marine repower projects requiring approximately 18hp
• Smaller sailboats and displacement vessels
• Owners looking for a compact two-cylinder diesel
• Buyers seeking an engine and gearbox supplied as one package
• Marine applications where low installation weight is important

The engine is not intended to be selected solely on horsepower. Correct installation requires consideration of the vessel’s displacement, propeller requirements, shaft arrangement, existing engine-bed dimensions, exhaust configuration, and gearbox reduction ratio.

Technical Specifications

The core engine specifications above are based on Lombardini Marine’s published technical information.

Ordering, Repower, and Support

The supplied package is intended to simplify the purchase of a complete marine diesel engine and gearbox rather than requiring buyers to source every major component separately.

Before ordering, buyers should confirm the existing engine model, gearbox, shaft alignment, propeller specifications, engine-bed dimensions, exhaust arrangement, and available engine-room space.

For replacement applications, providing details of the existing installation can help determine whether the LDW 702M package is an appropriate replacement. Particular attention should be given to the Technodrive gearbox ratio, as different reduction ratios may be available and the correct selection depends on the vessel and propulsion system.

The product information supplied with this listing states that the package is brand new, supplied crated, and covered by Lombardini warranty. Warranty terms and the exact components included in the final package should be confirmed at the time of purchase.

Frequently Asked Questions

How much power does the Lombardini LDW 702M produce?

The Lombardini LDW 702M produces 18hp (13.2 kW) at 3,600 rpm in its marine configuration. The engine uses two cylinders and has a displacement of 686 cc, making it a compact option for vessels requiring modest inboard diesel propulsion.

Is the Lombardini LDW 702M freshwater cooled?

Yes. The LDW 702M is designed with freshwater cooling through a heat exchanger, together with a seawater pump for the marine cooling circuit. Lombardini also specifies zinc anode protection and anti-corrosion treatment for the marine engine.

Does the LDW 702M come with a gearbox?

The product package supplied here includes a Technodrive marine reversing gearbox. Lombardini’s technical documentation confirms TMC40 gearbox configurations for the LDW 702M. The exact reduction ratio should be confirmed before purchase because different gearbox configurations are available.

What is the weight of the LDW 702M with gearbox?

Lombardini’s published technical information gives a dry weight of approximately 99 kg with the Technodrive TMC40 reversing gear. The final shipping or installed weight can be higher depending on the complete package and additional components.

What type of boats is the LDW 702M suitable for?

The LDW 702M is designed for inboard marine applications requiring approximately 18hp. It can be considered for smaller vessels, sailboats, displacement boats, and compatible repower projects where its compact dimensions and relatively low weight are advantageous.

What gearbox ratio does the Technodrive gearbox use?

The exact ratio depends on the gearbox configuration supplied. Lombardini documentation identifies TMC40 configurations with ratios including 2.6:1, 2:1, and 1.5:1. The correct ratio should be selected according to the vessel, propeller, shaft system, and engine application.

Is this a new engine?

Yes. The supplied product information identifies the package as a brand-new, crated Lombardini LDW 702M marine diesel engine package. It is described as including flexible mounts, control panel, wiring loom, Technodrive gearbox, and Lombardini warranty coverage.