Thornycroft TK-40 43 HP Marine Diesel Engine & Gearbox Package, PRM 125D2
The Thornycroft TK-40 is a new four-cylinder, 2.2-liter marine diesel engine rated 43 HP at 2,600 RPM, packaged with a PRM 125D2 gearbox. It is heat exchanger cooled and is CE and RCDII compliant for leisure and commercial use.
The standard package includes the PRM 125D2 gearbox, a control panel, a 4.0 m wiring extension harness and flexible engine mountings. The photos show the engine fitted with the optional PRM150D2 gearbox. Other gearbox options are PRM150 D1.5, D2 and D3, PRM280 D2 and D3, and Technodrive TM345A1.5, TM345A2.0 and TM345A2.47; the engine can also be supplied as a bobtail or with an adaptor for an existing gearbox.
Adaptor and drive plates are offered for PRM125 / PRM150 / TMC60, PRM260 / PRM 280 and Borg Warner / ZF Hydraulic / SAE7 gearboxes. Standard or deluxe control panels can be chosen with 4.0 m, 6.0 m or 8.0 m extension harnesses with waterproofed connectors. Further options are a PTO stub shaft on the crank, hot water connections for a calorifier, a deck wash pump and a second 100A alternator.
Highlights
43 HP at 2,600 RPM, four cylinders, 2.2 liters
Heat exchanger (fresh water) cooling, electric start
PRM 125D2 gearbox, control panel and 4.0 m harness included
Flexible engine mountings included
CE and RCDII compliant for leisure and commercial use
Photos show optional PRM150D2 gearbox
Specifications
Brand | Thornycroft |
Model | TK-40 |
Horsepower | 43 HP @ 2,600 RPM |
Cylinders | 4 |
Displacement | 2.2 L |
Fuel | Diesel |
Cooling | Heat exchanger, fresh water |
Starting | Electric start |
Gearbox (Standard) | PRM 125D2 |
Extension Harness | 4.0 m |
Compliance | CE, RCDII |
Year Built | 2025 |
Good to know
Installation, rigging and commissioning by a qualified marine technician are recommended; follow the manufacturer's pre-delivery and break-in procedures.

