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23 Products

23 Item(s)


This is a listing of items that have been fitted to Thornycroft 251 engines throughout production. We hope this page will help you; if you do not see what you are looking for, please contact us. We may be able to help.

The inclusion of items on this page does not infer that these items are genuine Thornycroft spares. Please check carefully the suitability of the item for your own application.

Gasket sets listed do not contain gaskets for marinisation components.

Requests for Thornycroft spares should always be accompanied by the engine number / build list.

The Thornycroft 251 is a 4 cylinder, 4 stroke, vertical, inline 4.165L diesel engine, based on the naturally aspirated Ford 2722 Dover industrial engine.

The 251 engine replaced the popular and long running Thornycroft 250, and proved just as popular with commercial and private operators, offering good horsepower, and excellent reliability. The engine was produced in either heat exchanger or keel cooled versions, the keel cooled version being a popular power plant for lifeboats.

Thornycroft always used a separate manifold and heat exchanger on their engines. These can be replaced by the latest combined heat exchanger manifold unit. Thornycroft did not produce a turbo charged version of this engine.

From the MS-01-251 Thornycroft leaflet, ratings are as follows:

1250RPM 39.5BHP 8.72LPH, 1800RPM 61.8BHP 12.9LPH, 2200RPM 72.9BHP 15.3LPH, 2600RPM 77.3BHP 16.6LPH.

Intermittent rating is shown as 85BHP.

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