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Marine Engine

Ford Anglia 105E - "Marine" Engine

Petrol engines suitable for installing into boats were (and still are) developed from various Ford engines. This allowed all of those potential “Anglia” sailors out there to take to the water in an engine that they were already familiar with.

These various Ford engines were marinised by different manufacturers.
Amongst these were Parsons, CT Marine, Wortham Blake and Watermota.


There are various types of Watermota petrol engines, but the most popular are the Sea Wolf and the Sea Tiger, the names of which were used on both the pre-crossflow and crossflow Ford engines. The 105E pre-crossflow 997cc engine was called the Sea Wolf and the 1500cc engine was called the Sea Tiger. With the advent of the crossflow engine from Ford in 1967 / 68, the Sea Wolf name was now used on the 1100cc crossflow engine and the name Sea Tiger was used on the 1600cc engine

watermota engine

To differentiate the engines when ordering spares, the pre-crossflow engines became known as the Sea Wolf Mk 1 and Sea Tiger Mk 1 and the crossflow engines, Sea Wolf Mk 2 and Sea Tiger Mk 2

The different versions of the engines are easy to distinguish. The pre-crossflow versions have the carburettor on top of the exhaust manifold and the crossflow versions have the carburettor on the opposite side of the head to the exhaust manifold, the gases flow across the head hence the term 'crossflow'.

Marinising the Engine

The Marine engine is not quite the same as your standard car engine. There are certain things that need to be done to make it safe to operate within the environment of a boats engine bay.

The most notable differences between a marine engine and an automotive engine are the electrical system, the cooling system, the exhaust system, and the fuel system. Additionally, items such as heads and cams are usually different.

Here we will just cover a few of the differences to give you a flavour of the modifications that are made to a car engine to marinise it (this is not intended to be an exhaustive list).

In a car any petrol or vapour leak quickly disperses through the bottom of the engine bay. In a boat, the sealed engine compartment does not afford the same luxury. Therefore the electrical system is modified to eliminate the possibility of sparks occurring within the system. Marine starters and alternators are modified so they won't release sparks and ignite and gas vapour that may be in the engine compartment.

Marine carburettors are modified so they won't flood outside the carburettor. If there is a problem or there is too much fuel in the carburettor, it will flood back into the engine.

On a boat there is a constant flow of new water sucked up from the lake or the ocean which circulates through the cooling system (raw water cooling). This type of system is extremely corrosive to the pump especially if the boat sees salt water. An automotive style pump, with its stamped steel impeller, would fail due to corrosion in a short time. Therefore a marine pump with a special ceramic seal, stainless steel backing plate, and a bronze impeller to resist corrosion is usually fitted. Two other areas of the cooling system that are also marinised are the head gasket and the core plugs (which should be brass instead of steel)

watermota book
Watermota - Instruction Manual and Parts List

Printed in England
Printed in February 1973

A 135 x 210mm - 20 page instruction book for the Watermota Sea Wolf, Sea Otter and Sea Tiger Engines.

(Article Copyright MellY Designs - Please do not Reproduce without Permission)

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