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Manual to hydraulic gearbox

reverse gearbox

Fitting twin disc hydraulic gearboxes to Gardner engines fitted with Gardner 2UC & 3UC gearboxes - or other manufacturers equivalent. Pictured above is an 8L3B engine fitted with the standard 3UC 3:1 reverse gearbox. The hydraulic replacement is the Twin Disc 3:1 reverse gearbox shown on the right. We can also convert the Gardner 'LW', 'LXB' and 'L3" range of engines.

Cooling Systems

Sea water to fresh water cooling

Converting the engine cooling system from raw sea water cooling, to a closed 'circuit' fresh water system using a heat exchanger or keel cooling. Fitting of header tank, heat exchanger and all pipework etc.

Exhaust Manifold cooling

Conversion of exhaust manifold from dry to water cooled exhaust manifold, which reduces engine room noise and temperature.

Engine fitted with water jacketed exhaust manifold

Engine fitted with water jacketed exhaust manifold

Single lever controls

single lever

The Gardner Single Lever Control is a device which enables the operation of the reverse gear and change of engine revolutions to be controlled by one lever. Suitable for fitting to either No. 2UC or No. 3UC Gardner Unit Construction Reverse Gears.

Flexible Engine Mountings

flexible engine mountings

The use of flexible engine mountings on marine installations helps to minimize transmission of sound and vibrations from the engine(s) to the structure of the vessel. The the extent to which this is necessary will depend upon the type of vessel and the pupose for which it is designed. When flexible engine mountings are used it will, of course, be necessary to introduce flexible connections in all pipework to and from the engine and in some cases, depending upon the unsupported length of the intermediate shaft, to have one or more flexible couplings in the shaft line.

Engine Room Ventilation

Efficient engine room ventilation is essential for correct engine operation and for the protection of the vessel from adversely damp conditions.

In general, the smaller the engine room the greater the need for a forced air ventilation system. Ray Harrison can convert your engine room to optimum airflow requirements, taking into account the following factors.

Adequate ventilation is essential in order that:

If there is insufficient circulation of air at or near external air temperature around the outer surfaces of a marine engine unit, the temperature of the engine oil, reversing gear oil, reduce gear oil, etc., will be in excess of designed values. In addition, engine room 'electrics,' fuel, etc., will be undesirably heated.

The power rating of marine engines, which is regulated by the volume setting of the fuel injection pump, is set appropriately for the climatic conditions in which they are to operate. If the air in the engine room becomes unduly heated, the engine is unable to induct sufficient weight of air to provide complete combustion of its designed fuel injection volume and it will not develop its designed horsepower and R.P.M. The British Standard derating for atmospheric temperature is 2% per 10°F and it will readily be seen that if an engine be operated in a 120°F atmosphere when it is designed for a 60°F atmosphere it should have its fuel supply reduced by 12% and, consequently, its power output reduced.

Incomplete combustion has a cumulative effect on engine room temperature. The products of incomplete combustion can cause lubricant contamination, internal deposits and fouling, also high piston, valve and sprayer temperatures, etc., and may lead to unreliability and high maintenance.