Reeds Outboard Motor Troubleshooting Handbook by Barry Pickthall

Author:Barry Pickthall
Language: eng
Format: epub
Publisher: Bloomsbury Publishing
Published: 2013-04-15T00:00:00+00:00

Chapter 7

Cooling System

AIR COOLED OUTBOARDS

Simple outboards like the British Seagull and Briggs & Stratton marques have given way to complex 4-stroke engines with raw water cooling. Yet these famous brands are still sought after second-hand purely because of their simplicity and ease of service.

Airflow is generated by a fan within the flywheel that directs air over cooling fins within the cylinder head casting. The only thing that can go wrong is if oil and dirt is allowed to build up around these fins, or the hood or deflector plates, which channel the air around the engine, are removed or damaged. A periodic clean is all that should be needed to keep these old stalwarts running at the right temperature.

AIR COOLED HEAD/WATER COOLED EXHAUST

There are a large number of small second hand 2-stroke outboards still running that combine an air-cooled head with a water cooled exhaust system, including British Seagull. These have a water inlet on the forward edge of the skeg and a pump within the leg which pushes raw water around a water jacket surrounding the exhaust. For servicing of the water pump, go to here.

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