Get some wading plugs from your dealer and fit them to the threaded holes under the bellhousing and cambelt cover. Good wiring connection will keep a diesel running happily at normal wading depth but petrol engines suffer from wet ignition leads and coil, and condition inside the distributor.
Silicon sealant helps seal ignition leads, spark plug sockets and distributer cap to its body joint. A watertight cover can be fitted over coils and distributors. A latex glove makes a good four cylinder distributor cover with the leads protruding from the snipped fingers.
A electric fan with a cab control to switch it off when wading will stop fan blades splashing water up onto the engine. But fit a good warning lamp or buzzer to remind you it’s off. Disconnect every joint from the air filter to the engine, including turbo and intercooler hoses, and seal with thin layer of silicon. Check turbo intercooler hoses for holes and splits. Refit with good clips and apply sealant around each joint.
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