A few of my off road adventures from 2005. In and around Victoria, including The Yarra River, little and big Peninsula Tunnel, and Bunyip State Park

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Air Intake Water and engines do not mix very well, and when they do it almost always results in bent pistons, valves and crankshaft commonly called “hydro-locking”. If you think this sounds expensive you're right. The positioning of the air intake is critical to how well a vehicle can handle a crossing. For example certain Toyota models have their air intake directly behind the headlight, which is great to allow cold air into the engine but unfortunately is equally as great in directing water into the engine (An easy fix for this is to remove the plastic tubing from the air cleaner to the headlight when crossing water). NEVER attempt a water crossing where the water depth is above the air intake height. If you intend doing regular water crossings, its a good idea to fit a snorkel as it raises the air intake to your roof line. It doesn't mean you can use your 4x4 as a submarine!