Water in Your Diff: How It Gets In, What It Destroys, and What It Costs You
One of the most destructive problems a differential can have. Here is how water gets past the seals, what it does to the bearings and how to stop it.
George Bull, owner 1 min read
A hot diff that drops into a cold river sucks air, and water, straight in through the breather. By the time the oil has gone milky the bearings are already rusting from the inside.
How it gets in
Most water comes in through a short factory breather or a tired pinion seal. Boat ramps, river crossings and even a water blaster aimed at the back axle can do it.
What it costs
Caught at the next oil change, it is a flush and refill. Left for a few months, it is bearings, seals and often a gearset. If you cross water regularly, fit an extended breather and change the oil straight after a big trip.
Think your diff is making noise? Around 120 rebuilt exchange diffs on the shelf for 30 plus makes and models. Fitted here in Sydenham, or shipped anywhere in NZ with free freight both ways.
Water damageBreathersMaintenance4WD
