Time:  approx 1 hr

Difficulty: moderate  (access)

Cost: $25-40

BACKGROUND

On a turbo charged engine, vacuum in the intake manifold is not always present. Rather than air being drawn in by the pistons, creating vacuum, the turbo pressurizes the manifold. The brake booster utilizes vacuum for brake-assist. With turbo engines, an alternate vacuum source is required.

OIL LEAK

The 2.7L and 3.5L EcoBoost engines are prone to an oil leak at the vacuum pump where it mates to the cylinder head. The leak is often confused with a leaking valve cover gasket. Oil runs down the back of the head and drips onto the exhaust. In some cases, the oil will make it to the floor, but often the leak is first noticed as a burnt-oil smell in the cab at slow speeds or when stopped.

REPLACEMENT

The vacuum pump can be found on the back of the cylinder head on the passenger side. The spacing between the head and the firewall is limited, making the repair more difficult. A good mirror, light, and the right tools will make the job easier. Before you start the job, make sure you've already purchased the specialty o-ring and silicone.

The video below shows the vacuum pump oil leak repair on a 2016 Ford F150 pickup with the 3.5L EcoBoost.