Oil leaks on the 7.3 are common. One of the most common areas to leak, is from the turbo pedestal. It’s also one of the most commonly misdiagnosed leaks as the oil generally leaks down the back of the engine making it look like a rear main seal leak. Let’s dive into the different leaks and how to diagnose them.

EBPV Actuator Leaks

The EBPV system is designed to help the engine warm up faster in cold weather. The EBPV actuator, located on the pedestal, uses engine oil to move a piston that controls the backpressure valve. Over time, the internal seals in the actuator wear out, allowing oil to leak out through the actuator shaft and base. These leaks will get worse during colder temperatures, when the actuator is doing work.

The leaks will be visible around the actuator, typically as grimy buildup. But when the leaks get bad enough, you’ll see oil in the valley, puddled below the turbo pedestal. It is also common for oil to shoot onto the passenger up pipe. When this happens, you’ll see smoke when hot, smell burning oil, and likely oil down the passenger side of the engine near or on the starter. Leaks down the back of the engine are also possible. You’ll see oil dripping from the inspection cover on the transmission, which will look like a rear main seal leak.

Repair comes in one of three ways: Replace the pedestal with a new one; rebuild the EBPV pedestal (a fairly simple procedure); delete the EBPV (a subject for a whole other article); or replace the pedestal with a new one.

Pedestal O-Ring Seal Leaks  

The Garrett turbo used on the 7.3 has its oil feed and oil return through the pedestal. Leaks are possible in two areas (technically four, as each area has a return and a supply). There are O-rings at the base of the pedestal where it mates to the block (towards the rear of the pedestal), as well as at the top where the turbo mounts to the pedestal. If it’s the top O-rings, you’ll see oil from between the turbo and the pedestal. If it’s from the lower O-rings, oil will only appear towards the base. In either case, oil may pool in the back of the valley and may also travel down the back side of the engine, as discussed with the EBPV actuator. With a lower O-ring leak, you’ll almost always have some oil down the back side of the engine due to the location of the seals, no matter how bad the leak may be.

Repair is as simple as removing the affected part and replacing the O-rings. Pull the turbo only if it’s an upper leak. Pull the turbo and pedestal if it’s a lower leak. Make sure the mounting surfaces are clean and undamaged before reinstalling. Damage can cause the surfaces not to mate perfectly, and therefore, the O-rings will not seal correctly.

For Either Leak

Oil leaks typically coat the entire area with oil and road grime, especially if they’ve been leaking for some time. You may need to thoroughly clean the pedestal to diagnose the issue properly. Oil dye can also be a huge help here, as it will only show new oil seepage.

***Disclaimer: The information provided on this blog is for informational purposes only. We share our knowledge and experience, but we are not liable for any damages, injuries, or losses that may occur as a result of using this information. Situations are rarely cut and dry in the automotive world. Your situation will likely be somewhat different than what we describe here.  Use your best judgment and always consult a qualified professional for automotive repairs and modifications. Your safety is your responsibility.