Diagnosing Oil Leak on Ford's 7.3L Super Duty Truck Diesel Engine - Engine Builder Magazine

Main Navigation

Advertisement
Social Connect
Resources
Our Brand Family
Engine Builder Magazine
Content for engine professionals and enthusiasts
Tech Center

Diagnosing Oil Leak on Ford’s 7.3L Super Duty Truck Diesel Engine

Engine Builder
By Engine Builder

Some 1998-2003 E-Series, 1999-2003 Super Duty, 2000-’03 Excursion and
2000-’03 F-650/750 vehicles equipped with a 7.3L diesel engine may
exhibit an oil leak at the high-pressure oil pump outlet fittings
and/or end plug.

Related Articles

According
to Ford, this type of leak may appear to be a rear main crankshaft
seal, oil pan gasket or other engine oil leak due to the drain hole
machined in the crankcase valley which allows any oil in the valley to
run down the back of the engine (see Figure 1).

High-pressure
oil pump leaks at the outlet fittings and/or end plug can be serviced
without removing the pump assembly. Replace the

O-rings on the
fillings and the end plug using kit 2C3Z-9G804-AA. All three O-rings
should be replaced. Apply liquid thread sealer (included in the kit)
prior to reinstallation.

Note: Do not remove the bottom plug — it is sealed in a different manner.
Figure 1

You May Also Like

Tech Center

Crank Balancing Update

If there’s anything all of us in this industry have come to understand, it’s that you can never be certain someone else did the job correctly – and when it comes to crankshafts and crank kits that you or a customer might purchase, it’s imperative to ensure a proper balance job was performed and not just trust that it was because it says so.

Greg Jones
By Greg Jones

As performance, technology and ultimately horsepower have continued to increase over the years, engine builders have needed to evolve along with it. That means being able to control increased horsepower to create livable and workable horsepower. 

Obviously, pistons still go up and down and cranks go round and round, but the technology involved in the entire engine has allowed performance to reach new heights. All that increased horsepower has to go through the crankshaft – aka the heart of the engine. If that crank/heart is unhappy, everybody’s unhappy. Enter crankshaft balancing.

Read Full Article

More Tech Center Posts
EFI Timing Control & its Advantages

No one can overstate the fact that EFI timing control has radically changed the ability for anyone to fully, and correctly, optimize an ignition timing curve, assuming they are interested in investing the time.

By Andy Starr
Rebuilding Chevrolet’s Gen VI Big Block Engine

Following Chevy’s introduction of its popular small block V8 in 1955, the OEM needed something larger to power its medium-duty trucks and the heavier cars that were
on the drawing board at the time. Enter the big block!

By Engine Builder
Shop Solutions July 2023

Engine and machine shop tips and tricks.

By Evan Laux
Shop Solutions June 2023

Engine and machine shop tips and tricks.

By Shop Solutions – The Power of Knowledge

Other Posts

Pennzoil and API on Developing Motor Oil Standards

For more than 90 years, Pennzoil has worked alongside the American Petroleum Institute (API) to ensure Pennzoil products meet – and often exceed – the stringent requirements of motor oil specifications implemented to best help protect the performance of your engine. Related Articles – Nitrous Update – Heavy-Duty Diesel Engines, Equipment and Replacement Parts – Diesel Piston

By Engine Builder
Nitrous Update

The use of nitrous oxide in diesel engines is not a new concept. In fact, it has been used in drag racing for decades. However, it is only in recent years that it has gained widespread popularity in the worlds of diesel truck pulling and drag racing. Now, it seems as if almost everyone in the competitive scene is using it. 

By Evan Laux
Heavy-Duty Diesel Engines, Equipment and Replacement Parts

Relying on OE manufacturers like Caterpillar, Cummins, Detroit Diesel and Waukesha has always been an option, but diesel equipment owners are now more than ever seeking the aftermarket as a more viable solution for replacement parts.

By Evan Laux
Diesel Piston Technology

Diesel and heavy duty go hand-in-hand. There’s no way around it. High compression causes high cylinder temperatures, with peak cylinder pressure often as high as 2,700 psi (or higher). This high pressure and high heat only have one thing in mind, to beat relentlessly on the first thing to get in the way – the pistons.

By Eric Garbe