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Rear Main Seal Problem 2002 7.3

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Old 06-22-2010, 12:59 PM
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Rear Main Seal Problem 2002 7.3

Looks like I have a bad rear main seal on my 2002 F250 7.3 127,000 mi. Leaking quite a bit of oil. Over a qt low now. I can't get it up on a lift to really see very well until tomorrow. Oil looks like it is coming down behind the oil pan. None on pan itself. Any idea what else might be leaking up there? How much am I looking at to get this rear main replaced at a shop or at Ford?? Thanks
...jim
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Old 06-22-2010, 01:30 PM
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Don't panic yet. Get up on top of the motor. Is there oil in the valley? I've had 2 oring on the HPOP let go and the oil runs out the rear of the valley and looks like it's coming from the rear main. Easy fix, and super cheap if you can find the viton orings somewhere other than your dealer. The fittings that leaked on mine are (as looking from the front of the truck) on the right side of the HPOP down low.
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Old 06-22-2010, 01:55 PM
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Thanks, I will go look here shortly and see what I can see. Hard to get up there to see anything easily.
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Old 06-22-2010, 02:08 PM
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Get a mirror, (dental ones are great) and snoop around up top. That's where your leak is most likely. You might have to spray some Simple Green in the valley, let it soak for a little bit and spray it off with low pressure garden hose. That would help you see where the leak is coming from. Here's a link to a repair kit and instructions are a PDF on the page.

Replacement O-rings for Ford Diesel Engines
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Old 06-22-2010, 02:16 PM
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The fellas have you headed in the right direction.
If it is not the HPOP and you only see oil down the back side of the engine / back of the valley, check your Turbo pedistal. There are 2 o-rings from the pedistal to engine, 2 from the turbo to the pedistal, and 2 on the EBPV solenoid on the front of the pedistal.
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Old 06-22-2010, 02:19 PM
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Like the others have said... it's either the turbo pedestal or an HPOP leak.

Rear mains on these engines rarely leak.
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Old 06-22-2010, 02:54 PM
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I think you guys are exactly right. The valley is full of oil. I can't see exactly where it is coming from yet, but it is from somewhere on top.
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Old 06-22-2010, 02:59 PM
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It can be a bear to find the exact spot, Like already said, clean it up good, take if for a short drive and have a good look. If it has oil towards the front of the engine, chances are it's coming from one of the HPO fittings and fairly simple to repair. Good time to give Bob at Diesel Orings a call and get some orings on the way. His kit will fix it all and you will have spares that you will most likely need in the future.
Good luck and keep up posted.
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Old 06-22-2010, 04:45 PM
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Thanks to all. I can see oil leaking out of the front discharge hose on the HPOP once the truck warms up. At least its not the main. I was a lil bit worried about that. You've all been a great help. Gotta get my baby fixed for a road trip to Montana in a couple months.
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Old 06-22-2010, 04:55 PM
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If you can see it leaking at idle, it will really be spraying at full throttle. Click the link in my sig and you will have you some by the end of the week.
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Old 06-22-2010, 04:59 PM
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Where are you in Virginia? If you do the job, I'd like to lend a hand. I think I'll have to be doing it to mine sooner rather than later.
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Old 06-24-2010, 11:16 PM
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Just an update. I got my F250 fixed today. I wimped out and took it to the Ford dealer and had them install the Ford o-ring kit in the HPOP. They charged $166 to do the fix. Thought it wasn't worth my time to do it myself for that price. Everything seems good. Thanks for everyone's help. ....jim
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Old 06-25-2010, 08:40 AM
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Thanks for the update. $166 isn't too bad of a charge.
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Old 05-28-2011, 01:23 AM
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I have the same problem I think, went to dealer they told me it could cost around a thousand dollars or more , Does that sound right? Thanks
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Old 05-28-2011, 03:59 AM
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Sounds like they want to replace the whole HPOP for that price. If it is in fact the same problem as the OP, a few o-rings is all you'll need and a few hours depending on how good you are with repairs.
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