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Old 08-14-2013, 11:30 PM
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Exclamation Major Oil Leak

Hi guys i'm new to this site and to the hole diesel thing.. I just recently got a 1995 F-250 7.3L turbo. Everything was working great on it besides a small oil leak.. Last week I was driving and the cab started smoking so I pulled over and looked underneath and it was leaking oil like crazy by the started. I waited for about an hour on the side of the road and it stopped leaking and the dip stick still was full of oil, so I started it back up and drove about ten mile then the truck shut off and I rolled to the side of the road. looked underneath and it looked like a oil bath. I checked the oil and it was empty. Had it towed home and I just started taking it apart to look at it. I removed the fuel bowl and the valley was full of oil. Any ideas. Thanks
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Old 08-15-2013, 11:24 AM
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Welcome to the forum!

Many times if it is leaking that bad, it is in the High Pressure Oil System (which uses oil in the pan). A few places where it can leak into the valley:

1) The High Pressure Oil Pump (HPOP, behind/bolted to the rectangular reservoir on the front of the engine and down in the valley). Sometimes the rear cover plate will leak and there are a couple of plugs on it that can leak.

2) The Injection Pressure Regulator (IPR). Screws into the HPOP.

3) The HPOP hoses (one going to each head). The hose can fail, but more likely is the o-ring(s) that seal the hose fittings (they are separate items from the hoses) at the HPOP and at the heads. I had one at the HPOP fail and lost 8 quarts in 10 miles.

4) O-rings at the plugs on the heads (there are basically ports on each "cylinder position" that are plugged where the HPOP hose would go (see above). The Injection Control Pressure (ICP) sensor on the front port driver's side also has an o-ring.

You could also have leaks in other spots, but I would check those first. Use only Viton o-rings (not Buna-N) for replacements. Diesel O-Rings.com is a good place to get them. Cheers!
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Old 08-15-2013, 05:48 PM
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Thanks for the info. This is what I did so far. I removed the hpop and replaced the orings. Cleaned everything up and put it back together. I refilled the hpop resivoir and primed the fuel. I go to start it to see if it still leaking and she won't turn over. Not sure what's wrong.
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Old 08-16-2013, 06:31 AM
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Do you mean it is cranking, but not starting or not even turning over with the starter? If its the former, realize that if you opened the HPOP system, it will take some time for the air to get out of the system and get enough pressure to start. Make sure that you plugged the IPR back in (it gets overlooked a lot). Also you need to make sure the HPOP gear is on the shaft correctly and torqued. Cheers!
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Old 08-16-2013, 05:14 PM
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Ok thanks so I filled the hpop and tried starting it again and still the same. So I removed the fuel bowl and hpop again. I removed the "IPR" and I didn't see the ball behind the rod. So I removed the non-serviceable plug and I seen the ball then it went into the pump and I don't see it anymore. I can't get it out. Do I need a new hpop or can I just replace the ball and put it back together? Thanks for all the info so far. You guys are a big help.
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Old 08-17-2013, 03:56 PM
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Ok so I found a use hpop for $250 but not sure if I shod buy one if mine can be fixed. What do you guys think ?
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Old 08-17-2013, 05:38 PM
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Go to the Sawmpsdiesel web site and under the FAQs section are instructions on how to test your HPOP on a 7.3. Check it out before spending.
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