1999 7.3 rear main leak, I think. Need help ASAP - Ford Powerstroke Diesel Forum
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Old 01-28-2010, 05:41 PM
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1999 7.3 rear main leak, I think. Need help ASAP

Hey all. I have a 1999 F250 4x4 7.3 TD with an auto trans & 160K miles. I browsed some topics through the search function but didn't find the answers I was looking for. I have had a slight engine oil leak at the rear of the engine coming from what I thought was the RH valve cover gasket, for a few weeks now. Just a drop here & there. This morning I had a large puddle under the truck. The RH rear of the engine is somewhat wet, the RH valve cover is wet front to back (not all that fresh looking though), & oil is now pouring out from the trans inspection cover under the torque converter. 15 minutes = a 12" puddle. I have a bud who owns a general repair shop take a look at it today & he stated it's not the valve cover, but the rear main or "the large plug on the rear of the RH head with an internal hex". Long story short, this is my work truck (mobile welding rig) & I have a huge structural job starting Monday which I have to have it up & running for. What tips can you give me in tackling this myself? Is there anything else I should do while the trans is out as preventative maintenance? Are there any special tools I need? I've pulled many transmissions in the past, but a little nervous about this one, being a novice. I can turn/mill/fab/weld just about any tool I may need within reason for the short amount of time I have to complete this task. Please throw me some suggestions to aid in my efficiency this weekend. I would rather drop it off & have it done @ a repair shop, but on such short notice, nobody can get to it in time. Unless there is a Ford tech in Sacramento that wants a side job this weekend. Thanks, Bill.
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Old 01-28-2010, 06:06 PM
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The large internal hex plug is a plug for your high pressure oil rail, I belive that they have an O-ring to seal them that ford sells and is not that expensive, someone correct me if i'm wrong. If thats what is leaking then it won't require you to remove the transmission. Prity straight forward, but the uppipe might be in the way, so It may be difficult.
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Old 01-28-2010, 09:43 PM
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OK, I did a Google search & found a few things such as oil pump seals & turbo pedestal seals to be more common problems than rear mains. I'll keep my fingers crossed that is the issue. I read somewhere that there a "weep hole" in the valley cover that allows oil to drain directly into the bellhousing & may appear to be a rear main seal issue? Can anyone confirm this please? Thanks.
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Old 01-29-2010, 06:37 AM
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Drove it to work this morning & checked it when I stopped. Gushing oil & front top of the engine (near oil pump/fuel filter is soaked & lots of oil on valley cover. Prolly the oil pump seals? Looks mostly dry under turbo.
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Old 01-29-2010, 06:47 AM
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Sounds like the high pressure oil line orings under the base of the fuel filter housing where the oil lines connect to the HP oil pump or the engine block . Blew 2 sets of them on my way to the Carolinas this past summer, need I say they really make a mess... Anyhow you can pick up a kit at your local Ford stealer. The part number is 2C3Z-9G804-AB. I keep an extra set in my truck now because I have blown 3 sets in the last 2 years.
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Old 01-29-2010, 06:48 AM
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had the same thing happen to me... i thought it was the rear main seal but ended up being the HPOP O-rings, thank god! it only cost me around $10, and 30 minutes of my time good luck.
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Old 01-30-2010, 06:58 AM
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So it was the oil line fitting seals! WOOHOO! I got to sleep in this morning instead of bathing in tranny fluid! I steamed the engine yesterday & had a friend fire it up. In about 3 seconds, it dropped about 1/2 oz of oil. I went to the dealer & picked up the fittings. The parts guy was super cool & gave me wholesale pricing just because. I asked a service advisor if he could give me some pointers on replacing these & he had a tech come up from the shop who showed me exactly how. He even let me borrow his quick disconnect tool. First class customer service. All is well & the truck isn't puking oil anymore! Thanks for the help fellas! It's gonna be a good weekend afterall. Bill.
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