No oil pressure after replacing oil cooler O-rings 2003 7.3L - Ford Powerstroke Diesel Forum
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Old 12-11-2013, 01:27 PM
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Exclamation No oil pressure after replacing oil cooler O-rings 2003 7.3L

I just replaced o-rings on oil cooler with a lot of help from this forum. I filled the truck with 15 qts oil and started it up. It started rough at first, I saw the oil pressure guage go up, then engine smoothed out but just a minute or two later I noticed the oil pressure guage go back to zero and the truck stalled. I looked all around and did not see any signs of oil leakage. I started the truck again but no oil pressure so I shut it down. I pulled the dipstick and there was not even any oil on it! I am afraid to run the truck now since I dont have pressure or even any oil on the dipstick. I am assuming the oil is in the coolant since its not on the ground. Is it possible for these O-rings to come out of position as you reassemble the cooler? Spent a lot of time on this and need truck to get back to work so any advice would be appreciated. I know I am going to have to take it back apart but sure dont want the same result twice. Outside of the oil leak, the truck ran fine before I pulled the cooler. Any help would be extremely appreciated. Thanks!

2003 F-350 7.3L 4x4
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Old 12-12-2013, 06:53 AM
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how does your coolant look? any oil get in there? I'm assuming there's not a huge puddle of oil under the truck right?

Last edited by nighthawk285; 12-12-2013 at 07:34 AM.
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Old 12-12-2013, 07:26 AM
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Fyi, your dipstick doesn't go to the bottom of the pan. So roughly 4 QTS low will show nothing on the dipstick. Did u refill the coolant before u restarted the engine? If u did, your coolant reservoir would overfill. If not then your oil is in your coolant system.
And yes, it is possible you "rolled" an O-ring when pressing the tube back into the housings.

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Old 12-12-2013, 11:04 AM
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finally got back to work on the beast and yes the oil is in the coolant. I removed the block coolant plug and out it came. Now to figure out why.
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Old 12-12-2013, 02:44 PM
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pulled out the cooler and the front black o-ring had rolled up over the lip of the cooler. Was pinched so I got another one. No the darn thing wont start. Just cranks and cranks. Frustated and quitting for the day.
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Old 12-12-2013, 02:46 PM
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with it running out of oil, it'll take awhile to build pressure up enough to fire the injectors again......get a charger on it to keep your batts up and keep cranking. It'll fire.
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Old 12-12-2013, 03:30 PM
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Thanks Nick. I'll sleep better tonight knowing that. Will tackle it again in the am.
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Old 12-14-2013, 07:25 AM
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Checked oil level in HPOP. Was low so I filled it. After a little more cranking it fired right up. And best of all no leaks! So I'll flush the cooling system real good and put it back together. I truly want to thank everyone who gave advice on this thread. It was my first 'major' repair attempt and could not have done it without the help I got on this forum.
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Old 12-14-2013, 07:43 AM
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Sure thing. Wish they were all as easy to fix as yours. Lol

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Old 12-14-2013, 09:42 AM
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Quote:
Originally Posted by hucorey View Post
Sure thing. Wish they were all as easy to fix as yours. Lol

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Ha! I second that! Glad to hear she's up and running!
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