Hidden Oil Leak - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 09-05-2013, 10:13 AM Thread Starter
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Hidden Oil Leak

I have an 02,F-450 6 speed, with 80,000 miles. I'm the original owner.
It has started to leak motor oil at the back of the motor. It leaks like the rear main, but I dont think it is. It only does it when I have a load behind it, and its been pulling for a while. When it starts to leak it really puts it down ! Unhooked the trailer and put it in the shop. Couldent find a leak wile it was on the racks. Took a load of horses about 100 miles , and by the time I got unloaded it was rolling. Looked like a blood trail from a lung shot Elk.
Bobtail into town 30 miles or so, and not a drop will be leaked. Got me scratching my head.
Any Ideas as to what would leak when it gets warmed up good ?
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post #2 of 6 Old 09-05-2013, 12:37 PM
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Most common areas would be the O rings and the ends of the HPO lines at each head. But why it is doing it only when a load is behind it is what doesn't make sense to me. Do you have gauges? What kind of boost are you pulling? Look at the pedestal O Rings where the turbo mounts as well, oil should leave a trail behind. Auto Parts stores sell a UV dye that you put in the oil and then use a black light and the trail will glow like magic!!!

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post #3 of 6 Old 09-05-2013, 12:47 PM
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There are a few common spots on top of the motor that will leak into the valley and run down a weep hole to the rear. Check around the turbo, there are two orings between the turbo and the pedestal, another two between the pedestal and the block. Also check the HPOP toward the front of the motor in the valley. It can leak where it mounts to the motor, around it's plug or at either of the two hoses coming out of it.

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post #4 of 6 Old 09-05-2013, 04:26 PM Thread Starter
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NC, Not sure what kind of gauges you are refering to. Every thing is stock. Not sure what you mean by 'Boost". Only leaking under load has all of us puzzled. I will try to locate that dye ! Sounds like that could sure help locate the problem.
J, I looked and there is a bit of oil in the valley. Not much but some. I will allso look for a better mechanic !!! Thanks for the tips !!!
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post #5 of 6 Old 09-05-2013, 06:53 PM
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It could possibly be the HPOP Mounting gasket. I've seen a few of those leak. Everybody freaks out and thinks its the RMS, but it's very misleading. I did the same thing and was about to pull my engine when somebody talked sense into me.

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post #6 of 6 Old 09-06-2013, 05:20 AM
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I would say an high pressure oil line either at the hpop or head. Increasing load equals increased throttle equals increased hpop pressures. Just my guess
If it where mine I would clean valley and back of motor let dry completely hook a load up and follow the oil.

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