99 & up 7.3L Power Stroke Engine and DrivetrainDiscussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.
Was curious, what would happen if you didn't add back one of the three quarts of oil. Would the hpop resevoir fill up with the crank case oil, or would it remain low? Seems reasonable that if it is low and the crank fills it up, that then, infact, the oil does mix between the injection system and the crank case.
The LPOP is constantly filling that reservoir and anything extra runs back down into the crank case. There is a overflow at the top of the reservoir where it bleeds back down to the crank case.
The oil has to get back down to the crank case. Not only is it going through the injectors and down to the pan. But the IPR Is also constantly sending oil back down .... The IPR flows a lot of oil...
The LPOP is constantly filling that reservoir and anything extra runs back down into the crank case. There is a overflow at the top of the reservoir where it bleeds back down to the crank case.
The oil has to get back down to the crank case. Not only is it going through the injectors and down to the pan. But the IPR Is also constantly sending oil back down .... The IPR flows a lot of oil...
And yet the oil in my truck taken from the two different sites 250 miles after the oil change were completely different colors, indicating that they had not mixed 250 miles after the oil change.
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1999 7.3 F-350 and 2004 6.0 Excursion
Truck: Tymar type intake, Zoo Dad, muffler delete, By-pass coolant filter, Dahl 100 fuel filter Harpoon & Hutch mod, upgrade to 3/8" fuel line and HP oil X-over, Oil by-pass, Scan gauge II.
The LPOP is constantly filling that reservoir and anything extra runs back down into the crank case. There is a overflow at the top of the reservoir where it bleeds back down to the crank case.
No, there's no overflow from the HPOP reservoir. It's pressurized by the LPOP. The only outlets are thru the injectors or via the IPR, and I believe that goes back into the reservoir (could be wrong on that).
If you don't believe me about there being no overflow, try cranking the engine with the oil pressure switch removed from the top of the reservoir.
I drilled and tapped the small "U" shaped portion in the top of the reservoir. It is where the oil comes back to the crankcase? That is where my IPR dump off from the dual pumps goes... It is just barely recessed down from the top of the reservoir... so I think it cycles back to the crank case...
You may be right about the IPR dumping back to the crankcase. I'll have to go take a look a my buddy's place at his torn-down engine to be sure about it. I don't think you can tell by looking from the reservoir cover.
I just changed my HPOP oil today after having switched over to Synthetic oil a week or two ago and about 200 miles or better.
I wanted to make sure my injectors were getting the Synthetic for cold winter starts and I too had watched this guys video's and he sounded like he knew what he was talking about.
The 12 ounces looked a lot darker in the pan I put the HPOP oil in.
I put my finger in it and it was the same as the dip stick oil.
Honey and honey.
He is wrong.
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Bumper to bumper, Full Synthetic!!! Rotella T 5-40(7.3L) -- Mobil 1 Mercon V(E40D) -- Amsoil Extreme 75-90(Danas 60) -- Detroit Lakes, Minnesota -- "Boating has always been a rich mans hobby". -- 1996 E350 XLT Club Wagon 15 Passenger Van. -- Purchased 10-21-2009 for $700 cash with 620,000 miles on it! -- It's mint and beautiful! -- I love it! -- I am 64 years old and a professional mechanic and truck driver for over 45 years. --I am now a rich man driving a $50,000 prime time Ford that gets 21 MPG(HWY) & 16 MPG(Town).
You may be right about the IPR dumping back to the crankcase. I'll have to go take a look a my buddy's place at his torn-down engine to be sure about it. I don't think you can tell by looking from the reservoir cover.
That drain down to the crank case is either for the IPR or the bleedoff for the pump? I am starting to second guess myself... It extends all the way to the top of the reservoir...
I think the HPOP reservoir has to have an overflow tube. Think about it Kevin, 40-50 lbs of oil pressure in there all the time wouldn't be a good thing, would it? I think it stays within 1/2" because of the tube. I don't know how the IPR dumps exactly, it dumps back into the HPOP. So maybe it just releases the pressure to the heads, (Regulating the pressure, as it does) but it dumps back into the low pressure area before the swash plates in the HPOP?
Just a guess, I can find out exactly for sure, if I can call someone.
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Jim T.*48* SLAPS Co-Founder, 30.8 yrs RETIRED UAW 6/01/06, Now an ART (Specialists Flight Chief) with the USAFR 414th MXS Seymour Johnson AFB. My pics!'03 Dually pics!, New truck, 2011 F-350 SRW LB CC. White Platinum Lariat! 4x4
when i changed my hpop oil i was a qt low on the stick as i was filling the hpop up i thought to my self that i had put more then 1 qt back in. pulled the stick and found that i was no longer qt low. i did this without running the engine.
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a man is only as good as his word
2000 f250, 4x4, PSD, auto, XC, LB bradford built flatbed, edge juice with attitude, 4"BANKS exhaust with BANKS jake brake, BANKS Trans command, BANKS big head wastgate, BANKS turbine housing, BANKS intercooler, k&n air filter kit,ATS ported shroud compressor housing with WW, CFM+ intake manifold,AIH delete,ITP overboost annihilator
1983 f250 6.9, STC, 4X4, 5 speed, LB bradford built flatbed,with BANKS sidewinder turbo kit, BANKS 4" exhaust injectors set at 2150psi
Well the only advantage i'm starting to realize is that right after an oil change, you'll get maybe one additional old quart of oil out? I'm thinking when you stick that suction tube down in there, it's bottoming out and grabbing some of the sludge that we all know sticks around at the bottom of any oil pan after an oil change. I do a lot of turbo vw motors, oil on the stick is clean as can be, but the bottom of the pan has a sludge on it where the stock oil filter sits. Maybe that's a theory? LOL
Khlansen..what else doyou think he is flat wrong on those videos? I am curious as to i watch them when i'm bored and haven't seen anything way out there..but i'm not a psd expert.
Since we're talking additives..what's the best oil/fuel additive for warm climate like me..nothing really under 25 degrees F. Thanks guys.
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2002 F350 Lariat CC SRW 4x4 LB , Shadow Gray, Edge 4.5" w/ dual bilsteins up front/ Toyo Open Country M/T 315-75-16. Stock Motor 7.3, dual alts / 3 guage pillar pod, Auto Meter/ 5" turbo back magnaflow exhaust w/Aeroturbine muffler & 6" Jardine tip/ Husky 24k 5th wheel / Air Lift Bags.
John Wood Transmission / DP tuner / 08' rear diff cover
when i changed my hpop oil i was a qt low on the stick as i was filling the hpop up i thought to my self that i had put more then 1 qt back in. pulled the stick and found that i was no longer qt low. i did this without running the engine.
Well, I don't know what your getting at? When you unnecessarily changed your HPOP oil your truck was a quart low on the stick? Had you changed your oil the normal way just before? Because if you don't start the truck, and siphon out the oil from the HPOP reservoir, it can't affect the level on the stick.... NO WAY NO HOW! If you had changed the oil in the normal manor before, then it just took a few minutes to settle to the pan,,, nothing unusual.
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Jim T.*48* SLAPS Co-Founder, 30.8 yrs RETIRED UAW 6/01/06, Now an ART (Specialists Flight Chief) with the USAFR 414th MXS Seymour Johnson AFB. My pics!'03 Dually pics!, New truck, 2011 F-350 SRW LB CC. White Platinum Lariat! 4x4
Apparently there are lots of owners that really don't understand how the low pressure and high pressure oil systems operate and relate. This info from the factory service manual should put this to rest.
Also the guy at Powerstroke help may not be an idiot but he is well on his way to becoming one!
As someone stated, if it makes you feel all warm and fuzzy to drain the reservoir, then do it!
Personally, I don't intend on ever doing it with a routine oil change
During initial start or cold start, the high-pressure oil pump receives unfiltered oil from the left side valve lifter oil gallery through the anti-drain back check ball valve. Once the engine starts or during warm engine starts, the check ball closes and the high-pressure oil pump receives filtered oil from the high-pressure oil pump reservoir. The high-pressure oil pump pumps the oil under extremely high pressures (4,115-20,577 kPa [600-3,000 psi]) through the left and right side high-pressure supply hoses to the high-pressure oil rails (integral to the cylinder heads). Once in the oil rail, the oil is fed to the fuel injector bores through four oil feed galleries drilled and machined in the cylinder head. The high-pressure oil then actuates the fuel injectors.
The lubrication system is comprised of a low-pressure system and a high-pressure system. The low-pressure system provides primary engine lubrication while the high-pressure system provides the hydraulic pressure required to actuate the fuel injectors.
The low-pressure lubricating system draws oil from the engine oil pan through the oil pump screen cover and tube into the oil inlet passage in the front cover. The gerotor oil pump then pumps the oil back out through the outlet passage in the front cover. The oil separates into two paths.
One flow path sends oil into the high-pressure pump reservoir initial fill gallery (integral to the cylinder block) and through the anti-drainback check ball. During cold start the oil feeds in two directions from the anti-drainback check ball. One feed leaves the check ball and enters the front cover. From there it enters the high-pressure oil reservoir. The second feed exits the check ball and enters the left bank valve lifter oil gallery.
After leaving the front cover outlet passage, the second oil path sends the oil through the oil cooler and filter assembly. Once inside the filter housing, the oil filter bypass valve may open to vent excess pressure and oil back into the oil pan. After the oil has been circulated through the oil filter, the oil feed then enters the main oil gallery (integral to the cylinder block). Once in the main oil gallery, the oil is routed to the five crankshaft main bearings through five drilled and machined feed galleries (integral to the cylinder block). The five camshaft bearings receive the oil feed through five vertically drilled and machined feed galleries connected to the main bearing feed galleries. The front main bearing feed gallery also supplies oil to the right bank valve lifter oil gallery through a vertically drilled and machined oil feed gallery (integral to the cylinder block). The rear main bearing oil feed gallery also supplies oil to the turbocharger assembly through a vertically drilled and machined oil feed gallery (integral to the cylinder block).
Pressurized oil entering the turbocharger assembly is utilized to actuate the exhaust back-pressure warm-up system. The oil drains back through the turbocharger mounting pedestal and back into the oil pan. The valve lifter oil gallery supplies pressurized oil to the valve tappets and to the piston cooling oil jets. Oil from the valve tappets is routed upward to the cylinder head valve train through hollow push rods. Once in the cylinder head, the oil drains back to the oil pan through return ports at each end of the cylinder head.
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Early '99 F250 SD, 4X4, SuperCab, Long Bed, 7.3L "PowerStroke" Diesel, Auto, PMT1 PCM w/DPTuner 80 tow, 190K miles,
Volant intake, ISSPRO gauges, BDS front leveling kit, 4" straight piped, Dick Cepek 18x9 DC1-Chrome, Nitto Terra Grappler 325/65R18,
Pro GOD, Pro Guns, Pro Life Important Notice, Pro Life changes when someone breaks in.
Thanks for posting those diagrams. There is sure a lot of 'discussion' regarding this.
I for one see no harm in it. But to do it every oil change would be AR. Maybe once a year perhaps.
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The Green Monster: 2001 F250 Powerstroke, 2WD, ZF6 transmission. Bully Dog GT Tuner set in tow mode. MotorSilk boric oxide added to engine, transmission and diff. Showing 30mpg on the freeway running home brew biodiesel. NTZ 1/2 Micron bypass oil filter. Dieselsite Coolant filter and Caterpillar ELC next on the list. 4" open turbo back exhaust.
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), AIS, 
It extends all the way to the top of the reservoir...
NO WAY NO HOW! If you had changed the oil in the normal manor before, then it just took a few minutes to settle to the pan,,, nothing unusual.
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