How to change lpop in 7.3 - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion 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.

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Old 06-16-2010, 11:10 PM   #1 (permalink)
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How to change lpop in 7.3

I have an 02 f550 7.3 and want to change lpop. Does anyone have any instructions or diagrams.

Thanks
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Early 99 7.3 PSD, Reg Cab Long Box, 4" Straight Pipe, A Pillar Quad Pod, Pyro - Boost - Trans Temp - Diff Temp, DP High Idle-40-60-80-100, 5000lbs Rear Air Bags, 5000lbs Front Air Bags, 4000lbs Dump Box Kit (Factory Box), 8'2 Boss V-XT

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Old 06-16-2010, 11:41 PM   #2 (permalink)
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I have an 02 f550 7.3 and want to change lpop. Does anyone have any instructions or diagrams.

Thanks
What kind of shape is the front cover in?
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Old 06-17-2010, 07:11 AM   #3 (permalink)
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Set comes with pump, haste, and front cover.
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2002 F-550 Fontaine, Custom Fiberglass Box, 35,000 Lb Goose Neck, A Pillar Quad Pod, Pyro, Boost, Fuel Pressure, DP Switch, DP High Idle, 40 Tow, Jake, 60 Tow, 80 Econo, 140 Smoke, 19.5" Alcoa, F150 Flareside Euro Tail Lights, 8'2 Boss V-XT
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Old 06-17-2010, 07:24 AM   #4 (permalink)
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He means the engine front cover and if it is scored badly, a new lpop isn't going to help.
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Old 06-17-2010, 03:43 PM   #5 (permalink)
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You'll have to pull the LPOP to inspect the front cover anyway.

Here's the procedure:

Pull fan off the water pump and remove fan and shroud together.
Remove center bolt from Harmonic Balancer (crank pulley) and pull balancer with appropriate puller.
Unbolt LPOP cover and remove LPOP cover and rotors.

Then you'll be able to see the surface on the front cover that the rotors run against. If it's badly scored, you may need to replace the front cover. The LPOP on these engines is pretty much indestructable, but the weak point is the aluminum front cover that the steel rotors wear against.

You didn't say why you're wanting to change the LPOP. If you're having issues with oil delivery, the problem may be a cracked oil pickup tube in the oil pan. The engine will have to come out to fix that if it's the problem.
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Old 06-17-2010, 06:36 PM   #6 (permalink)
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I am changing it because I suspect that it is not getting enough oil to hpop. Changed ipr icp cps 8 injectors and still get icp 500 psi, ipr maxed out 65% and throttle of only 2000 rpm at 450 psi icp.
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2002 F-550 Fontaine, Custom Fiberglass Box, 35,000 Lb Goose Neck, A Pillar Quad Pod, Pyro, Boost, Fuel Pressure, DP Switch, DP High Idle, 40 Tow, Jake, 60 Tow, 80 Econo, 140 Smoke, 19.5" Alcoa, F150 Flareside Euro Tail Lights, 8'2 Boss V-XT
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Old 06-17-2010, 09:17 PM   #7 (permalink)
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Did you ever check the op with a real gauge? There is an 1/8 npt port at the back of the block on the driver side.



EDIT-On the trucks I think there is one on the filter housing as well.
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Old 06-17-2010, 09:30 PM   #8 (permalink)
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I am changing it because I suspect that it is not getting enough oil to hpop. Changed ipr icp cps 8 injectors and still get icp 500 psi, ipr maxed out 65% and throttle of only 2000 rpm at 450 psi icp.
You're gonna have a new truck soon, changing all those parts.

Try the test for oil aeration. What you do is overfill the crankcase by a few quarts, jack up both rear wheels till till they're about 3' above the ground and start it up. What that does is fully submerge the oil pickup tube, covering a potential crack in the tube that may be letting air into the oil.

The HPOP hates aerated oil.

One more thing - Have you checked your dipstick?
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Old 06-18-2010, 11:12 PM   #9 (permalink)
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Talking

I have done the Jack up test. None of my jacks would lift the back of the truck. Bobcats wouldn't lift either. So buddy came over with crane and lifted it, no good. Problem is not pickup tube. I tore down the lpop today and found the problem. Truck never seem to have the right amount of power and sometimes the oil pressure for engine wouldn't build up as fast as it should on cranking.

So I tore it down today and found that the rotors had some major damage on it. There was a gouge out of it and some MAJOR scoring in timing cover. Ford wants $875 for new cover and I found one used that I would have to pull out of the truck to find that it may or may not be good. I searched some more and found a cover for $65. New pump gasket and cover $250.

Thanks for help, hope this works.
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2002 F-550 Fontaine, Custom Fiberglass Box, 35,000 Lb Goose Neck, A Pillar Quad Pod, Pyro, Boost, Fuel Pressure, DP Switch, DP High Idle, 40 Tow, Jake, 60 Tow, 80 Econo, 140 Smoke, 19.5" Alcoa, F150 Flareside Euro Tail Lights, 8'2 Boss V-XT
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Old 06-18-2010, 11:19 PM   #10 (permalink)
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Need some guidance on changing front cover tho.
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2002 F-550 Fontaine, Custom Fiberglass Box, 35,000 Lb Goose Neck, A Pillar Quad Pod, Pyro, Boost, Fuel Pressure, DP Switch, DP High Idle, 40 Tow, Jake, 60 Tow, 80 Econo, 140 Smoke, 19.5" Alcoa, F150 Flareside Euro Tail Lights, 8'2 Boss V-XT
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Old 06-19-2010, 02:28 PM   #11 (permalink)
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Is there any special trick to changing the front cover?
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Early 99 7.3 PSD, Reg Cab Long Box, 4" Straight Pipe, A Pillar Quad Pod, Pyro - Boost - Trans Temp - Diff Temp, DP High Idle-40-60-80-100, 5000lbs Rear Air Bags, 5000lbs Front Air Bags, 4000lbs Dump Box Kit (Factory Box), 8'2 Boss V-XT

2002 F-550 Fontaine, Custom Fiberglass Box, 35,000 Lb Goose Neck, A Pillar Quad Pod, Pyro, Boost, Fuel Pressure, DP Switch, DP High Idle, 40 Tow, Jake, 60 Tow, 80 Econo, 140 Smoke, 19.5" Alcoa, F150 Flareside Euro Tail Lights, 8'2 Boss V-XT
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Old 06-19-2010, 11:58 PM   #12 (permalink)
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Is there any special trick to changing the front cover?
It just bolts on. The alternator and AC brackets will have to come off to get to some of the bolts. Also, there are a couple of pan bolts that go into the front cover.

The front cover should be installed before the pan, and of course the engine shoudl be out of the truck t do the work.
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99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version), AIS, coolant filter w/"hokum" bracket, regulated return, heated mirror mod, lighted cupholder, Marinco heater plug-in.

Hard or no-start? Check Here
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Old 06-20-2010, 11:59 AM   #13 (permalink)
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Guys said that it can be done in the truck by loosening the motor mounts and lifting the front of the motor to access the pan and the pickup bolts?
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Early 99 7.3 PSD, Reg Cab Long Box, 4" Straight Pipe, A Pillar Quad Pod, Pyro - Boost - Trans Temp - Diff Temp, DP High Idle-40-60-80-100, 5000lbs Rear Air Bags, 5000lbs Front Air Bags, 4000lbs Dump Box Kit (Factory Box), 8'2 Boss V-XT

2002 F-550 Fontaine, Custom Fiberglass Box, 35,000 Lb Goose Neck, A Pillar Quad Pod, Pyro, Boost, Fuel Pressure, DP Switch, DP High Idle, 40 Tow, Jake, 60 Tow, 80 Econo, 140 Smoke, 19.5" Alcoa, F150 Flareside Euro Tail Lights, 8'2 Boss V-XT
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