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Ford Truck Club Forum > FORD F-100 | F-150 SERIES > 1992-1996 Ford F150



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  #1  
Old May 15th, 2013, 09:58 AM
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cools cools is offline
 

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Question loosing oil pressure

replaced oil pump, main and rod bearings. as truck heats up(to normal op temp) oil pressure goes down, then it sounds like a bottom end knock develops. If I keep the rpm's up oil pressure stays up. Can anyone help?
  #2  
Old May 15th, 2013, 10:54 AM
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What year and engine?

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
  #3  
Old May 15th, 2013, 02:10 PM
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^^^that, and also how low is the oil pressure dropping? What are you using to check the pressure?


89 F-150 5.0l AOD 2x4, 3.55 LS(+4), Converted to HO Roller, 3g Alt, GT40Ps, Y-pipe, Rerouted PCV, Dual Taurus E-fans, Explorer Injectors, Remote ICM, DIY Cold air, Rubber Vacuum System, Tranny cooler, Remote Tranny filter, Saginaw P\S swap, F350 Brakes, more.


  #4  
Old May 15th, 2013, 02:24 PM
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Cools, i re read your first post concerning this. It seems the issue remains with the low oil pressure even after all you've done. The only other suggestion I have would either be:
1. Cam bearings
2. Oil galley plug
3. main or rod bearing cap distortion, ovaled out or warped.

Did you plastigauge the bearings upon installation?



1994 F150 XLT ExCab SB 306, 4R70w, 8.8 3.55 open, MSD StreetFire coil, Taylor Siro Pro wires, MSD cap and rotor, 1.72 Roller Rockers, 2º cam advance w/ Cloyes Street True Roller timing set, Flat top Hyperutectic pistons, Flowtech Long Tube headers, Xpipe, High flow Magnaflow converters, Spintech XL Sportsman DIDO muffler.

  #5  
Old May 15th, 2013, 02:59 PM
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Also, have you considered a complete rebuild? You may if the engine has high miles. Just my .02



1994 F150 XLT ExCab SB 306, 4R70w, 8.8 3.55 open, MSD StreetFire coil, Taylor Siro Pro wires, MSD cap and rotor, 1.72 Roller Rockers, 2º cam advance w/ Cloyes Street True Roller timing set, Flat top Hyperutectic pistons, Flowtech Long Tube headers, Xpipe, High flow Magnaflow converters, Spintech XL Sportsman DIDO muffler.

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Old May 15th, 2013, 04:09 PM
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all the above +
check to see how much oil is in it
it may have leaked out


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ASwaff400 , bigcreek , bikertrash3531 , Booba5185 , catmechanic07 , cools , glc , Hazzardousmat , JohnJ , JSoko , polargeek , Rage58201 , Russo2 , The Frankster

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