Question about 1997 Ford F350 Crew Cab

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No oil pressure knocking noise

Changed the oil, now there is no oil pressure and a knocking noise.

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  • Kenzie Stewart
    Kenzie Stewart Apr 15, 2014

    The engine is a 460 powerstroke. The oil filter was changed and then no pressure from the oil. Could it still be the oil sending unit? it's a ford f350

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  • Expert
  • 290 Answers

Bad oil pump but with knocking now there is a lot more damage internal

Posted on Apr 15, 2014

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Posted on Jan 02, 2017

Molson02536
  • 3854 Answers

SOURCE: oil pressure problem

You oil pressure sending unit has gone bad, it's common to go bad and some even leak oil. 
The oil pressure sensor is on the back of the block on the passenger side, you can get to it from the top and not from the bottom. There are (2) switches back there that screw in to the block and you can only see it from the top of the engine. The Oil Pressure Sending Unit is the one wire harness with a green and white strip on it. The other switch has more wires to it. 
When you pick up the new sensor, make sure you get the right one. make sure you get the Oil Pressure Sending Unit which sends variable oil pressure and has only one quick connect for the wire connector. The oil pressure switch is the one that only activates the oil light on older engine
Once you get the right part at Auto Zone for around $9.00, disconnect the wire clip with the green with white strip on it. and use a deep spark plug socket with a extension and u joint to get the sensor out. The sensor comes with teflon tape already and no oil should leak out from the block. It as simple as replacing a bolt and reconnecting the wire connector. 
Good luck and hope this helps, take no more then 10 min to do but about 5 hours for the engine to cool off LOL

Posted on May 29, 2009

samson-1
  • 153 Answers

SOURCE: ford focus turbo diesel low oil pressure with no knocks from engine

Possible oil sending unit problem.

Posted on Oct 24, 2008

csmock132
  • 4669 Answers

SOURCE: No oil Pressure, with knock.

The first thing I would do is change the oil filter. Also, what engine do you have.

Posted on May 27, 2009

  • 14036 Answers

SOURCE: no oil pressure on my 03 crown victoria

KNOCKING NOISE IS NOT A GOOD SIGN.SOUND IF YOUR ENGINE OIL LEVEL IS CORRECT NOT LOW. SOUND LIKE OIL PUMP AND MAIN BEARING FAILURE.YOU NEED A REBUILT ENGINE OR OVER HAUL.

Posted on Oct 18, 2009

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