Oil pressure drop

Discussion in 'Engine & Performance' started by Ramsey89, Jun 25, 2012.

  1. Ramsey89

    Ramsey89 Junior Member

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    My 351w has good oil pressure when cool but once at operating temp the factory oil gage in the dash drops to the low side, accelerate and it goes up til i let off. Is there any thing i should worry bout cause its not making and of the sound an engine makes with little or no oil pressure?
     
  2. Raevsky97

    Raevsky97 bagged 97 f150

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    has it been a while since u changed it? do you have proper weight in it?
     
  3. cowboy

    cowboy Sheriff Staff Member

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    Are you low on oil?
     
  4. TLSF150

    TLSF150 Full Access Member

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    Probably the main bearings getting wore out.. When the engine gets warm it expands a little which is why the pressure drops..
     
  5. Ramsey89

    Ramsey89 Junior Member

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    only 9k miles on it, fresh oil, changed the oil pump strainer. runs fine thinking on putting an after market gage on it and see what it does.
     
  6. ex4banger83

    ex4banger83 Safety 3rd

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    not a mechanic or anything, but maybe check the oil pressure sending unit...had a customer the other day with an 05 CTS-v :drool: and it was doing the same thing and he claimed that fixed it
     
  7. Raevsky97

    Raevsky97 bagged 97 f150

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    say the factory gauge should be attached to the sending unit and it can just end up being the gauge freaking
     
  8. Roush PSD Interceptor

    Roush PSD Interceptor Straight Piped Diesel Staff Member

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    I've seen people put a T-fitting on older engines at the
    sending unit port and have a mechanical gauge
    as well as the electrical sending unit.
     
  9. Ramsey89

    Ramsey89 Junior Member

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    i'll give that a try got a spare sending unit some wheres :signs8:
     
  10. AKBray907

    AKBray907 SUPER *********.

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    if i were you id run a T and get a cheap mechanical oil pressure gauge and also install your new sending unit. You might as well do it once since your gonna be in there anyways. those older trucks like that i like to think of the stock gauges as ballpark gauges, theyre never going to be as accurate as an aftermarket gauge

    btw, welcome man!!
     

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