ticking sound from top of engine
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Thread: ticking sound from top of engine

  1. #1
    FRESHMAN ROVER
    Join Date
    February 5th, 2012
    Location
    medford new york
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    29

    ticking sound from top of engine

    I have a 1999 P38 4.0 with 150 K miles.I have owned it for the last 4k miles.
    I had a loud ticking sound from the top of the engine and my low oil light came on about
    3k miles ago.My mechanic felt that the oil was not getting to the top of the engine and that was the cause of the ticking sound.
    he flushed the engine and replaced the oil.
    The sound went away for the next 3K miles.
    I had an oil change last week and after driving about 10 miles the same thing happenned.
    The oil light came on and the ticking sound came back.
    my mechanic flushes the engine again and this time replaced with synthetic oil.
    He feels that either the oil pump screen or pickup tube gets clogged.
    Why would this happen with new oil?[too thick?]
    will the synyhetic oil work or do i need anew oil pump.
    if so how big a job is a new oil pump?

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  3. #2
    LEGACY VENDOR leftlanetruckin's Avatar
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    August 26th, 2007
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    mid missouri, usa via blackpool,lancs...
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    Re: ticking sound from top of engine

    Synthetic oil in an ancient pushrod V8. Funny, especially considering what it was used for (Quieten it down).
    Get a new "Mechanic". One who will actually look for what the problem is, and stop guessing.
    New oil pump is the front cover, but your "mechanic" should actually get off his rear and check for oil pressure first, which is what he should have done before.

    Martin
    '98 P38 HSE, with a 325hp built Chevy 5.3l LSx motor and transmission, fully functional EAS, HVAC etc.
    '03 L322 HSE Bone stock, besides XM.
    '98 XJ Locked, geared, plated and on 37's.
    Custom fabrication, engine rebuilds and knowledge that comes from experience and not Google, always available for a reasonable cost.
    Reliable BECM repairs, and EAS Parts....www.becmdoctor.com

  4. #3
    SOLIHULL ROVER
    Join Date
    June 13th, 2006
    Location
    Kuala Lumpur
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    1,719

    Re: ticking sound from top of engine

    Hi

    Flickering oil light means low oil pressure. The cause can be wrong oil and the oil gets too thin. Use thicker oil.
    It can also be caused by the pressure relief valve being full of sludge causing it to stay open.
    Servicing the pressure relief valves will solve the problem.
    Worn main bearings can also be the reason. This will cause more of the oil to leak from the side of the bearings then designed and result in too low oil pressure.
    There is also the possibility of dirty pick up screen and problems with the oil pump. There are some posts on here with members that had broken gears of the pump and debris inside the oil system.

    Check the oil type and the pressure relief valves first before tearing the motor apart.

    Regards

    Jos

  5. #4
    LEGACY VENDOR leftlanetruckin's Avatar
    Join Date
    August 26th, 2007
    Location
    mid missouri, usa via blackpool,lancs...
    Posts
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    Re: ticking sound from top of engine

    Or, just check oil pressure...
    Before fighting with possibly stuck/seized relief valves, put a gauge on the thing.

    Martin
    '98 P38 HSE, with a 325hp built Chevy 5.3l LSx motor and transmission, fully functional EAS, HVAC etc.
    '03 L322 HSE Bone stock, besides XM.
    '98 XJ Locked, geared, plated and on 37's.
    Custom fabrication, engine rebuilds and knowledge that comes from experience and not Google, always available for a reasonable cost.
    Reliable BECM repairs, and EAS Parts....www.becmdoctor.com

  6. #5
    SOPHOMORE ROVER
    Join Date
    December 25th, 2010
    Location
    Yucca Valley, Ca
    Posts
    411

    Re: ticking sound from top of engine

    Make sure the quick lube guys are using a good quality 10w40 oil and decent oil filter, they often look up what weight of oil to use and just pour it in without realizing that the oil specified in the guide is for newish engines and not 100k plus mileage engines! Like Martin said, this is a pushrods overhead valve engine designed about fifty years ago!
    2001 HSE Epsom green

  7. #6
    FRESHMAN ROVER
    Join Date
    February 5th, 2012
    Location
    medford new york
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    29

    Re: ticking sound from top of engine

    Where is the pressure relief valve and is it easily replaved?

  8. #7
    SOLIHULL ROVER
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    June 13th, 2006
    Location
    Kuala Lumpur
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    Re: ticking sound from top of engine

    Hi

    There are two of these fitted. One is under the pressure switch the other one is fitted lower.
    With the oil filter removed you can see them.

    Check out the post:
    Low Oil Pressure, Clean pick up tube screen?

    Regards

    Jos


  9. #8
    FRESHMAN ROVER
    Join Date
    April 7th, 2013
    Location
    los angeles
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    34

    Re: ticking sound from top of engine

    Quote Originally Posted by leftlanetruckin View Post
    Or, just check oil pressure...
    Before fighting with possibly stuck/seized relief valves, put a gauge on the thing.

    Martin
    Start here. Oil Pressure will give you lotsa info.

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