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  1. #1
    Join Date
    Apr 2009
    Location
    Keiraville, NSW
    Posts
    959

    Oil Pump Replacement

    Oil pump is probably on its way out (390k). Check Oil, especially with a cold engine is becoming prevalent. Service agent is not a Holden specialist. Some state engine out, others state leave engine in but crossmember out.

    Advice please as to which way to go. Basically a stock standard WK.
    After market or OEM pump?
    Thank you.

  2. #2
    Join Date
    Nov 2013
    Posts
    658
    Quote Originally Posted by grange250 View Post
    Oil pump is probably on its way out (390k). Check Oil, especially with a cold engine is becoming prevalent. Service agent is not a Holden specialist. Some state engine out, others state leave engine in but crossmember out.

    Advice please as to which way to go. Basically a stock standard WK.
    After market or OEM pump?
    Thank you.
    I would be getting the car tested & diagnosed first by a reputable workshop.
    At 390,000 km's an engine overhaul would be on the cards.

    But, first things first, test oil pressure, hot & at normal operating temp, at idle & at approx 2500rpm
    using a gauge - any decent workshop will be able to do this for you..

    Make sure it's not just a dodgy oil switch...

    Good luck.......
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  3. #3
    Join Date
    Jan 2004
    Location
    Perth, WA
    Posts
    7,244
    As said, check the actual pressure first and at 390k, if you pull it down to change the pump, you may get a few nasty surprises. I would tread carefully when you get them to replace the pump, may work out cheaper to buy a crate motor or even a low km one and swap it out.

    Melling are good aftermarket pumps if you decide to replace it.

  4. #4
    Join Date
    Jan 2011
    Location
    Perth
    Posts
    502
    Low oil pressure generally happens once oil gets hot and thins out...not when cold and oil is thicker

  5. #5
    Join Date
    Nov 2013
    Posts
    658
    Quote Originally Posted by Eors View Post
    Low oil pressure generally happens once oil gets hot and thins out...not when cold and oil is thicker
    When I'm doing a diag I want all the answers - Cold oil pressure test is a must.

    Think blocked oil pick up - when cold, the thicker oil struggles to get through..
    Some pumps you can actually hear it when pickup blocked.

    The OP has complained about "check oil" warning coming on - nothing about oil pressure???

    I've lost count how many oil pressure switches I've fitted over the years on 5.7's..
    GTSR HERON WHITE MANUAL build # 0068
    VK HDT Calais Director Build # 2107
    2010 VE SSV SPECIAL EDITION

  6. #6
    Join Date
    Apr 2009
    Location
    Keiraville, NSW
    Posts
    959
    My apologies - A switch has been replaced. The Grange does not have an oil pressure gauge as standard but the shop was talking about a temporary fit somehow. Since the switch was replaced (at 390 service), the check oil has appeared more frequently until it is running for a while. Certainly could be a sludge blockage. Agent has said that a sludge cleaner can cause more damage to an ageing pump. Oil pump is original. Engine has otherwise checked out well apart from one lifter that is a little noisier than it should be.
    Engine was mentioned but i'm hoping to get away with an outlay of fewer dollars.

  7. #7
    Join Date
    Apr 2009
    Location
    Keiraville, NSW
    Posts
    959
    We now consider a blocked oil pick-up, as TPKW30 suggested.
    Any thoughts as to a brand of oil system cleaner/flusher being better than another or are they basically the same substance, just under different pay more Labels?
    Shop is suggesting we do the clean twice. It has not been done before.
    Thank you

  8. #8
    Join Date
    Apr 2009
    Location
    Keiraville, NSW
    Posts
    959

    Oil Pump Replacement

    We now consider a blocked oil pick-up, as TPKW30 suggested.
    Any thoughts as to a brand of oil system cleaner/flusher being better than another or are they basically the same substance, just under different pay more Labels?
    Shop is suggesting we do the clean twice. It has not been done before.
    Thank you

  9. #9
    Join Date
    Nov 2013
    Posts
    658
    Quote Originally Posted by grange250 View Post
    We now consider a blocked oil pick-up, as TPKW30 suggested.
    Any thoughts as to a brand of oil system cleaner/flusher being better than another or are they basically the same substance, just under different pay more Labels?
    Shop is suggesting we do the clean twice. It has not been done before.
    Thank you
    Get the shop to remove the sump plug & drain the oil.
    Once the oil stops running out get them to stick a borescope camera into the drain hole.
    (I cant remember how close the pick up is to the drain hole)
    Anyway, they may be able to see the pickup.
    If they can, get the extension nozzle from a can off WD40 & put it onto a can of carby cleaner.
    Spray the pickup with carby cleaner & it should clean most of the gunk off.

    If you cant see the pickup with the borescope, your only option will be to to remove sump
    to access pick up & then clean.

    If you want to try the "engine flush" route I would drain approx 3 litres of engine oil - add 2.5 litres diesel fuel, and 2 bottles of any reputable brand oil flush (Wynns, Liquid Molley etc)
    I would let the engine idle for at least one hour.
    Do not drive the car or rev it hard during the time the diesel is in the sump.

    Good luck.
    GTSR HERON WHITE MANUAL build # 0068
    VK HDT Calais Director Build # 2107
    2010 VE SSV SPECIAL EDITION

  10. #10
    Join Date
    Jan 2004
    Location
    Perth, WA
    Posts
    7,244
    Good tactic with the borescope and nozzle. Ideally you want to loosen it up without it going back in to the engine, which is obviously pretty hard if you're not pulling the sump off.

    Otherwise as said, diesel is the best flush I know of but if the pickup is blocked, chances are there's also a lot of gunk/gum around the rest of the engine making some of the galleries tighter than normal. Once you start loosening it up, other parts can block up easily.

    Good luck!







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