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Need Help! Loud Knocking Front End - Video Included.

Discussion in 'VN - VP Holden Commodore (1988 - 1993)' started by Nate420, Feb 13, 2020.

  1. Nate420

    Nate420 New Member

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  2. Trevor loves holden.

    Trevor loves holden. Well-Known Member

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    Remove the belt and start the car if noise goes away then test your bearing and water pump, spin them by hand.
     
  3. Nate420

    Nate420 New Member

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    Hi. Thank you for reply.

    I'm starting to suspect water pump as it looks like a slow leak out front of that location for a long time, and my coolant reservoir tank would always go dry even after filling it up. although i never had any cooling issues.

    Ill test that and report back.
     
  4. VPRob

    VPRob Active Member

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    I couldn't get your video to play but have a good look at your harmonic balancer. If the rubber insulator section of that has failed it makes a hell of a knock
     
  5. MikeC

    MikeC Active Member

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    You've had a look for intake and exhaust leaks? I don't think it's bearings or the water pump as it goes away when you rev the engine.
     
  6. Trevor loves holden.

    Trevor loves holden. Well-Known Member

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    Video wasn't really a good one anyway wasn't longer enough and didn't move the phone closer enough, if the op got in there and moved it around it might of pin pointed the sound better.

    Noise doesn't go away, its a hollow tap / knock like water pump.
     
  7. Nate420

    Nate420 New Member

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    Cannot see any visible damage on the harmonic balancer.

    Ill check it out mate but exhaust system isn't that old got it don't about 2 years ago.

    My apologies. I wasn't planning to upload that vid was just to show how it sounded to a friend. I'll get some proper footage for you all when i replace the water pump on the weekend.
     
  8. Trevor loves holden.

    Trevor loves holden. Well-Known Member

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    It might not be the water pump but if its leaking I be doing it anyway.
     
  9. Nate420

    Nate420 New Member

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    Hey mate. i removed the belt today and the sound went away completely. however, i forgot to do the spin test.
    Still waiting for the Water Pump to be delivered.
     
  10. Trevor loves holden.

    Trevor loves holden. Well-Known Member

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    Well that's good news you now no its not internal, sounds like the pump mine did that, the noise will be the fins on the pump hitting the wall in the housing, its only a guess it called be the alternator or even the bearing on the A/C. compressor pulley.
     
  11. losh1971

    losh1971 Well-Known Member

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    I'm inclined to think it's a balancer rattle.
     
  12. VPRob

    VPRob Active Member

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    The mechanic's stethoscope is the way to go. Use a 1 metre length of garden hose, one end in the ear, point the other towards the suspect areas. It pinpoints the sound remarkably. You will KNOW where the sound is coming from.
     
  13. MikeC

    MikeC Active Member

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    I've used a long screw driver as a stethoscope - but watch the fan blades.
     
  14. HarryHoudini

    HarryHoudini Active Member

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    Yep,classic symptoms before the HB internals disintergrate but you never know for certain without seeing the car.
     
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  15. VPRob

    VPRob Active Member

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    Try the hose. Much safer and remarkably effective at isolating the source of the sound
     
  16. MikeC

    MikeC Active Member

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  17. Nate420

    Nate420 New Member

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    Replaced the water pump and the sound is gone!
    Looks like it was the water pump bearing, when you spin it it makes noise.

    Thank you for the help.

    Water pump $50
    1 hour mobile mechanic labor $120

    I didn't fix it myself because i would of have to buy the screw/gasket sealant stuff that cost about $50 extra and mobile mechanic did for free.
     
  18. Trevor loves holden.

    Trevor loves holden. Well-Known Member

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    Gr8 news.
     

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