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Thread: 4bd1 engine rpm whine/whirring sound

  1. #1
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    4bd1 engine rpm whine/whirring sound

    Thought maybe a bad bearing or perhaps solenoid on the starter at first. When I couldn't isolate the sound, which is like a whirring or whining sound with increasing pitch when increasing rpm's, I took out a pinpoint stethescope.

    From what I heard then it narrowed it down to hearing it most clearly near the front crankshaft oil seal near the injection pump, but second loudest at the alternator.

    I'll likely take the alternator off and fully test it with an oscilloscope, hopefully just needs a cleaning and repacking the bearings.....but if that's not it, does anyone have any thoughts or experience from tracking down something similar?

    The sound itself sounds a bit like a power steering pump going bad (that's not it, but it sounds like it, in sync up and down with rpm's), except in line eith rpm's and not turning the wheel.

    Also, it doesn't make the sounds when first cranked and idling, but once its warmed up it consistent with rpm's.

    Thanks in advance for input before I get into it.
    Scratching my teenage itch now that I'm in my midlife crisis...
    '87 110 County 4BD1+T+LP (Godzilla)
    '88 110 Perentie Cargo 4BD1+T+LP (Thing1)
    '91 110 Perentie Cargo 4BD1+T+LP (Thing2)

  2. #2
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    my falcon used to do that when the power steering fluid got low and the pump was pumping air with the oil.
    check the fluid level.
    LAND ROVER;
    HELPING PUT OIL BACK IN THE GROUND FOR 70 YEARS
    CARS DON'T GET ANY "GREENER" THAT.

  3. #3
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    Water pump bearing.

  4. #4
    Bearman's Avatar
    Bearman is offline TopicToaster Gold Subscriber
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    Or alternator bearings.
    Cheers......Brian
    1985 110 V8 County
    1998 110 Perentie GS Cargo 6X6 ARN 202516 (Brutus)

  5. #5
    JDNSW's Avatar
    JDNSW is offline RoverLord Silver Subscriber
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    Or timing gears
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

  6. #6
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    Alright gents. Thank you all for the suggestions. I have traced it down to what I am calling a tensioner or pulley. It seems it is the bearings within that I am hearing and I'd like to solve the problem before it gets worse, however trying to shoot grease into it didn't help. May need to get bearing sizes and replace/repack OR replace the part itself to address. Does anyone have the Isuzu part number for the part shown in the red box in the attached photo?

    LLR110_4BD1_tensioner_pulley_redbox_outline.jpg
    Scratching my teenage itch now that I'm in my midlife crisis...
    '87 110 County 4BD1+T+LP (Godzilla)
    '88 110 Perentie Cargo 4BD1+T+LP (Thing1)
    '91 110 Perentie Cargo 4BD1+T+LP (Thing2)

  7. #7
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    Adding another photo of the part now that it's out. Hopefully someone can help me find a replacement. I may be able to take apart to determine bearing size, repack and have a go, but would like to know the part number to replace if needed. Thank you in advance for any help/advice.

    LLR110_4BD1_tensioner_pulley2.jpg
    Scratching my teenage itch now that I'm in my midlife crisis...
    '87 110 County 4BD1+T+LP (Godzilla)
    '88 110 Perentie Cargo 4BD1+T+LP (Thing1)
    '91 110 Perentie Cargo 4BD1+T+LP (Thing2)

  8. #8
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    Yes you can replace the bearings. Best to use C3 bearings. C3 is a clearance for bearings. The faster they spin they need more clearance. Use double sided seal bearings & take the 2 inside seals out. Unfortunately I do not know the size but got mine from Bearing Service. Paul.

  9. #9
    Bearman's Avatar
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    I think I have the bearing numbers mate. Will have a look in the morning.
    Cheers......Brian
    1985 110 V8 County
    1998 110 Perentie GS Cargo 6X6 ARN 202516 (Brutus)

  10. #10
    Bearman's Avatar
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    Righto mate, the bearing is NTN63203LLU/2AS or W203PP dimensions are 40.0 mm OD, 17.0 mm ID and 17.5mm wide. The pulley itself is AYG0403 but I would imagine hard to find. Hopefully your pulley is OK and just need to replace the bearing.
    Cheers......Brian
    1985 110 V8 County
    1998 110 Perentie GS Cargo 6X6 ARN 202516 (Brutus)

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