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  1. #1

    Default 1991 2500 hd 4wd

    Hi guys im new to the site, my first chevy...I bought this truck three weeks ago for 1500 great deal it has a 454 that runs strong however it has a heavy whining noise comming from the engine the previous owner told me it was the power steering pump and i noticed it was leaking so i replaced the pump and the same thing a very loud heavy whining. So i thought mabye one of the pulies so to check everything at once i pulled the surp. belt and started the motor and the same thing (whining).It sounds just like a power steering pump going, but louder.The whining gets louder with increse in rpms, In Park or drive I cant figure out what it could be.I think its internal. Also on the heads theirs a decal that says 454 by Tonawanda engine. Im told these engines have a bit more hp due to a roller valve train but not sure any help please!!!!!!

  2. #2
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    murdog94's Avatar
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    Did you bleed the pump properly when you installed it? you have to crank the wheels back and fourth while someone keeps on an eye on the fluid level since the air in the system doesnt really get pushed out fast enough. Also is there a chance it has a pete jackson gear drive instead of a timing chain??
    Mike

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  3. #3
    Sr. Engineer Sam_A's Avatar
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    Welcome to the club!


    2003 Chevy Silverado 2500HD LT 4x4, Crew Cab
    6.6L Duramax Diesel (LB7) with an automatic Allison 1000 5 speed.
    Spray-in bed liner, S&B Air Filter, Homemade CAI ram scoop, ball hitch for Gooseneck
    Black toolbox, metallic-black bowtie, 5.5" NV-200C Bumper Off-Road lights behind a blacked-out grille
    285/75R16E BFG A/Ts
    Future Upgrades: Exhaust, CAI, programmer, intercooler, torque converter

  4. #4

    Default

    Yes, i thought when i first bought the truck it was the pump, its not the pump i removed the surpentine belt and cranked the motor and it still whining the exact same amount i checked the starter to make sure it not getting stuck and i checked the harmonic balancer, nothing wrong with them i think its internal what would make a heavy (powersteering tipe whin) coming from the top end ? It increase's with rpms in gear or not. ...any clue or advice would be great guys thank you...

  5. #5

    Default

    Welcome to the club. I wish I had some advice for you but I am at a loss at the moment.
    2005 Chevy Silverado 1500 Z71 Crew Cab
    8in ProComp Suspension Lift, 4in Shackle Flip Kit, 3in Performance Products Body Lift, 17x9 Moto Metal wheels, 35x12.50x17 ProComp Xterrains, K&N cold air intake kit, Custom 3in exhaust, GoRhrino Black spring loaded steps, Truxedo Bed Cover, "SS" style Instrument Cluster with blue pointers and Trans Temp Gauge, JVC indash touchscreen DVD player, 2 MTX 10in subwoofers, Sony Xplode 1000watt amp, Radio Shack CB with dual black whips, Optima yellow top battery

  6. #6
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    Hey Grip, welcome to the GM truck club. I think there's a good chance Murdog has your answer with the gear drive. Take your belt off again & listen at the front cover. Use a short piece of garden hose, or a transmission funnel up to your ear. There really isn't anything at the "top" of the engine that could cause a "whine" but a gear drive sure will. Gear drives are a popular add on, for DIY'ers.
    It could also be the camshaft is walking foreward & the cam sprocket could be rubbing on the front cover if it has the stock single row cam chain/sprockets. Try & determine " if " the noise is coming from the front cover. If it is, it is either really good news "gear drive" or if it is the cam walking you can cure it easily with a Cloyes true roller, double row cam chain & sprockets & a front cam button.
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
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    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol


  7. #7

    Default

    Thanks guys im glad to be here...... I think im gonna pull the engine saturday and just rebuild it she has 200,000 on her, so it may be a good idea. Ill let you guys know sat what that whining is....Thanks again....

  8. #8
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    Sounds good, and that is one way to be sure you dont have any problems. Good luck with it.

  9. #9

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    It was the gear drive guys thanks for the advice im swaoping back to chain....

  10. #10
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    NOOOOOOOOOOOOOOO!! You're not going to take out a perfectly good gear drive & put in a stock chain & sprockets are you?? They're suppose to make that noise. You know that right??

    **edit Hey Grip, you need to get a "grip". That gear drive is a LOT more accurate than a chain & sprockets. You should consider leaving it on there.

    "The whine of a gear drive cam, the louder whine of the old GM rock crusher 4 speed, plus a loud exhaust, & you could just screw the crappy music from the stereo as far as Im concerned."
    Last edited by stephan; 11-15-2010 at 12:36 AM.

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