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Thread: Stewart Water Pump

  1. #1
    Join Date
    Jan 2009
    Location
    Chicago, IL
    Posts
    356
    My Cars
    2001 330i and 2005 330i

    Stewart Water Pump

    I changed out the OEM for a Stewart at 66K. Now has 139. Auto trans. Noise sounds clutch-like to me. Sort of a rattling but only when on brake or sitting in Park. Doesn't sound like the loud marbles-in-a-can I've heard in other posts. Do any of you have a read on the life expectancy of a Stewart pump?
    Along the way, I've just changed the idler and tensioner pulleys with new belts (and new mech tensioner for the A/C). Also replaced the fan clutch. The alternator was replaced around 90K with a rebuilt from Silver Springs BMW. Hidden OBD sez voltage is correct; also shows water temp to be about 94C at idle.
    Mileage seems to trending downward: 15.6 MPG with an average speed of 19.2 (mostly local driving). Seems like I was in the middle 16's not long ago.
    TIA,
    Johnny
    Johnny Murray

  2. #2
    Join Date
    Sep 2008
    Location
    Sandy, Oregon
    Posts
    430
    My Cars
    2002 330Ci, 1995 325is
    I put over 100,000 miles on the Stewart pump in my e36 and never had a problem. This was after 2 BMW water pumps in less that 15,000 miles. I put one in my e46 s soon as I got it. Along with a new thermostat and other cooling system parts. I've never had a reason to regret using Stewart pumps.

  3. #3
    Join Date
    Aug 2010
    Location
    California
    Posts
    439
    My Cars
    325e 535i M5 325iT 330i
    Quote Originally Posted by johnjmurray View Post
    I changed out the OEM for a Stewart at 66K. Now has 139. Auto trans. Noise sounds clutch-like to me. Sort of a rattling but only when on brake or sitting in Park. Doesn't sound like the loud marbles-in-a-can I've heard in other posts. Do any of you have a read on the life expectancy of a Stewart pump?
    Along the way, I've just changed the idler and tensioner pulleys with new belts (and new mech tensioner for the A/C). Also replaced the fan clutch. The alternator was replaced around 90K with a rebuilt from Silver Springs BMW. Hidden OBD sez voltage is correct; also shows water temp to be about 94C at idle.
    Mileage seems to trending downward: 15.6 MPG with an average speed of 19.2 (mostly local driving). Seems like I was in the middle 16's not long ago.
    TIA,
    Johnny
    Are you sure the noise is coming from the water pump? Suggest you use a piece of hose as a stethoscope to poke around and isolate where it is coming from. I had a similar noise coming from our car (automatic transmission; rattling only at idle; in park or in gear) and it turned out the flex plate between the flywheel and torque converter had cracked.

  4. #4
    Join Date
    Dec 2013
    Location
    Chicagoland area
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    2,866
    My Cars
    EXOTICS
    Check for loose heatshields.
    "It's not how you race your car, it's how you stand by your car, you better learn that".
    Edited version

  5. #5
    Join Date
    Jan 2009
    Location
    Chicago, IL
    Posts
    356
    My Cars
    2001 330i and 2005 330i
    Thank you all. Stethoscope only seemed to pick up regular motor noises. Man, I hope it's not the flywheel. I'll see if I can capture the noise with a vid.
    Johnny Murray

  6. #6
    Join Date
    Jan 2009
    Location
    Chicago, IL
    Posts
    356
    My Cars
    2001 330i and 2005 330i
    Couldn't get the vid off my phone; however, based on Jackson's suggestion, I was able to park near a wall. The noise was more prominent from under the car. Goes away at 1500 RPM. As soon as this crappy weather breaks, I'll get the car on jacks and see.
    Johnny Murray

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