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Thread: Hydraulic or Mechanical Tensioner Pulleys on my ZHP

  1. #1

    Hydraulic or Mechanical Tensioner Pulleys on my ZHP

    I am replacing the tension pulleys and belts on my 2005 330ci ZHP 6mt. I'm going to do all three. Which pulleys are mechanical and which ones are hydraulic? Can't tell with the fan and shroud in place. Need to order the parts. Build is 10/04. Is realOEM.com accurate?

  2. #2
    Join Date
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    AC = Mechanical

    Water pump pulley tensioner = could be mechanical, but I would upgrade to hydraulic.

    Deflection pulley = mechanical ball bearing wheel.

    Real oem is good for part number. Grab the number and throw it in the store site you choose.

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  3. #3
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    I like mechanical.
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  4. #4
    Quote Originally Posted by Avetiso View Post
    I like mechanical.
    So do I. Granted, my hydro unit has 208k miles on it.

    Dane, is that why you say hydro is better? Longevity?

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  5. #5
    Join Date
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    Yes. It's "improved"

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    Call Me Dane l 2/2004 330i ZHP l 18x8 ET45 BBS CK's wrapped with Michelin Pilot Sport AS3+ @ 245-40-18 l KW V1 Coilovers in front l KW V1 springs w/ Bilstein B8 dampeners in rear l BMW Performance Rotors l UUC StrutBarbarian l Racing Dynamics Rear Strut Bar l Jim Conforti Shark Injector l Light Birch Interior Trim l Bimmian Celly Mount l M3 Trunk Mat l l e90 Performance E-Brake & Shift Knob l M3 Tri-Stitched Boots l AL Headlight Retrofit with ZKW Lenses l CobyWheel Wrap w/M3 Stitching l LCM sw 4.5 triple blink and rear fogs

  6. #6
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    It's the bearings that fail. Doesn't the hydro version have the same bearings that the mechanical version does?

  7. #7
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    Quote Originally Posted by Dave1027 View Post
    It's the bearings that fail. Doesn't the hydro version have the same bearings that the mechanical version does?
    In my experience, the common wear part is the mechanical spring. The bearing on the deflection pulley is the one that evaporates.

    Anything can happen fella's.

    Sure.... Don't use the upgraded, newer designed hydraulic unit. Use the mechanical one.

    Sent from my SCH-I545 using Tapatalk
    "Flame suit NOT REQUIRED!!!"
    Call Me Dane l 2/2004 330i ZHP l 18x8 ET45 BBS CK's wrapped with Michelin Pilot Sport AS3+ @ 245-40-18 l KW V1 Coilovers in front l KW V1 springs w/ Bilstein B8 dampeners in rear l BMW Performance Rotors l UUC StrutBarbarian l Racing Dynamics Rear Strut Bar l Jim Conforti Shark Injector l Light Birch Interior Trim l Bimmian Celly Mount l M3 Trunk Mat l l e90 Performance E-Brake & Shift Knob l M3 Tri-Stitched Boots l AL Headlight Retrofit with ZKW Lenses l CobyWheel Wrap w/M3 Stitching l LCM sw 4.5 triple blink and rear fogs

  8. #8
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    Quote Originally Posted by danewilson77 View Post
    In my experience, the common wear part is the mechanical spring. The bearing on the deflection pulley is the one that evaporates.

    Anything can happen fella's.

    Sure.... Don't use the upgraded, newer designed hydraulic unit. Use the mechanical one.
    I'm not disputing. I am only trying to understand exactly what needs to be replaced because at least one of mine is making noise after a cold start. I would think I only need to replace the pulley with bearing part and not the entire assembly with tensioner.

  9. #9
    Join Date
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    I know. I'm just screwing with you. It's all good. I think I got 100k miles out of my mechanical setup. We (enthusiasts) don't typically let stuff fail (preventative maintenance) so I think either setup is fine. I thought it was tough to find the mechanical water pump tensioner though (superceded)? Maybe not

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    Call Me Dane l 2/2004 330i ZHP l 18x8 ET45 BBS CK's wrapped with Michelin Pilot Sport AS3+ @ 245-40-18 l KW V1 Coilovers in front l KW V1 springs w/ Bilstein B8 dampeners in rear l BMW Performance Rotors l UUC StrutBarbarian l Racing Dynamics Rear Strut Bar l Jim Conforti Shark Injector l Light Birch Interior Trim l Bimmian Celly Mount l M3 Trunk Mat l l e90 Performance E-Brake & Shift Knob l M3 Tri-Stitched Boots l AL Headlight Retrofit with ZKW Lenses l CobyWheel Wrap w/M3 Stitching l LCM sw 4.5 triple blink and rear fogs

  10. #10
    Join Date
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    Sooo, is there a way to tell if you have the had or mech WP tensioner? I am assembling the parts to do the belts, pulleys, and tensioners, but don't know if I need just a hyd tensioner or the "upgrade" kit as advertised by some vendors.

    Also, does anyone make upgraded metal pulleys, but not underdrive ones?

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