AHU P/S Delete Pulley Assy - TDI - VE Pump TDI Engines - VWDiesel.net The IDI, TDI, and mTDI source.

• AHU P/S Delete Pulley Assy by GEE-BEE on 08 Feb, 2015 20:08
• New Kit available
  
  http://qualitygermanautoparts.com/index.php?p=p1281587145&navt=Diesel%20Components
• #1 by libbydiesel on 12 Feb, 2015 17:06
• Why would you want an unnecessary idler?  It's easier, more reliable and less expensive to eliminate the pump and do the necessary pulley swap to run without it.
• #2 by vanbcguy on 12 Feb, 2015 17:50
• The kit is for the specific scenario of wanting AC but no PS. 
  
  If you don't want either AC or PS then the ABA pulley works fine, if you want no AC but you DO want PS then you run the PS pump on its own belt with the ABA pulley.  If you want AC but no PS you're SOL since you can't use the ABA pulley and still drive the AC compressor with the serpentine belt, and there's no way to tension the water pump v-belt without something in the PS pump location.
• #3 by libbydiesel on 22 Mar, 2015 01:23
• I have an AHU with A/C and no PS in my '83 vanagon and I like my setup a lot better than having an additional idler that can fail and stop the running of my critical water pump.  The 1.6TD Quantum and Audi 4000 came with a water pump pulley that has the correct offset (when flipped around) and also is a split pulley design with shims for belt tension adjustment.  It is still available new from VW as are the shims.  I've posted the part #s before for all the parts but I'm too lazy to look them up again.  The end result is the serp belt runs the alt and A/C compressor and the water pump is run by its own dedicated v-belt.
• #4 by libbydiesel on 22 Mar, 2015 01:29
• Found my post with part #s:
  
  

  Quote from: libbydiesel on 21 Apr, 2013 18:17

  What would make adding a custom idler and correctly sized ribbed belt easier or better than the stock bolt-on quantum water pump pulley?  The Q pulley is part number 068121029A, the shims are 068121185B (4 or 5 will suffice) and the belt is 10x650.  The pulley is still available new from VW for $60ish and the shims are less than $2 each.   
  
• #5 by G60ING on 29 May, 2015 15:47
• I'm not 100% certain because I've never tried it but couldn't a person use an AEB 20V passat's waterpump pulley and belt? Not tensioner required, but I will say that the part linked about looks like a nice chunk of work.
• #6 by libbydiesel on 29 May, 2015 18:20
• I haven't dealt with the AEB, but in looking it up it appears to be a v-belt split pulley design much like the quantum one that I posted.  The offset does not look correct, though, for the v-belt pulley on the AHU.  I know the quantum one is correct as I've had it working on my '83 AHU equipped vanagon for several years (4?) without issue.  If the quantum pulley becomes NLA, it looks like the AEB one coule be shimmed out easily enough and is a very nice fallback.  Thanks for the info. 
• #7 by G60ING on 03 Jun, 2015 23:42
• Here are some pics I have from a motor build a few years back hopefully they will help somebody in a similar bind:
  
  
• #8 by libbydiesel on 02 Jul, 2015 13:12
• I would definitely prefer the Quantum/Audi pulley over that setup.  In the pictured AEB setup, the water pump (the only critical component) is relying on the proper function of all the other accessories, serp tensioner, idler and the water pump belt itself.  With the Quantum setup, the water pump is driven by the crank on its own dedicated belt which means that all of the non-critical accessory components and serp belt/tensioner can fail and you can continue to motor on indefinitely without risk to the engine. 
• #9 by dave.arthur on 10 Oct, 2019 20:45
• Quote from: vanbcguy on 12 Feb, 2015 17:50

  
  If you don't want either AC or PS then the ABA pulley works fine...
  

  
  So I have an AHU that was fitted with a P/S and A/C. I only need the water pump and alternator. What is the ABA fix? Is there other accessory bracketing that will work ... This is going into a Vanagon /T3.
  
  Thanks
• #10 by libbydiesel on 10 Oct, 2019 22:02
• Get the serp water pump pulley and the correct serp belt to run alt and water pump.  Bob's your uncle. 
• #11 by dave.arthur on 11 Oct, 2019 07:36
• What engine would the 'correct pulley' be from? I found this pulley from vdamper http://www.vdamper.com/Serpentine-Water-Pump-Pulley--19-TDI-%E2%80%93-104mm_p_62.html
  
  I note that is apparently smaller to spin the water pump a little faster on a diesel host.
  
  
• #12 by libbydiesel on 11 Oct, 2019 11:46
• That looks like a really good option.  The stock serpentine water pump pulley was actually flat and ran the points of the belt on the flat steel surface which I always thought was really odd although it worked fine.
  
  This is the stock pulley:  https://www.ecstuning.com/b-genuine-volkswagen-audi-parts/water-pump-pulley/021121031d/?gclid=EAIaIQobChMIq6u5scWU5QIVD_DACh1o5gsYEAQYASABEgLDw_D_BwE
• #13 by dave.arthur on 11 Oct, 2019 18:56
• If that pulley has a smooth surface running against the ribs of the belt, it is certainly not as good as running with a ribbed pulley. The pulley from vdamper looks like a good investment.
  
  
• #14 by libbydiesel on 11 Oct, 2019 19:21
• I agree.  Thanks for the link on it.  I wasn't aware that someone was making/selling a ribbed version.  I'll definitely go that route if I run one without A/C