Vanagon EuroVan
Previous messageNext messagePrevious in topicNext in topicPrevious by same authorNext by same authorPrevious page (October 2001, week 4)Back to main VANAGON pageJoin or leave VANAGON (or change settings)ReplyPost a new messageSearchProportional fontNon-proportional font
Date:         Sun, 28 Oct 2001 20:26:19 -0800
Reply-To:     David Marshall <vanagon@VOLKSWAGEN.ORG>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Marshall <vanagon@VOLKSWAGEN.ORG>
Subject:      Re: 30mm vs. 40mm Hub on Diesel Water Pump
Comments: To: Maynard Southard <echomhs@GIS.NET>
In-Reply-To:  <01C15FB3.7C60FC00.echomhs@gis.net>
Content-Type: text/plain; charset="iso-8859-1"

The 40mm is the older style and the 30mm is the newer used since about 1981 or so... the pumps are fully interchangeable, just that you will need the correct pulley to match the hub.

David Marshall

Fast Forward Automotive Inc. 4356 Quesnel Hixon Road Quesnel BC Canada V2J 6Z3 mailto:info@fastforward.ca <mailto:info@fastforward.ca> http://www.fastforward.ca <http://www.fastforward.ca> Phone: (250) 992 7775 FAX: (250) 992 1160

• Vanagon Accessories and Engine Conversions • Transporter, Unimog and Iltis Sales • European Lighting for most Audi and Volkswagen models

-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com]On Behalf Of Maynard Southard Sent: October 28, 2001 10:21 AM To: vanagon@GERRY.VANAGON.COM Subject: 30mm vs. 40mm Hub on Diesel Water Pump

Brace yourself for a dumb question ... Can anyone tell me what the difference is between the 30mm and 40mm hub on the water pump for the 1.6L NA diesel? (Please don't say 10mm!)

The Vanagon diesel requires a 40mm hub on the water pump. I've always thought the dimension referred to the diameter of the surface that the pulley attaches to (the "hub", right?), but I have 3 water pumps on my work bench, one from my '82 Westy diesel (and I know it is not original), one from my '82 Passenger diesel (and I know the whole engine is not original) and one from an '84 Jetta Diesel with no A/C (which supposedly also takes the 40mm hub, but I know it is not original also.) The "hubs" are all the same diameter, but the vanes are different. One has formed steel vanes (kind of like bent fork tines) and the other two have a cast vanes (and they are not identical). Am I just looking at different manufacturing approaches to the tines, or have I misunderstood which hub the measure refers to?

And finally, why does VW use two different hub sizes? I think it has something to do with the pulley drive system - as the Vanagon application uses one belt to drive the water pump from the crankshaft pulley and a second belt to drive the alternator from the water pump pulley. On late 70's and early 80's diesels with A/C, there is a single belt that drives the water pump and A/C compressor from the crankshaft pulley and another belt that drives the alternator off of the A/C pulley. These all seem to spec the 30mm hub. Is the difference because of the way the pulley is attached?

Thanks for any insight.

Maynard Southard (OvO) '79 '82 Westy Diesel "Reinhardt" '82 Vanagon GL Diesel "Sluggo" '93 EV GL "Klinger" '00 Golf GLS TDI "WooHoo" '84 Jetta GL TD "Donor"


Back to: Top of message | Previous page | Main VANAGON page

Please note - During the past 17 years of operation, several gigabytes of Vanagon mail messages have been archived. Searching the entire collection will take up to five minutes to complete. Please be patient!


Return to the archives @ gerry.vanagon.com


The vanagon mailing list archives are copyright (c) 1994-2011, and may not be reproduced without the express written permission of the list administrators. Posting messages to this mailing list grants a license to the mailing list administrators to reproduce the message in a compilation, either printed or electronic. All compilations will be not-for-profit, with any excess proceeds going to the Vanagon mailing list.

Any profits from list compilations go exclusively towards the management and operation of the Vanagon mailing list and vanagon mailing list web site.