Thread: water pumps

I guess your talking about a viscous fan hub on your water pump? My SIII parts manual says the 2.6L six had a viscous fan drive from engine suffix "C" onwards. For the 2.25L diesel, is shows both a direct drive four-blade metal fan as standard and a viscous drive 7-blade plastic fan as "optional". No particular date or engine no. references. It looks like the pump itself is the same but the pulley drive hub and everything forward of that is different for the viscous fan.

Send me a direct email and I'll give you a copy of the relevant pages, with all the part nos. Or better yet, find a website with the full Parts Manuals on them as a set of .pdf documents and download a set for yourself. I can't remember where I found them a few years ago but someone on here will know.

Originally Posted by Leo109

I guess your talking about a viscous fan hub on your water pump? My SIII parts manual says the 2.6L six had a viscous fan drive from engine suffix "C" onwards. For the 2.25L diesel, is shows both a direct drive four-blade metal fan as standard and a viscous drive 7-blade plastic fan as "optional". No particular date or engine no. references. It looks like the pump itself is the same but the pulley drive hub and everything forward of that is different for the viscous fan.

Send me a direct email and I'll give you a copy of the relevant pages, with all the part nos. Or better yet, find a website with the full Parts Manuals on them as a set of .pdf documents and download a set for yourself. I can't remember where I found them a few years ago but someone on here will know.

Cheers thanks Leo 109. I managed to get the PDF for the series 3 its about 365 pages long and covers all engines.

I got a direct drive fan for 90 bucks and will swap the hub over as it looks the same as the old viscous pump that i have. there was no listing in any part book for the 2.25 viscous water pump only the 5 cylinder when i asked the auto shop so I can only asume that the optional extra to have a viscous fan was to swap the hubs over as i will be doing.

Any how what are the main advantages of a viscous pump over direct drive.

cheers.

Originally Posted by willvine

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Any how what are the main advantages of a viscous pump over direct drive.

cheers.

Allows the fan to run slower than the pulley at high engine speeds, while running at pulley speed at low rpm according as the slip on the viscous hub is balanced against the drag of the fan. Some are temperature sensitive so they only drive when things get hot, but I don't know about this one. This allows a fan that moves more air at low speed without excessive load/noise at high speed. Properly designed it will give either slightly better cooling and/or slightly better power and noise levels.

John