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Author: Subject: Reverse Water Pump
Barksavon

posted on 23/5/19 at 08:08 PM Reply With Quote
Reverse Water Pump

We're putting an St170 engine in our Avon, am i right in thinking that we have to fit a reverse running water pump or a different impeller due to the power steering and air con pumps no longer being present.
Also what length of auxiliary drivebelt will be needed now that it doesn't have to drive the power steering and air con
Thanks
Ian

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Nickp

posted on 23/5/19 at 08:26 PM Reply With Quote
Yes you need a reverse impeller if just running the belt around the crank, pump and alternator.
Belt length will depend on the pulley you use on the pump, I made one using a Zetec pump pulley.

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Barksavon

posted on 23/5/19 at 08:44 PM Reply With Quote
Thanks, can you suggest a supplier for a reverse impellor
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Nickp

posted on 24/5/19 at 05:29 AM Reply With Quote
One of these should do you - https://www.ebay.co.uk/itm/Ford-Zetec-Blacktop-1-8-2L-ST170-crankshaft-direction-water-pump-impeller/142425754227?hash=item21293c8a73:g:ahUAAOSwjKFZT7 EN

Just fit it to a new pump.

Here's a thread from when I did mine, with a few tips on there - https://www.locostbuilders.co.uk/viewthread.php?tid=212974

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SJ

posted on 24/5/19 at 09:26 AM Reply With Quote
Or you can fit an idler pulley and keep the standard impeller.
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big_wasa

posted on 24/5/19 at 09:56 AM Reply With Quote
It's down to looks and packaging. If you get the reverse impeller you also need a reverse pulley.
It makes it a dear mod but a very tidy one. You can also shave the front cover for an extra clean look. I even welded a tab to the cover for the alternator torque arm.

An idler pulley is by far the cheapest way of doing things.





[Edited on 24/5/19 by big_wasa]

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Barksavon

posted on 24/5/19 at 06:50 PM Reply With Quote
Thanks guys, as usual great info and advice.
Ian

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Barksavon

posted on 24/5/19 at 07:49 PM Reply With Quote
Where would the idler pulley be located?
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big_wasa

posted on 24/5/19 at 08:08 PM Reply With Quote

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big_wasa

posted on 24/5/19 at 08:11 PM Reply With Quote
eBay Item
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Nickp

posted on 25/5/19 at 05:19 AM Reply With Quote
quote:
Originally posted by big_wasa


An idler pulley is by far the cheapest way of doing things.


[Edited on 24/5/19 by big_wasa]


Unless you make a 'new' pulley from 2 old ones using the ST170 centre and ribbed Zetec outer, like I did
I had to do it that way though because there was only one place to put my alternator. That was on the exhaust side, below the manifold. Given the choice I would've put the alternator on the other side and used an idler.

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big_wasa

posted on 25/5/19 at 09:12 AM Reply With Quote
The st set up pictured cost me a tenner for the belt. Torque arm was a bit of scrap plate out of the spares box as was the pulley.

The first picture,

Reverse impeller ~47. Ike engineering
Reverse Pulley ~65 . Davey Fb
Belt ~10 Gates eBay.
New water pump ~35 not ford but not a cheapo either. Local auto factors

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