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Water pumps.

Technical issues not related to a DLOC car marque, eg tyres, ethanol, other car makes, etc. and legal, political and insurance
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Stan Thomas
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Posts: 795
Joined: Sat Feb 13, 2016 2:14 pm
Location: Penkridge. Staffs.

Water pumps.

Post by Stan Thomas »

Very early Daimlers had water pumps driven by a jack-shaft from the dynamo and comprising of a steel shaft running in a phosphor bronze bearing with a spring-loaded conical carbon graphite seal at the drive end. The carbon graphite seal is relatively easy to replicate (the carbon graphite is quite cheap to buy - but must be the resin-pregnated type (although you will look like Al Jolson when you make one, as it gives off what can only be described as soot when turned on a lathe).

However, in the light of modern materials, is there a better bearing material than phospor bronze for the bush - which of course is only water lubricated?

Why I ask is the drive shaft in my pump is in absolutely "as new" unworn condition - yet there is quite a lot of play in the bearing. Is this because the phosphor bronze bearing is worn - or a greater clearance has to be provided given it operates in water? ( The normal "rule" for small diameter phosphor bronze bearings is "one thou" per inch of diameted plus one thou - so I'd expect to provide no more than two thou max in the bearing - when turning one - but of course that is with oli lubrication).

Which leads me to another quandry - if there is "slop" in the bearing to provide for "water" lubrication, the conical faces of the seal will not mate correctly, leading to slight leakage - which is where I came in.

Any advice on bearing materials and running clearances??

Stan.

classiclife
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Location: Ridgewood - East Sussex
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Re: Water pumps.

Post by classiclife »

Hello Stan,

Are you looking to rebuild the pump yourself or have it done elsewhere ??

If the latter, I have used this company a number of times as have many of my fellow classic vehicle chums. It's an excellent company and use modern day technology to ensure their pumps remain problem free. In fact so confident are they of their work they provide a no quibble life time guarantee on their units; I've never had an issue with any of the pumps they have refurbished for me.

In fairness their website is not great, but the knowledge and work is excellent.

Maybe worth making contact {not sure if their factory is open} just to get some background spec info relating to your questions.

http://www.ep-services.co.uk/our_company

Good luck.

Richard.
1968 Daimler V8-250 Saloon
DLOC East Sussex Branch Secretary
DLOC 2.5L V8 & V8-250 Registrar - https://www.dloc.org.uk/v8-250
DLOC 2024 International Rally - https://www.dloc.org.uk/rally-2024

Stan Thomas
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Wise Man
Posts: 795
Joined: Sat Feb 13, 2016 2:14 pm
Location: Penkridge. Staffs.

Re: Water pumps.

Post by Stan Thomas »

Hi Richard,

Firstly, thank you for your reply. Thankfully, as a retired engineer with my own workshop and tool-making equipment I tend to do everything myself - in fact the only job outsourced so far is having the time-clock overhauled.

I "served my time" on Daimlers back in the early 1950's, but that was on Conquests and the like, not a sleeve valve as I have now. In fact, I still have the epicyclic gearbox bus-bar setting height guage I had to make as an apprentice. Happy days!!l

Regards,

Stan.

classiclife
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Re: Water pumps.

Post by classiclife »

And happy memories for the most part, I would say, Stan.

What an excellent engineering history to have, they certainly were the days when "we" had an engineering industry in this country.

Best wishes.

Richard.
1968 Daimler V8-250 Saloon
DLOC East Sussex Branch Secretary
DLOC 2.5L V8 & V8-250 Registrar - https://www.dloc.org.uk/v8-250
DLOC 2024 International Rally - https://www.dloc.org.uk/rally-2024

Stan Thomas
Wise Man
Wise Man
Posts: 795
Joined: Sat Feb 13, 2016 2:14 pm
Location: Penkridge. Staffs.

Re: Water pumps.

Post by Stan Thomas »

Those "happy days" included the day I ground a chisel and the end was blued - and I got reported to the superintendant for it and was called into his office. I also got told off for not using a full stroke of a hacksaw - as the foreman said "we've paid for that blade to use all the teeth, not just the bit in the middle".

The foreman told me to use a mallet when reaming a hole to get the reamer though with the least amount of turning - otherwise the hole will look like a "!*!!XX*!ing" church bell (his words not mine). Then I was told off for not opening a door whilst adjusting the lock on another door - "to let the air out" I kid you not!! All for £2.16/- a week.

Later I had day release to attend Tech - and one of the modules was epicyclic gearboxes. I asked if I could bring one in to practice brake band adjustments - and the instructor when ape**** when I turned up with one still in a car!!

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