Water Pump Overhaul

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mick695
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Location: Newcastle upon Tyne

Water Pump Overhaul

Post by mick695 » Sun Dec 29, 2019 5:57 pm

Evening All

I've got my water cooled Norton in the shed for the winter to catch up on a few little jobs that need doing and a general tidy up...

Since I bought the bike, I've put approx 5,000 miles on it and the water pump has given no problems and the cooling system is working fine. I've no idea how many miles the previous owner rode since the last time the water pump was touched.

Question is, do I leave well alone or is it worth taking a look and see how things are doing behind the cover.... I'm a great believer in not fixing if it ain't broke, but I also like keeping on top of servicing too...

Another question, if I do take a look at the pump, is possible to check out if the seal is the original size or has been machined to take the larger size without too much dismantling?

Looking for advice, recommendations or opinions...

Cheers

Mick

tim harrison
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Re: Water Pump Overhaul

Post by tim harrison » Sun Dec 29, 2019 7:04 pm

The problem is that unless you check you won't know how worn it is. When the Oldham coupling goes it does so without warning and you can't carry on. The overhaul is relatively straightforward, full instructions are on the Startright website. The most critical thing is to ensure that the coupling fully conects across its faces, both no end play and too much equals excessive wear.

Anthony Duffield
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Re: Water Pump Overhaul

Post by Anthony Duffield » Mon Dec 30, 2019 8:54 am

Mick,

I was once told to overhaul the pump every 6k miles, so this is what I do, my pump uses the original size seal, I will post the size and also the size of the modified type so when you get the pump apart you will know what you have.

Tim is right about the oldham coupling, I use black molly grease.

I will get back to you re the seal ASAP

Tony

Anthony Duffield
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Re: Water Pump Overhaul

Post by Anthony Duffield » Mon Dec 30, 2019 9:53 am

Mick,

The OD of the stationary part of the original seal, the part that is a push fit into the pump casing, is 28.6mm

The new size seal stationary part is 30.0mm

The original size seal is available from Ferrier Pumps Aberdeen branch "https://www.ferrierpumps.co.uk/contact" ask for John Ure

Regards
Tony

Anthony Duffield
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Re: Water Pump Overhaul

Post by Anthony Duffield » Mon Dec 30, 2019 9:56 am

Forgot to provide the original seal type

700, 0127, BVPFF

mick695
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Posts: 29
Joined: Sat Oct 17, 2015 9:00 pm
Location: Newcastle upon Tyne

Re: Water Pump Overhaul

Post by mick695 » Mon Dec 30, 2019 5:36 pm

Cheers Lads

Looks like the body of opinion is that an overhaul is worth doing.... so thats what I'll do... would be rude to ignore good advice

Mick

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