[Healeys] Overheating query

[Richard Ewald]

There is one mode of failure for a water pump that can cause sudden
overheating.  If the impeller either corrodes and falls apart or the
impeller comes off the shaft, no water will circulate except by
thermo-syphon.  Neither of these are common, but they can happen.
Then of course there was the plastic impellers for MG water pumps that
would get soft and fall off when the coolant got hot.
Rick

On Wed, Sep 7, 2016 at 1:40 PM, BJ8Healeys <sbyers at ec.rr.com> wrote:

> Water pumps usually do not fail suddenly, but get noisy and leak out the
> weep hole in the bottom of the pump housing when they begin to fail.  I
> would suspect the thermostat failed closed, preventing the coolant from
> reaching the radiator.
>
>
>
> Steve Byers
>
> HBJ8L/36666
>
> BJ8 Registry
>
> AHCA Delegate at Large
>
> Havelock, NC
>
>
>
>
>
> *From:* Healeys [mailto:healeys-bounces at autox.team.net] *On Behalf Of *Simon
> Lachlan
> *Sent:* Wednesday, September 07, 2016 12:20 PM
> *To:* 'Healey List'
> *Subject:* [Healeys] Overheating query
>
>
>
> Hi,
>
> This isn’t the usual one ....”my car always runs hot; what’s the cure?” etc
>
> No, this is my very own original.....
>
> Background:-
>
> 1)      The car, MkII BT7, has never had overheating issues before today.
>
> 2)      It has a new, 12 month, modern design radiator.
>
> 3)      It has the correct type(original design) Smiths sleeved
> thermostat. (5 years old +/-).
>
> 4)      The waterpump was in the car when I bought the car +/- 25 yrs ago.
>
> Today’s symptoms:-
>
> 1)      I took it out to the pub today and, on returning, I noticed that
> there was HEAT and then that the gauge was off the scale.
>
> 2)      There was plenty of coolant in the rad and it didn’t seem overly
> hot.
>
> 3)      I didn’t have much time, but I got the impression that the rad
> was not blowing steam or making more of a “cooling-off noise” than usual.
>
> 4)      I also got the impression that the engine was hotter than the rad.
>
> Is this typical of a failed water pump?
>
> How can one differentiate between thermostat issues and waterpump issues?
>
>
>
> Any ideas?
>
> Simon
>
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