Thanks. The diameter might just fit in there but because it wouldn’t properly match the entry pipe and less space surrounding it may not work efficiently. Also would be a greater strain on the already old motor.


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68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)

Yes correct. Interesting. Mine is Marked made in Australia. And the spade connectors connect directly through slots in each side. And on label it indicates it can run both ways.


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68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)

No the motor mount holes line up perfectly for the motor. The holes in the flange of the motor actually have rubber grommets fitted I assume to reduce vibration.

My heater has the integrated internal metal air intake tube ...not plastic.

“Code”on smiths label is
FHR 2480 / 03
Nothing next to “model” ...or it’s faded away

I can tell it’s not the first time the heater has been apart. Screws missing... Some foam replaced...

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68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)

Phillb
The motor might be designed to run in both directions, but if you look at the centrifugal fan blades they would be VERY inefficient running in reverse. The same motor was probably used in many different cars with positive or negative earths.
(The radiator fan is slightly less efficient if fitted backwards but that airflow loss would be nothing compared with running a centrifugal fan backwards.)
Dave D

Phil the model is correct, the suffix is an earlier version which probably explains the full metal cowl on the other side? My early car has / 03, the later car (sister to yours) is /10.

These heaters were also supplied to Rileys & Wolseleys, however with different orientation of the locating holes to the underside of the dash. I'm still looking for a motor for you - stand by

Ok this is getting very confusing.

I know from another old thread on here that some of the motors will only run one way.

Also that the cooper s heater fan is supposed to run anti clockwise when viewed from the fan end. Is this correct? It would make sense because it would be throwing the air down toward the front of the heater outlets.

Mine is fitted with a fan that is designed run clockwise. It would probably still work but less efficient?

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68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)

Similar issue discussed here

viewtopic.php?f=2&t=99675&p=1053411&hilit=Cooper+s+heater+direction#p1053411

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68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)

Ok this is very odd. A few people have now responded to say that the correct direction for the motor is anti CW viewed from the fan side. This seems to be correct. They mostly only run one way anyway.

However a number of people have also responded to say that the fan pictured, which is clearly designed and marked to run clockwise with an arrow, is what they have fitted to their heaters.

I just looked back at a restoration thread in the how and again it has this clockwise marked fan!!??

Whats going on?!

(To my eye a fan with the blades the other way should actually be better)


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68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)

In case it helps this is the rotor from a later plastic cased heater. It looks to be the same as yours. The embossed rotation arrow shows clockwise when looking inside the barrel. Diameter is 103mm and height is 56mm. 24 blades.

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

The only explanation I can come up with is that in the case of this particular type of heater they found that it worked better with a fan that is designed to go the opposite way????


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68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)

As Ron has mentioned in the previous (linked) thread, the Mk 1 DC motor has a field winding + armature: reversing the polarity (in this motor [FHM 4342/02]) reverses the magnetic field (direction) in the windings together with current flow, which essentially annuls the change, therefore always turning the motor CCW looking down on the fins.

In regards to efficiency, I have to agree its design, and the fan that was applied to this series of motor, was probably not a concern if it pushed some volume of air, albeit in an inefficient fashion. The fins don't have a laminar flow design, i.e. they are parallel and not spiralled. In a CCW direction they may not be 'scooping' as much air if turning CW, but nonetheless it works in a semi-efficient sort of Smiths way. The fans on all the early metal heaters had the same as Winnabey's embossed direction indicator - CW - and worked in a fashion in the CCW direction too...

BTW I have found a motor with nice balance on the fan fins... it's yours for a nice bloke like you!

F

See the link below for description of how the fan works and an image.


https://www.rs-online.com/designspark/f ... ifugal-fan

Regards
Phil

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Find a job you love and you will never have to go to work !

Phill - some more information that might assist. These pages from the PUB1056M parts book.

I note different part numbers for the motor in the metal versus plastic case heaters. This doesn't always mean the actual motor was different though.

Also a part number for the rotor that might assist in searching for a new one.

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

For what it's worth, I am currently overhauling and modifying a Moke heater to fit into my 850. It is basically identical to the UK Mk2/3 heater. The metal case outwardly looks similar to the Mk 1 S heater, but the core is flipped over (easily changed with a couple of holes bored in the opposite end cover) and the direction flap and switch control arrangement is different to accommodate a more modern horizontal slider lever instead of the vertical lever arrangement.

The motor is a more powerful double ended Smiths unit with mirror image fans on each end. They are clearly directional as both have direction arrows on them. And having tested the motor for polarity, I can confirm they are much more efficient when spinning in the correct direction, as explained in the link someone posted above.

One of these units might be a source of a suitable second hand fan. They are a lot cheaper than S heaters and can be made to look almost identical if you so desire. I found mine on Gumtree for $50 and it was in good working order. Plenty in UK available cheap too but shipping might be prohibitive.