David, two bolts is adequate, have two fans fitted (yes two different cars before some smart Alec picks me up) . John Barlow supplied. They will need finishing if bought castings.

Location: Oakley , hants

R, the deep fined sump is not something I have encountered here (NZ), the other items appear common on the later models. I guess it is possible there may have been some variation in the specifications dependent on location?

Location: NZ

R,

I asked Bill about this - he agreed that the only engines imported into Australia with large sumps could have been a very few of the less usual sports versions.
The standard import would have been the basic UK model Chummy until the introduction of air cleaners and four blade fans with cast iron pulleys.

Tony.

Location: Malvern, Melbourne, Australia

My 4 blade fan also only has two bolts, but that's because it's mounted on a 2 blade spindle...

The colonial four blade fan has four mounting bolts mounted on a slightly different pulley with four threaded 'bosses'.

I have fitted a four bolt fan on a two bolt pulley by drilling and tapping two extra holes.

Cheers, Tony.

Location: Melbourne. Victoria, Australia.

I think the cast iron sump would be from a marine conversion engine. Ports for cooling water to be passed through a copper coil in the oil.

As another 12/4 owner Ruraidh you might like to know that the Ruby air filter has another use if you wish to prolong engine life. Remove the choke unit from your 12/4's carb and replace it with the two outer parts of the Ruby air filter with the paper element from a CF Bedford van sandwiched between them.Connect choke cable to Ruby choke. That was the first thing I did when I purchased my 12/4. In later years I fitted an SU carb with a similar set up using the same paper element. Your father has travelled in this car so the conversion has been blessed!!
Ross

Location: Christchurch, NZ

Apologies for mis-spelling your name Rurairidh. Anything more than 5 letters is a risk for me!
Ross Vesey

Location: Christchurch, NZ

Or even Ruairidh

Location: Melbourne. Victoria, Australia.

Hey Ross,

Great to hear from you again - thanks for that tip, much appreciated.

I had a cast aluminium sump once - went with my Nippy when I sold it. I believe it was a locally cast replica, but I have also seen an original Nippy sump which looked just the same.
You may (or may not) be interested to know that Bantam used a pressed steel sump which was the same depth front to rear, i.e. the bottom sloped to match the bottom of the crankcase. Thus the bottom presents itself more effectively to the air flow, and also, all the crud migrates to the rear where the drain plug is.

Location: Wellington, NZ

Thanks Ivan

Good evening all.
I recently acquired a four bladed fan attached by four bolts to a cast iron pulley similar to the mag type. I trialed fitted it to the Ruby but found that a standard fan belt is too short - so is the export fan belt longer?
Our Thetis marine engine is fitted with an export carb which is in poor condition. I recall someone advertising replacements but cannot find the thread. Are they still available?
Regards
Stuart

Location: Staffordshire, the creative county.

Hi Stuart, is it the side draft or updraft carb you need or just the air filter assy for one? The four blade fan pulleys use a sports width belt, they also appear to come in several diameters what size is the one you have?

Location: NZ