Unusual Crankcase

[Malcolm Parker]

Yesterday I was cleaning up a couple of crankcases to assess which one would be best to use for my next engine build.  I spent a couple of hours on the better one but it was only today that I realised that it was different to other cases I have worked on.
The case is number 164859 and has the date 7.9.32 cast onto it, also a part number 1A558.   It is different around the front timing gear casing and also around the base.  
Photos below and of case 167201 for comparison.                     
The casting has a number of small holes that look like woodworm but these are on the surface only and appear to have occurred during the casting process.

[Ruairidh Dunford]

I think this is one of the early 4 speed cases - used on the last of RNs etc, they have similarities with the three speed cases in the areas you highlight.

[Malcolm Parker]

I'm sure you're right, Ruairidh, comparing it to a 1931 crankcase there are many similarities.  I wonder how the engine number 164859 sits in the RN series.  Perhaps our resident expert on RN's can advise on when the first car with the 4-speed gearbox was produced?

[Ruairidh Dunford]

Have a look in the back of Wyatt, or in the index cards on the A7CA Archive site.

[Reckless Rat]

First 4 speed was introduced at chassis n° 159534 (Sept 32) but your crankcase is probably very close to RN/RP change-over which occurred at chassis number 162566

[Malcolm Parker]

Thanks for that, my reference books are still packed away pending the house move, hopefully in the next three or four weeks.

[ppearson]

Good morning Malcolm,

I just love the poster !!

Regards

Peter

[David Stepney]

Your crankcase looks very similar to the one on my car (Engine number 177368) although I do not recall seeing any casting numbers on mine the last time the engine was out. For reference, my car was built in mid-June 1933, has a solid mounted engine and 4 speed crash box.

[Howard Wright]

Good morning Malcolm,

I just love the poster !!

Regards

Peter

Hi Peter

Shameless promotion?  ??

Howard

[ppearson]

Hi Howard,

What a great idea.

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Original size 42" x 29" despatched in a cardboard tube, cost including postage £49.50

A3 size despatched in a cardboard tube, cost including postage £19.50

End of shameless promotion.

Peter