Norman SC Engine

Good evening Peeps,

Having just acquired a Norman SC which is in need of some restoration, I require a manual. Does such a Golden Fleece exist?

Basically the engine has no compression, hopefully just stuck piston rings, however when I strip it down, things like bore diameter will be required. Valve clearances as well, points and plug gap would be a boon.

This is a lovely little engine complete with shielded plug/magneto lead , base and cage. Unfortunately the fuel tank is not original, not having a clue as to location shape etc I’m not fussed. The base has the original service plaque which is nice.

So any information and or how to contact “Air-Cooled” would be greatly received

Have fun & Stay Safe

G

Hi Paul, Phillip (aircooled) is 'Blue Cat' on this forum.

Pete.

Hi and a warm welcome to the forum.
I look forward to seeing some pictures of your new project. I have a T300 festering under a shelf - must pull it, and my finger, out.

Guldner wrote:Good evening Peeps,

Having just acquired a Norman SC which is in need of some restoration, I require a manual. Does such a Golden Fleece exist?

Basically the engine has no compression, hopefully just stuck piston rings, however when I strip it down, things like bore diameter will be required. Valve clearances as well, points and plug gap would be a boon.

This is a lovely little engine complete with shielded plug/magneto lead , base and cage. Unfortunately the fuel tank is not original, not having a clue as to location shape etc I’m not fussed. The base has the original service plaque which is nice.

So any information and or how to contact “Air-Cooled” would be greatly received

Have fun & Stay Safe

G

Hi,

No compression - probably stuck rings, but could also be stuck valve or worn valve seating.

Bore 60 mm.
magneto points 12 thou if BTH, 15 thou if Wico A
plug gap 20 thou
Points open 2 inches before TDC (which is marked on the flywheel).
Tappets 2 to 3 thou clearance when cold.

Tank is usually mounted inside the cage.

If you have a few photos please add them to the thread.

I can give you a date of supply if you supply the engine number (stamped on a raised part of the cowling casting under the magneto) should be something like SC1234

SCL 1800

SC1800
Date of manufacture is November 1941, and supplied to the Air Ministry (as confirmed by the brass plate on the frame).
These were an AC test set for the Air Ministry, produced to Ministry of Aircraft Production contract. They are recorded (by Normans) as being reference 42Y/3, but yours is marked 42Y/1 (no idea why this stores reference was changed). Also marked with Tudor Crown.
Engines fitted with the grooved flywheel (not plain), and also with the new type flywheel withdrawing nut.

I don't know what the AC test set is that was fitted to the Norman SC engine, as there are no details recorded, but it could well have been a small alternator of unknown voltage, rated at no more than 500 watts.

Searching the internet suggests that the AC test set with this stores reference was used with GEE Mk1 equipment (GEE was an early form of navigational aid used during WW2). There are a number of AC test sets associated with GEE Mk1 including the Norman SC powered version and also a JAP 4B powered version. The Norman SC version is claimed to be 500 watts AC, or 500 watts at 24 volt DC and 80 volts AC (an DC/AC set, but no differentiation is made). The AC set was used to test the on-board GEE equipment when the plane was on the ground, and is therefore classed as ground equipment. The set being mounted on a pneumatic-tyred hand cart for mobility. This probably exceeds my level of knowledge  

Brilliant….so informative…..I can’t Thank You Enough…….Sorry I didn’t post photos of the flywheel side….I also think that the engine has been turned through 90 degrees….making the unit a close couple unit….Although I haven’t had time to really study the situation yet…..work & dragging t’cavaran away impedes play…