November 1950
1. A correct ignition timing and a precise automatic advance and retard are the first requirements when adjusting the
carburettor.
2. All adjustments must be made with the engine warmed up to its normal running temperature.
3. Every carburettor spits in winter and when the engine is cold, if adjusted to a lean mixture. Poor acceleration and a
tendency of the engine to stall will be the result.
4. Fuels of a higher boiling point promote carburettor flat spot and cause a more or less appreciable dilution of the
lubricating oil.
5. The troubles mentioned under (3) may also be caused by, too less an advanced ignition, faulty contact breaker points, too
less a breaker point gap (correct: 094 mm - 0.15t'), and dirty spark plugs. Especially in winter, the prescribed adjustment of
5° before T.D.C. is of great importance.
6. The present-day quality of fuels in some countries causes a dilution of the lubricating oil of cars mainly used in city traffic
or over short distances. A dilution up to ten per cent is permissible. Ten per cent correspond to 1/4 ltr. (0.5 U.S. pints, 0.4
Imp. pints fuel in an engine Oil filling of 2.5 ltr. (5.3.U.S. Pints, 4.4 Imp. pints the oil level is then approx. 20 mm (4/5")
above the top mark on the oil level gauge. The increased oil level does not cause any engine trouble. If an excessive oil
dilution due to the particular operating conditions of the vehicle, is noticed it is advisable to carry out oil changes at more
frequent intervals, say after every 1000 - 1500 km (600 - 960 miles).
7. An unreasonable way of driving often leads to complaints about a high fuel consumption. The consumption should
therefore be checked under normal driving practice and with a reliable fuel. Only a careful fuel consumption test can
convince the customer that fuel system and engine are not at fault.