1942 - 1947 Chevrolet Shop Manual

0-8

an engine is run in low temperatures, moisture will collect and unite with the gases formed by combustion; thus, acid will be formed and is likely to cause serious etching or pitting. This etching, pitting or corrosion, when using gasoline containing considerable sulphur, manifests itself in excessively rapid wear on piston pins, camshaft bearings and other moving parts of the engine, oftentimes causing the owner to blame the car manufacturer or the lubricating oil when in reality the trouble may be traced back to the character of gasoline used, or a condition of the engine, such as excessive blowbys or improper carburetor adjustment.

S.A.E. VISCOSITY NUMBERS

The viscosity of a lubricant is simply a measure of its body or fluidity. The oils with the lower SAE numbers are lighter and flow more readily than do the oils with the higher numbers.

The SAE viscosity numbers constitute a classification of lubricants in terms of viscosity or fluidity, but with no reference to any other characteristics or properties.

The refiner or marketer supplying the oil is responsible for the quality of its product. Their reputation is your best indication of quality.

The SAE viscosity numbers have been adopted by practically all oil companies, and no difficulty should be experienced in obtaining the proper grade of lubricant to meet seasonal requirements.

CRANKCASE OIL CLASSIFICATIONS

cover and saturate the felt ring on the accelerator pump arm with light engine oil.

STARTING MOTOR LUBRICATION

Every 1,000 miles, lubricate the starting motor by putting a few drops of light oil, or engine oil, in the oil cup.

CLUTCH BALL THROWOUT BEARING

The clutch ball throwout bearing is of the sealed type and is packed with a high temperature lubricant which makes further lubrication unnecessary.

GENERATOR LUBRICATION

Every 1,000 miles, lubricate the generator by putting a few drops of a light oil, or engine oil, in the 2 oil cups.

DISTRIBUTOR LUBRICATION

The ignition distributor is equipped with a grease cup. Fill this cup with chassis lubricant, or equivalent soft, smooth grease and turn down every 1,000 miles.

REAR AXLE AND TRANSMISSION LUBRICATION

The lubrication requirements of passenger car hypoid rear axles differ somewhat from that required in heavy duty hypoid or spiral bevel truck rear axles. The passenger car operates under most severe lubrication conditions at high speed while the truck operates under the most severe lubrication conditions at low speed in low gear and under heavy loads.

The rear axles and transmissions of passenger cars and trucks, as delivered from the factory, are filled with the "Year-around" lubricant indicated below:

Passenger Car, 1/2-Ton and 3/4-Ton Hypoid Rear Axle-SAE 90 Passenger Car Duty Hypoid Lubricant.

1-1/2-Ton Hypoid Rear Axle-SAE 90 Truck Duty Hypoid Lubricant.

Two-speed Rear Axle (Spiral Bevel Gear)- SAE 90 Mineral Oil Lubricant.

All Transmissions: Passenger Cars and Trucks- SAE 90 Transmission or Mineral Oil Lubricant.


	Seconds	Viscosity (Sayboldt			Universal)
Viscosity Number		0°F.			130° F.
Viscosity Number	Min.		Max.	Min		Max.
10-W (•)......20-W (**) S.A.E. 20. ..	5,000 10,000		10,000 40,000	120		185
S.A.E. 30 .				185		255

•Sub-zero pour test.

**Zero pour test.

WATER PUMP LUBRICATION

The water pump is of the ball bearing type and is lubricated at the time of manufacture. The ball bearing water pump requires no further lubrication.

CARBURETOR ACCELERATING PUMP LUBRICATION

(Except Up-draft Carburetor) Every 5,000 miles remove the carburetor dust