We recommend only medium light high-grade gas engine oil for use in the Model T motor. A medium light grade of oil is preferred as it will naturally reach the bearings with greater ease and consequently less heat will develop on account of friction. The oil should, however, have sufficient body so that the pressure between the two bearing surfaces will not force the oil out and allow the metal to come in actual contact. Heavy and inferior oils have a tendency to carbonize quickly, also "gum up" the piston rings, valve stems and bearings. In cold weather a light grade of oil having a low cold test is absolutely essential for the proper lubrication of the car. Graphite should not be used as a lubricant in the engine or the transmission as it will have a tendency to short-circuit the magneto.
| How often should Oil be drained from Crank Case? | Answer No. 101 |
It is advisable to clean out the crank case by draining off the dirty oil when the new car has been driven three hundred and fifty miles; thereafter it will only be necessary to repeat this operation about every seven hundred and fifty miles. Remove the plug underneath the flywheel casing and drain off the oil. Replace the plug and pour in a gallon of kerosene oil through the breather pipe. Turn the engine over fifteen or twenty times so that the splash from the kerosene oil will thoroughly cleanse the engine. Remove crank case plug and drain off kerosene oil. It is of vital importance that all the kerosene be removed from the depressions in the crank case. To do this put about a quart of lubricating oil into the motor and turn engine over several times, then remove the crank case plug and drain off the flushing oil; then replace plug and refill with fresh oil. (See Answer No. 3.)
| How often should Commutator be oiled? | Answer No. 102 |
Keeping the commutator well oiled is a matter of far greater importance than many drivers believe, and is necessary in order to have a smooth operating engine. Don't be afraid to put a little oil into the commutator every other day—at least every 200 miles. Remember that the commutator roller revolves very rapidly, and without sufficient lubrication the parts soon become badly worn. When in this condition perfect contact between the roller and the four contact points is impossible, as a result the engine is apt to misfire when running at a good rate of speed.
Oiling the Ford Commutator. (Cut No. 19)
| What about Lubricating the Differential? | Answer No. 103 |
Do not make the mistake of putting too much grease in the differential housing. The housing should not be more than one-third full. The differential is supplied with the required amount of lubricant when the car leaves the factory. The oil plug should be removed about every 1000 miles and more grease added if necessary. If a fluid grease is used the level should be approximately one and one-half inches below the oil hole.