DETROIT DIESEL
Preventive Maintenance
Item 15
Item 17
all dust after the cleaning operation. If the slip rings are rough or out of round, replace them. Inspect the terminals for
corrosion and loose connections and the wiring for frayed insulation.
Item 16
Check the specific gravity of the electrolyte in each cell of the battery every 100 hours or 3,000 miles. In warm weather,
however, it should be checked more frequently due to a more rapid loss of water from the electrolyte. The electrolyte
level should be maintained in accordance with the battery manufacturer's recommendations.
Item 17
Lubricate the tachometer drive every 100 hours or 3,000 miles with an all purpose grease at the grease fitting. At
temperatures above +30F (-1C), use a No. 2 grade grease. Use a No. I grade grease below this temperature.
Item 18
Lubricate the throttle control mechanism every 200 hours or 6,000 miles with an all purpose grease. At Item 17
temperatures above +30F (-1C), use a No. 2 grade grease. Use a No. 1 grade grease below this temperature.
Lubricate all other control mechanisms, as required, with engine oil.
Item 19
There is no scheduled interval for performing an engine tune-up. As long as the engine performance is satisfactory, no
tune-up should be needed. Minor adjustments in the valve and injector operating mechanisms, governor, etc. should
only be required periodically to compensate for normal wear on parts.
Item 20
New drive belts will stretch after the first few hours of operation. Run the engine for 15 seconds to seat the belts and
readjust the tension. Then check the belts and retighten the fan drive, pump drive and battery-charging alternator drive
belts after 1/2 hour or 15 miles and again after 8 hours or 140 miles of operation. Thereafter, check the tension of the
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