Refer to “ Diagnosis of Starter Motor Noise.” PINION CLEARANCE (Gas Engines) 1. Remove the lower flywheel housing cover. 2. Inspect the flywheel for signs of unusual wear such as chipped or missing gear teeth or the flywheel being bent. If the flywheel needs replacing, refer to SECTION 6. 3. Start the engine and gently… Read More »
BATTERY Determine the condition of the battery. Refer to SECTION 6D1 for battery diagnosis and testing. WIRING Check the 10-amp CRANK fuse. Inspect the system for open circuits, loose terminals inside connectors, corrosion, and damage. Verify that no wires are pierced by screws and no harnesses are missing insulation by rubbing on components. Inspect all… Read More »
Refer to figures 8 and 9 for diagnosis of the cranking system. Before removing any component in the system for repair, make the following checks.
Three starter motors are used on these engines. The SD-260 is a straight drive starter with the pinion driven directly by the armature shaft. Pole pieces are arranged around the armature that is energized by wound field coils (figure 3). This type is used on gas engines. The PG-260 achieves gear reduction at a ratio… Read More »
The cranking circuit consists of the battery, starter motor, ignition switch (gasoline engines), engine control switch (diesel engines), neutral start switch (manual transmission), and related electrical wiring (figures 1 and 2). For detailed schematics of the cranking system, refer to the Driveability, Emissions, and Electrical Diagnosis Manual.
Additional ground straps are used to connect the body and frame to the engine and transmission. Always connect all ground straps to ensure a good ground path to the battery from all electrical components. For illustrations and ground strap locations, refer to SECTION 6D5.
Excessive resistance caused by poor terminal connections and partial short circuits through worn cable insulation will result in an abnormal voltage drop in the starter cable. Low voltage at the starter will prevent normal starter operation and cause hard starting. Whenever battery cables are replaced, always use a replacement cable that is the same type,… Read More »
Remove or Disconnect (Figures 11 and 12) 1. Negative cable from the negative battery terminal. 2. Positive cable from the positive battery terminal. 3. Battery hold-down retainer. 4. Battery. Inspect 1. Battery for damage. 2. Cables and connectors for corrosion or wear. 3. Carrier for damage or foreign objects. • If damage is noted, find… Read More »
Do not try to jump start a vehicle i f you are unsure of the other vehicle’s voltage or ground, or if the other vehicle’s voltage and ground are different. Diesel engine vehicles have more than one battery. Should the vehicle have an optional diesel engine or an auxiliary battery option, use only the battery… Read More »