Mack E7 Service Manual page 274

5-101.bk Page 2 Friday, March 17, 2006 11:05 AM
Possible Cause
1. Batteries have low output.
2. Loose or corroded battery connections.
3. Broken or corroded wires.
4. Faulty starter or starter solenoid.
5. Faulty key switch.
6. Internal seizure.
Possible Cause
1. Slow cranking speed.
2. Emergency shut-off valve closed or partially
closed.
3. No fuel to engine.
4. Governor throttle shaft linkage binding/improper
setting of accelerator linkage.
5. Defective fuel transfer pump.
6. Poor quality fuel or water in fuel.
7. Incorrect engine oil viscosity.
8. Low compression.
9. Injection pump-to-engine timing incorrect.
Page 9-2
200 TROUBLESHOOTING
ENGINE WILL NOT CRANK
1. Check the batteries. Charge or replace as required.
2. Clean and tighten battery connections.
3. Check voltage at the following connections:
— Switch to starter
— Battery to starter
Replace as required.
4. Check operation of starter and solenoid. Repair as required.
5. Replace key switch.
6. Bar the engine over one complete revolution. If the engine cannot
be turned, internal damage to the clutch is indicated. Disassemble
clutch or engine and repair as required.
ENGINE CRANKS — WILL NOT START
1. Check corrections listed in preceding section, ENGINE WILL NOT
CRANK.
2. Check emergency shut-off system. Make necessary repairs.
3. Check for fuel in the fuel tank. Also check for plugged fuel tank
connections, restricted or kinked fuel suction lines, fuel transfer
pump failure, or clogged fuel filters.
4. Check throttle shaft and accelerator linkage. Repair as necessary.
5. Check transfer pump for minimum output pressure. Change fuel
filters if low. Look for air leaks and recheck pressure. If still below
minimum, replace transfer pump.
6. Drain fuel from tank. Replace fuel filters and fill fuel tank with
MACK-specified diesel fuel.
7. Drain oil. Replace oil filters and fill crankcase with recommended
grade oil.
8. Check cylinder compression. If low, refer to LOW COMPRESSION
in this section.
9. Check injection pump-to-engine timing. Setting is protected by
seals, and must be checked by an authorized MACK Fuel Injection
System Repair facility.
Correction
Correction
200766a
200767a