Vanguard BIG BLOCK M540000, Руководство по ремонту, Страница: 25 / 168

TROUBLESHOOTING
General Complaints Most complaints concerning engine
operation include one or more of the following:
• Will not start
• Hard starting
• Lack of power
• Runs rough
• Vibration
• Overheating
• High oil consumption
Equipment Check
What often appears to be a problem with the engine may
actually be the result of faulty equipment.
No Start or Hard Start
• Loose belt or blade
• Cranking under heavy load
• Misadjusted controls
• Improperly operating oil pressure switch.
Engine Will Not Stop
• Equipment stop switch not functioning
• Engine ground wire damaged or disconnected
Vibration
• Bent cutter blades
• Loose spindles and couplings
• Bent/broken deck or weldments
• Bent crankshaft
• Loose equipment mounting bolts
• Damaged or worn belts and pulleys
• Out of balance impeller
Power Loss
• Bind or drag in moving parts of equipment
• Grass build-up under deck
• No lubrication in equipment gear box
• Excessive belt tension
Systems Check
Once equipment sources are ruled out, most symptoms can
be traced to one or more of the following. Perform these
checks in the order listed.
1. Ignition
2. Fuel System
3. Compression
Preliminary Instructions
Prior to starting any repair or maintenance operation.
Make sure you are familiar with ALL safety warnings and
procedures as outlined in SECTION 1 - SAFETY AND
GENERAL INFORMATION - Safety Information .
ALWAYS wear safety glasses and gloves while performing
any maintenance and repair operation.
Check Ignition System
1. If the engine cranks but does not start, move to step 2. If
engine runs, but misses, move to step 9. Repeat testing
steps on BOTH cylinders.
Engine Does Not Start
2. Verify that engine oil level is within the cross hatch
pattern on the dipstick.
3. Obtain an Ignition Tester. See Special Tool List in this
section.
4. Remove spark plug wire from spark plug terminal.
5. See Figure 23 . Install free end of spark plug wire onto
inline tester prong. Install tester alligator clip onto good
engine ground.
23
6. If equipped, move throttle control lever to FAST.
7. Activate the starter motor allowing the engine to crank.
Observe the spark tester window. If a spark is observed
jumping the tester gap, the ignition system is functioning.
8. If spark is not present, move to step 15.
Engine Runs But Misses
9. Obtain an Ignition Tester.
10. Remove spark plug wire from spark plug terminal.
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