Wacker Neuson WM 130, Repair Manual

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Troubleshooting WM 130/170/270 Repair
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13 Troubleshooting
If the engine shows any sign of malfunction, the cause should be
determined immediately and the appropriate countermeasures should
be taken to prevent the problem from worsening. This troubleshooting
section describes certain known problems, their possible causes, and
appropriate action to take. Note, however, that the list of problems
listed here is not all-encompassing. Generally speaking, since there is
the possibility of multiple causes for a single problem, please use your
experience and common sense when deciding on what action to take.
The following three conditions must be met for the engine to start:
1. The cylinder must be filled with the proper fuel-air mixture.
2. There must be good compression in the cylinder.
3. There must be good spark, properly timed to ignite the mixture.
The engine cannot be started unless the these three conditions are
met. There are other factors as well that will make engine starting
difficult, such as a heavy load on the engine when attempting to start,
or heavy back pressure due to a long exhaust pipe.
13.1 Troubleshooting Table
Problem and possible cause Remedy
Starting d
ifficulties
1. Ignition system prob-
lems 1) Spark plug
• Improper gap
• Defective insulation
• Carbon deposits Adjust gap
Replace plug
Clean plug
2) Ignition coil
• Insulation defect or disconti-
nuity
• Poor contact or broken wire
Replace plug
Repair or replace
3) Improper air gap between igni-
tion coil and flywheel Adjust gap