BASIC TROUBLESHOOTING
19
4. Experimentation by MTD’s Training and Educa-
tion Department has revealed the following char-
acteristics of MTD engines:
• A leaky PCV system will not build-up substantial
case pressure.
• A leaky PCV system will allow the engine to
ingest contaminants through the system, accel-
erating engine wear.
• A blocked PCV system will allow crankcase
pressure to build very rapidly. Noticeable oil
fumes will be evident in the exhaust within sev-
eral minutes of normal operation.
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