Zamboni 445 - Oxygen Sensor; Catalytic Converter; Engine Ignition Timing

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Ice Rink Air Quality
Oxygen Sensor
The oxygen sensor is a critical component used by the engine controller. Correct oxygen
sensor operation should be veried at each engine service or tune-up (every 800 hours).
The oxygen sensor must be replaced every 1500 hours of operation.
Catalytic Converter
Your Zamboni ice resurfacer is equipped with a “three-way” catalytic convertor. The catalytic
convertor is designed to reduce the amount of certain exhaust gases. A three way catalytic
reduces CO, hydrocarbons and NO
X
, (NO
2
is a member of the NO
X
family).
Catalytic convertors are items that need regular service. A catalytic convertor may be
damaged by incorrect engine timing or by an engine air-fuel ratio that is incorrect. Operating
the machine with the check engine light on may reduce the performance of the catalytic
convertor and may also shorten the life expectancy of the catalytic convertor.
A catalytic convertor has a xed lifespan. It may lose efciency and start to allow more
pollution to pass through it without being treated.
DANGER!
If the check engine light turns on during normal operation of the
machine, the machine must be serviced immediately!
Engine Ignition Timing
The engine ignition timing is one important factor that will affect the engine’s production of
exhaust emissions. The engine timing is factory set and is not designed to need adjustment.
A machine with advanced timing can produce high levels of NO
x
and one with retarded
timing can produce high levels of CO. Either of these conditions can adversely affect the
catalytic convertor performance and life.
DO NOT ADJUST THE ENGINE TIMING!