Craftsman 580.328310 Owner's Manual page 35

Emissions Durability Period and
Air index
Information On Your Engine Emissions Labe_
Engines that are certified to meet the California Air
Resources Board (CARB) Tier 2 Emission Standards must
display information regarding the Emissions Durability Period
and Air Index. The engine manufacturer makes this
information available to the consumer on emission labels.
The Emissions Durability Period describes the number of
hours of actual running time for which the engine is certified
to be emissions compliant, assuming proper maintenance in
accordance with the Operating & Maintenance Instructions.
The following categories are used:
Moderate: Engine is certified to be emission compliant for
125 hours of actual engine running time.
Intermediate: Engine is certified to be emission compliant
for 250 hours of actual engine running time.
Extended: Engine is certified to be emission compliant for
500 hours of actual engine running time.
For example, a typical walkobehind lawn mower is used
20 to 25 hours per year. Therefore, the Emissions
Durability Period of an engine with an intermediate rating
would equate to 10 to 12 years.
The Air hdex is a calculated number describing the relative
level of emissions for a specific engine family. The lower the
Air Index, the cleaner the engine. This information is
displayed in graphical form on the emisions labe!.
Emissions Compliance Period On Engine
Emissions Compliance Labe_
After July 1, 2000 certain Sears engines will be
certified to meet the United States Environmental
Protection Agency (USEPA) Phase 2 emission
standards. For phase 2 certified engines, the
Emissions Compliance Period referred to on the
Emissions Compliance label indicates the number of
operating hours for which the engine has been shown
to meet Federal emission requirements. For engines
less than 225 cc displacement, Category C =
125 hours, B = 250 hours and A = 500 hours. For
engines of 225 cc or more, Category C = 250 hours,
B = 500 hours and A = 1000 hours.
This engine has an intermediate rating with and Air
Index of 2. The EPA Emissions compliance period is
Category C. The diplacement of this engine is 570 cc.
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