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5. Air/Exhaust System
Ambient Conditions
Clarke engines are tested in accordance with SAE J1349 (Clarke USA) or ISO 3046 (Clarke UK). In this capacity
they may be derated to meet certain site conditions, failure to do so can seriously impede the performance of
the engine and could lead to premature failure.
Ventilation
The engine must be provided with adequate ventilation to satisfy the requirements of the combustion system,
radiator cooling systems where fitted, and allow adequate dissipation of radiated heat and crankcase emissions.
For all this data refer to Installation & Operation Data in Technical Catalog, C133941(see Page 5). This data can
be used for proper sizing of inlet and outlet louvers.
Standard Air Cleaner
The standard air cleaner is a reusable type. Should a situation occur where the air cleaner becomes plugged
with dirt (starving the engine of air), loss of power and heavy black smoke will result; the air cleaner should be
serviced immediately.
The maximum intake air restriction allowed, per engine model, can be seen in the following table.
Air Filter Restriction (Inches of Water)
C18H0-UFAD50, C18H0-UFAD58, C18H0-UFAD68,
C18H0-UFAD70, C18H0-UFAD78
C18H0-UFAD10, C18H0-UFAD18, C18H0-UFAD20,
C18H0-UFAD28, C18H0-UFAD30, C18H0-UFAD38,
C18H0-UFAD40, C18H0-UFAD48, C18H0-UFAD78,
C18H0-UFAC10, C18H0-UFAC18, C18H0-UFAC20,
C18H0-UFAC28
CAUTION: Do not attempt to remove the air cleaner while an engine is running nor run the engine while the air cleaner
is off. Exposed components could cause severe injury to personnel and major internal engine damage could occur
should any foreign matter be drawn into the engine.
The air cleaner manufacturer recommends the following:
1. The pre-oiled reusable elements are serviced with a special oil. The elements can be serviced or replaced.
2. Figure#15 shows the air filter service instructions.
3. When servicing the element is not practical, you can improve filter efficiency by re-spraying with oil.
NOTE: Do not attempt this while engine is running
NOTE: Do not over oil the reusable element
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