Air Filters; Polyurethane Type Air Cleaner - Tecumseh SPECTRA 37 Service And Repair Manual

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F. AIR FILTERS
GENERAL
Owing to the nature of the work for which an air cleaner
is designed, it follows that it must have a direct effect on
the carburation. It is, therefore, essential that it is kept
perfectly clean and correctly maintained at all times. Its
function is to protect the inner parts of the engine from
dust particles present in the air, a condition which is
generally aggravated by the operation of the machine.
Should the air cleaner maintenance instructions not be
strictly adhered to, dirt and dust collected in the cleaner
could enter the engine or cause overchoking, resulting
in too rich a fuel mixture. Both the above conditions re-
duce engine life.
These impurities in a 4 stroke engine or admitted in the
mixture of a 2 stroke engine, form an abrasive which
promotes excessive wear to moving parts.
When a 4 stroke engine becomes overchoked due to a
dirty air cleaner, an excessive amount of petrol is drawn
into the cylinder, flushing the cylinder wall, resulting in
insufficient lubrication. It is therefore important that
operators observe the instructions on air cleaner
maintenance.
Engine operation is impaired by an air cleaner in bad
condition and no warranty is granted to users who do not
carefully follow the air cleaner servicing instructions.
Tecumseh engines are fitted with the following types of
air cleaners:

1. POLYURETHANE TYPE AIR CLEANER

This consists of a polyurethane foam element retained
in its housing by a cover (Fig 1). A metal grill is fitted in
the base of the container to prevent the element being
drawn into the engine.
Maintenance of this type is carried out by washing the
polyurethane foam element in a mixture of water and
household detergent, providing that the element is Fig. 1
thoroughly dried before re-oiling.
(Should the foam element be excessively impregnated
with dirt after prolonged use, replace it).
After this cleaning operation, wet the polyurethane foam
with a spoonful of mineral oil and squeeze it lightly to
obtain a uniform distribution of the lubricant through the
element. Clean the container and re-fit the element.
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