Servicing Diaphragm Carburetor; Standard Diaphragm Carburetor Servicing - Tecumseh SPECTRA 37 Service And Repair Manual

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c) SERVICING DIAPHRAGM CARBURETTOR
Standard diaphragm carburettor
To clean carburettor (Fig 5), proceed as follows:
- Remove main jet (nos. 14, 15, 16, 17) and idle jet (nos.
10, 11, 12, 13). Check these for serviceability, replace
worn or damaged jets. On current carburettors, a fixed
main jet is now fitted (8). This is fitted without seals etc,
whereas the idle jet is adjustable and consists of a needle
(10), spring (11), O-ring (12) and washer (13).
- Check that butterflys (3 and 9) and spindles (1 and 7)
operate freely. If any sticking occurs, clean, and if
necessary, replace defective parts.
- Replace the carburettor if the body is found damaged
or broken.
- Remove the 4 screws (26) of cover (25), remove the
gasket (23) and diaphragm (24). At this point, check
visually the gasket and diaphragm. The latter should be
in good condition and not cracked or hardened.
- Remove the valve assembly (18, 19, 20, 21) with a
hexagonal 5/32 spanner (or with a slotted head
screwdriver for valves of the old type), taking care to
extract washer, spring etc. (Fig 6).
Compressed air may now be blown through the valve seat
hole and through the two jet holes to remove any dirt or
blockage.
- Reassemble, referring to Fig 5, making sure that valve
(21) and needle (19) are not damaged or bent. The
needle (19) should protrude approximately level with
the carburettor face, (Fig 7). If needle is sunk, this
denotes that gasket (20) has not been fitted or that the
needle is worn. If needle projects, it is possible that two
washers have been fitted.
Reassemble, install and adjust carburettor.
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Fig. 5
Fig. 6
Fig. 7