Operation On Float Carburetors; Checking Float Carburetor Parts; Brass Type Float - Tecumseh SPECTRA 37 Service And Repair Manual

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b) OPERATIONS ON FLOAT CARBURETTORS
Removal and disassembly of the carburettor
- Remove air cleaner.
- Disconnect fuel pipe. Empty fuel bowl by means of the
push button (f - Fig 14).
- Remove cover or control panel to allow access to the
carburettor.
- Disconnect choke and throttle linkage.
- Remove carburettor from engine.
Checking carburettor parts.
After disassembly clean all metal parts of carburettor with
solvent. Dry thoroughly with clean compressed air. Then
check parts as follows:
- Check main and idle adjustment screws for wear. Should
the tapers show excessive wear, replace. Check that
gasket is free from defects - replace if any damage is
apparent. To remove and replace main jet use special
tool supplied by Tecumseh (Fig 15-A).
- Check that screwdriver cut in main nozzle (part B, Fig
15) is not damaged and that the main adjustment screw
seat is not deeply stepped or otherwise damaged. Check
that the fuel orifice in main jet (Fig 15, e) is not
obstructed or the hole distorted. Replace if damaged.
- Check the carburettor body for damage, obstructed
passages, or worn spindle bushes. Clean out obstructed
passages with clean compressed air. Replace body if
damaged.
- Check that petrol has not entered the float through
damage caused by mishandling, dents etc, and that
the float shaft is not worn. Replace float if damaged
and shaft if worn.
- Check that petrol inlet needle works freely in its seat
and its tapered portion is not stepped due to excessive
wear. In case of any damage or wear, both on the needle
or its seat, replace both parts.
- Check throttle and choke spindles for wear or the
bearing surfaces for possible distortion or other
damage. Replace if necesssary.

Brass type float

- Check float level as follows:
Invert assembled float and carburettor body and check
clearance between body and float at portion of float
opposite hinge. Clearance should be 3/32" (2,5 mm +/
- 0,5) (Fig 16). If adjustment is necessary, remove the
float shaft and bend the tang (L) on float lever, raising
or lowering it until correct clearance with the float
mounted, is obtained.
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Fig. 15
OLD
Fig. 16
46