Automatic enrichment device, float chamber lid only, to remove, refit and check float level Operation N/Q-21A

   
                           
 

Workshop hand tools:
Spanner sizes: 0.8125 in. AF open ended
Phillips screwdriver, medium; Flexible 6 in. steel rule

Special tools:
Checking tool for float level, Part No. 606000

Float chamber lid, to remove
1. Remove fuel inlet pipe and float chamber vent pipe.
2. Remove heat insulation cover.
3. Unscrew plug from float chamber lid and remove filter.
4. Remove three retaining screws and washers. Tap side of float chamber lid sharply with screwdriver handle if necessary to separate from gasket. Carefully lift lid of float chamber and remove needle and float assembly. If the gasket is damaged or unserviceable cut along edge of valve body and remove float chamber portion. Do not remove screws holding top cover and valve body. Clean float chamber lid and float chamber if necessary.

  
Float chamber lid removal
A—Plug and washer for filter
B—Nylon filter
C—Float chamber lid
D—Needle
E—Gasket for float chamber, cut at dotted line if replacement is required
F—Float
G—Screw and washer fixing float chamber lid
H—Fuel inlet pipe
J—Float chamber vent pipe
K—Air intake hose
 
       
                     
5. Examine float needle tip for wear or damage. Examine seating in lid.
Replace any faulty parts.
6. Check float level as follows:
(a) Invert float chamber lid.
(b) Locate float needle and float to lid using checking tool for float lid, Part No. 606000 as illustrated.
(c) Check the float level as illustrated, float should rest lightly on the needle.
(d) If float is outside the limits adjust by setting tongue on float lever.
(e) Remove special tool, together with float and float needle.
7. Install float in main body and check for end float of hinge pin in body and clearance around float. Remove float.
8. If gasket has been cut and part removed, obtain a new float chamber and valve body gasket and cut to fit adjacent to the existing valve body gasket. Place cut gasket into position on main body.

Checking float level
A—Float chamber lid
B—Checking tool, Part No. 606000
C—Stirrup for needle
D—Float
E—Upper setting limit
F—Lower setting limit
G—Setting limit indication

 		 

9. Drop needle into seating of inverted float chamber lid. Then ensure the float needle is correctly located on float lever by wire stirrup. Holding float assembly to face of lid with the tip of steel rule or feeler gauge, position the lid over the float chamber close enough to allow the float assembly to be dropped so that the hinge pin falls into the recesses in the body without disengaging the needle from the seating bore.
Lower the lid on to the main body, align screw holes, fit three screws and spring washers and tighten. Test that the float is moving freely in the chamber by rotating the whole unit around the float pin axis and listen for the movement of the float.
 10. Clean and then replace the filter in the float chamber lid, using a new aluminium washer, refit plug and tighten.
 
Float replacement in lid
A—Float held against face of lid with steel rule or feeler gauge
B—Stirrup on float needle
C—Float
D—Float needle
E—FIoat chamber lid

Float replacement in body
A—Plug and washer retaining nylon filter
B—Nylon filter
C—Screw and washer fixing float chamber lid
D—Float chamber lid
E—Float
F—Ensure hinge pin falls into recesses of body