Bulletin 9D-5 August, 1951 Model
"AA" Page 8
ROCHESTER PRODUCTS DIVISION, GENERAL MOTORS CORP., ROCHESTER.
NEW YORK
DISASSEMBLY OF CARBURETOR
1. Remove cover and bowl assembly
from housing by removing 8 outside cover to housing-attaching screws.
2. Hold throttle in FULL open
position, to free pump actuating lever from pump yoke inside
of housing, then lift cover and bowl
assembly from housing.
3. Remove 6 bowl cover to bowl attaching
screws and separate bowl and cover by lifting straight up on cover to prevent damage to
float.
NOTE: Remove gasket and lay cover
aside for disassembly later.
4. With a 5/16" width screw driver, remove
power valve (K-Fig. 4) with red fibre gasket from bottom of bowl.
5. Remove 2 main metering jets (A-Fig. 3) from
bottom of bowl.
6. With use of a small pointed
object or small thin screw driver blade, remove retaining ring
and pump screen (A-Fig. 6)
from bottom of bowl.
7. Turn bowl upside down (top on palm of hand)
and the 2 main well tubes, (H-Fig. 3) 2 idle tubes (B-Fig. 2) and brass pump
outlet check valve (E-Fig. 6) should drop from bowl.
NOTE: A small wedge, may be used
to facilitate lifting main well tubes and idle tubes from
bowl.
8. With a small tag wire positioned into
outside hook of pump actuating spring, unwind spring three full turns—full relaxed
position. DO NOT DISTORT OR STRETCH PUMP ACTUATING SPRING.
9. Remove 5 pump housing attaching screws. Use
care so as not to disturb the position of the 2 pump jets, as they are targeted at
the factory for proper direction of gasoline discharge.
10. Remove conical-shaped pump return spring.
DO NOT REMOVE MAIN NOZZLES FROM BOWL.
11. Remove pump intake check valve plug and
"ball type" intake check valve (B-Fig. 6).
NOTE: Use a screw driver of
1/4" width to prevent damage to internal threads of pump well.
Disassembly of the Rochester Products Carburetor at this point permits
servicing one or all of the individual units. The following disassembly
procedure will cover the disassembly of each individual
unit.
