Carburetor Instruction
Sheets
INSTRUCTION SHEET
TILLOTSON™ CARBURETOR -
MODEL HD
GENERAL EXPLODED VIEW
THE GENERAL DESIGN AND PARTS
SHOWN WILL VARY TO
INDIVIDUAL UNITS COVERED ON THIS INSTRUCTION
SHEET
DISASSEMBLY
USE EXPLODED VIEW AS A GUIDE. THE NUMERICAL SEQUENCE MAY GENERALLY
BE
FOLLOWED TO DISASSEMBLE UNIT FAR ENOUGH TO PERMIT CLEANING AND
INSPECTION.
NOTE: SOME MODELS HAVE AN EXTERNAL FUEL PUMP WHICH IS REMOVED AS AN
ASSEMBLY.
EARLY MODELS HAVE A MAIN JET (14) WITH RIGHT HAND THREADS.
LATER MODELS HAVE LEFT HAND THREADS.
IF WELCH PLUGS ARE REMOVED, CAREFULLY DRILL THROUGH THICKNESS OF
PLUG,
USING A 1/8" DRILL. THEN PRY OUT WELCH PLUG, USING A SMALL PUNCH.
NOMENCLATURE
REF. NO.
1. PLUG SCREW - BODY
CHANNEL
2. SPRING - INLET SCREEN
RETAINER
3. SCREEN -
INLET
4. NEEDLE - IDLE
ADJUSTING
5. SPRING - IDLE ADJUSTING
NEEDLE
6. WASHER - IDLE NEEDLE
SPRING
7. O-RING - IDLE
NEEDLE
8. NEEDLE - HIGH SPEED
ADJUSTING
9. SPRING - HIGH SPEED ADJUSTING
NEEDLE
10. WASHER - HIGH SPEED NEEDLE SPRING
11.
O-RING HIGH SPEED NEEDLE
12. GLAND - HIGH SPEED
NEEDLE
13. GASKET - GLAND
14. JET -
MAIN
15. GASKET - MAIN JET
- TYPE 1 -
16. SCREW & LOCKWASHER (6) DIAPHRAGM
COVER
17. COVER - DIAPHRAGM
- TYPE 2 -
18. SCREW - FUEL STRAINER COVER
19.
COVER - FUEL STRAINER
20. GASKET - FUEL STRAINER
COVER
21. SCREEN - FUEL STRAINER
22. SCREW & LOCKWASHER
(6) - INLET VALVE BODY
23. BODY - INLET VALVE
24.
DIAPHRAGM - INLET VALVE
25. GASKET - INLET VALVE
26.
BODY - FUEL PUMP
27. DIAPHRAGM - FUEL PUMP
28.
GASKET - FUEL PUMP
29. COVER - DIAPHRAGM
30.
DIAPHRAGM
31. GASKET - DIAPHRAGM
32. SCREW - LEVER
PIN RETAINING
33. PIN - LEVER
34. LEVER - INLET
CONTROL
35. SPRING - INLET LEVER TENSION
36.
NEEDLE, SEAT & GASKET ASSEMBLY
37. WELCH PLUG - IDLE
PORT
38. WELCH PLUG - NOZZLE CHECK VALVE
39. WELCH
PLUG - ECONOMIZER
CHECK BALL
(SOME MODELS)
40. BALL - ECONOMIZER
CHECK
(SOME MODELS)
41. BODY - MAIN
CARBURETOR
42. GASKET - FLANGE
CLEANING
CLEANING MUST BE DONE WITH CARBURETOR DISASSEMBLED.
SOAK PARTS LONG ENOUGH TO SOFTEN AND REMOVE ALL FOREIGN MATERIAL.
USE
(1) A CARBURETOR CLEANING
SOLVENT,
(2)
LACQUER THINNER,
OR
(3)
DENATURED ALCOHOL.
MAKE CERTAIN THE THROTTLE BORE IS FREE OF ALL CARBON AND VARNISH
DEPOSITS.
RINSE OFF IN SUITABLE SOLVENT.
BLOW OUT ALL PASSAGES IN CASTINGS WITH COMPRESSED AIR AND
CHECK
CAREFULLY TO INSURE THOROUGH CLEANING OF OBSCURE AREAS.
CAUTION: DO NOT SOAK GASKETS OR RUBBER PARTS IN CLEANING SOLVENTS.
REASSEMBLY
REASSEMBLE IN REVERSE ORDER OR
DISSASSEMBLY.
NOTE SPECIAL INSTRUCTIONS AND ADJUSTMENTS.
SPECIAL INSTRUCTIONS
WELCH PLUG INSTALLATION - INSTALL PLUG WITH CONVEX SIDE UP.
THEN FLATTEN, USING A 5/16" FLAT END PUNCH AND HAMMER.
(CORRECTLY INSTALLED WELCH PLUG IS FLAT.)
INLET NEEDLE SEAT INSTALLATION - INSTALL GASKET AND SEAT THEN
TIGHTEN TO 40-50 INCH LBS. OF TORQUE.
TO ADJUST BEND
TANG
* CAUTION: DO NOT EXERT PRESSURE ON RESILIENT NEEDLE VALVE.
INLET CONTROL LEVER SETTING
to adjust bend tang
INLET CONTROL LEVER SHOULD BE
FLUSH WITH THE METERING CHAMBER WALL.
IDLE NEEDLE INSTALLATION - TURN NEEDLE (4) IN LIGHTLY UNTIL SEATED,
THEN BACK OUT 1 TURN.
HIGH SPEED NEEDLE INSTALLATION - TURN NEEDLE (8) IN LIGHTLY UNTIL
SEATED,
THEN
BACK OUT 1 TURN.
IDLE ADJUSTMENT - ENGINE AT OPERATING TEMPERATURE, ADJUST IDLE
MIXTURE SCREW TO OBTAIN A SMOOTH STEADY IDLE AND ADJUST IDLE
SPEED SCREW TO ENGINE MANUFACTURER'S R.P.M.
HIGH SPEED ADJUSTMENT - ENGINE AT FULLY OPEN THROTTLE AND UNDER
NORMAL FULL LOAD, ADJUST NEEDLE TO OBTAIN THE HIGHEST R.P.M.
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