Carburetor Instruction
Sheets
INSTRUCTION SHEET
TILLOTSON™ CARBURETOR - MODEL HR
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: 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. NEEDLE - IDLE ADJUSTING
3. CUP - IDLE
ADJUSTING
NEEDLE
4. SPRING -
IDLE ADJUSTING
NEEDLE
5.WASHER - IDLE
NEEDLE
SPRING
6. O-RING - IDLE NEEDLE
7. NEEDLE - HIGH
SPEED ADJUSTING
8. SPRING - HIGH
SPEED
ADJUSTING NEEDLE
9. WASHER -
HIGH SPEED
NEEDLE SPRING
10. O-RING
HIGH SPEED
NEEDLE
11. SCREW - FUEL
STRAINER COVER
12. COVER -FUEL STRAINER
13. GASKET - FUEL
STRAINER
14. SCREEN - FUEL
STRAINER
- TYPE 1 -
15. SCREW &
LOCKWASHER
(6) FUEL PUMP BODY
16. BODY - FUEL PUMP
17. DIAPHRAGM (VALVE)
-FUEL PUMP
18. DIAPHRAGM (PULSE)
-FUEL PUMP
19. GASKET - FUEL PUMP
- TYPE 2 -
20.
SCREW & LOCKWASHER (6)
- INLET VALVE BODY
21.
BODY - INLET VALVE
22. DIAPHRAGM - INLET VALVE
23.
GASKET - INLET VALVE
24. BODY - FUEL PUMP
25.
DIAPHRAGM - FUEL PUMP
26. GASKET - FUEL PUMP
27.
COVER - DIAPHRAGM
28. DIAPHRAGM
29. GASKET -
DIAPHRAGM
30. SCREW - LEVER
FULCRUM PIN
RETAINER
31. PIN - LEVER FULCRUM
32. LEVER - INLET
CONTROL
33. SPRING - INLET LEVER
TENSION
34. NEEDLE, SEAT & GASKET
ASSEMBLY
35. WELCH PLUG - IDLE
PORT
36. WELCH PLUG - NOZZLE
CHECK VALVE
37.
VALVE - NOZZLE CHECK
38. WELCH PLUG -
ECONOMIZER CHECK
BALL
(SOME MODELS)
39. BALL - ECONOMIZER CHECK
(SOME
MODELS)
40. BODY - MAIN CARBURETOR
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 OFOBSCURE 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 - NSTALL 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 INSTALL GASKET AND SEAT
THEN TIGHTEN TO 40-50 INCH LBS. OF TORQUE . INLET
CONTROL LEVER SETTING TO ADJUST BEND TANG.
CAUTION: DO
NOT EXERT PRESSURE ON RESILIENT NEEDLE
VALVE. INLET CONTROL LEVER SHOULD BE FLUSH WITH THE
METERING CHAMBER WALL. IDLE NEEDLE INSTALLATION - TURN
NEEDLE (2) 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 NEEDLE INSTALLATION - TURN NEEDLE (7) IN LIGHTLY
UNTIL SEATED, THEN BACK OUT 1 TURN. 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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