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Carburetor Instruction Sheets  

  • Tillotson - HR

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

Tillotson HR

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.

image 2

 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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Winderosa Dist. & Mfg. Co. Inc. USA          Maine USA  FAX:  207-562-4446