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Carburetor Instruction Sheets  

  • Tillotson - HD

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

HD

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

HD image 
            2

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