Weber Carburator Manual.pdf - Power by BMW E21

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Fig. 9.23 Au t omat ic , Choke valves 2 Adjustment screw cho ke minimum gep setting tOGA S t ypes} (Sec 9) Part 2 Weber carburetors Chapter 9 9-27 A Choke valve clearance 4 Tum the throttle valve idling adjust ing screw so that the engine runs at the recomm ended idling speed for the particular engine being worked on; this will be between 600 rpm and BOO rpm for touring models and approximately 1000 rpm for sports car models. 5 Turn the idle mixtu re adjustm ent screws in or out by equal amounts until the engine runs at th e highest rpm commensurate with even running. 6 Re-adjust the throttle valve adjusting screw , if necessary, to bring the engine speed w ith in limits. 7 Ideally a vacuum gauge should be used to make the adjustment described in paragraph 5. in wh ich case the mixture 11 Fault diag nosis Sym ptom Reasonls Fig, 9,24 Au t omat ic 1 Choke valves 2 Operating rod Engine will not sta rt Faulty automatic choke Siocked fue l filter or jets B-j c choke maximum gap setting tO GA S types} (Sec 9) 8 Choke valve clearance adjust ment screws are adjusted to give the maximum vacuum reading. S When the adjustment is comple ted. switc h off the engine and remove the tachometer and vacuum gauge if fitted, 9 On bypass idle ty pe carburetto re. the procedure is similar but the bypass idle adju stment screw should be fir st fully screw ed in, then screwed out 1 full tum. The basic idle adjustment is then made in th e normal way and the bypass idle adjustment used for any finai adjustment of speed. If an exhaust analyser is available, th e percentage of CO should be made on the basic idle adjustm ent, prior to making th e final speed adjustment on the bypass idle screw. Uneven idling l eaking carburettor flange or manifold gasket l oose idling jets or auxiliary ventu ns Excessive sediment or water in carburettor Throttle shafts and bearings or cerburettcr body excessively worn Faulty automatic choke leaking ignition advance tube Carburettor flood s Worn needie valve l eaking or damaged float assembly Incorrect float level adjustm ents Excessive sediment in fuel Engine lacks perfo rmance Incorre ct tuning adjust ments Incorrect f loat level adjustments Excessive sediment in fuel Faulty accelerati on pump Throttle valves do not fu lly open Excessive fuel consumption Needle valve not seating leaking or damaged float assemb ly .Incorrect float level adjust ments Faulty automatic chok e Choked air filte r
10-0 Part 2 Weber carburetors Chapter 10 Type 32 OFT, 32 OFTA, 32 OFTA1 Contents Sec tion Assembly • •..•.. ..•. ... • . • .. • . •. 7 Carburen or adjustments . . . . . . . . . . . 8 Construction ... • . •. •. . • . . . . . . . . . . . 2 Disassembly .• ... .• . •. • . .. . • . . . . . . . . 5 Fault diagnosis . . 10 Introduction . Operation . . . . . . . . • . • . • . • Removal and refitti ng •.• .• .. Special overhaul procedures . Tuning . Section , 3 4 6 9
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The Haynes Weber Carburetor Manual
Page 4 and 5:
Contents Introductory pages About t
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0-6 Safety first Regardless of how
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1 2 3 4 I I I I ( Fig . 1.4 The Web
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Part 1 Introduction Chapter 3 Maint
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Part 1 Introduction Chapter 4 Overh
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4-4 Part 1 Introduction Chapter 4 F
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4-6 Part 1 Introduction Chapter 4 F
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5-2 Part 1 Introduction Chapter 5 2
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5.2 layout of a com plete 44 IOF "P
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5-8 Part 1 Introduction Chapter 5 5
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PRECISION MOTORWORKS 930 East Orang
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IntToduetlon The Webe r 28/36 carbu
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5 Disassembly Thoroughly clean the
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5.2 3b The st art ing air and fuel
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6 Spec ial overhaul procedures Afte
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6-14 and for t his reason two small
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Adjustment data M anual choke types
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3 Disconnect the cho ke plate opera
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5.2 8 Withdrawing the automatic cho
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Fig. 7. ' 7 Location of the cerbuee
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7.66 The main carbur enor body read
Page 83: 8-0 Part 2 Weber carburetors Chapte
Page 95 and 96: 8-12 6.20 Accelerator pum p cover l
Page 97: 8-14 Part 2 Weber carburetors Chapt
Page 111 and 112: 9-6 Part 2 Webe r carburetors Chapt
Page 113: 9-8----
Page 116 and 117: 5.36 Withdraw ing the diaphragm rod
Page 118 and 119: 6.9 Needle valve seating tOGAS type
Page 120 and 121: 6. 17 Removing the accelerat or pum
Page 122 and 123: 6.4 7 Removing a throttle valve (DG
Page 124 and 125: Fig. 9 .17 Location of the e cctere
Page 126: 35 Fit the sealOC) and plug (101 Hn
Page 136: Part 2 Weber carburetors Chapter 10
Page 140 and 141: 5.2 Remo ving the fue l filter 5.4b
Page 143: 5.32a Removing an auxili ary ventur
Page 147 and 148: 10-14 Part 2 Weber carburetors Chap
Page 156 and 157: 5.2 Removing the fuel fil ter 5.5 L
Page 158 and 159: invert the carburettor and unscrew
Page 160 and 161: one is not available obtain the spe
Page 163: 7.16b Fitting a choke. show ing the
Page 167 and 168: 11-18 Part 2 Weber carburetors Chap
Page 177: 12-10 Part 2 Weber carburetors Chap
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Part 2 Weber carburetors Chapter 13
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------- - - ----------- - - - 13-3
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was her and clevis pin. 24 Note the
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hinge pin are cast to'Nard th e fro
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14-8 Part 3 Zenith Stromberg carbur
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Part 3 Zenith Stromberg carburetors
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The chamber is a die-cast aluminium
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- - - - ---- - 7.14 Removing the fl
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17-8 Part 4 SU carburetors Chapter
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6.13 Removing the hose co nnection
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HS6 HS8 7 Disa ssem b ly AUE812S AV
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19-6 7.12 Removin g the jet assembl
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9 Tuning Not e; Refer to ChiJpter 3
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20-4 5 1 Vacuum controlled air valv
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9.12 8 O- ring seal (arrow ed) on t
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11.16 Removing the ASU from the adp
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20-18--- ---- - - ------------- - -
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Part 4 SU carburetors Chapter 21 Au
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5.9 J et locat ion (arrowed) in the
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6_6 Removing t he hot air inlet stu
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i-----::c::-:;:========- 21·11 .-
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A2-2 Part 5 Appendix 2 Aust in A me
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Mai n meteri"ll nMdln for .09O j. t
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A4-8 Part 5 Appendix 4 Needle 81813
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AS-O Part 5 Appendix 8 Needle cross
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A8-2 Part 5 Appendix 8 PArt N.edle
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