Volkswagen Workshop Service and Repair Manuals

Keihin carburettor 08.78▸=>page 22-59

Note:

• ◆ Adjusting screws are secured with caps, plugs and sealing paint so that adjustment is not possible without destroying the securing element. Always renew the securing element after carrying out repairs or adjustment.
• ◆ Lubricate all carburettor joints with MoS2 grease.
• ◆ Renew gaskets and seals on assembly.
• ◆ Hose connections are secured with screw-type or spring-type clips.

Top part carburettor

carburettor adjustment data =>page 22-47

Jets and settings =>page 22-48

Adjusting choke cable =>page 22-58

=> Repair group 26; Vacuum connections

• 5 Nm
• ◆ Tighten evenly
• ◆ secure with D 6
• Gasket
• ◆ Renew
• ◆ Watch hole pattern
• Float
• Float needle valve

Bottom part of carburettor

Note:

• ◆ Do not interchange the stage 1 and stage 2 emulsion tubes.

Jet arrangement in bottom part of carburettor =>page 22-49

• Idling cut-off valve
• ◆ Checking: must be heart to clip when the ignition is switch on and off
• Pilot air jet
• Pilot fuel jet
• Operating rod for accelerator pump
• Main jet, stage I

• Emulsion tube, stage I
• ◆ Holes at top
• Air correction jet, stage I
• Air correction jet, stage II
• Emulsion tube, stage II
• ◆ Holes at bottom
• Enrichment valve
• Retaining plate
• Main jet, stage II
• Stop lever
• ◆ Checking and adjusting cold idle speed =>page 22-53
• Throttle valve positioner
• ◆ Checking and adjusting =>page 22-55

• Idling adjustment screw
• ◆ Checking and adjusting idle speed: idle adjustment =>page 22-50
• Diaphragm
• ◆ For accelerator pump
• ◆ watch position
• Screw
• ◆ Secure witch D6
• CO adjustment screw
• ◆ Checking and adjusting CO content: Idle adjustment =>page 22-50
• Anti-tamper cap