Throttle Body: Adjustments

ADJUSTMENT OF THROTTLE BODY AND PULLEY





Adjustment of Throttle Body
^ Disconnect link.
^ Remove Throttle Body (TB) from intake manifold.
^ Remove Throttle Position (TP) Potentiometer from TB.
^ Clean TB carefully.





^ Slacken adjusting screw so that throttle closes fully.





^ Slacken throttle disc mounting screws slightly.

NOTE: Check that disc is correctly installed i.e. is facing in the right direction. Since edge of disc is thin, careful inspection is necessary to see chamfered edge.





^ Open throttle about one-third using throttle lever.
^ Release throttle lever quickly so that throttle disc centres itself in throat of opening. Hold TB against light and check that gap is even all round.
^ Check that throttle spindle can be moved backward and forward with slight resistance. Adjust spindle until end projects 13.85mm ± 0.3mm (0.55in ± 0.15in) beyond TB as illustrated.
^ Tighten throttle disc mounting screws to 0.8 - 1.0 Nm (0.59 - 0.74 ft lb).

NOTE: Specified maximum dimension of 13.85mm ± 0.3mm (0.55in ± 0.15in) must not be exceeded, otherwise spindle may bottom against TP potentiometer.





^ Screw in adjusting screw until it is just in contact with lever.
^ Screw in a further quarter turn.
^ Tighten locknut.





^ Mount TP potentiometer on throttle spindle.
^ Insert and tighten switch mounting screws.


NOTE: TP potentiometer is not adjustable.





^ Mount TB on intake manifold.
^ Reconnect all hoses and leads.





Adjustment Of Link
^ Slacken link locknut (A) sufficiently to permit link to be separated and to spring back easily to innermost position.
^ Mount link in position.
^ Check that throttle spindle is in contact with adjusting screw (B) and that pulley is seated against idling stop (C).
^ Tighten link locknut (A).
^ Rotate pulley to check that link seats against adjusting screw (B) before pulley seats against idling stop (C).





Check / Adjust Throttle Pulley And Cable
^ Pulley should move easily without sticking.
^ Lubricate with petroleum jelly if needed.
^ Cable should be taut in idling position but must not affect pulley position.
^ Pulley should seat against idling stop.
^ Adjust cable as required.
^ Press Accelerator Pedal (AP) to floor and check that pulley seats against full-load stop.