What torque is specified for the choke chamber screws?

2.0 - 5.9 N·m (0.20 - 0.60 kg-m, 1.4 - 4.3 ft-lb).

What is the torque for the automatic choke heater bimetal cover screw?

1.5 - 3.9 N·m (0.15 - 0.40 kg-m, 1.1 - 2.9 ft-lb).

What torque applies near the fuel needle valve / accelerating pump piston?

8.8 - 17.7 N·m (0.90 - 1.8 kg-m, 6.5 - 13.0 ft-lb).

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Nissan Micra Carburetor Choke Chamber Exploded Diagram & Torque Specs EF&EC-11

Carburetor choke chamber exploded parts diagram with torque specs, Nissan EF & EC manual

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Exploded view of carburetor choke chamber: choke chamber, vacuum break diaphragm, accelerating pump, throttle opener servo, fuel needle valve with N-m torque callouts.

AI caption June 2005 · Photo 111 of 412

This is a page from a Nissan factory service manual, section EF & EC (Engine Fuel & Emission Control), page EF & EC-11, covering the carburetor. It presents an exploded parts diagram of the choke chamber parts, identifying components including the choke chamber, vacuum break diaphragm, automatic choke heater bimetal cover, throttle opener servo diaphragm, fuel needle valve parts, accelerating pump lever, and accelerating pump piston. Torque specifications are given in N·m (kg-m, ft-lb): 2.0 - 5.9 (0.20 - 0.60, 1.4 - 4.3) for the choke chamber screws; 1.5 - 3.9 (0.15 - 0.40, 1.1 - 2.9) for the bimetal cover screw; 2.5 - 5.9 (0.25 - 0.60, 1.8 - 4.3) for the accelerating pump lever screw; and 8.8 - 17.7 (0.90 - 1.8, 6.5 - 13.0) for the fuel needle valve/pump piston area. A second view ("Arrow A", viewed from underneath per the arrow callout) shows locations of the primary slow air bleed, secondary slow air bleed, and accelerating pump piston. Illustration reference code SEF046D appears at the bottom. Useful for anyone disassembling or reassembling the choke chamber of the carburetor with correct fastener torques.

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Frequently asked questions

What torque is specified for the choke chamber screws?: 2.0 - 5.9 N·m (0.20 - 0.60 kg-m, 1.4 - 4.3 ft-lb).
What is the torque for the automatic choke heater bimetal cover screw?: 1.5 - 3.9 N·m (0.15 - 0.40 kg-m, 1.1 - 2.9 ft-lb).
What torque applies near the fuel needle valve / accelerating pump piston?: 8.8 - 17.7 N·m (0.90 - 1.8 kg-m, 6.5 - 13.0 ft-lb).
What parts are labeled in the choke chamber exploded view?: Choke chamber, vacuum break diaphragm, automatic choke heater bimetal cover, throttle opener servo diaphragm, fuel needle valve parts, accelerating pump lever, and accelerating pump piston.
What does the Arrow A view show?: The underside view (Arrow A) shows the primary slow air bleed, secondary slow air bleed, and accelerating pump piston locations.