Contents: Adjusting the air damper diaphragm ↓ Adjusting the diaphragm of the air…↓ Adjusting the air damper drive cable ↓ Fast Idle Adjustment ↓ Adjusting the quality of the mixture…↓
Attention! The described adjustments are performed on the engine. The order of adjustments during carburetor assembly is specified in the instructions included with the repair kit.
Adjusting the air damper diaphragm
1. Start the engine.
2. At idle, disconnect the vacuum hose between the carburetor and the vacuum distributor (1 - move here, 2 - vacuum distributor, 3 - choke diaphragm).
3. The air damper diaphragm rod should quickly return to its original position under the action of the spring.
4. After connecting the hose, the rod should retract within 5-15 seconds (1 - connect at this point).
Adjusting the diaphragm of the air damper opening device
1. Start the engine when the coolant temperature is no higher than 5°C.
2. Disconnect and reconnect the hose on the diaphragm.
3. Make sure the diaphragm rod remains stationary.
4. After the engine has warmed up, disconnect the hose on the diaphragm, the diaphragm rod should return to its previous position (the arrow indicates the point of attachment).
5. Connect the hose – the valve should open slightly under the action of the vacuum in the diaphragm.
Adjusting the air damper drive cable
1. Remove the air filter and pull the choke cable handle all the way out until the choke is completely closed.
2. Push the handle away from you – the damper should open completely.
Fast Idle Adjustment
1. Warm up the engine to normal operating temperature, turn off the ignition and remove the air filter.
2. Close the air damper completely.
3. Disconnect the vacuum hoses from the ignition distributor and plug them.
4. Disconnect the vacuum hoses from the S port of the vacuum distribution valve and plug them.
5. Connect the tachometer and set the fast idle speed to 1800 rpm (the speed adjustment screw is indicated).
6. Open the air damper – the idle speed should drop to normal.
Adjusting the quality of the mixture at idle speed
Attention! Check the ignition setting, the condition of the distributor cap and rotor, spark plugs and high-voltage wires. Make all adjustments. As a rule, a violation of the normal mixture composition is associated with air suction.
1. Warm up the engine and remove the air filter.
2. Turn the idle speed adjustment screw out until the engine starts to run rough (the throttle valve must be fully closed).
3. Tighten the mixture quality adjustment screw until the engine speed noticeably drops, then loosen the screw until the speed increases to maximum.
Attention! If before adjusting the mixture quality to maintain engine operation it was necessary to screw the idle speed adjustment screw in instead of out, check the idle speed and repeat the mixture quality adjustment. This ensures that the mixture composition is set with the throttle valve fully closed.
[The official source is on the portal: www.ToyotaMAN.ru]