1.5.8.1. Carburetor models

Adjustment needs to be made on the hot engine. At the same time all electric consumers have to be switched off and the fan of a radiator should not work.

Idling turns

Prevention

On models turns of idling are run with PIERBURG carburetors by the block of electronics and cannot be adjusted manually.

Arrangement of adjusting screws of the STROMBERG carburetor
 1 – rod of the lever of a butterfly valve;
2 – adjusting screw of adjustment of rapid turnovers of idling;
3 – lever of a butterfly valve;
4 – screw of adjustment of turns of idling

PERFORMANCE ORDER
1. Connect a tachometer to the engine and check idling turns. Adjustment is made by turn of the screw of turns of idling (see rice. Arrangement of adjusting screws of the STROMBERG carburetor).
2. Quickly increase turns of the engine and then repeatedly measure idling turns.

Verification of the contents WITH

Adjustment of contents WITH
 For adjustment of contents WITH weaken a lock-nut (1) and rotate the fuel gate-type valve (2).

PERFORMANCE ORDER
1. Insert the analyzer of exhaust gases into an exhaust pipe.
2. Increase engine turns to 2 000 rpm for 15 seconds, then transfer the engine to the mode of turns of idling.
3. Check contents WITH in exhaust gases. For adjustment remove a cap from the fuel gate-type valve, weaken a lock-nut and, rotating the fuel gate-type valve, establish the required contents WITH (see rice. Adjustment of contents WITH).

The raised idling turns

PERFORMANCE ORDER
1. Start the engine in the idling mode. Check that turns of idling and maintenance WITH are correctly adjusted.
2. Manually open a butterfly valve that the engine worked at turns of 2 500 rpm. At the same time insert the small screw-driver into a groove from the casing of a butterfly valve available after removal of a plastic covering and move the engine lever to the engine before emergence of considerable resistance.
3. When fixing the lever of the engine the screw-driver release a butterfly valve. At the same time the engine has to work at the raised idling turns.
4. Using a tachometer, check the raised idling turns. For adjustment rotate the screw of turns of idling. The screw of the raised idling turns the shortest of two screws (see rice. Arrangement of adjusting screws of the STROMBERG carburetor).
5. In conclusion open quickly butterfly valve to disunite the mechanism of increase in turns of idling and to allow the engine to work at normal turns of idling.

Verification of the contents WITH on the raised idling turns

Arrangement of a cap of the auxiliary air adjusting screw

PERFORMANCE ORDER
1. Install the analyzer of exhaust gas in an exhaust pipe.
2. Establish the raised idling turns. Check contents WITH in exhaust gases. For adjustment remove a cap from the auxiliary air adjusting screw and, rotating the screw, establish the required contents WITH (see rice. Arrangement of a cap of the auxiliary air adjusting screw).
3. In conclusion quickly open a butterfly valve to uncouple the mechanism of the raised turns of idling and to allow the engine to work at normal turns of idling.