Attention: The following describes the adjustment on a 90 hp engine. (designation JN). Different adjustment points for other engines are relegated to the end of the chapter.
When working with engines of 113 and 115 liters. With. a device is needed to determine the averaging factor (the ratio of a long pulse to the duration of the interval between two adjacent pulses) (or related duty cycle). The averaging coefficient characterizes the control signal for the idle speed stabilization valve. The larger the averaging factor, the more the valve opens.
Check conditions: Exhaust system must be tight
Warm up the engine. Oil temperature is about 80°C
Turn off all electrical consumers, including the air conditioner.
If injection lines have been opened or replaced, the engine speed must be increased to 3000 rpm several times before checking, at intervals of at least 2 minutes at idle.
Check lambda control.
Check ignition timing.
Clamp hose for idle speed regulator with clamp -1-.
Only for 90 hp engine: Detach crankcase breather hose -2- at cylinder head and lay it down so that fresh air can be drawn in. If the hose is secured with a wire clamp, use special pliers HA2ET 798-48.
Remove the cap from the top of the activated charcoal box.
Attention: Connect measuring instruments only when the ignition is switched off.
Connect the tachometer according to the instruction manual.
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