911 SC Cabriolet F6-2994cc 3.0L SOHC (1983)
6. Tighten injector pressure line.
Checking Injectors
Note:
The injectors of one engine can be replaced separately.
Defective injectors cannot be repaired, but must be replaced.
Checking
Operate hand lever slowly (about 2 sec/stroke) with the pressure gauge shut-off valve open. In this manner a valve leaking because of a large particle
of dirt can be recognized (tight spray on valve, pressure built up to max. 1.5 bar)
Checking Opening Pressure
1. Flush injector with the pressure gauge shut-off valve closed by moving lever back and forth several times quickly.
2. Open pressure gauge shut-off valve and read opening pressure on pressure gauge while moving lever slowly (about 2 sec/stroke)
The opening pressure is:
15 to 18 bar (mechanical injection system)
2.5 to 3.6 bar (continuous fuel injection)
Replace injector, if opening pressure is outside of these tolerances.
Caution!
When pressure gauge shut-off valve is open increase pressure slowly to avoid damaging the pressure gauge.
Checking for Leaks
Mechanical Fuel Injection
1. Open shut-off valve on pressure gauge until the pressure on the pressure gauge has dropped below 15 bar.
2. Operate hand lever slowly until a pressure of 2.0 bar less than the measured opening pressure is reached.
No drops should form on the valve within 15 seconds when the pressure is 2 bar less than the opening pressure.
Continuous Fuel Injection