Central section

CENTRAL SECTION

REMOVAL/REFITTING

• Remove the front section of the exhaust pipe (see specific procedure).

1. Loosen the clamp securing and remove the central section.

1. 1 Clamp

REAR SECTION

REMOVAL/REFITTING

1. Loosen the clamp securing the rear section of the exhaust pipe to the central section.

1. 1 Clamp

• Unscrew the screws securing the brake piper support bracket and the handbrake cable.
• Unscrew the screw securing the exhaust pipe rear elastic support to the body and remove it.

1. 1 Screw
2. 2 Screw
3. 3 Screw

CHECK SMOKE LEVEL AT EXHAUST

• Start up the engine and bring to a normal running temperature.

1. Insert the exhaust gas drawing pipe of the opacimeter in the end section of the exhaust pipe.

1. 1 Opacimeter

• Make all the necessary connections and adjust the equipment in accordance with the procedures indicated by the manufacturer.
• Press the accelerator down fully three times until the maximum power speed is reached or until the revs limiter intervenes.
• Take the measurements after five consecutive cold accelerations and record the maximum values.
• To obtain the test value, calculate the arithmetic average of the three values closest together.

NOTE: Where there is more than one set of three values suitable, choose the one which gives the highest average value.

• Check that the smoke level falls within the prescribed values.

• If the smoke level value at the exhaust is greater than the prescribed value, the following checks should be carried out:

• check condition of air filter;
• check timing of injection pump;
• check valve clearance and setting of timing;
• check setting and clean injectors;
• check compression ratio.

• If, regardless of the above checks, the smoke level remains outside the prescribed limits, the injection pump must be overhauled.