Technical data

2003T Turbo Compressor

Where there is an excessive amount of smoke in the

exhaust fumes or the engine output is particularly low

it may be that the turbo is not functioning properly. If

the boat’s speed through the water is gradually de-

creasing, the boat’s bottom should also be inspected,

and cleaned where necessary. Check that the air in-

take has not become clogged, and clean the intake

silencer. Messure the supercharging pressure under

full load at 3200 rpm. The boost pressure should be

100 kPa – 120 kPa (14.5 – 17.4 psi) at 20°C (68°F).

NOTE! It is important to maintain full loading long

enough to enable the pressure to stabilise if results

are to be correct. Also note that the pressure varies

with the temperature of the intake air, as shown in the

diagram below. The supercharging pressure is given

at +20° (68°F), which implies that the measured

pressure must be corrected as shown in the diagram if

the intake air is not at this temperature when the

measurement is made.

1. Inspecting the Seals

Check the joints between the turbine housing and the

compressor bearing housing, and between the com-

pressor bearing housing and the compressor housing.

2. Checks

Check the pre-injection angle, the injector’s opening

pressure and the spray pattern. The valve clearance

and compression should also be checked.

Maximum permissible radial clearance: 0.17 mm

(0.00669 in).

If wear and tear has reached the maximum permissi-

ble the turbo-compressor should be reconditioned or

replaced.

Turbo compressor

Boost pressure at various pressures

A. Boost pressure measured

B. Correction graphs

C. Intake air temperature (IAT)

Example:

A pressure of 100 kPa recorded at 0°C is the

equivalent of 92 kPa at +25°C.

3. Checking axial and radial clearance

Dismount the turbo-compressor from the engine, and

measure the rotor unit’s axial and radial clearance.

Maximum permissible axial clearance: 0.09 mm

(0.00354 in)