Table 8. Amount Of Pressure That Is Required To Check The Wastegate Valve

TM 9-2320-312-24-2

Testing and Adjusting Section

As the boost pressure increases against the

Table 8

diaphragm in canister (2), the wastegate valve

Amount Of Pressure That Is Required To

opens. The rpm of the turbocharger becomes

Check The Wastegate Valve

limited. This limitation occurs because a portion of

Letter

the exhaust gases bypass the turbine wheel of the

kPa

psig

Designation

turbocharger.

156

(23)

The following levels of boost pressure indicate a

153

(22)

problem with the wastegate valve:

124

(18)

Too high at full load conditions

130

(19)

Too low at all lug conditions

135

(20)

180

(26)

The Technical Marketing Information (TMI) provides

the correct pressure for the inlet manifold.

144

(21)

188

(27)

To check the operation of the wastegate valve,

verify the correct pressure for the wastegate valve.

200

(29)

This can be accomplished by referring to the letter

161

(23)

designation that is stamped on the actuating lever

of the wastegate valve. This letter designation

164

(24)

indicates a corresponding amount of pressure.

The boost pressure controls the maximum rpm of the

Note: Refer to Table 8 for the letter designation and

turbocharger, because the boost pressure controls

the corresponding amounts of pressure.

the position of the wastegate. The following factors

also affect the maximum rpm of the turbocharger:

Remove the air line, and slowly apply the

corresponding amount of pressure to the canister.

Engine rating

DO NOT EXCEED 200 kPa (29 psi).

Horsepower demand on the engine

When the external supply of air that is connected

to line (3) reaches the corresponding pressure for

High idle rpm

the wastegate valve, the actuating lever should

move by 0.50 0.25 mm (0.020 0.010 inch). If

Height above sea level for engine operation

the actuating lever does NOT move by this amount,

replace the turbine's housing assembly of the

Inlet air restriction

turbocharger. This housing assembly includes the

wastegate valve. If necessary, replace the complete

Exhaust system restriction

turbocharger.

Note: The housing assembly for the wastegate

NOTICE

turbine is preset at the factory and no adjustments

If the high idle rpm or the engine rating is higher than

can be made.

given in the Technical Marketing Information (TMI) for

the height above sea level at which the engine is oper-

ated, there can be damage to engine or to turbocharg-

er parts. Damage will result when increased heat and/

or friction due to the higher engine output goes beyond

the engine cooling and lubrication system's abilities.