Overboost Warning; Turbocharger Inspection; Inspection Of Compressor Wheel Assembly; Inspection Of Oil Passage - Mazda 626 MX-6 Workshop Manual

OVERBOOST WARNING

1. Start the engine and run it at 2,000 rpm.
2. Lift the air cleaner upper case, and push the meas­
uring plate open fully.
3. Check that the warning buzzer sounds and the en­
gine speed drops or engine stalls.
I
86U04B-047
TURBOCHARGER

Inspection of Compressor Wheel Assembly

1. Be sure the engine is cool.
2. Remove the air hose.
3. Check that the wheel assembly turns smoothly.
4. If there is excessive load or noise, replace the tur­
bocharger.
86U04B-048
Inspection of Turbine Wheel Deflection
1. Be sure the engine is cool.
2. Remove the air hose.
3. Check that the wheel does not touch the compres­
sor housing.
4. If the wheel touches the housing, replace the tur­
bocharger.
86U04B-049

Inspection of Oil Passage

1. Be sure the engine is cool.
2. Remove the oil return pipe.
3. Check that carbonized oil is not blocking the oil
passage in the turbocharger or the oil return pipe.
4. Replace the turbocharger and return pipe if
. necessary.
Carbonized oil
86U04B-050
TURBOCHARGING SYSTEM
4B
4B-53