| Nissan Engine >> RECESSED INTAKE VALVE SEATS |
Recessed Intake Valve Seats On
1990-91 Nissan 3.0L VG30E Engines
AERA members have reported valve seat recession on 1990 Nissan 3.0L VG30E engines. Symptoms include intermittent misfire, hard starting and lack of
power. In most instances this recession is noticed during the 60-80,000 mile period.
Diagnosing these symptoms using cranking compression tests has proved to be inconclusive, as successive tests have shown different results. Cold and hot
engine temperatures also exhibit varying symptoms as the engine warms up and valves do not fully close.
The reported cause of this condition is an unseated intake valve, resulting from valve seat recession. Apparently the valve seat alloys used during 1990-91
model year were not properly comprised. The earlier and later engines do not seem to exhibit this condition.
To repair this type of condition properly, replacement of all intake valve seats and usually all intake valves is necessary.
The AERA Technical Committee
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