Engine Mechanical problem
1991 Nissan Sentra 4 cyl Front Wheel Drive Manual 227000 miles
Recently the crank seal and valve cover gasket started leaking. I replaced both.
Next time I drive it, the car is smoking (blue) and stumbling when shifting. Just as you let off the clutch and accelerate. It also pings about half the time just as it belches out a large cloud of smoke.
I've replaced the PCV valve and found the 2 vent hoses coming off the valve cover soaked in oil. Prior to changing the valve cover gasket these hoses were dry.
The car burns 1 quart in about 150 miles. Highway speeds no smoke is visible. From a stop, up through the gears it smokes (cloud larger than the car).
Prior to the crank seal and valve cover gasket, the car burned NO oil. Not a drop in the 227k miles before this. The car also just passed CA smog with no problems less than 1 month ago.
Any ideas? I replaced the seals around each sparkplug tube and the PCV valve. I tried 2 valves, one aftermarket, one from Nissan. The 2 vent hoses from the valve cover were reinstalled properly.
On the inside top of the valve cover is a baffle that separates the PCV vent and breather tubes from the valve train. This baffle is sealed around 3 of the 4 edges and takes up about 2/3rds of the area inside the cover. At one end there is a slight edge where I assume it lets the area " breath" through the PCV and other vent hose to the intake. Is there something above this baffle that could have dislodged and is no longer keeping the intake from drawing oil off the valve train? The baffle is riveted in place so there is no easy way to remove it.
Still getting 36-40 mpg even with 1 quart per 150 miles of driving!
This is the second crank seal I've put in it (original lasting 170k) and the first time the valve cover has been removed.
Tuesday, February 10th, 2009 AT 12:13 AM