Saturday, June 2, 2012

Subaru Oil pressure Gauge replacing?

How to replace oil pressure gauge.
How does it works and where it is located.

The details with help diagrams to replace oil pressure gauge is as follows:----

The oil pressure gauge switch monitors the oil pressure at the pump. Depending on the model, it is attached to the oil pump case (1.6L, 1.8L and 2.7L engines) or cylinder head (2.2L, 2.5L and 3.3L engines).

This sensor consists of a moving diaphragm which reacts according to the oil pump pressure, a temperature compensating bimetal, a heat wire and two contacts.

When no oil pressure is presents, the two contact points are open slightly. As oil pressure increases, the point arm begins to contact the bimetal. With the ignition switch ON, current flows to the heat wire in the sensor and begins to create heat which bends the bimetal and point arm in the sensor. As the bimetal in the sensor heats and bends, current is created which is transported through the sensor wire to the gauge, where it begins to heat a bimetal in the gauge. The bending bimetal moves the point arm in the gauge. As the oil pressure changes, it creates a different current flow and resulting generated heat to the bimetal in the sensor and gauge.

The oil pressure gauge switchin your case is attached to the back side of the Cylinder Head and looks like this.

oil pressure gauge

The oil pressure switch is attached to the lower part of the Cylinder Block on the back side also, and looks like this.
oil pressure switch

The procedure to replace oil pressure gauge is as follows:---


1. Disconnect the negative battery cable.
2. Access the oil pressure sensor on the oil pump case (1.6L, 1.8L and 2.7L engines) or cylinder head (2.2L, 2.5L and 3.3L engines). Unfasten the wire harness from the switch.
3. Place a suitable drain pan underneath the oil pressure sensor to capture any oil which may spill out during the removal and installation of the switch.
4. Use an appropriate wrench to loosen and remove the oil pressure sensor. If reinstalling original oil pressure sensor, remove and discard washer on sensor.

To install:

5. Position the oil pressure sensor and new washer into hole in oil pump case or cylinder head, depending on models, and hand-tighten.
6. Use an appropriate socket and tighten the pressure sensor to 12-17 ft. lbs. (17-23 Nm).
7. Fasten the wire harness to the oil pressure sensor.
8. Connect the negative battery cable.
9. Check the oil level and add if needed.

This details will help.

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