Subaru Legacy BN/BS (2015-2019) Service Manual: Inspection

Subaru Legacy BN/BS (2015-2019) Service Manual / Cooling(h4do) / Thermostat / Inspection

1. Check that the thermostat does not have deformation, cracks or damage.

2. Check that the thermostat valve closes completely at an ambient temperature.

3. Immerse the thermostat and a thermometer in water. Raise water temperature gradually, and check the temperature and valve lift when the valve begins to open and when the valve is fully opened. Replace the thermostat if faulty.

NOTE:

• During the test, agitate the water for even temperature distribution.

• Leave the thermostat in the boiling water for five minutes or more before measuring the valve lift.

• Hold the thermostat with a wire or the like to avoid contacting with container bottom.

Starting temperature to open:

Engine side

90 — 94°C (194 — 201°F)

CVTF cooler (with warmer feature) side (CVT model)

48 — 52°C (118 — 126°F)

Full open temperature:

Engine side

100°C (212°F)

CVTF cooler (with warmer feature) side (CVT model)

63°C (145°F)

Total valve lift:

Engine side

8.0 mm (0.315 in) or more

CVTF cooler (with warmer feature) side (CVT model)

6.0 mm (0.236 in) or more

(A)

Thermometer

(B)

Thermostat

Removal

1. ENGINE SIDE1. Disconnect the ground terminal from battery sensor. NOTE2. Drain engine coolant. Engine Coolant > REPLACEMENT3. Remove the front exhaust pipe. Front Exhaust Pipe > REMOVAL4. Discon ...

Installation

1. ENGINE SIDE1. Install a gasket to thermostat.NOTE:Use a new gasket.2. Install the thermostat and thermostat cover.Tightening torque:6.4 N·m (0.7 kgf-m, 4.7 ft-lb)(A)Thermostat cover(B)Gasket ...

Other materials:

Basic diagnostic procedure procedure
1. ENGINESTEPCHECKYESNO1.CHECK ENGINE START FAILURE.1) Ask the customer when and how the trouble occurred using the interview check list. Check List for Interview > CHECK2) Start the engine.Does the engine start- Basic Diagnostic Procedure > PROCEDUREInspection using “Diagnostics for Engine S ...