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Cylinder Leakage Test > < Coolant in Engine Oil

Astra J

Engine Compression Test

Special Tools

•  EN-46783   Thread Adapter
•  EN-46791   Adapter, Compression Tool

For equivalent regional tools refer to Special Tools .

Removal Procedure

1. Remove the fuel injection fuel feed pipe. Refer to Fuel Injection Fuel Feed Pipe Removal - Fuel Rail to Fuel Injector .
2. Remove the fuel injector. Refer to Fuel Injector Removal .

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3. Clean the injector sealing surfaces in the cylinder head using EN-47632   cleaning tool (1) in following procedure:
  •  first take the brush side to loosen the dirt.
  •  second take the sponge side to remove the dirt.

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4. Remove the front compartment fuse block cover (1).
5. Remove the fuel pump relay.

Compression Test Cylinder 1


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Note:  EN-46791   adapter can only be installed in pairs along with the fuel injector (cylinder 1 and 2 or cylinder 3 and 4).
1. Install EN-46791   adapter (1) with fuel injector (2) and fuel injector bracket in cylinder 1 with a NEW fuel injector gasket.
2. Install fuel injector spherical washer
3. Install fuel injector conical washer

Caution: Refer to Fastener Caution .
4. Install fuel injector bracket nut and tighten to 20 N·m (15 lb ft) .
5. Install EN-46783   thread adapter (3) to EN-46791   adapter (1).

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Note:  Use a compression plotter with a measuring range of 10-40 bar (145- 580 PSI).
6. Install compression plotter to EN-46783   thread adapter .
7. Connect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection .
8. Check the compression of cylinder 1.

Note:  A second technician is required.
  Start engine for approximate 4 seconds.

Note:  Engine speed at least 200 RPM.
9. Remove EN-46791   adapter (1) from cylinder 1.

Compression Test Cylinder 2


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Note:  EN-46791   adapter can only be installed in pairs along with the fuel injector (cylinder 1 and 2 or cylinder 3 and 4).
1. Install EN-46791   adapter (1) with fuel injector (2) and fuel injector bracket in cylinder 2 with a NEW fuel injector gasket.
2. Install fuel injector spherical washer.
3. Install fuel injector conical washer.

Caution: Refer to Fastener Caution .
4. Install fuel injector bracket nut and tighten to 20 N·m (15 lb ft) .
5. Install EN-46783   thread adapter (3) to EN-46791   adapter (1).

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Note:  Use a compression plotter with a measuring range of 10-40 bar (145- 580 PSI).
6. Install compression plotter to EN-46783   thread adapter .

Note:  A second technician is required.
7. Check the compression of cylinder 2.

Note:  Engine speed at least 200 RPM.
8. Start engine for approximate 4 seconds.

Note:  A second technician is required.
9. Check the compression of cylinder 2
10. Remove EN-46791   adapter (1) from cylinder 2.

Compression Test Cylinder 3


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Note:  EN-46791   adapter can only be installed in pairs along with the fuel injector (cylinder 1 and 2 or cylinder 3 and 4).
1. Install EN-46791   adapter (1) with fuel injector (2) and fuel injector bracket in cylinder 3 with a NEW fuel injector gasket.
2. Install fuel injector spherical washer.
3. Install fuel injector conical washer.

Caution: Refer to Fastener Caution .
4. Install fuel injector bracket nut and tighten to 20 N·m (15 lb ft) .
5. Install EN-46783   thread adapter (3) to EN-46791   adapter (1).

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Note:  Use a compression plotter with a measuring range of 10-40 bar (145- 580 PSI).
6. Install compression plotter to EN-46783   thread adapter .
7. Check the compression of cylinder 3.

Note:  A second technician is required.
  Start engine for approximate 4 seconds.

Note:  Engine speed at least 200 RPM.
8. Remove EN-46791   adapter (1) from cylinder 3.

Compression Test Cylinder 4


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Note:  EN-46791   adapter can only be installed in pairs along with the fuel injector (cylinder 1 and 2 or cylinder 3 and 4).
1. Install EN-46791   adapter (1) with fuel injector (2) and fuel injector bracket in cylinder 4 with a NEW fuel injector gasket.
2. Install fuel injector spherical washer.
3. Install fuel injector conical washer.

Caution: Refer to Fastener Caution .
4. Install fuel injector bracket nut and tighten to 20 N·m (15 lb ft) .
5. Install EN-46783   thread adapter (3) to EN-46791   adapter (1).

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Note:  Use a compression plotter with a measuring range of 10-40 bar (145- 580 PSI).
6. Install compression plotter to EN-46783   thread adapter .
7. Check the compression of cylinder 4

Note:  A second technician is required.
  Start engine for approximate 4 seconds.

Note:  Engine speed at least 200 RPM.
8. Remove EN-46791   adapter (1) from cylinder 4.

Note:  Maximum pressure difference 1.5 bar (22 PSI).
9. Compare compression values from cylinder 1-4

Installation Procedure

1. Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection .
2. Install the fuel pump relay.

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3. Install the front compartment fuse block cover (1)
4. Install fuel Injector. Refer to Fuel Injector Installation .
5. Install fuel Injection fuel feed pipe. Refer to Fuel Injection Fuel Feed Pipe Installation - Fuel Rail to Fuel Injector .

Cylinder Leakage Test > < Coolant in Engine Oil