Compression Check: Testing and Inspection
Compression, Checking
Special tools, testers and auxiliary items required
• Hose Clamps Up to 25 mm Diameter (3094)
• Spark Plug Removal Tool (3122 B)
• Compression Tester (V.A.G 1763)
• Puller (T40039)
Procedure
• Engine oil temperature min. 30 °C
• Battery voltage min. 12.5 V.
- Switch off ignition.
- Disconnect electrical connector at Engine Speed (RPM) Sensor (G28) - arrow - at left of transmission by bending heat shield to side slightly.
- Remove cover - 1 - in engine compartment (left side).
- Clamp off coolant hose - 2 - using Hose Clamps Up to 25 mm Diameter (3094) and disconnect from coolant expansion tank.
- Seal the connection using a plug that fits.
- Remove coolant expansion tank - arrow -.
- Disconnect electrical wire from Engine Coolant Level (ECL) Warning Switch (F66) at bottom on coolant reservoir and set aside coolant reservoir with coolant hose - 1 - connected.
- Remove oil dipstick - 1 - from guide tube.
- Remove bolts - 2 - and - 3 -.
- Disconnect electrical harness connectors at ignition coils.
- Press electrical wiring harness to side.
- Remove the bolts - arrows -.
- Remove the air duct - 1 - and - 2 -.
- Remove the bolts - 1 - and - 2 -.
- Disconnect electrical harness connectors at ignition coils.
- Press electrical wiring harness to side.
- Remove all ignition coils using Ignition Coil Puller (T40039).
- Using Spark Plug Removal Tool (3122 B), remove spark plugs.
- Check compression using Compression Tester (V.A.G 1763 ).
• Using tester => operating instructions.
- Have a second technician press accelerator pedal completely and at the same time operate starter long enough until pressure increase no longer appears on tester.
- Repeat procedure on each cylinder.
Assembling
Assembly is in reverse order of removal, note the following:
- Install the spark plugs.
- The engine control modules have stored a fault because the connectors were disconnected. Perform "generate readiness code" in " Guided Functions".
Tightening Specifications
