Compression, Checking: Procedure
- Engine oil temperature approximately 80 °C (176 °F)
- Battery voltage at least 12.5 V.
-- Remove the engine cover. Refer to ENGINE COVER, REMOVING AND INSTALLING .
-- Disconnect the connector on the Fuel Pressure Regulator Valve -N276- -2-.
-- In order to reduce the fuel pressure in the high pressure reservoir, start the engine briefly.
-- Remove all glow plugs. Refer to GLOW PLUG, REMOVING AND INSTALLING .
-- Install the : VAG1763/8 in place of the glow plug and connect the : VAG1763 .
Information on using the tester. Refer to the Operating Instructions.
-- Have a second technician operate the starter until the test stops showing an increase in pressure.
-- Repeat the procedure on each cylinder.
| Compression Pressure | Pressure |
|---|---|
| New | 25.0 to 31.0 bar (362.59 to 449.617 psi) |
| Wear limit | 19.0 bar (275.57 psi) |
| Maximum difference between cylinders | 5.0 bar (72.51 psi) |
Assembling
Assemble in the reverse order of removal. Note the following:
-- If the connectors were disconnected and the engine was started, then malfunctions have been stored in the engine control module DTC memory. Use the Vehicle Diagnostic Tester.