Compression Pressure, Checking: Procedure

WARNING: This page is about a different car, the 2014 Volkswagen Touareg, 2013 Volkswagen Touareg, 2012 Volkswagen Touareg, and 2011 Volkswagen Touareg. However, it is still accessible from the selected car via links, so may be relevant.

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 connectors on the glow plugs.

-- Disconnect the connector on the Fuel Pressure Regulator Valve -N276- -1- on the cylinder bank 1 (right) high pressure reservoir.

Fig 1: Identifying Connector From Fuel Pressure Regulator Valve -1-

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- In order to reduce the fuel pressure in the high pressure reservoir, start the engine briefly.

Fig 2: Identifying Socket 3320 To Remove Glow Plugs

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-- Remove the glow plugs. Refer to GLOW PLUG SYSTEM .

-- Install the Compression Tester Kit - Adapter 8:VAG1763/8 instead of the glow plugs and connect the Compression Tester:VAG1763 .

Fig 3: Identifying Adapter V.A.G 1763/8 And Compression Tester V.A.G 1763

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

NOTE:

For information on using the tester. Refer to the Operating Instructions.

-- Have A Second Technician Operate The Starter Until The Tester Does Not Show The Pressure Increasing Any Further.

Compression Pressure	Pressure
New	28 to 33 bar (406.1 to 478.62 psi)
Wear limit	21 bar (304.57 psi)
Difference between cylinders	Maximum 5

Install in reverse order of removal. Note The Following:

-- Install the glow plugs. Refer to GLOW PLUG SYSTEM .

-- Check the engine control module DTC memory and erase it to clear any faults stored from disconnecting the connectors using the Vehicle Diagnostic Tester.