NOTE: With this type of engine, checking the compression on a stationary vehicle is laborious. Therefore, it is advisable to check the idle speed setting before these works. Compression measurement is only advisable if a cylinder/cylinder failure is suspected.
Necessary special devices, control and measuring devices, as well as auxiliary means:
- torque wrench (5-50 Nm) V.A.G 1331;
- Adapter VAG 1381/12;
- Compressometer VAG 1763;
- Protective plate Т10247 (Vehicles with engine codes AYH, BKW);
- Connecting hose K4S 6278 (Vehicles with engine codes AYH, BKW).
Verification conditions
Engine oil temperature min. 30°C.
Ignition off.
Checking procedure
Drain the coolant.
On vehicles with engine codes AYH, BKW, remove the fuel filter.
Close the fuel hose connector with cover plate T10247 (pic. 2.15).
Connect fuel line A with connecting hose VAS 6278 to fuel line B (pic. 2.16).
On vehicles with BLE and BWF engines, remove the bypass cap with the recirculation cooler.
Continuation of assembly operations for all vehicles
Remove the top of the oil filter housing cover.
Remove glow plugs. Remove the right plenum box cover D (pic. 2.17).
Disconnect the small plug connection from the engine control units.
NOTE: By disconnecting the small plug connection, a condition is achieved under which, despite the starter running, the engine will not start. When the engine is started, errors will appear in the fault memory. After carrying out work on measuring compression, it is necessary to read and remove errors.
After measuring compression, interrogate the fault memory.
Screw adapter VAG 1381/12 into the glow plug socket of the cylinder to be tested.
Install the top of the oil filter housing cover.
Measure compression with a VAG 1763 compression gauge (pic. 2.18).
Crank the starter until the compression gauge stops increasing.
Compression readings
New: 25±0.31 barg.
Limit tolerance: 19 bar overpressure.
Permissible difference between individual cylinders: 5 bar.
Install glow plugs. Fill with coolant. After all cylinders have been checked and the engine is complete, interrogate the fault memory and clear the faults.
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