Checking the compression in the cylinders (Skoda Fabia 6Y)

Compression and the difference in its values between cylinders shows the degree of engine wear. It is better to measure compression at a service station.

Determining the degree of engine wear by compression

Engine	Compression, MPa
Engine	New engine	Wear limit	Maximum permissible difference in values in cylinders
Petrol 1.0 l, 37 kW and 1.4 l, 50 kW	not less than 1.2	0,75	no more than 0.3
Diesel 1.9 l, 74 kW	2,5 – 3,1	1,9	no more than 0.5

1. Remove the upper engine cover (see subsection 2.1).

2. For 1.0 l, 37 kW and 1.4 l, 50 kW petrol engines, disconnect connector 1 with wires from ignition module 2, unscrew the spark plugs (see subsection 10.3.3) and remove fuse #35 from the fuse box.

3. For a 1.9 L, 74 kW diesel engine, disconnect the unit injector wiring harness connector from the wiring harness, remove the glow plugs and screw in a special adapter instead of the glow plugs.

4. Connect a compression gauge.

5. Turn the engine over with the starter until the pressure on the instrument scale stabilizes. In this case, for a gasoline engine, you need to press the accelerator pedal all the way down.

6. Similarly, check the compression in the remaining cylinders.

7. Disconnect the compression gauge and install all removed parts.

8. Clear the engine control unit fault memory.

Tightening torques, Nm

Engines 1 l, 37 kW and 1.4 l, 50 kW:
– connecting rod bolt for 1.0L engine	20, turn 90°
– connecting rod nut for 1.4L, 50 kW engine	40
– bolt for fastening the main bearing cap housing of the 1.4 l, 50 kW engine	75
– rear oil seal holder mounting bolt	8
– flywheel mounting bolt	30, turn 90
– bolt for fastening the heat-insulating screen	5
– knock sensor mounting bolt	20
– bolt securing the oil pump receiver to the cylinder block	8
– crankshaft pulley mounting bolt	100
– timing gear cover mounting bolt	5
– camshaft gear mounting bolt	25
Engines 1.4 l, 55 and 74 kW:
- connecting rod bolt	20, turn 90°
– bolt for fastening the receiver to the oil pump	10
– bolt for fastening the receiver to the cylinder block	10
– knock sensor mounting bolt	20
– clutch disc mounting bolt	60, turn 90°
– oil pump mounting bolt	12
– generator bracket mounting bolt	50
– tensioner mounting bolt:
• M8	20, turn 90°
• M10	45
– oil pan mounting bolt	13
– oil drain plug	30
– tension roller mounting nut	45