Daewoo Nexia Quiz
Engine (Single Overhead Camshaft)

Compression Test

In this manual: Engine (Single Overhead Camshaft)
OWNER'S MANUAL — 12Vehicle Maintenance — 15Maintenance — 16Engine (Single Overhead Camshaft) — 50Engine (dual overhead camshafts) — 45Cooling System — 14Fuel and Exhaust Systems — 31Engine Electrical Equipment — 16Ignition System — 8Electronic Control Unit and Sensors — 12Clutch — 11Five-Speed Transmission and Final Drive RPO MM5 — 16Automatic Transmission — 46Wheels and Tires — 17Front Suspension — 13Front Axle Drive Shafts — 10Rear Suspension — 12Brake System — 54Body — 127Heating, Ventilation and Air Conditioning System — 21Electrical System — 7Wiring Diagrams — 25
~1min read

GENERAL INFORMATION.

Warning.

Disconnect the "BAT" terminal from the ignition module or distributor..

Cylinder compression is checked to determine the technical

condition of the piston rings and valve seating. Check compression with the throttle and air valves open and spark plugs removed.

ignition switch off and a fully charged battery. Compression in individual

cylinders should not differ greatly. The minimum pressure in the cylinders must be

not less than 689 kPa and at least 70% of the maximum value for all

cylinders. Take measurements on each cylinder during four compression

strokes.

Normal condition of piston rings and valves.

Pressure builds up quickly and evenly to the nominal value.

Worn piston rings.

On the first compression stroke the pressure is low; on subsequent strokes the pressure increases,

but does not reach the nominal value. When 20–25 ml of engine oil is added to the cylinders, compression increases noticeably.

Valves not seating properly.

On the first and subsequent compression strokes the pressure remains low. When engine oil

is added to the cylinders, compression does not improve significantly. To add oil to the

cylinders, use a piston-type oil injector.

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