4 manual Fit a compression manual tester to opel the No 1 cylinder spark astra plug hole astra - the type of tester which screws into the plug thread is best.
11 A low reading from two adjacent cylinders is almost certainly due to the head gasket having blown between them; the presence of coolant in the engine oil will confirm this.
If this is the case, the cylinder head should be removed and decarbonised.
14 On completion of the test, refit the spark plugs and reconnect the ignition system.A low compression reading on manual the first stroke, which does not build up during successive strokes, indicates manual leaking valves or a blown head gasket (a cracked head could also be the cause).Refer to a Vauxhall manual dealer or other specialist if in doubt as to whether a particular pressure reading is acceptable.Put a teaspoonfull of clean oil into that cylinder through its spark plug hole, and repeat the test.Note that the compression should build up quickly in a healthy engine; low compression on the first stroke, followed by gradually increasing pressure on successive strokes, indicates worn piston rings.2 The engine must be fully warmed-up to normal operating temperature, the battery must be fully charged, and all the spark plugs must be removed (Chapter 1).6 Repeat the test on the remaining cylinders, recording the pressure in each.10 If the addition of oil temporarily improves the compression pressure, this indicates that bore or piston wear is responsible for the pressure loss.12 If one cylinder is about 20 percent lower than the others and the engine has a slightly rough idle, a worn camshaft lobe could be the cause. 5 Have the assistant hold the throttle wide open, and crank the engine on the starter motor; after one or two revolutions, the compression pressure should build up to a maximum figure, and then stabilise.
If the test is performed black regularly, it can give warning of trouble before any other symptoms become gary apparent.No improvement suggests that leaking or burnt valves, or a blown head gasket, may be to blame.Use a jumper lead or similar wire to make a good connection.Deposits on the undersides of the valve heads can also cause low compression.8 Although Vauxhall do not specify exact compression pressures, as a guide, any cylinder pressure of below 10 bars can be considered as less than giappichelli healthy.The aid of an assistant will also be required.1 When engine version performance computer is down, or if misfiring occurs which cannot be attributed to the ignition or fuel systems, a compression test can provide diagnostic clues as to the engine's office condition.7 All cylinders should produce very keyer similar pressures; a difference of more than 2 bars between any two cylinders indicates a fault.13 If the compression reading is unusually high, the combustion chambers are probably coated with carbon deposits. 3 Disable the ignition system by disconnecting the ignition HT coil lead from the distributor cap and earthing it on the cylinder block.
9 If the pressure in any cylinder is low, carry out the following test to isolate the cause.
Record the highest reading obtained.
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