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Testing each cylinder
Run the engine until it reaches normal working temperature, then remove all the sparkplug leads. If there is a risk of getting the leads confused, label them.cfw oil seals quality excellent.
Remove the LT lead from the coil to avoid possible sparking at the plug caps. On a fuel-injection engine, disconnect the fuel-pump supply lead at the fuse.
Remove the plug leads by gripping the caps, not by pulling on the leads which may damage them. Label the leads if necessary to avoid confusion when re-fitting them.
Clean the area around the plug holes to prevent dirt getting into the engine. Remove the plugs with a plug spanner.
The reset button is on the handle – remember to reset the tester to zero before testing the next cylinder.cfw oil seals quality excellent.
The compression tester usually screws in although some models have a rubber plug.
A screw-in connector replaces the sparkplug.
A rubber plug connector is hand-held in the sparkplug hole
Ask a helper to press the accelerator pedal hard down to open the throttle fully, and to be ready to turn the ignition switch to crank the starter.
Remove a cylinder sparkplug and screw or push the connector of the compression tester into a sparkplug hole. If it has to be held in place, hold it firmly to avoid leaks.
Tell your helper to crank the engine for at least ten revolutions, or about six to eight seconds. Take care that loose clothing or hair does not get caught in belts or pulleys.
The pressure reading on the gauge.increases in steps, and may take up to ten revolutions to reach a maximum.
Note the pressure, and how many revolutions it took. Then test all the other cylinders, in the same way, noting the reading after the same number of turns.
The figures should be within 10 per cent of each other and of the maker’s figure if the engine is in good condition.cfw oil seals quality excellent.
Plugs may have a long reach or a short reach, the length of the thread from the plug body to the nose. A tester with a screw connector has an adaptor which should be fitted when inserting the connector into the socket of a long-reach plug
If one or more cylinders give a lower result than the others, a further test (described in the next column) shows whether the leakage is past worn piston rings or elsewhere.cfw oil seals quality excellent.