Idiomas disponibles
Idiomas disponibles
• Wear approved eye protection. A full range of personal
protective equipment is available from your Würth dealer.
• Wear appropriate safety clothing, don't wear jewellery, and tie
your hair up.
• Make sure all unconnected fuel lines are closed to prevent leaks.
• Make sure the correct adapter is used for the engine being
tested.
• Always release the pressure from the pressure gauge before
disconnecting the quick coupling.
• Pay attention to all tools and parts used and don't leave them in
or near the engine.
• Remove the ignition key before working to prevent accidental
start-up.
• Be careful when testing hot engines. Hot exhaust manifolds and
other hot parts of the engine pose a burn risk!
• Diesel injection systems can generate very high pressures.
Therefore, don't disassemble or tamper with fuel lines that are
under pressure. This poses an injury hazard.
• Always follow the vehicle manufacturer's service instructions or an
approved manual to determine the required procedure and data.
Operating method and device description
Measuring compression pressure on a petrol engine
Prepare the compression tester for measurement by inserting a new
chart. To do this, press the feed button on the side (Fig. 1) until the
chart holder can be removed from the slot on the left. (Fig.2) Insert a
new chart as shown in Fig.3 and slide the diagram chart holder back
into the right slot on the tester. (Fig.4) If necessary, press the feed
button once. The correct position of the holder is reached as soon as
the needle is on the measuring scale (lower edge in the window) in
position "Cylinder 1".
1.
Apply the vehicle's handbrake, start the engine and let it run.
2.
Stop the engine as soon as the operating temperature is
reached
3.
Insert the new chart so that the pointer needle is on cylinder 1.
4.
Remove the spark plug and unscrew all the spark plugs. Start
the engine briefly so that any combustion residue can be
released.
5.
Deactivate the electronic ignition system (follow the
manufacturer's instructions).
6.
Fit the appropriate adapter in place of the spark plug (Fig. 7).
Note: If the spark plug thread corresponds to M14x1.25,
the test can also be performed directly in the original thread
(without adapter).
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7.
Press the brass head on the end of the compression tester tube
with the rubber nozzle into the spark plug hole or adapter
(Fig. 8) and fully open the throttle valve.
8.
Now turn on the engine with the help of the starter motor for
at least 4 seconds (about 10 revolutions) until the needle on
the pressure tester moves forward.
9.
To prepare for the next measurement, press the pressure relief
valve (Fig. 5 + 6) before moving the test chart to the position
of cylinder 2.
10.
Now repeat the test (steps 6 to 9) on all remaining cylinders.
Pressure relief valve
At the inlet of the device there is a slide valve (Fig. 5+6) for pressure
relief. This is necessary, for example, if a measurement is to be
repeated on the same cylinder. The device doesn't need to be
decoupled for this second measurement.
7-piece spark plug connection adapter set.
With the help of the spark plug adapter set (Fig. 7), access to the
combustion chamber is ensured through the hole in the spark plug.
The original spark plug helps you select the correct spark plug
adapter. Thread size and access to the engine/cylinder head are
vital when choosing the right adapter (short or long adapter).
To be able to perform the measurement, the brass head with the
rubber nozzle must be inserted directly into the internal thread of
the connection adapter and pressed down and held pressed during
the measurement. (Fig.8) There are 5 spare rubber pads supplied.
(Fig.9)
Interpreting test results
Take note of the information provided by the vehicle
manufacturer!
• If cylinders are intact, the pressure rises to its maximum value
immediately after starting.
• If all cylinders have been tested to manufacturing specifications,
the difference between them should not exceed 10%
• If there is no compression on a cylinder, the piston must be
checked for damage. Note: if the combustion temperature is too
high, e.g. uncontrolled combustion, it can damage the piston.
• If the value on two adjacent cylinders is lower than that of the
other cylinders, this indicates a defective cylinder head gasket in
the transition area of the two cylinders. In this case, the cylinder
must also be checked for residual water or oil.
• If the compression on a cylinder is lower than specified by the
manufacturer, add some oil to the combustion chamber and
recheck the compression. Significantly higher compression
measured indicates worn piston rings. If the compression doesn't
change, a valve could be damaged or there could be a defect
