Test Procedure; Test Result - BGS technic 62660 Manual De Instrucciones

TEST PROCEDURE

1. Warm the engine to operating temperature, check the status of the battery and check the start
speed. The speed of starting is very important for the compression test!
2. Stop the engine and remove fuses or relays of the preheating system.
3. Remove all the glow plugs or injectors (nozzle) from the cylinder head, and store in the order in
which you removed them. This can be helpful for further diagnosis.
4. Clean the threads with e.g. compressed air.
5. Insert the appropriate adapter, tighten it and connect the adapter to the pressure gauge.
6. Now start the engine for about 4 seconds until the pressure on the tester no longer rises.
7. Note the maximum value and repeat the test on all remaining cylinders (step 5 to 7)

TEST RESULT

• For intact cylinders the pressure increases rapidly at the beginning of test up to a maximum value.
• Check all cylinders to manufacturer's instructions, the difference between them may be up to 10%.
• If one cylinder has no pressure, check the piston for damage and make a visual inspection of
injection nozzles. At high combustion temperatures, for example uncontrolled combustion can lead to
damage of the piston (formation of holes, cracks, etc.)
• If the value is less on two adjacent cylinders than the value of the other cylinders, there is a
defective cylinder head gasket in the transition zone between those two cylinders. This is also true if
there is water and / or oil on the glow plugs.
• If there is a lower reading on a cylinder as indicated by the manufacturer, drop a little engine oil into
the cylinder and run the compression test again. If pressure rises sharply, the piston rings are worn. If
the pressure remains the same low level, the defect is due to a leaky valve or a defective camshaft.
• If the pressure indicated on all cylinders is less than stated by the manufacturer, the motor has age-
related wear and for more diagnose the engine must be disassembled and measured.
• Install all the glow plugs or injectors (nozzle) in correct order and connect the fuses and relays
again.
NOTE: These instructions do not replaced the service literature. You may find additional information
in service-literature, e.g. required starting speed and other important information.
For all tests vehicle-specific data should be present, without this data can adequate results are not
ensured.
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