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AC 0200
DIESEL COMPRESSION GAUGE
DIESEL ENGINES
- Set up the suitable injector-holder or heater-plug instead of the dismounted ones and connect
the tight quick connection from the compression tester to the false injector or heater plug.
TEST PROCEDURE
Looking through the feed of the needle during the test, it is possible to draw the following results
about the engine conditions:
• Quick-feed of the needle during the first revolutions of the engine and slow-feed until maximum
speed during the following revolutions,means piston rings and valve in good conditions.
• Slow-feed of the needle from the first revolutions of the engine, means valve seats probably
burnt out.
• Quick-feed during the first revolutions of the engine and following slow-feed: general wear
conditions and poor seal of the movers.
TEST RESULTS
At the end of the test, remove the card from the card-holder, and look carefully at the diagram:
• The test values accord with the specifications of the engine manufacturer and are equal each
other: the tightness of the piston rings and valves is good.
• The test values are low but equal for all cylinders: general wear of the engine.
• The test values are very discordant: variable wear in the cylinders with lower value. Lacking wear
in some valves.
• Introducing engine oil through the spark-plug hole or the injector hole, the probable piston ring
losses are partly eliminated, therefore, repeating the test, if higher pressure values are reached,
this means that the defect is due to the loss of elasticity of bands or cylinder deformity.
If the results are same as before, check the valves.
• If the values are lower in 2 adjacent cylinders: the head gasket relating to these 2 cylinders is
probably damaged.
N.B. - Use only writing card on our compression tester 8-40 calibration for Diesel engine models.
ACCESSORIES
• Set of 5 replacement rubbers.
• Set of 48 spare cards 8-40.
• Adapter forM12 spark plug.
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