Beta 960CMB Instrucciones De Uso página 5

ting needle will fall back to its initial position; the quick connection can be removed from
the spark-plug hole after having exercised a light pressure on the engine.
- Advance the card of a step, pressing the designated push-button.
- Test the compression of the second cylinder as previously explained, and so on
to the last cylinder.
Test analysis
Observing the needle movements 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
to the maximum in the following revolutions = piston rings and valves are in good condi-
tion.
- Slow-feed of the needle from the first revolutions of the engine = the valve seats
are probably burnt.
- Quick-feed during the first revolutions of the engine and slight feed to follow =
general wear conditions and poor seal of the movers.
Result analysis
At the end of the test, remove the card from the card-holder, and look carefully at the
diagram:
- The test values correspond with the specifications of the engine manufacturer
and match= the tightness of the piston rings and valves is good.
- The test values are low but the same for all cylinders: general wear of the engi-
ne.
- The test values are very discordant = unusual wear in the cylinders with the
lower values. Insufficient wear of some valves.
- The lowest values are in 2 adjacent cylinders = the head gasket relating to
these 2 cylinders is probably damaged.
Introducing engine oil through the spark-plug hole or the injector hole, the probable pi-
ston ring losses are partly eliminated, therefore, repeating the test, if higher pressure
values are reached, this means that the detect is due to the loss of elasticity of bands or
cylinder deformity.
lf the results are some as before, check the valves.
N.B.
- Only use writing cards on our compression tester having checked the correct
4-17 calibration for petrol engine models, and 8-40 calibration for Diesel engine models.
Accessories
- Set of 5 replacement rubbers.
- Set of 48 spare cards 4-17.
- Set of 48 spare cards 8-40.
- Adapter for M 12 spark plugs.
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