Compression Test Data - Perkins New 1000 Series Workshop Manual

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New 1000 Series

Compression test data

Tests have shown that many factors affect compression pressures. Battery and starter motor condition,
ambient conditions and the type of gauge used can give a wide variation of results for a given engine.
It is not possible to give accurate data for compression pressure, but tests have shown that the results should
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be within 2000/3500 kPa (300/500 lbf/in ) 21,0/35,0 kgf/cm for diesel engines.
Compression tests should only be used to compare between the cylinders of an engine. If one or more
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cylinders vary by more than 350 kPa (50 lbf/in ) 3,5 kgf/cm , then those cylinders may be faulty.
Compression tests should not be the only method used to show the condition of an engine, but they should be
used together with other symptoms and tests.
How to do a compression test
Caution: Before the compression test, ensure that the battery is in good condition and that it is fully charged.
Also ensure that the starter motor is in good condition.
1 Ensure that the valve tip clearances are set correctly, see Operation 3-6 for four cylinder engines or
Operation 3-7 for six cylinder engines.
2 Remove the atomisers.
3 Fit a suitable gauge into the atomiser hole of the cylinder to be tested.
Caution: Ensure that the engine cannot start:
4 Disconnect the stop solenoid or put the stop control in the no-fuel position.
5 Operate the starter motor and note the pressure indicated on the gauge.
6 Repeat for each cylinder.
40 Workshop Manual, TPD 1350E, Issue 4
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