Checking compression
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01—010 Checking compression
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Test values in bar for engine at operating temperature
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Engine
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Compression Compression ratio normal
t : 1
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Min. Compression Max. difference
between separate cylinders
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Normal compression
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9.0
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10-12
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approx. 8,5
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Low compression
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max. 1,5
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(T) (T) starting 1976 (aus) starting 1977
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8.0
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9-10
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approx. 7,5
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Special tool
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Compression recorder with attachments and contact grip.
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001 589 46 21 00
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Notes
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Check compression with coolant at temperature of 80° C.
Check cylinders for leaks if compression is less than the minimum specification (01—015).
Unscrew all spark plugs for testing.
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01.2-010/1 F3
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Checking
Models 107, 114 and 116
Connect contact handle to battery + and terminal 50 on starter.
Disconnect cable on ignition coil terminal 1.
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105-9061
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Model 123
Connect contact handle to terminal 30 and to terminal 50 on cable connector.
Disconnect cable on ignition coil terminal 1.
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 100-11048
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Attention!
On engines with CIS injection system, pull-off relay with code number 21 (3) for fuel pump—warm-up compensator.
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“I54-112O5
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Model 126
Separate cable plug, arrow terminal 16, so that the ignition coil, and on engines with CIS the fuel pump, cannot be activated. Connect terminal 30 and 50.
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| 01.2-010/2 F3 |
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1 Rotate engine for several turns with ignition switched off and idle speed or selector lever position ,,P” so that residue and soot will be blown out.
2 For testing, rotate engine for eight turns while opening throttle valve.
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01.2-010/3 F3
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