Please remember that in engine 133, the spark-plug holes must be blown out after removal of the ignition coils until dirt particles are no longer located in the spark-plug hole.
After removal of the spark plugs, the spark-plug holes must be thoroughly evacuated using an adapter, until dirt particles no longer appear on the sealing surface of the spark plug in the cylinder head.
To do so, the metal insert has to be removed from the hose of the adapter.
Document AP15.10P1580AHH contains a link to a WSM film, which illustrates the above-mentioned procedure.
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Adapter