ABB HT576019 Operation Manual page 123

CAUTION
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Taking out of operation at short notice
Fit cover plate
Close opening in gas outlet casing using cover plate.

Fasten cover plate using spacer sleeves and nuts (61037).

Shut off the supply of lubricating oil to the turbocharger.
Operation Manual / TPL67-C.. - TPL71-C..
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9.3 Page 121