Mercury MerCruiser D2.8L D-Tronic Service Manual page 782

INTERCOOLER
8. Install engine cover.
Do NOT operate an engine without water flowing through seawater pickup pump,
as pump impeller may be damaged and subsequent overheating damage to engine,
transmission or sterndrive unit may result.
Watch temperature gauge on dash to ensure that engine does not overheat.
9. Upon first operating engine, after repair or service of intake system and/or intercooler,
observe temperature gauge for normal engine operating temperatures, and be certain
to check for leaks. Stop engine IMMEDIATELY in the event of leaking or overheating,
and repair as needed.
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CAUTION
CAUTION
SERVICE MANUAL NUMBER 22
90-860074--1 FEBRUARY 2002