Mercury MerCruiser 5.7 Horizon, User Manual

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Section 5 - Maintenance
Page 68 90-899883173 DECEMBER 2007
Checking While Engine is Cold
NOTE: Cold fluid level check: To ease checking the fluid level, the dipstick can be marked
or scribed with a cold level mark.
1. Follow the procedure for the warm fluid level check, then allow the boat to sit overnight.
IMPORTANT: Be sure to push the dipstick all the way down into the dipstick tube when
checking the fluid level.
2. Remove the dipstick, wipe clean and reinsert.
3. Remove the dipstick, observe the fluid level and mark the cold fluid level.
4. Reinstall the dipstick, tighten the T‑handle securely. Do not overtighten.
Changing
Contact your authorized Mercury MerCruiser dealer.
Engine Coolant
Checking
!
CAUTION
A sudden loss of pressure can cause hot coolant to boil and discharge violently resulting
in serious injury from burns. Allow the engine to cool down before removing the coolant
pressure cap.
1. Remove the cap from the heat exchanger and observe the fluid level.
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Heat exchanger cap
2. The coolant level in the heat exchanger should be at the bottom of the filler neck. If the
coolant level is low, contact your authorized Mercury MerCruiser dealer.
3. Install the cap onto the heat exchanger.
IMPORTANT: When reinstalling the pressure cap, be sure to tighten it until it seats on the
filler neck.
4. With the engine at normal operating temperature, check the coolant level in the coolant
recovery bottle.