Checking While Engine Is Cold; Changing; Engine Coolant; Checking - Mercury Inboard 5.7L Manual

3. Walter V‑Drive Transmissions ‑ Stop the engine and remove the dipstick to check the
level. If the fluid is below the top (full) line, add the specified fluid through the breather
elbow. Do not overfill. Reinstall the dipstick with the cap fully seated.

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

Allow the engine to cool down before removing the coolant pressure cap. A sudden loss
of pressure could cause hot coolant to boil and discharge violently. After the engine has
cooled, turn the cap 1/4 turn to allow any pressure to escape slowly, then push down and
turn the cap all the way off.
1. Remove the cap from the heat exchanger and observe the fluid level.
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.
90-860174050 JUNE 2005
a
a - Heat exchanger cap
WARNING
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Maintenance
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