Engine Coolant-3.0 Mpi Ect; Checking - Mercury 3.0 MPI ECT Operation & Maintenance Manual

Engine Coolant—3.0 MPI ECT

Checking

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 thermostat housing and observe the fluid level.
2. The coolant level in the thermostat housing should be at the bottom of the filler neck. If the coolant level is low, contact
your authorized Mercury MerCruiser dealer.
3.
Check the antifreeze concentration for adequate freeze protection and correct if necessary. Refer to the Specifications
section.
4. Install the cap onto the thermostat housing.
IMPORTANT: Always tighten the pressure cap until it seats on the filler neck.
5. With the engine at normal operating temperature, check that the coolant level in the coolant recovery bottle is between the
"ADD" and "FULL" marks.
6. Add the specified fluid as necessary.
Tube Ref No.
Extended Life Antifreeze/Coolant
122
90-8M0113856 DECEMBER 2015
eng
Description
CAUTION
!
6102
Where Used
Closed Cooling System
Section 4 - Maintenance
32637
Part No.
92-877770K1
Page 55