Coolant Drain Plug (Engine) - Mitsubishi Heavy Industries L-Series Operation & Maintenance Manual

Cooling system - Clean
Clean the cooling system when operating the engine
first time, or restarting the engine after storage with
coolant drained.
1. Close coolant drain cocks and plugs.
2. Pour in a cleaning solution (a solution that is non-
corrosive to rubber and metals) in the cooling sys-
tem, and operate the engine at 800 to 900 min
about 15 minutes, then drain the cleaning solution.
3. Close coolant drain cocks and plugs.
4. Pour in fresh water, and operate the engine at 800
-1
to 900 min for about 10 minutes.
Repeat rinsing until the draining water becomes
clear and clean.
Chapter 8 PERIODIC INSPECTION AND MAINTENANCE PROCEDURES
Coolant drain plug
-1
for
Fig. 8-17 Coolant drain plug (engine)
8-11