OM-C3 11/21
13
Engine Operation
NORMAL ENGINE OPERATION
Observe engine coolant temperature and engine oil
pressure. Temperatures and pressures will vary between
engines and with changing operating conditions ,
temperatures, and loads. See GENERAL ENGINE
SPECIFICATIONS on pages 74-75 of this manual for
temperature and pressure specifications for your engine.
If coolant temperature rises above the maximum coolant
temperature (see Specifications Section) reduce load on
engine. Unless temperature drops quickly, stop engine and
determine cause before resuming operation.
Operate the engine under a lighter load and at slower than
normal speed for first 15 minutes after start-up. DO NOT
run engine at slow idle unless necessary for maneuvering
out of dock and harbor.
Stop engine immediately if there are any signs of part
failure. Symptoms that may be early signs of engine
problems are:
• Sudden drop in oil pressure
• Abnormal coolant temperatures
• High marine gear oil temperature
• Unusual noise or vibration
• Sudden loss of power
• Excessive black exhaust
• Excessive fuel consumption
• Excessive oil consumption
• Fluid leaks Break-In Service
