ENGINE BREAK-IN PROCEDURE
General Auto RepairENGINE PRE-OILING
Pre-oil engine prior to operation to prevent engine damage.Lightly oiled oil pump will cavitate unless oil pump
cavities are filled with engine oil or petroleum jelly.
Engine pre-oiling can be done using pressure oiler (if available).
Connect pressure oiler to cylinder block oil passage such as
oil pressure sending unit. Operate pressure oiler long enough
to ensure correct amount of oil has filled crankcase. Check
oil level while pre-oiling.
If pressure oiler is not available, disconnect ignition system.
Remove oil pressure sending unit and replace with oil pressure
test gauge. Using starter motor, rotate engine starter until
gauge shows normal oil pressure for several seconds. DO NOT
crank engine for more than 30 seconds to avoid starter motor
damage. Ensure oil pressure has reached the most distant
point from the oil pump.
If new lifters or camshaft are installed, some
manufacturers require that a crankcase conditioner be added
to engine oil. The engine should be operated for specified
amount of time to aid in lifter break-in procedure.
INITIAL START-UP
Start engine and operate engine at low speed while checkingfor coolant, fuel and oil leaks. Stop engine. Recheck coolant and oil level.
Adjust if necessary.
CAMSHAFT
Break-in procedure is required when new or reground camshafthas been installed. Operate and maintain engine speed between
1500-2500 RPM for approximately 30 minutes. Procedure may
vary due to manufacturer's recommendations.
PISTON RINGS
Piston rings require a break-in procedure to ensure seating ofrings to cylinder walls. Serious damage may occur to rings if
correct procedures are not followed.
Extremely high piston ring temperatures are obtained during
break-in process. If rings are exposed to excessively high RPM
or high cylinder pressures, ring damage can occur. Follow piston
ring manufacturer's recommended break-in procedure.
FINAL ADJUSTMENTS
Check or adjust ignition timing and dwell (if applicable).Adjust valves (if necessary). Adjust idle speed and mixture.
Retighten cylinder heads (if required). If cylinder head or block is
aluminum, retighten bolts when engine is cold. Follow the engine
manufacturer's recommended break-in procedure and maintenance
schedule for new engines.
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General Automotive Repair
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