Crate HEMI® Engine Kit Instruction Sheet www.mopar.com
Rev Level 5.0 – K6862625 27
Warm Up
Once started the engine will be cold and will idle at a high RPM. Do not depress the accelerator during
warm-up stage. The RPM should decrease gradually as temperature increases. The idle RPM will level
out and the engine should be running at approximately 200–230°F (93–110°C). Once the engine has
reached operating temperature, follow Break-In procedure below.
Break-In
The following tips will be helpful in obtaining optimum performance and maximum durability for your
new crate engine.
Despite modern technology and World Class manufacturing methods, the moving parts of the engine
must still wear in with each other. This wearing in occurs mainly during the first 500 miles (805 km) and
continues through the first oil change interval. It is recommended for the operator to observe the
following driving behaviors during the new engine break-in period:
0 to 100 miles (0 to 161 km):
Do not allow the engine to operate at idle for an extended period of time.
Depress the accelerator pedal slowly and not more than halfway to avoid rapid acceleration.
Drive with the engine speed less than 3,500 RPM.
100 to 300 miles (161 to 483 km):
Depress the accelerator pedal slowly and not more than halfway to avoid rapid acceleration in
lower gears (1st to 3rd gears).
Drive with the engine speed less than 5,000 RPM.
300 to 500 miles (483 to 805 km):
Exercise the full engine rpm range, shifting manually (paddles or gear shift) at higher rpms when
possible.
Do not perform sustained operation with the accelerator pedal at wide open throttle.
500 to 1000 miles (805 to 1610 km):
Exercise the full engine rpm range, shifting manually at higher rpms when possible.
Do not perform sustained operation with the accelerator pedal at wide open throttle.
For the first 1500 miles (2414 km):
Do not participate in track events, sport driving schools, or similar activities during the first 1500
mi (2414 km).
NOTE: Check engine oil with every refueling and add if necessary. Oil and fuel consumption may be
higher through the first oil change interval. Running the engine with an oil level below the add mark can
cause severe engine damage.
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