Cummins 4BT – Engine Run-In Procedure “ In Chassis” – (On- and Off-Highway Vehicles)

On-High way
Caution: Refer to General Engine Test Procedures – (Chassis Dynamometer) (8-05) before operating the en­gine to avoid internal component damage.
Operate the engine at 1,500 to 1,800 RPM in high gear for the first 80 to 160 kilometers [50 to 100 miles] after rebuild.

NOTE: Do not idle the engine for more than 5 minutes at anyone time during the first 160 kilometers [100 miles] of
operation.

Off-Highway
Caution: Refer to General Engine Test Procedures – (Chassis Dynamometer) (8-05) before operating the en­gine to avoid internal component damage.
Operate the engine as follows during the first 3 hours after rebuild:

1. Do not idle the engine for more than 5 minutes at any one time.
2. Operate the engine at 75 percent throttle while loaded.

3. Do not operate the engine at rated speed (RPM) and fuli load for more than 5 minutes at any one time.