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Crowley Marine: serving boaters for over 40 years Crowley Marine: serving boaters for over 40 years
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Remanufactured Powerhead Break-In Procedure

Crowley Marine

The first 10 hours of operation

  • Double your oil with a major manufacturer TCW-3 Oil.
  • Use 92-94 Octane Fuel from a major manufacturer.
  • Do not use fuel with alcohol as an additive.

Initial Break-In & Warm Up

  • Allow 4 hours at idle speed only for break-in of new pistons or rings.
  • Avoid continuous full throttle operation for the first 10 hours of operation.
  • Liquid cooled engines require that the engine be brought gradually to normal operating temperature to avoid cold seizure resulting from pistons expanding faster than the cylinder liner.
  • DO NOT RUN ENGINE AT CONSTANT RPM FOR PROLONGED PERIODS OF TIME.
  • After gradually bringing engine to normal operating temp., operate engine in gear at approx. 1500 RPM for 20 minutes.
  • Operate in gear at no more than 3000 RPM for the next 60 minutes.
  • Cruise at 3/4 throttle or less for the next 4 hours.
  • Occasionally reduce throttle to idle speed for a cooling period.
  • During the final hours of break-in you can operate at full throttle for periods of 2 minutes or less.

Note:

  • Use only enough throttle to plane your vessel and then throttle back to below 3000 RPM.
  • Avoid operating in the 3000-4000 RPM range at all times during the 10 hour break-in period.
  • During the 6th hour of break-in, plane boat quickly and then throttle back to maintain minimum plane speed.
  • During this 6th hour, you can throttle up to 3/4 throttle for 1-2 minutes, then return to minimum planing speed.

Carefully following these instructions will aid in the proper break-in of your rebuilt powerhead assembly.

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