QSB 6.7 Crank Case Pressure

[Joe F]

A recent pre-sale engine survey on a family member’s boat indicated:

BLOW BY TEST:<br />Crankcase blow by test was performed using a Cummins Insite program and<br />laptop computer. Port CCP was 5.7 InH20, which is above average and<br />starboard was 4.4 which is also above average.

The engines are 2014 (330 hrs) Qsb 6.7 480hp. Engines run good, no smoke, no oil leaks. Turbos intake side appear OK.

What should be considered normal  CCP? We will be replacing crankcase ventilation filters. Any other suggestions? 

Thank you.     

Joe

Topic

[Joe F]

Thanks Tony for the response- we won’t worry about the CCP. Aftercooler housings were no good in 2018 and replaced with new and greased. We added freshwater flush at that time. 

Just pulled the cores after five years and they came apart easily and look serviceable, pics attached. 

Joe

[Tony Athens]

IF the test was accurate ( I’d guess it was) the engines are perfect that way..

Worry more about the insides of your aftercoolers.  7 years in saltwater?,  and past “proper service history” per my protocols.

 

 

[Author]

Replies