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These are to be air tested at 30psi via Cummins

Great Video! My upper hose split. Can I just change to and see if it is just a bad hose?

How often should the aftercooler be cleaned

Good stuff - purchased boat w/cummins QSB 5.9's this fall and will remove and clean, test, etc in the spring. little nervous but looks fairly straight forward. Thanks for the video!

Are you sure its 315 horsepower. My specs say 205 horsepower. Also, how are you going to pay off Pink Floyd when they sue you into the dirt ?

Dude! Props on your instructional video. You gave perfect info, great images of what we needed to see, and used a camera on a stand or tripod. Those are three things that most other UA-cam videos lack. Most hold their phone with one hand and attempt to work with the other. Most give lousy narration. Most leave out the parts we really need to see. Please do more as I’m currently in the market for a used Bayliner 3788 and want to do my own survey and my own maintenance. I’ve worked on gas engines most of my life and believe I’ll pickup the required diesel knowledge that I need pretty quickly. Oh, and how the hell are you getting away with a Pink Floyd song and not snubbed by UA-cam?

GREAT!!! Now let’s see it on the PORT ENGINE. Next to impossible to get at and had to remove a motor mount to access the water pump.

Followed your plan and tested my aftercooler, marine gear cooler and heat exchanger, great job, worked perfectly. Thanks for the video.

How was it that you extended the fuel supply and fuel return lines?? Barbs and clamps??

Not just the cross section area, its the grade 8 which makes it bulletproof.

Did I hear you correctly, did you change the fuel banjo if so what did you use?

Well done.

Just wondering why you don’t test to 30 psi ... given your turbo should be pushing 25 -30 ?

Nice vid. Tks.

Nice video. I have a new-to-me regal 4160 with Cummins 6bta 370. Looking forward to seeing your oil change video!

Nice video, thanks for the shout out. I just did this in our shop yesterday on a 6BTA 370. Nice looking boat too. Enjoy it! We are here if you need anything.

What on God's green earth could have been blocking your cooler that bad. I think it was just a bad hose stretching more than the other and you had a bunch of impeller pieces on the bottom side of the aftercooler. Regardless I understand not needing them on a 330 horsepower application as long as you keep enough fuel in the tanks. However I think you should add them to your video during your recommendation of blowing air through the return that they pull their fuel fill cap off the tank so that if using an air compressor they don't split the tank open. In addition to that I don't know why unless somebody put a draw tube on your return as well you would ever hear bubbling through your return unless your tanks were slapped full technically you want all of the return fuel to fall on top of the fuel in the tank quickly dispersing the air bubbles created by agitation of circulating fuel. Rather than injecting all of those bubbles into the bottom of your tank presumably right next to the draw tube.