Looking at a boat - Cummings QSB 6.7 480

• Aug 13, 2018

• #1

b_arrington

Well-Known Member

GOLD Sponsor

Feb 21, 2007

3,475

Setauket, NY

Boat Info

Back Cove 37
AB Ventus 9VL

Engines

Cummins QSC 8.3 600

I'm looking at a new (used) boat that has a Cummins QSB 6.7 480 mhp engine in it. I've only has gas engines, so diesels are a bit of a new experience for me. Can anyone offer any thoughts on these engines? Problem areas I should watch out for when checking out the boat? It's a 2014 model.

 

Last edited: Aug 14, 2018

• Aug 14, 2018

• #2

RollerCoastr

Well-Known Member

Nov 15, 2007

3,884

Cedar Point, OH / Miami, FL / MacRay Harbor, MI

Boat Info

1997 400DA
340HP 7.4 Mercruiser Bluewaters
Garmin 741, 742, 8212, 24HD, Intellian I2

Engines

1999 280BR
Twin 250HP Merc 350 Alpha Ones

B, your best resource will be sbmar.com Tony Athens is widely regarded as the go-to for all things Cummins. (note, no "g" in Cummins)

 

• Aug 14, 2018

• #3

b_arrington

Well-Known Member

GOLD Sponsor

Feb 21, 2007

3,475

Setauket, NY

Boat Info

Back Cove 37
AB Ventus 9VL

Engines

Cummins QSC 8.3 600

RollerCoastr said:

B, your best resource will be sbmar.com Tony Athens is widely regarded as the go-to for all things Cummins. (note, no "g" in Cummins)

Click to expand...

Thanks. Either I fat-fingered the spelling, or auto-correct got me. I know it's properly Cummins.

 

• Aug 15, 2018

• #4

S

swaterhouse

Well-Known Member

Jan 7, 2015

1,050

Mattapoisett, MA

Boat Info

2008 58 DB

Engines

MAN CRM 900

Seems like a lot of horsepower out of a 6.7 liter engine but Tony will not steer you wrong, I would reach out to them and/or post on their forum - they are all very helpful.

 

• Aug 15, 2018

• #5

b_arrington

Well-Known Member

GOLD Sponsor

Feb 21, 2007

3,475

Setauket, NY

Boat Info

Back Cove 37
AB Ventus 9VL

Engines

Cummins QSC 8.3 600

To my understanding, there are a couple versions of the 6.7 with various hp levels. The output depends on the tuning. There is another variant that outputs upward of 500 hp as well. The 6.7 took over the position of the QSB 5.9, with the same power outputs. I don't know a lot about diesels, but it seems like more displacement with same output should be less strain over the engine life.