Official Cummins 6cta 450C thread

[Forrestkk]

Actually, I was incorrect on where that hose connected to.
It goes from the side of oil pan to the bottom of the air filter can, I'm assuming collecting oil and returning to pan.
I looked up the parts on Cummins website and it shows that hose and fittings, but it labels all of it as one part and the picture of part number does not match and it's very pricey for all of it. I'll try to contact cummins directly and see if they can further break down the parts and confirm all.
Thanks

Yup, comes from the Walkers units and let's the oil go back down. I switched to SBMAR Envirovents and plugged. I still have the fittings and wouldn't hate to get rid of them. Interested to know how it is secured inside the oil pan.

 

[boaterholic]

Yup, comes from the Walkers units and let's the oil go back down. I switched to SBMAR Envirovents and plugged. I still have the fittings and would hate to get rid of them. Interested to know how it is secured inside the oil pan.

I’m assuming it’s just screwed in like an oil pan plug. I can see it has the sealing flat washer under the fitting. The parts diagram on Cummins diagram does not show any parts inside the pan.

 

[Blueone]

I’m assuming it’s just screwed in like an oil pan plug. I can see it has the sealing flat washer under the fitting. The parts diagram on Cummins diagram does not show any parts inside the pan.

I know of no parts inside an oil pan in our diesel engine size

 

[Forrestkk]

Hi All,

As some of you know, the 45OEB doesn't have access to the top of the engines without pulling the whole cockpit floor making everything is harder.

So, after a long (travelling for work too much) and painful maintenance cycle (after cooler, heat exchanger maintenance, water pump rebuilds, etc.) I am two parts away from getting back on the water.

Interested in thoughts on my start-up.

Had some silicate (dirt) in the oil when I pulled the oil samples this year. Blackstone said check intake tracks or asked if I had done maintenance. I did, valve adjustments on both. Of course, have had the engine open at the water pump mounts for awhile now.

To avoid getting another dirty sample when I pull again at 85 hours, plan to crank up on the old oil and let that circulate, then change it for the season.

Also, not doing my annual fuel filter change until after the original crank and shake down. Have additives, including biocide in the tanks, but want to circulate the fuel and "scrub" anything out with the old filters and then change.

Also, planning on running at the dock then letting it cool down to tighten clamps and bolts before heading out for a shake down.

Thoughts? Tips?

TIA!

Kevin

 

[Irie308]

Hi All,

As some of you know, the 45OEB doesn't have access to the top of the engines without pulling the whole cockpit floor everything is harder.
So, after a long (travelling for work too much) and painful maintenance cycle (after cooler, heat exchanger maintenance, water pump rebuilds, etc.) I am two parts away from getting back on the water.

Interested in thoughts on my start-up.

Had some silicate (dirt) in the oil when I pulled the oilbsamples this year. Blackstone said check intake tracks or asked if I had done maintenance. I did, valve adjustments on both. Of course, have had the engine open at the water pump mounts for awhile now.

To avoid getting another dirty sample when I pull again at 85 hours, plan to crank up on the old oil and let that circulate, then change it for the season.

Also, not doing my annual fuel filter change until after the original crank and shake down. Have additives, including biocide in the tanks, but want to circulate the fuel and "scrub" anything out with the old filters and then change.

Also, planning on running at the dock then letting it cool down to tighten clamps and bolts before heading out for a shake down.

Thoughts? Tips?

TIA!

Kevin

I believe i had similar readings a few years back when i added my boost sensors. Believe it or not it was due to the thread sealer i used on my fittings at the intake manifold.

 

[boaterholic]

Yup, comes from the Walkers units and let's the oil go back down. I switched to SBMAR Envirovents and plugged. I still have the fittings and wouldn't hate to get rid of them. Interested to know how it is secured inside the oil pan.

If fittings in good shape and you want to get rid of them send me a pm, thanks

 

[Irie308]

Does anyone have info on how long we can run this motor at wide open? Shake down cruise this weekend got me wondering as I did my start of season wide open to make sure i hit my numbers. Ran wide open for about 3/4 of a mile . Aside from the fuel burn it seemed quite happy at WOT.

 

[boaterholic]

Does anyone have info on how long we can run this motor at wide open? Shake down cruise this weekend got me wondering as I did my start of season wide open to make sure i hit my numbers. Ran wide open for about 3/4 of a mile . Aside from the fuel burn it seemed quite happy at WOT.

I don’t have a Cummins direct answer, but I can tell you my engine surveyor was a retired Cummins mechanic and during survey he told the boat captain to run WOT for 5 minutes continuos so he could check temps/pressures/etc.

 

[Blueone]

I don’t have a Cummins direct answer, but I can tell you my engine surveyor was a retired Cummins mechanic and during survey he told the boat captain to run WOT for 5 minutes continuos so he could check temps/pressures/etc.

My Cummins guy opened the hatch and went down there to look over the engines when running wide open ......the sound was deafening. It wasnt 5 minutes though....thats a long time

 

[ttmott]

Does anyone have info on how long we can run this motor at wide open? Shake down cruise this weekend got me wondering as I did my start of season wide open to make sure i hit my numbers. Ran wide open for about 3/4 of a mile . Aside from the fuel burn it seemed quite happy at WOT.

https://www.cummins.com/engines/marine-ratings

 

[Forrestkk]

My Cummins guy opened the hatch and went down there to look over the engines when running wide open ......the sound was deafening. It wasnt 5 minutes though....thats a long time

It depends on your props, RPMs, and EGT. Get that EGT too hot and all sorts if stuff will melt. The 480CEs are notorious for getting the exhaust valve too hot and the valve sticks and then it pops the valve keepers.

No real data, but I give about 30 secs if WOT per trip right at the end and slowly pull back to 2100 RPM (you shouldn't snap cool).

I flew for the USAF, and every turbine engine had max continuous, 10 min, 2 min, and 30 sec ratings before you started melting things. WOT for me is 30 secs or less. Rarely will I push above 2100 unless I am trying not to be in someone's way.

Just my $0.02

 

[Forrestkk]

https://www.cummins.com/engines/marine-ratings

That is good info.

 

[Woody]

Does anyone have info on how long we can run this motor at wide open? Shake down cruise this weekend got me wondering as I did my start of season wide open to make sure i hit my numbers. Ran wide open for about 3/4 of a mile . Aside from the fuel burn it seemed quite happy at WOT.

This is from the performance curve for my engines

Intermittent Rating: This power rating is intended for Intermittent use in variable load application where full power is limited to two (2) hours out of every eight (8) hours of operation. Also, reduced power operation must be at or below 200 RPM of the maximum rated RPM. This rating is an ISO 3046 fuel stop power rating and is for applications that operate less than 1500 hours per year

 

[Irie308]

This is from the performance curve for my engines
View attachment 144467

Intermittent Rating: This power rating is intended for Intermittent use in variable load application where full power is limited to two (2) hours out of every eight (8) hours of operation. Also, reduced power operation must be at or below 200 RPM of the maximum rated RPM. This rating is an ISO 3046 fuel stop power rating and is for applications that operate less than 1500 hours per year

Good info but that's what I'm not clear on. Not that I would, but from what I've read and you have posted here, I can run at full power for up to 2 hours? Also if my WOT is 2650, I can run at 2450 all day?

 

[ttmott]

Good info but that's what I'm not clear on. Not that I would, but from what I've read and you have posted here, I can run at full power for up to 2 hours? Also if my WOT is 2650, I can run at 2450 all day?

There are the specs on the engines but there is also where the boat runs the best. The hull, it's condition, propellers, vessel weight, fuel burn, speed, and ten other factors actually determine where the boat/engine play the best together. For example I can run my engines at 2100 RPM all day long at 29 MPH but the boat is just not comfortable there; my fuel burn is way over the mileage gained. Now if I run the boat at 1850 the fuel burn reduces almost 20 percent but speed only drops from 29 to 22 MPH. Things quiet down significantly and load goes from 85 percent to 75 percent. I guess what I'm saying is there is much more to finding where to operate the engines than what the Cummins parameters are.

 

[LMBoat]

Agree with all the points above. My '99 6CTA's seem to just like 2200 RPM. i get 20 knots, fuel burn is good. I don't have the fancy electronics that show fuel burn, load, etc., but things just "feel" right. I do push it to the stops for a minute or 2 once/twice a year just to check max ratings. i've run it like that for 11 years and 1,400 hours and no issues <knock on wood>.

 

[Forrestkk]

For a data point, I typically run 2100rpm at 16 to 17 knots depending on wind/current/weight. I did have 2.5" (26" to 23.5") of pitch taken out last year to hit my 2600. My cruise speed dropped a bit, but got a higher top speed as I gained 200 RPM from the 2400 I was able to attain prior.

 

[saopm]

Good info but that's what I'm not clear on. Not that I would, but from what I've read and you have posted here, I can run at full power for up to 2 hours? Also if my WOT is 2650, I can run at 2450 all day?

I think the “Variable Load Applications” is what you want to key in on. If you go WOT for 2 hrs it would be a “Constant Load Application”.

 

[Irie308]

Agreed. I think i know the sweet spot for our vessel when fully and moderately loaded. We spend maybe 1/2 of our cruising at 1200-1300 rpm as we trawl. Once we get out in the ocean and it gets too uncomfortable to go slow we bump it up to 2300. I generally only hit WOT during the first run when launched and when we head to our winter home to haul. I'm always quick to pull the throttles back but it got me wondering how long I could sustain WOT without harming the motors. Say we had an emergency on the water, never being too far from a harbor, could I run WOT for 20 mins to get someone medical help? Just trying to get a better understanding of the ratings.

 

[Woody]

Good info but that's what I'm not clear on. Not that I would, but from what I've read and you have posted here, I can run at full power for up to 2 hours? Also if my WOT is 2650, I can run at 2450 all day?

Your rated RPM is 2,600 not 2,650. I only have the water temp, oil pressure, and rpm to monitor my engines. When I first got the boat I ran it home at 2,400rpm all day. I didn't run WOT at all. It being my first diesel boat I really had nothing to compare to, it ran fine, sounded OK to me.

I experimented with rpm after that. Depending on which props are on I found I liked 2,150-2,200rpm, just seems to feel like the best rpm when cruising.