Volvo Penta V8-300CE DP w/cl cool

[herbk]

A day on the water resulted in a tow back to the lift.
Boat is a Cobalt (2020) R-5 with Volvo Engine.
About 50 hours.
265 F temperature before we could shutdown for the
tow. Closed cooling, pump looks near disintegration.

Is the engine OK after the pump replacement?
I guess we will see......

 

[Nashville]

A day on the water resulted in a tow back to the lift.
Boat is a Cobalt (2020) R-5 with Volvo Engine.
About 50 hours.
265 F temperature before we could shutdown for the
tow. Closed cooling, pump looks near disintegration.

Is the engine OK after the pump replacement?
I guess we will see......

The closed side stayed wet and didn’t run dry. Engine, all aluminum, should be okay since temperature was even throughout; antifreeze stayed circulating and no steam hammering. The manifolds along with risers (both aluminum) and fuel pump are cooled by the failed raw/sea water pump and were starved and dry. Manifolds and risers, including all related joints/gaskets along with “manifold thermostats”, should be disassembled and checked. Cats run dry and are okay. Raw/sea water meets exhaust gases at the riser, so all rubber bits that follow could be toasty. The fuel pump, both cartridges, should be checked for impact and heat damage. Serpentine and raw/sea water belts should be checked for impact damage. Wiring adjacent to manifolds and risers should be checked for melting/burn damage. Finally, an oil and filter change. Certainly an engine temperature alarm. An exhaust temperature alarm also?

 

[herbk]

Thanks Seaman:
Sounds like a possible grim outlook.
If the shoe was reversed, how much of your laundry list would you expect and push warranty to cover?

 

[Nashville]

Thanks Seaman:
Sounds like a possible grim outlook.
If the shoe was reversed, how much of your laundry list would you expect and push warranty to cover?

The ECM recorded any alarm(s), how they were handled and elapsed time to shutdown. I doubt grim, but whether grim or a few minor things here/there and whether and an easy or difficult warranty claim likely depends on whether shutdown occurred within seconds or it was run for minutes after the initial alarm. At least one alarm should have sounded, but no less than two sensors should have triggered with five being likely (ECT and exhaust temperature for both banks, pre and post). Did it alarm? How long till shutdown? FWIW, most of the list is due to the fact it’s a boat. While autos should be handled thoroughly, boats are more like aircraft since you can’t just pull over and exit.

Edit. P.S. The pump is definitely warranty.

 

[herbk]

The ECM recorded any alarm(s), how they were handled and elapsed time to shutdown. I doubt grim, but whether grim or a few minor things here/there and whether and an easy or difficult warranty claim likely depends on whether shutdown occurred within seconds or it was run for minutes after the initial alarm. At least one alarm should have sounded, but no less than two sensors should have triggered with five being likely (ECT and exhaust temperature for both banks, pre and post). Did it alarm? How long till shutdown? FWIW, most of the list is due to the fact it’s a boat. While autos should be handled thoroughly, boats are more like aircraft since you can’t just pull over and exit.

Edit. P.S. The pump is definitely warranty.

Nashville
I will let you know.
No "audible" alarms during the event. A slow down and alarm when glass cockpit reported the overheat event visually.

My spring commissioning report had some comments:

"4/13 launch and sea trial. exhaust temp hi alarm went off leaving the creek. went back to dock. removed impeller , looked okay but
replaced anyway,. needs a new pump and or bushing that holds the pump from rotating. sent pics to js and evan. checked for active
campaigns and found two for this serial number"

Thanks for all thoughts.
herbk

 

[Nashville]

Nashville
I will let you know.
No "audible" alarms during the event. A slow down and alarm when glass cockpit reported the overheat event visually.

My spring commissioning report had some comments:

"4/13 launch and sea trial. exhaust temp hi alarm went off leaving the creek. went back to dock. removed impeller , looked okay but
replaced anyway,. needs a new pump and or bushing that holds the pump from rotating. sent pics to js and evan. checked for active
campaigns and found two for this serial number"

Thanks for all thoughts.
herbk

Interesting. The anti-rotation bracket broke (it’s the black rod in the second pic). If a bad bushing or bracket, what occurred is a likely outcome. The question becomes what broke first… bushing/bracket or casting. The documentation is helpful and relevant. If not replaced in April, is today a coincidence or is what was observed then what set this chain of events in motion? Something else on your side, the bearing and seal were intact. How do we know? There is a weep hole at the 6-o’clock position on this pump. When they begin to fail, a perpendicular grease splatter line develops on the bilge. Light line, new issue. Dark line, not noticed, not understood or ignored. Best wishes.