500/520 DB official thread

[Michael Riglietti]

Figured I’d start one post up upgrades,repairs,questions.

Hello I am new to the site but have a question regarding my 2005 52 sedan bridge

1- Seem to have a alarm when cruising at 2000 rpm resets its self but comes back in a couple of minutes No alarm history in smart craft all gauges look right .. Boat runs good just wondering

 

[cod]

That hose barb appears to be on the bottom of the aftercooler and if it is dripping a lot of water then the core in the aftercooler is probably leaking. That will cause issues with the engine. The barb seems to be a later addition as mine doesn't have it (2006). I would think a drain hose should be attached. In the colder climates condensate can form on the cold aftercooler core and would be drained by this. So, if you are in salt water then taste what is dripping - if it's salty you need to get the aftercooler serviced.

Tom,

I wouldn’t think there would be a drain hole from the bottom of the aftercooler housing since there is high pressure airflow thru the aftercooler....No?

With that said, he is pointing to his heat exchanger in his diagram. It appears the photo shows that barb at the bottom of the Heat Exchanger. I have a drain plug in that location.

J98052.... FYI salt water also runs thru the heat exchanger which in turn cools the antifreeze. Basically, that’s your radiator like a car but instead of air cooled, it is water cooled. But.... if I’m looking at your pic correctly... that plug is at the area of the heat exchanger where antifreeze runs thru it so that’s confusing to me if you have water dripping from it.

 

[ttmott]

Tom,

I wouldn’t think there would be a drain hole from the bottom of the aftercooler housing since there is high pressure airflow thru the aftercooler....No?

With that said, he is pointing to his heat exchanger in his diagram. It appears the photo shows that barb at the bottom of the Heat Exchanger. I have a drain plug in that location.

J98052.... FYI salt water also runs thru the heat exchanger which in turn cools the antifreeze. Basically, that’s your radiator like a car but instead of air cooled, it is water cooled. But.... if I’m looking at your pic correctly... that plug is at the area of the heat exchanger where antifreeze runs thru it so that’s confusing to me if you have water dripping from it.

View attachment 88783

Understand but I believe that is the bottom of the Aftercooler or the bottom of the charge pipe from the turbo and top of the heat exchanger. Look closely at his picture and rotate it about 45 degrees clockwise and you are looking on top of the heat exchanger and the top of the oil cooler. The Exhaust insulation is on the left and the white thing in the background is the aftercooler support bracket. His camera shot is along side / under the turbocharger - right? Then look at a shot of mine below. Whatever that is, it looks to be dripping on top of the heat exchanger.

 

[spikedaddy99]

How do I get to the port side state room A/C? Salon is under the port sofa, master is under the bed.

 

[Mac Magic]

Behind the galley sofa. Port side.

 

[Mac Magic]

Has anyone had an issue with their horn pump? Mine not working. Wondering if there is a fix versus replacement.

 

[Mac Magic]

Has anyone had an issue with their horn pump? Mine not working. Wondering if there is a fix versus replacement.

 

[spikedaddy99]

Has anyone had an issue with their horn pump? Mine not working. Wondering if there is a fix versus replacement.

Is the breaker on? 1st year I had this boat the yard turned it off in the winter lay up so the pump would quit cycling. I didn't know it was on a breaker, but found out the hard way (like I learn everything)

 

[bmac]

Check to make sure your the compressor breaker is on. It's on the DC panel in the engine room.

 

[carterchapman]

Check to make sure your the compressor breaker is on. It's on the DC panel in the engine room.

Hey Brian,

How do you trip those guarded breakers? I was going to turn mine off the other day - looks like you have to use a small pin inserted into the slot.

 

[Jeremygavin]

Hey Brian,

How do you trip those guarded breakers? I was going to turn mine off the other day - looks like you have to use a small pin inserted into the slot.

I use a small flat head screwdriver.

 

[Mac Magic]

Yes. Breaker is on. I turn the breaker on and off and turn the pump on and off and the breaker trips....so something wrong with pump. Would rather repair if possible versus spend $500 to replace

 

[cod]

Understand but I believe that is the bottom of the Aftercooler or the bottom of the charge pipe from the turbo and top of the heat exchanger. Look closely at his picture and rotate it about 45 degrees clockwise and you are looking on top of the heat exchanger and the top of the oil cooler. The Exhaust insulation is on the left and the white thing in the background is the aftercooler support bracket. His camera shot is along side / under the turbocharger - right? Then look at a shot of mine below. Whatever that is, it looks to be dripping on top of the heat exchanger.
View attachment 88793

Ahh.... Yes I believe you are right. So I guess if the aftercooler is getting water in it, it’s possible for it to leak at that barb?

I would think another possible leak then could be the aftercooler housing top and bottom end cap o-rings (part#9 in the diagram) where the stainless steel pipes are connected at the front end of the aftercooler?
Might pay to try replacing those prior to and expensive
Aftercooler.

 

[j98052]

I talked to my mechanic - he had a couple of thoughts:
1. Older versions of the QSM 11 had a plug in that spot; at some point Cummins installed a drain at the bottom of the aftercooler.
2. It could be condensation - when cold seawater (about 56 degrees in Seattle) runs through a hot engine, condensation forms on the coils of the aftercooler, and drains out through the drain.
3. It could be a leak in the after cooler, although he felt that at 800 hours, it's unlikely to be a leak.

One simple solution: taste the water. If it's salty, it's likely a leak; if not, it's likely condensation.

His advice: keep an eye on it. If water is dripping out while running the boat, it's likely a leak (pending taste test).

He also said that it's very easy to pull the aftercoolers off of these engines, and have them pressure tested.

Understand but I believe that is the bottom of the Aftercooler or the bottom of the charge pipe from the turbo and top of the heat exchanger. Look closely at his picture and rotate it about 45 degrees clockwise and you are looking on top of the heat exchanger and the top of the oil cooler. The Exhaust insulation is on the left and the white thing in the background is the aftercooler support bracket. His camera shot is along side / under the turbocharger - right? Then look at a shot of mine below. Whatever that is, it looks to be dripping on top of the heat exchanger.
View attachment 88793

 

[ttmott]

Ahh.... Yes I believe you are right. So I guess if the aftercooler is getting water in it, it’s possible for it to leak at that barb?

I would think another possible leak then could be the aftercooler housing top and bottom end cap o-rings (part#9 in the diagram) where the stainless steel pipes are connected at the front end of the aftercooler?
Might pay to try replacing those prior to and expensive
Aftercooler.

View attachment 88826

You might see some condensate form on the aftercooler core in the colder water areas and reside in the bottom of the housing then the hot air from the turbo dries it out. But in this case it looks like a lot of water coming out of that nipple. More times than not it's a core leak. If inhaled by the engine it can cause issues such as the OP is seeing. My engines do not have that fitting on the underside of the aftercooler assembly so it's all new to me....

 

[ttmott]

I talked to my mechanic - he had a couple of thoughts:
1. Older versions of the QSM 11 had a plug in that spot; at some point Cummins installed a drain at the bottom of the aftercooler.
2. It could be condensation - when cold seawater (about 56 degrees in Seattle) runs through a hot engine, condensation forms on the coils of the aftercooler, and drains out through the drain.
3. It could be a leak in the after cooler, although he felt that at 800 hours, it's unlikely to be a leak.

One simple solution: taste the water. If it's salty, it's likely a leak; if not, it's likely condensation.

His advice: keep an eye on it. If water is dripping out while running the boat, it's likely a leak (pending taste test).

He also said that it's very easy to pull the aftercoolers off of these engines, and have them pressure tested.

Anyway you look at it a hose should be put on that nipple so it can drain / drip elsewhere. What about your other engine? Same thing?

 

[j98052]

Anyway you look at it a hose should be put on that nipple so it can drain / drip elsewhere. What about your other engine? Same thing?

It's nearly impossible to check that area of the starboard engine while the engine is hot.

 

[bmac]

I use a small flat head screwdriver.

That is exactly how I do it.

 

[rlynch03]

Small improvement today. Removable P Handles. Will make it easier to get out of the water.

 

[Mac Magic]

Anybody replace the bridge vents?