Turbo Problems?

[38 HAT]

I took my first run yesterday after winter storage and when my port engine reached 1500 rpm's black smoke was pouring out the exhaust. The turbo was just replaced last July and has maybe 10hrs on it. I have a call into my mechanic but was wondering what your thoughts are. If the turbo is could the turbo have seized up over the winter layup? any other possible causes?

 

[workingonadream]

take the air sep off and see if you can spin the impeller. I had one get stuck on me a couple of years ago, once I broke it free, I was good. I always check them in the spring when I get launched before the shake down run. good luck

 

[38 HAT]

workingonadream it is seized, what did you use to free the turbo? I tried with my fingers and tapping on the shaft with a hammer and I couldn't free it.

 

[Genesis]

I would change it.

I know people who have successfully resurrected turbos in this condition.

But if it grenades on you (and given the RPM of an operating turbo, it well might) you won't like what may come with that as consequential damage as a result.

 

[dsharp]

Do you know where the replacement came from? I would also check the exhaust side and make sure it's not getting saltwater on the impeller. If you unhook the exhaust hose tie it up or plug it to prevent incoming water. You want to give a turbo a little time at idle before you shut the engine off so it is getting full oil flow. That's usually not a problem with boats since the time it takes to get the boat docked and tied up gives the turbo time to spin down. If you couldn't un-stick the impeller I would remove the exhaust hose and check that side.

 

[workingonadream]

I just did what you did I gave it a little tap and I was good. i figured it had something to do with the winter layup in a moist environment over a long period of time. if you are leaning hard on yours than I would say you have something more serious wrong, and I would pull it off and replace it

 

[34Hatt]

Thanks for the help, my mechanic is coming to look at it this week. I'm hoping it's carbon build up or something. I really don't want to spend another $2,500 to fix something I just replaced.

2,500 Have it rebuilt Scrod does Pumps, Injector and Turbos I had him do one of my turbos 2 years ago works flawless. The big question is WHY did this fail so soon? Derek may be able to help answer that question!

 

[Avenger]

In a marine application, after layup, my guess would be corrosion in the exhaust side. Either the exhaust housing or the heatshield behind the turbine could have scaled up and jammed it. Also as dsharp said, a faulty elbow could leak saltwater into the turbine side. That would ruin it in a hurry.

Was the whole turbo replaced or just the cartridge? And more importantly, WHY was it replaced?

It sound like it's going to have to come apart anyway, so please let us know what you find.

 

[Avenger]

The plot thickens!

If a faulty elbow caused the original failure and it wasn't diagnosed and replaced you didn't correct the root cause of said failure. Not good news for your new turbo if that's the case.

 

[Boatsb]

Do you Noah good mechanic?



Sorry I had to

 

[Genesis]

If it's an exhaust collector problem you will wind up having to have one fabricated. DeAngelo in Florida does 'em among others. Bring your checkbook -- you're going to need it.

 

[Avenger]

So if it's wind blowing smok... er,... salt up the pipe how come the other side doesn't have this chronic rusting problem?

I can't see it from here, but replacing a turbo due to a rotted housing, and then having the new one develop rot so soon doesn't exactly give me a warm fuzzy.

 

[Boatsb]

Scrod, he said he has only seen it on one engine when it has happened hence maybe north facing? The old one was not seized just the housing was rusted looked like outside in. I just got the boat last spring and there was a water leak coming from the fly bridge thru the inside window frame and onto the floor and maybe dripped onto turbo housing. I know I might be grasping at straws here put if it is the riser I might as well shoot my self. Has anyone had a riser issue and if so how did you solve the problem.

People make new risers. Some are even available off the shelf. Why such a panic about the riser?

 

[Avenger]

As I said, I can't see it from here, so we can only go by what you tell us. My point was both of your exhausts face the same way, no?

Risers can be replaced. If you're going to commit sewerpipe over a riser wait until you find out the rest of the costs of operating boats like these.

 

[workingonadream]

I remember in a previous post you recommended jim for the engine survey, if it is him doing the work, I would believe he is right about the open exhaust being the culprit as there does not seem to be any other logical reason since it was running fine when you put her to bed. I believe he has seen engines lock up during the winter layup in which the exhaust was left open. he has shown me heads in which the combustion chamber has looked liked its been hit 12 gauge buck shot he attributed that to the open exhaust too. always cover the exhaust. as for the risers, call deangelo in fla and get a set of stainless ones made, im sure jim would recommend stainless too you as well.good. pm me when you are ready to call them I have their number at home. take care

 

[workingonadream]

call deangelo 954-763-3005 they will be able to tell you, just tell them what engine and how many risers you need. I do know that they will want your current one(s) so they can mock up the new one(s) jim will take care of you, I have known him for a long time, he wont sell you something you don't need. let him check the risers before you spend the money, but you can still call to get an idea of what it will cost and how long the turn around if you do need to replace take care

 

[thoward]

Dry risers for 8v92 ran $6k to 10K. We used Alvern Marine out of Ft. Lauderdale and were very happy.

 

[Genesis]

DeAngelo made a set for Gigabite and did an excellent job. I loved their work -- they're proud of it, but quality costs money and in their case you get what you pay for.