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Old 06-05-2016, 02:31 PM   #41
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So I found the blow by today. On this boat, the blow by Vince to the outside via a 10 foot long 1 inch hose. So, the oil is deafly not coming from the blow by. A mechanic friend of mine looked at it and said clearly the oil is coming from a leaking oil seal on the turbos.

His take was that as long as there is oil the bearings are in no danger and will probably get some more use out of the turbos. I am still thinking about changing them,however, or I should say getting them rebuilt while I have the exhaust system apart.

Gordon
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Old 06-05-2016, 05:32 PM   #42
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If blowby vents outside the boat, and if by chance there is a low spot in the hose, oil will a accumulate there and form a liquid trap. That will pressurize the crankcase and force oil out the turbo shaft seals.
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Old 06-05-2016, 10:45 PM   #43
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If blowby vents outside the boat, and if by chance there is a low spot in the hose, oil will a accumulate there and form a liquid trap. That will pressurize the crankcase and force oil out the turbo shaft seals.
Well dammit....I learn something new everyday!!!
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Old 06-07-2016, 05:21 PM   #44
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vent tube

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Yep, if blowby is vented into turbo as most are, some oil can ooze around compressor scroll and is a non-issue.

On a B-motor, the envirovent system is a big improvement over the factory blowby vent.
Ski,

So to follow your thinking on the Boat Diesel forum, you think the engine is not venting from the vent tube and gases, laden with oil, are making their way back to the turbos? How are the gasses getting there, to the turbo, that is? Your thinking is that using the envirovent system will solve the problem? Tony seemed to pooh-pooh my answer that gases might be entering from the oil return tube.

I would love to get Tony's take, but am thinking my pictures are not quite up to his standard.

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Old 06-08-2016, 07:34 AM   #45
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So I found the blow by today. On this boat, the blow by Vince to the outside via a 10 foot long 1 inch hose. So, the oil is deafly not coming from the blow by. A mechanic friend of mine looked at it and said clearly the oil is coming from a leaking oil seal on the turbos.

His take was that as long as there is oil the bearings are in no danger and will probably get some more use out of the turbos. I am still thinking about changing them,however, or I should say getting them rebuilt while I have the exhaust system apart.

So does that mean simply replacing the seals is a fix?

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Old 06-08-2016, 07:55 AM   #46
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Have you checked crank case psi. It's a possibility that your current setup is causing a restriction when you are running hard. Increased crank case psi can cause seals to leak that normally wouldn't.
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Old 06-08-2016, 08:17 AM   #47
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ranger42c,

I am waiting for Tony Athens from Boat Diesel to weigh in. My analysis may be flawed, although it seems to be logical.

Boy, I have got to stop using the ipad and iphone for email and messaging.

I'll let you know what I do.

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Old 06-08-2016, 09:19 AM   #48
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If a liquid trap is formed in the long blowby vent line, blowby gasses will have to build some pressure to work past the liquid trap. This will pressurize crankcase slightly and force oil out the compressor shaft seal.

The other possibility is the mist being drawn back into engine room where it is ingested by the turbo compressors, but if that is a 20 foot hose it does not sound likely.
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Old 06-08-2016, 04:32 PM   #49
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crank case vent

With the idea that a lot of methods are interesting, may even be
inspirational, though not directly applicable, here is a picture.

The engine is a Cat 3406. The vent tube is 1 1/2 or 2 inch, it
follows the exhaust pipe (dry) to exit through the stack on the cabin top.

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Old 06-08-2016, 06:30 PM   #50
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With the idea that a lot of methods are interesting, may even be
inspirational, though not directly applicable, here is a picture.

The engine is a Cat 3406. The vent tube is 1 1/2 or 2 inch, it
follows the exhaust pipe (dry) to exit through the stack on the cabin top.

Ted
That is certainly one way to do it!!!! I have engine envy. The Cat 3406 is about as good as it gets when it comes to higher powered marine diesels(I am a big QSM fan as well)!!!
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Old 06-08-2016, 06:47 PM   #51
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Baker,
That engine isn't mine, it's in a boat I looked at, seriously, before
I got Okisollo.
Okisollo has a turbo charged D353 Cat, same hp at a lower rpm.

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Old 06-08-2016, 07:01 PM   #52
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Cat 353... Drool. That's a real engine.
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Old 06-08-2016, 09:31 PM   #53
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Damn turbos! Glad I don't have any.
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Old 06-09-2016, 02:09 AM   #54
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My only experience with turbos is two turbo cars, but I'm tempted to just say, if he has boost pressure, he is not burning excessive oil, and none is spraying round the ER, then he's good to go - it is cosmetic only, and worth trying to prevent via the various suggestions made, but by and large he can and should, be getting out there asap.

Checking to excess crankcase pressure makes sense, and if absent, possibly the oil feed lines to the turbo's bearings are leaking, and a little oil can go a long way when stirred up by heat and movement, making where it comes from not always obvious. (Bitter experience) But it sounds like overkill to just rebuild what might be fine turbos with a simple issue only.
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Old 06-09-2016, 09:39 PM   #55
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I have to say I am so far disappointed in the response to my query from Boat Diesel. Ski seems to have the best idea what is going on. Tony Athens can't seem to follow the thread from one day to the next, or, I am being impatient.

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Old 06-09-2016, 10:45 PM   #56
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I have to say I am so far disappointed in the response to my query from Boat Diesel. Ski seems to have the best idea what is going on. Tony Athens can't seem to follow the thread from one day to the next, or, I am being impatient.
Don't bite the hand...
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Old 06-10-2016, 07:17 AM   #57
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I am being impatient.

Gordon
Yes you are. I have been a boatdiesel member for more than 10 years. Tony wants all the fact before he makes a recommendation. He won't do it with only partial sketchy information.
Plus he has a business to run. He openly volunteers expert advice.
You need to respect that.
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Old 06-10-2016, 08:20 AM   #58
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I take back all said. I thought this was part of his business, and did not understand that he was an unpaid volunteer. I do respect that.

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Old 06-10-2016, 08:49 AM   #59
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I take back all said. I thought this was part of his business, and did not understand that he was an unpaid volunteer. I do respect that.

Gordon
No harm no foul
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