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Replying to Thread:

Little turbo leak..........Overhaul the engine?


Created On Saturday 8, July, 2017 5:29 AM by gusshr

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Diesel Talk Forum

gusshr
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Note Saturday July 08, 2017 05:29 View thread in raw text format
Diesel Talk
Hi,

Finished oil changes heat exchanger cleaning, and was on for the last item of maintenance "a small turbo leak" that is causing smoke in the engine room when run hard (the oil burn on the outside of the riser) because the gravity is guiding the dripping oil underneath the riser´s blanket on this 8V71ti with 3100 hours. (it leaks only after it cools down not during run)

So pulled the turbo for rebuild, and there is damage to the exhaust side and the turbo guys at metro diesel in Miami said it cannot be balanced (dinged outer skirt blades), I called my mechanic and he said STOP, do not get a rebuild one as the new one will be damaged too. Lets look in the engine air box hatches to see whats wrong.

Now this engine smokes very tiny white smoke on startup but disappears after 5 min run. Otherwise it sounds fine and had no other issues. A high crank case pressure was detected on both engines actually up to 3.5" at the time of the engine survey on this boat.

I asked around and everyone told me as long as the engine starts right up and does not smoke and as long as it runs hard fine then don´t worry about that.

Knowing some about the engines mechanics, I had a discussion with my mechanic (who seems little pessimistic) that if we found anything wrong with further investigation then it will be a major overhaul, and he confirmed.

Now the question is: other than this small leak and the fact that we found dinged exhaust turbo blades, do I really wanna pursue this problem to the source and potentially perform a major overhaul? Would you do that too?

The mechanic says you put a newer turbo it will be damaged again, and maybe you end up with broken block. My logic tells me a piece had passed by that turbo ( I had no good history on this boat), I am not sure if this damage had been there for years or happened in the last 100 hours that I have used this boat for so far. Could another piece pass by? yes anything is possible. Could another damage happen anytime? and my answer is yes this is an engine from 1972 I am not going to make new again.

Please advice on what you would do?

Thanks


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8V71 TI
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egantrucking
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Joined: Dec 2007

Note Sunday July 09, 2017 05:25 View thread in raw text format
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Since no one is replying, I'll give you my opinion. I'm no expert but I've worked on a lot of motors all my life. I'm not exactly sure I am following all the problems in your post.

You said there are "dinged outer skirt blades" only on the exhaust side of the turbo, are they 'rubbing' because the turbo bearing is bad? That could explain your oil leak too. But if not and some type of material went through the turbo fan, then you have a serious mechanical problem(In my opinion). Are the turbo fins only damaged on the exhaust side of the turbo? Anyone run the motors without air cleaners? You said they tested the crankcase pressures and they were high, I wonder if they do individual cylinder compression testing or "leak down testing" on that type of motor. Try to pinpoint a problem. If the crankcase pressures are high, it most likely means your cylinder/s are not sealing and that should be fixed. Is your oil consumption within the manufactures range?

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michael egan
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gusshr
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Note Sunday July 09, 2017 05:38 View thread in raw text format
Diesel Talk
Since no one is replying, I'll give you my opinion. ......THANKS
I'm no expert but I've worked on a lot of motors all my life. I'm not exactly sure I am following all the problems in your post.

You said there are "dinged outer skirt blades" only on the exhaust side of the turbo, are they 'rubbing' because the turbo bearing is bad? That could explain your oil leak too. THE DAMAGE SEEMS TO BE RESULTING FROM A FOREIGN BODY THAT WENT THROUGH THE TURBO


But if not and some type of material went through the turbo fan, then you have a serious mechanical problem(In my opinion). I UNDERSTAND THE POTENTIAL PROBLEM, BUT LESS THAN ADEQUATE HISTORY PROVIDED, THIS MAYBE VERY OLD AND THE INCITING PROBLEM MAY HAVE BEEN FIXED 10 YEARS AGO AND NO PAID ATTENTION TO THE TURBO BLADES. FOR SURE, WHEN I GOT THE BOAT AND PUT ON IT 100 HOURS SO FAR, THE OIL WAS LEAKING FROM DAY ONE, THAT MEANS THE INJURY IS OLD. NO ENGINE NOISE, NO SHAKES, AND ONLY MINIMUM WHITE/BLUS SMOKE FOR THE FIRST 5 MIN ON WAKE UP.

Are the turbo fins only damaged on the exhaust side of the turbo? YES THEY ARE ONLY ON ONE SIDE

Anyone run the motors without air cleaners? MAYBE SOMEONE DID IN THE PAST, I DON'T KNOW

You said they tested the crankcase pressures and they were high, I wonder if they do individual cylinder compression testing or "leak down testing" on that type of motor. THEY DO COMPRESSION TEST, I NEVER HAD ONE

Try to pinpoint a problem. If the crankcase pressures are high, it most likely means your cylinder/s are not sealing and that should be fixed. IS THERE ANY FIX OTHER THAN MAJOR OVERHAUL? AND THATS WHERE MY DELIMA IS: DO YOU REALLY DO MAJOR OVERHAUL FOR SUCH MINIMUM SYMPTOMS?

Is your oil consumption within the manufactures range? YES VERY LOW OIL CONSUMPTION.

You see this could have been a problem that was fixed long time ago, because if we still have a broken valve or something worse, there should be other signs? don't you think?


Thanks for your reply.


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8V71 TI
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egantrucking
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Note Sunday July 09, 2017 09:43 View thread in raw text format
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If a foreign body from outside the motor went through the turbo, there most likely would be signs of damage on both sides of the turbo. (fresh air and exhaust). Of course I do not know how damaged the fins are. Is there any movement of the fan shaft side to side? (In and out shaft play is normal) Can you make the fan contact the housing?

Leaking oil is most likely the oil seal but I know on trucks, if there is incomplete combustion, like at long periods of idle, black 'looking' oil can leak out the exhaust around the turbo. I'm not sure if this has been considered.

Does the damage on the fins look old? Does it have the same looking soot build up as the rest of the fan? Or are there shinny spots on the fan or fan housing?







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michael egan
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westcoast
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Note Monday September 18, 2017 03:49 View users profile View thread in raw text format
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Well said Michael , make sure your air box drains aren't hooked into your sump check compression if no fault put a me turbo on and run it regards david

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detroit
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