turbocharger/engine problems?

[tuggin aweigh]

I have read posts concerning the failure/problems with turbo chargers on the Yanmar 110. The original post and following discussion was found under the topic of fuel flow meters, etc. Are there other boaters that have experienced any problems with their Yanmar. Although I have not experienced any problems with our Yanmar, I am certainly interested in others experience.

Tuggin Aweigh

 

[RDragon]

Recently noticed some small loss of power/overheating issues. Had hatton Marine down. Suppossedly a significant amount of growth in the heat exchanger was problem. After a quick boil and a huge decrease in the boat account. Seems to be better.

However, there was a fair amount of oil found in and around the intercooler. Never got a good explanation of this. Also, now seeing black soot in some of the interior spaces...Has been associated with bad gaskets/failure of turbo...I am at a loss. If not the problem...pulling the turbo and evaling will completely drain may maintenance fund :? Love to hear any other thoughts!

Drew

 

[Levitation]

Check with Yanmar for a repair manual on your turbo... Their are also sources on the web for books and videos on turbo maintenance and repair... Spend some of the maintenance kitty on a box of tools and get your finger nails grungy.. When the going gets tough the boater gets dirty...

denny-o

 

[RDragon]

Denny,

Great thought!
I like to think of the engine, in the same way as I do the heart. I can do some pretty basic PM, however if cardiac surgery is needed, I think it is much better for the professional to do my 3 way bypass! JMHO. Hope all are having a great day.

Drew :geek:

 

[rt11002003]

My first exposure to turbos was the Chevy Corvair Spyder (1965?). My friend's parents bought his sister one for her HS graduation. He drove a new Porsche 356C. We got to check out the new car. Fun. 😀

My most recent experience has been with two Audi TTs, an Audi AllRoad and the Yanmar in my Albin 27 AC.

Lessons learned over 43 years: keep the oil at the proper level and keep it clean, allow the turbo to cool down after running it hard (if you don't the oil in the bearings will burn, "coke", and troubles will follow), keep things within normal operating temp, over temp is a killer as is undertemp of oil in diesel engines. Main advice: read the manual and operate the engine accordingly.

Good advice: learn to do some of the maintenance, both for economics and emergencies. I have trouble finding a diesel mechanic here at home; I'd hate to look for one in some foresaken area.

Gene

 

[tuggin aweigh]

"allow the turbo to cool down after running it hard (if you don't the oil in the bearings will burn, "coke", and troubles will follow"
As an additional precaution for the prevention of over heating the oil around the bearings what about using Mobil 1 or another quality synthetic motor oil?

Do I remember Corvair Spyders? I wanted one in the worst way. It boiled down to a college degree in 4 years or a new Corvair. After a brief--(real brief as I remember) discussion with my parents, I started college in the fall. Nuf said.

Tuggin Aweigh

 

[captd]

One thing to keep in mind......Rnning your boat too slow with out kicking in the turbo is bad news. Before shutting down after a slow run be sure to run up the rpm's all the way up right at the dock. I have a friend that has his boat up for sale and it is parked in his yard. He would start it from time to time. Let it idle for a half hour. during a sea trial it smoked and run terrible. The turbo was froze up. Lost a sale. Yanmar man told me to run wide open on a regular basis.

captd

 

[rt11002003]

I've noticed a lot of turbo equipped cars have oil temp gages. I suspect both low and high temp are issues.

Some of the responses seem to support that idea.

Gene

 

[bbrh842]

Below are some excerpts from the Yanmar Operating Manual.
Too bad Yanmar doesn't define "low speed".
I wouldn't consider 2000 rpm, where a lot of folks admit to operating, low speed.
Also, the Yanmar manual reinforces what someone else mentioned, that you shouldn't go from wide open to stopped without letting the engine cool off for a few minutes.
I would guess a normal approach to the dock, or to your favorite anchoring spot, would satisfy the 5 minute rule.
I don't see anywhere that Yanmar suggests, if you don't run wide open at all times, the turbo will be ruined.
Yanmar DOES seem to suggest, that running at high rpm from time to time, may be theraputic to the engine.

It would be interesting to see some more posts from folks that have a lot of hours on their engine.
What is their usual cruising RPM, and any problems??

Excepts from Yanmar Operating Manual are below.

• When operating the engine at low
speed for long periods of time, race
the engine once every 2 hours.
Note: Racing the engine with the
clutch in NEUTRAL, accelerate
from the low speed position to
the high speed position and
repeat this process about 5
times. This is done to clean out
carbon from the cylinders and
the fuel injection valve.
Neglecting to race the engine
will result in poor exhaust color
and reduce engine performance.
• If possible, periodically operate the
engine at near maximum speed, while
underway. This will generate higher
exhaust temperatures, which will help
clean out hard carbon deposits,
maintaining engine performance and
prolonging the life of the engine.

For maximum engine life,
Yanmar recommends that when
shutting the engine down, you
allow the engine to run, without
load, for five minutes. This will
allow the engine components
that operate at high
temperatures, such as the
exhaust system, to cool slightly
before the engine itself is shut
down.

IMPORTANT
Avoid engine damage. Do not stop
engine abruptly during operation.
1. Reduce engine speed to low idle and
put remote control handle in
NEUTRAL.
2. Accelerate from low speed position to
high speed position and repeat five
times. This will clean out the carbon
from the cylinders and the fuel injection
nozzles.
3. Allow engine to run at low speed
(approximately 1000 min-1) without load
for 5 minutes.

 

[Snug Tug]

There is another message thread titled "fuel flow meters, etc" where someone mentioned a problem with a Yanmar 125 hp that had an overheated turbo due to too much water bypassing the turbo cooling circuit into the cabin heater and water heater. I assume the solution was to throttle the flow (put a restriction in the line to the heater) so that more water went to the turbo. Is this necessary on the 110 hp too? Does the Ranger Factory now put a flow reducer there?

I have noticed a spot on the turbo where the paint has come off a bit and a little surface rust is showing. I measured the temp at the turbo with a remote reading infrared thermometer and the hot spot at full throttle (3200 rpm) was about 420 deg. F just behind the exhaust turbo on the bearing side, which is where the paint showed the most discoloration. The temp at the center of the bearing area halfway between the exhaust turbine and inlet turbine was about 300 deg. F. The temperature of the oil on the inside must be above 300 deg. F for the outside surface to be that hot. The problem is that I have no idea what temps are considered normal and what temps are considered too hot?

At 1800 rpm the hot spot is only 240 deg. F and the center of the bearing area is 195 deg. F. These temps may be too cool for full-time operation. I wonder what the "right" temp is?

Also, at 3000 rpm (where I have sometimes run for many hours continously) the hot spot is about 390 deg. F and the center of the bearing area is about 265 deg. F.

All of the above temps were measured during a short run at each rpm value. Temps may actually creep higher on a longer run. I'll check that on our next longer trip.

Our Yanmar 110 engine has 590 hours on it and we run mostly at low speed (1800 - 1900 rpm) with an occasional day at 3000 rpm when we're running ahead of bad weather or get impatient. On our trip to the Rideau Canal and Montreal earlier this spring, we ran mostly at 1800 -1900 rpm through the canals and didn't always have a chance to make a high speed run every day. So far, no problems that we know of. We do follow the operating guidelines and let the engine cool down slowly before shutting down but we don't always have a chance to run it at full speed every few hours as some have recommended. What's a boater to do??

I would be interested to know if the problem with the 125 hp mentioned at the beginning of this post also applies to the 110hp??