8.2L Detroit Diesel using oil
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BoatRDavid
Oct 3, 2010, 4:34:54 PM10/3/10
to UnifliteWorld
My Uniflite (’84,42’,SE II) is powered by 8.2L Detroit Diesels.
Starting this year (2010) I have noticed an oil slick that comes from
the exhaust of my Starboard engine. I also noticed that when I first
rev up that engine (to set the alternator to charge) I get a puff of
white smoke. I just finished an annual, 10-day, cruise and I have
been plagued by the oil slick and the oil consumption on that STBD
engine. I have been worried about the engine as long as I have owned
the boat because it is older than the Port engine (indicating that
some former owner may have abused them) and it exhibits low oil
pressure (~40 psi which drops to nil at idle) and has always use oil
more so than the newer Port engine.
This latest excessive use of oil is unacceptable and I am thinking
about a rebuild or replacement. The engine has about 1850 hours. The
oil definitely ends up out the exhaust and on to the water. My first
thought is about blow-by. Now I’m wondering if there is somewhere
that a seal could have gone bad allowing the oil into the exhaust, say
in or around the turbo charger. I am going to check the actual oil
pressure, but I don’t know what else to do, and that doesn’t suggest
anything about the cause of the excessive usage.
Now that I am writing this down it has accrued to me that I am not
burning the oil. There is no smoke! And, there is no blow-by present
at the breather. There is no dripping or leaking oil from the
engine. There is just a lot of oil being dumped into the exhaust –
like a couple of quarts each day.
Does anyone have any suggestions? I have yet to find a mechanic in
the SF Bay Area that truly know about the marine version of this
engine (but I’m about to try again).
DavidO
Starting this year (2010) I have noticed an oil slick that comes from
the exhaust of my Starboard engine. I also noticed that when I first
rev up that engine (to set the alternator to charge) I get a puff of
white smoke. I just finished an annual, 10-day, cruise and I have
been plagued by the oil slick and the oil consumption on that STBD
engine. I have been worried about the engine as long as I have owned
the boat because it is older than the Port engine (indicating that
some former owner may have abused them) and it exhibits low oil
pressure (~40 psi which drops to nil at idle) and has always use oil
more so than the newer Port engine.
This latest excessive use of oil is unacceptable and I am thinking
about a rebuild or replacement. The engine has about 1850 hours. The
oil definitely ends up out the exhaust and on to the water. My first
thought is about blow-by. Now I’m wondering if there is somewhere
that a seal could have gone bad allowing the oil into the exhaust, say
in or around the turbo charger. I am going to check the actual oil
pressure, but I don’t know what else to do, and that doesn’t suggest
anything about the cause of the excessive usage.
Now that I am writing this down it has accrued to me that I am not
burning the oil. There is no smoke! And, there is no blow-by present
at the breather. There is no dripping or leaking oil from the
engine. There is just a lot of oil being dumped into the exhaust –
like a couple of quarts each day.
Does anyone have any suggestions? I have yet to find a mechanic in
the SF Bay Area that truly know about the marine version of this
engine (but I’m about to try again).
DavidO
e b
Oct 3, 2010, 4:47:21 PM10/3/10
to unifli...@googlegroups.com
my guess is the engine oil cooler has a pinhole in it... since oil pressure
is higher than water pressure, water does not enter the oil system. your raw
water leaves the cooler and then goes into your exhaust and overboard... and you
see a slick on one side...
that’s my first thought ( it happenned to me )
Eric
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ROGER YOUNG
Oct 3, 2010, 7:43:29 PM10/3/10
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David: Check out the turbocharger on the exhaust side and look for oil at the turbo fins. The turbo seals could be finished and that could be the oil consumption. Check the inlet side or compressor side for damage to the fins on the turbo. The air cleaner could be plugged and the engine might be starving for air. If the turbo is ok then a cylinder could be the problem as it might have been overheated and scored a cylinder wall which would have damaged the bore and affected the rings. Having worked on these gems many years ago I have come across some of these problems.
----- Original Message -----
From: BoatRDavid <oate...@pacbell.net>
Date: Sunday, October 3, 2010 1:34 pm
Subject: [UnifliteWorld] 8.2L Detroit Diesel using oil
Regards
Roger
----- Original Message -----
From: BoatRDavid <oate...@pacbell.net>
Date: Sunday, October 3, 2010 1:34 pm
Subject: [UnifliteWorld] 8.2L Detroit Diesel using oil
> somewherethat a seal could have gone bad allowing the oil into
> the exhaust, say
> in or around the turbo charger. I am going to check the
> actual oil
> pressure, but I don’t know what else to do, and that doesn’t suggest
> anything about the cause of the excessive usage.
>
> Now that I am writing this down it has accrued to me that I am not
> burning the oil. There is no smoke! And, there is no
> blow-by present
> at the breather. There is no dripping or leaking oil from the
> engine. There is just a lot of oil being dumped into the
> exhaust –
> like a couple of quarts each day.
>
> Does anyone have any suggestions? I have yet to find a
> mechanic in
> the SF Bay Area that truly know about the marine version of this
> engine (but I’m about to try again).
>
> DavidO
>
> in or around the turbo charger. I am going to check the
> actual oil
> pressure, but I don’t know what else to do, and that doesn’t suggest
> anything about the cause of the excessive usage.
>
> Now that I am writing this down it has accrued to me that I am not
> burning the oil. There is no smoke! And, there is no
> blow-by present
> at the breather. There is no dripping or leaking oil from the
> engine. There is just a lot of oil being dumped into the
> exhaust –
> like a couple of quarts each day.
>
> Does anyone have any suggestions? I have yet to find a
> mechanic in
> the SF Bay Area that truly know about the marine version of this
> engine (but I’m about to try again).
>
> DavidO
>
> --
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> You received this message because you are subscribed to the
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David Oates
Oct 4, 2010, 10:51:08 AM10/4/10
to unifli...@googlegroups.com
| Eric, that's very interesting. Is there a way to determine if that is happening? It is extremely difficult to reach/remove the oil cooler on that engine. That in itself is a positive indicator that being the problem - Ha Ha. |
David Oates
Oct 4, 2010, 10:58:57 AM10/4/10
to unifli...@googlegroups.com
| Roger, I do intend to check the turbo. Thank for the pointers about what to look for. I am also interested in Eric's suggestion about a "pin" size leak in the oil cooler; however, the oil cooler is so difficult to get to I may check the turbo first (I had it rebuilt when I bought the boat 4 years ago). It's good to here from someone that has worked on "these gems". |
|
e b
Oct 4, 2010, 5:36:23 PM10/4/10
to unifli...@googlegroups.com
a pressure test is the best way. if its is piped in with flexible oil
lines, simply remove the lines, plug one side of the cooler ( or the end of the
lines if it is easier ) and install a fitting with a gauge on the other
side and pressurize the cooler, it should be safe to 120 psi or more but im
sure 60 psi will be plenty.. if it doesn’t hold pressure its bad.. if it is
simpler you can do the opposite, pressurize the raw water side of the cooler the
same way, by plugging both ends, the air will then enter the oil side of the
cooler / engine but wont do any harm...
David Oates
Oct 4, 2010, 5:39:10 PM10/4/10
to unifli...@googlegroups.com
| Thanks, when I get back to the boat, I will look into that process. DavidO |
BoatRDavid
Oct 5, 2010, 1:19:30 PM10/5/10
to UnifliteWorld
DavidO here again. I was just writing to a friend about the idea of a
leak in the oil cooler allowing oil into the cooling water and thus
out the exhaust. As I was writing, I realized that my oil coolers are
in the coolant system and not the raw water side. Therefore there is
no way for the oil to enter the exhaust. So I am back to checking the
turbo seals. I will keep all informed of my findings.
DavidO
On Oct 4, 2:39 pm, David Oates <oates...@pacbell.net> wrote:
> Thanks, when I get back to the boat, I will look into that process.
>
> DavidO
>
> --- On Mon, 10/4/10, e b <gon2...@msn.com> wrote:
> --- On Sun, 10/3/10, e b <gon2...@msn.com> wrote:
> more options, visit this group athttp://groups.google.com/group/unifliteworld?hl=en.
leak in the oil cooler allowing oil into the cooling water and thus
out the exhaust. As I was writing, I realized that my oil coolers are
in the coolant system and not the raw water side. Therefore there is
no way for the oil to enter the exhaust. So I am back to checking the
turbo seals. I will keep all informed of my findings.
DavidO
On Oct 4, 2:39 pm, David Oates <oates...@pacbell.net> wrote:
> Thanks, when I get back to the boat, I will look into that process.
>
> DavidO
>
>
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ROGER YOUNG
Oct 6, 2010, 12:13:16 AM10/6/10
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David: after you check the turbo and if you have time can you get at the manifolds and remove them which is probably what you not want to hear but it should give you which cylinder is pumping oil. This is the quickest way to check even though it requires some work. Hope it is only the turbo
Regards
Roger
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BoatRDavid
Oct 23, 2010, 11:46:05 AM10/23/10
to UnifliteWorld
Here is an update on my oil using 8.2L Detroit Diesel (the 4-cycle
DD). You may remember that I noticed that the engine isn’t burning
oil, but passing it out to the sea via the exhaust.
I have inspected the engine(s) and read the Service Manual. All of
the engine parts are cooled via the coolant system (i.e. no raw water
ever touches the inside of the engine), EXCEPT for a large rectangular
box that apparently cools (?) the air coming from the turbo compressor
and going to the engine intake. The raw water leaves the opposite end
of the “box” and goes directly into the exhaust elbow that is
immediately after the turbo compressor housing. The box” is not
mentioned in the Service Manual nor is it shown in any of the engine
pictures I have found. There is no oil line attached to the box.
That leaves the oil leak to be found in the turbocharger oil seals
(compressor side).
The good new is I don’t have to worry about R&R the engine or the
suggested parts such as the oil cooler, the heads or the exhaust
manifolds.
I have to make a 200 nm run before I can remove the turbo, so I don’t
have an end to this story yet. I will just have to keep adding oil
until the trip is over.
DavidO
DD). You may remember that I noticed that the engine isn’t burning
oil, but passing it out to the sea via the exhaust.
I have inspected the engine(s) and read the Service Manual. All of
the engine parts are cooled via the coolant system (i.e. no raw water
ever touches the inside of the engine), EXCEPT for a large rectangular
box that apparently cools (?) the air coming from the turbo compressor
and going to the engine intake. The raw water leaves the opposite end
of the “box” and goes directly into the exhaust elbow that is
immediately after the turbo compressor housing. The box” is not
mentioned in the Service Manual nor is it shown in any of the engine
pictures I have found. There is no oil line attached to the box.
That leaves the oil leak to be found in the turbocharger oil seals
(compressor side).
The good new is I don’t have to worry about R&R the engine or the
suggested parts such as the oil cooler, the heads or the exhaust
manifolds.
I have to make a 200 nm run before I can remove the turbo, so I don’t
have an end to this story yet. I will just have to keep adding oil
until the trip is over.
DavidO
David Oates
Oct 23, 2010, 4:15:25 PM10/23/10
to unifli...@googlegroups.com
| Oops! My proceeding message had an error. The second paragraph should have ended with, "(turbine side)." DavidO --- On Sat, 10/23/10, BoatRDavid <oate...@pacbell.net> wrote: |
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