Love those old 2 stroke Detroits!
Nothing like the sound of one of those screaming away....

Here is a great site for marine diesels:
http://boatdiesel.com/Forums

Those old Detroits will always smoke more than a modern design.
Black smoke = fuel rich (worn injectors )

The 2 stroke Detroits have NO injector pump, so that is not an issue.

Those engines will suck as much air as they need - I put zero creedence in
the not enough air theory.

Again, those engines awlays are pretty smoky. If the injectors are OK, and
you are running diesel with a high enough Cetane, learn to love the smoke.



"Capt. Dan" wrote in message
om...
have purchased a 46 ft. Viking Sportfish.. 1984 Detroit 892 Turbo
Hull No. ID

Both engines have been completely overhauled last spring and have
apprx. 450 hours on them.. Boat performs well while underload at 1950
rpm it cruises at 20-21 knotts. At 2350 rpm boat can run 24-25
knotts. No load engines run rpm up to 2650

After several months and various mechanics in Freeport,Texas,
LaMarque,Texas, Galveston,Texas I still have a problem with engine
smoking diesel. Enjectors have been calibrated and adjusted, but when
boat is loaded with 900 gallons diesel, 80 gallons of water, and 8
fisherman with supplies, we find the engines smoke (both) while
underway.. Unless the boat is on top of the water and cruising at
least 1800 rpm (17knotts) we have very bad diesel smoke problem.
Dreadfull smoking at low speeds, but when boat is running high rpm and
cruise at 19-21 knotts we have less smoking, but still too much as the
smoke covers the transom and back of boat within 8 hours. We are not
burning any Oil while running. If any, less than 2 quarts per 24 hours
of cruising.

I clean the air filters (4) before every trip out, but we still find
black diesel smoke all over the boat.
I am at an impasse as what the problem is. Everyone seems to have
ideas and suggestions, but nothing is resolved. I have owned the boat
for over a year and spent time and money on upgrades, cosmetics,
electronics, and engine rebuild, new wheels and tuneup of wheels per
Hood Marine Propeller Shop in Houston,Texas..

I recently looked at pictures of 1982-83 Viking 46 and picture showed
that there were air scoops and ventilation to engine room on outside
of hull.. 1984-1985 model (like mine) have air ventilation in
cockpit.. When the 47 ft. Viking came out the next year, the
ventilation was back on the outside of cockpit and on the side Hull
as years previous.

Is this a cause of the black smoke on my 46 Viking? Am I not getting
enough air into the engine room. Everything is standard equipment, but
this could be a problem.. Can you lend any assistance or advise