Northern Lights OL1276 L1276A2 User manual

L1276A2
• Oil drain outlets
on both sides of pan.
Oil change pump is
optional.
• Side lube oil fill.
Fills and dipstick
available on both
sides of engine.
• 24 volt battery charging
alternator. 12 volt is optional.
• Fuel filter
with drain.
• Large, cast
expansion tank.
Easy coolant
fill. No welds
to break.
• Sparkling white
IMRON®polyurethane
paint for a tough finish.
L1276A2
Single Side Service.
• Spin-on oil filter
with both full flow and
bypass elements in
one can.
• Crankshaft designed for an
electric clutch PTO.
• Jacket-water cooled, cast
iron exhaust manifold. Two
pass coolant flow for even
temperature control.
• Turbocharger
is jacket water
cooled for
safety.
Optional
wet and
dry exhaust
elbows
available.
• Overhead cam and four valves
per cylinder. Fewer moving
parts, better air flow, and higher
performance.
• 11 gallon oil pan.
• Plate type
engine oil
cooler.
• Closed loop crank
case vent for a clean
engine room.
Reliability, simplicity and durability
from more cubic inches and lower RPM.
High rpm, high performance throw-away
diesels have their place in planing pleasure
craft that rarely get too far from the local yacht
club. But why put one of these engines, even
a derated version, in your commercial boat or
long range cruising yacht? These vessels need
a real, heavy duty diesel that produces high, prop
twisting torque at a rational rpm. They need a
conservatively rated engine with long life features
like the L1276A2.
A commercial heritage
Initially designed for Alaskan fishermen,
Luggers have always been dependable.
Used as prime movers on Northern Lights
marine generator sets, they are well known by
commercial and pleasure craft owners for long
life and smooth, quiet operation. Today,
electronic fuel injected engines
like this L1276A2 are adding US
EPA Tier II compliance to Lugger’s
reputation for reliability, simplicity
and durability.
Ironclad marinization
The L1276A2 has a heavy-duty, overhead cam
tractor block. This high torque design provides
a strong foundation; but a marine engine is only
as good as its marinization. The materials used
must be strong. The design must be clean. Look
at the photo below. Note the lack of hoses, belts,
gaskets and welded cooling components. The
liquid-cooled exhaust manifold is cast iron to
withstand temperature fluctuations and resist
electrolysis. Unlike some engines that only use
bypass water, the 1276 manifold is integrated
into the cooling system mainstream, and two-
pass water flow assures even temperature
control and eliminates hot spots. The piping
is stainless steel or bronze as is the gear
driven raw water pump. The heat exchangers
for the engine and gear have cupro-nickel
elements.
Low rpm horses vs. Paper ponies.
Light-duty, small-displacement diesels are
rated at speeds up to 3000 rpm. This means
high piston speeds, more wear and short life.
The 1276’s power comes from its big 766
cubic inch displacement and long stroke
design. Max rpm is only 2100. Cruise RPM
is 1800 for the continuous rating or 1900 for
medium and high output. Lower rpm also
means less noise and wear, more complete
fuel combustion and longer life.
Wet liners protect your investment.
Lugger cylinder liners are surrounded by
coolant for better heat dissipation. The liners
are replaceable to reduce overhaul costs.
Unlike “linerless” throwaways, a Lugger can
be rebuilt to factory specs in the boat.
Gently turbocharged and aftercooled.
The turbocharger is liquid-cooled for safety.
The aftercooler uses jacket water so the
intake air temp is controlled thermostatically
to avoid over cooling. Over cooling can cause
incomplete combustion and smoke.
Electronic engine control lower fuel costs.
ECU controlled, direct fuel injection, four
valves per cylinder, centered unit injectors and
precise fuel metering all add up to excellent fuel
economy.
Easy to live with.
Low rpm Lugger engines are naturally quiet. No
high rpm whine. Just a steady rhythm. A special
silencer-filter reduces air intake noise. Quiet and
smooth; 1276’s torsional dampener decreases
engine vibration.
Easy to maintain too. Service points are on one
side for easy access. The in-line design gives you
elbow room in the engine space.
Take power from both ends.
The full line of options and accessories lets
you design an engine that is custom built to
match your vessel’s needs. With an optional
front power-take-off your Lugger can power your
vessel’s hydraulic auxiliary systems. It’s more
than an engine, your L1276 is a total marine
power system.
340 /1800 rpm
Continuous
425/2100 rpm
Medium Duty
525/2100 rpm
High Output
HORSEPOWER
• Cupro-nickel
heat exchanger.
• Beltguard protects
the operator.
• Cupro-nicklel gear
oil cooler.

These are the features tha
Engine Block
• Six cylinder, in-line, four cycle, liquid cooled,
overhead cam, four valve, marine diesel
with a heavy-duty, cast iron, industrial-grade
engine block.
• Replaceable, wet
type cylinder liners
are hardened
and precision
machined for
long life. Engine
is rebuildable to
original factory
specifications.
• Liquid cooled cylinder liner top reduces
temperatures by up to 130°F (72°C) for
durability and head gasket life.
• Balanced, forged crankshaft with induction
hardened journals for long life.
• Replaceable valve seats and guides.
• Four valves per
cylinder increase air
flow and allow unit
fuel injector to be
placed in the center
of the cylinder for an
optimal fuel spray
pattern. Electronic
fuel valve for precise
fuel delivery.
L1276A2 Non Service Side
• Closed loop crankcase vent
keeps oil vapors inside engine.
• Cast bronze and
stainless steel
seawater piping.
• Electronically controlled, unit type, fuel
injectors protected by valve cover. Precise
fuel injection, improved fuel economy and low
emissions.
• Electronically controlled unit injectors
provide precise fuel delivery with variable
timing for excellent fuel economy and
performance. Pilot injection reduces cold
start smoke and noise.
• Camshaft driven,
gear type fuel
pump.
• High capacity fuel
filter with air bleed,
drain, manual fuel
priming pump and
water sensor.
Cooling System
• Cooling system available in heat exchanger
or keel cooled configuration.
• Two thermostats for safety and quicker
warm-ups.
• Cast-iron exhaust manifold has double pass
jacket water
flow for even
temperature
control, fast
warm-up and
no hot spots.
Manifold is in
the main, full
flow, jacket water circuit.
• Gear driven, coolant circulation pump.
• Overhead camshaft reduces the valve
train parts and improves performance.
Camshaft is gear driven; no chains or
timing belt to worry about. Large camshaft
journals and bearings for long life. Large
roller cam followers.
• Cast aluminum, “floating” valve cover blocks
valve train noise. Cover is removable with
three bolts for quick service access.
• Articulated pistons with high strength steel
crown and aluminum skirt for long life
under high loads.
• Torsional crankshaft vibration damper.
• SAE 1 flywheel housing is standard.
Electronic Fuel Injection System
• Electronic engine control unit includes fuel
temperature compensation
• Engine diagnostics, monitors critical
engine functions.
• Gear driven,
SAE A, 9 tooth
auxiliary drive
provides up to 75
foot pounds of
torque to power
hydraulic pumps.
• Beltguard for
operator safety.
• Cupro-nickel
engine cooling
heat exchanger.
• Large, cast expansion
tank. Easy coolant fill.
No welds to break.
• Cupro-nickel
gear oil cooler
• Air filter
silences
intake.
• Jacket water
aftercooler for
increased output.
• 24 volt
starter placed
high and dry.
• Electronic controls. Water
resistant module protects
engine control unit for
electronic fuel injection and
ESP engine system profiler.
• Gear driven, bronze and stain-
less seawater pump.
No belt. Easy impeller change.
• Optional secondary oil fill

t make a good engine block into a great marine engine.
Use these components to make your
Lugger into an intregated power system that
fits your vessel’s special requirements.
• Flybridge and auxiliary instrument panels
with wire harness plug-ins are easy to
install.
• 40 and 60 foot wiring harness extensions.
• High output primary
alternators: 24V/100 A
or 24V/175 A.
• Second alternator:
24V/75A or 12V/140A
• DC electrical systems.
24 V isolated ground.
12V isolated or
standard ground.
• Wet Exhaust: 0-15° and
15-75° from vertical, 6”
and 8” stainless steel
wet exhaust elbows.
• Dry exhaust: 5” and 6”
dry exhaust elbows.
5” x 24” and 6” x 24”
stainless steel exhaust
compensators. 5” x 24”
and 6” x 24” stainless
exhaust flex. Turbo
outlet weld flange.
• Oil change pump.
• SAE 1 rear flywheel
housing Std. SAE 2 Opt.
• Racor fuel filters.
• Crankshaft pulleys:
3-A/B or 4-A grooves.
• Twin Disc or ZF marine
gears. Trolling valves.
Shaft couplings.
• Spare parts kits.
• Flexible vibration
isolating engine
mounts.
• Coolant level sensor.
• Front PTO with 12 or
24 volt electric clutch
and SAE C splined
pump mount pad.
Provides
up to 475
foot pounds
intermittant,
400
continuous
of torque to
power your
vessel’s
hydraulic
system.
ESP and DC Electrical System
• 24 volt, standard
ground electrical
system with 24-volt
/ 75-amp alternator
(1) and starter.
• Eight groove poly-
vee drive belt (3)
with self tensioner
(2) powers the
alternator.
• 4 groove pulley (4) is optional.
• The Engine Control Unit (ECU) is housed
in a water resistant module. It controls the
electronic fuel injection
system. The ECU
supplies a SAE
J1939 engine
information
data stream
that is accessible
through a CANbus
plug for the Electronic
System Profilier
(ESP) monitor screen.
Service diagnostics
and error codes are
automatically stored.
• Instrument panel has
tachometer, DC volt meter,
hour meter, coolant temperature and oil
pressure gauges, light rheostat, stop
button and key switch. Warning lights
and audible alarm for low oil pressure
and high water temperature.
• Engine and panel are prewired. 20-foot
wire harness with plug-ins is standard.
Special Equipment
• Alternator belt guard protects operator.
• Sparkling white IMRON®polyurethane
paint protection. Excellent service
visibility.
• Operator’s and parts manuals.
• Auxiliary Drives:
Gear driven, SAE
A, 9 tooth spline
auxiliary drive (1)
provides up to 75 foot
lbs of torque to run
hydraulic pumps. On
keel cooled engines
only, an additional gear driven, SAE B, 13
tooth spline, auxiliary drive (2) provides
up to 131 foot lbs of torque. Note: if both
drives are used the maximum combined
total torque available is 131 ft lbs.
1 2 3 4
• Heat exchanger
cooling includes:
(1) Gear driven,
flexible impeller
seawater pump;
no belts to replace.
(2) Easy to clean,
tube-type heat
exchanger is
cupro-nickel
for long life.
(3) Cast
expansion
tank. No
welds to
break. Brass
filler neck.
(4) Bronze
and stainless
steel seawater piping.
• Cupro-nickel transmission oil cooler (5)
uses thermostatically controlled engine
coolant for constant gear temperature to
prevent condensation.
• Zinc anodes for electrolysis protection.
Lubrication System
• (1) Spin-on oil filter has a full flow and a
bypass element to trap both small and large
contaminates and water.
• (2) Plate-type, full flow
oil cooler uses engine
coolant to reduce oil
temperature and
thermal breakdown.
• 500 hour oil change
when using specified
oil and fuel.
• Multiple oil fill and
dip stick locations
provide either side service access.
• Positive displacement gear-type oil pump.
• Oil spray cooling reduces piston crown
temperature for longer life.
• Large capacity oil pan.
Air System
• US EPA Tier II and IMO exhaust emissions
compliant.
• Turbocharged and aftercooled for increased
power and performance.
• Turbocharger turbine housing (1) is jacket
water
cooled for safety.
• Dry air filter (2)
protects engine
and silences
intake noise.
• Air-Sep®closed
crankcase vent
(3) returns oil
vapor to engine
oil pan for a
clean engine
room.
• Two pass, jacket water cooled, charge
air aftercooler. Using thermostatically
controlled jacket-water instead of seawater
normalizes combustion air temperatures
to avoid over cooling under light load
conditions.
L1276A2 Accessories and Options
1
3
2
54
2
1
3
2
1
1
2

Performance Data and Specifications
L1276A2
Notes: 1. Max. cruise rpm for High Output and Medium Duty ratings is1900 or 200 rpm below highest attainable rpm-
whichever is lower.
Curves: A. Maximum torque at flywheel. B. Flywheel power. Prop shaft power is 3-3.5% lower due to marine reduction
gear power loss. C. Theoretical prop power draw (3.0 exponent).
D. Fuel consumption based on theoretical propellar HP draw.Your fuel consumption will vary higher or lower depending
on your vessel and operating conditions.
Output rating CONTINUOUS MEDIUM HIGH OUTPUT
FWHP (kW) 340 (252) 425 (315) 525 (389)
Maximum RPM 1800 2100 2100
Cylinders / Configuration / Cycle 6 / Inline / 4 6 / Inline / 4 6 / Inline / 4
Displacement CID (ltr) 763 (12.5) 766 (12.5) 766 (12.5)
Aspiration All Models: Turbocharged Aftercooled
Bore x Stroke in (mm) All Models: 5 x 6.5 (127 x 165)
Cooling (General)
Coolant circ pump flow - US gal (ltr) 73 (232) 85 (277) 85 (277)
Heat rejection to jacket water - BTU-min 6,690 8,363 10,331
Cooling (Heat Exchanger)
HE engine coolant capacity - US gal (ltr) 14.25 (54) 14.25 (54) 14.25 (54)
Rawwater intake/discharge dia. - in (mm) 3 (75) 3 (75) 3 (75)
Rawwater pump flow - gpm (lpm)/rpm 92 (348) 99 (374) 99 (374)
Rawwater pump max. suction head - in (m) 39 (1) 39 (1) 39 (1)
Max. raw water temp. at inlet -°F (°C) 86° (30°) 86° (30°) 86° (30°)
Cooling (Keel Cooled)
Based on 70° F seawater and minimum full boat speed of 8 knots.
Return water from keelcooler 70°-130° F. 70°-130° F. 70°-130° F.
KC engine coolant capacity - US gal (ltr) 11.75 (44) 11.75 (44) 11.75 (44)
Water hose inside diameter - in (mm) 3 (75) 3 (75) 3 (75)
Head diameter - in All Models: 2” NPT or 3” hose barb
Turbo tube length - ft (m) 48 (14.6) 64 (19.5) 80 (24.4)
1 in. plain round tube length - ft (m) 112 (34.1) 140 (42.7) 174 (53)
Skin cooler aluminum - sq ft (m2) 51 (4.7) 64 (5.9) 80 (7.4)
Skin cooler steel - sq ft (m2) 170 (15.8) 212 (19.7) 263 (24.4)
Electrical
Voltage All Models: 24V standard (12V optional)
Min. battery capacity - 24 volt All Models: 2 x 225 amp hours - 1150 CCA
Battery cable size up to 10 ft run “00” “00” “00”
Standard panel harness length - ft (m) All Models: 20 ft (6m) std, 40 & 60 ft optional
Air and Exhaust
Engine air consumption - cfm (m3/min) 816 (23.1) 1029 (29.1) 1264 (35.8)
Min. engine room vent area - sq in (m2) 240 (0.16) 301 (0.19) 370 (0.24)
Exhaust gas flow at - cfm (m3/min) 1819 (52) 2243 (63.5) 2815 (79.7)
Exhaust gas temperature -°F (°C) 738 (392) 725 (385) 736 (391)
Max. exhaust back pressure - in (mm) H
2
0 30 (762) 30 (762) 30 (762)
Suggested dry exhaust I.D. - in (mm) 5(125) 6(150) 6(150)
Suggested wet exhaust I.D. - in (mm) 8(203) 8(203) 8(203)
Fuel and Oil
Minimum fuel suction line - in (mm) 0.5 (12) 0.5 (12) 0.5 (12)
Minimum fuel return line - in (mm) 0.375 (10) 0.375 (10) 0.375 (10)
Maximum fuel pump head - in (m) 39 (1) 39 (1) 39 (1)
Crankcase oil capacity - US qts (ltr) 44 (42) 44 (42) 44 (42)
Other Data
Engine rotation (facing flywheel) All Models: Counter-Clockwise
Flywheel housing size All Models: Std. SAE 1, 14” Std. (SAE 2, 11.5” opt)
Optional front PTO size All Models: SAE 4, 10” or SAE 3, 11.5”
Max operating down angle - front/rear 0°/12° 0°/12° 0°/12°
Approximate Weight*
Dry weight with HE, no gear - lbs (kg) 3210 (1456) 3210 (1456) 3210 (1456)
Dry weight, KC, no gear - lbs (kg) 3093 (1403) 3093 (1403) 3093 (1403)
L1276A2 Specifications and Installation Data L1276A2 Performance Data
Dealer 4420 14th Ave. NW., Seattle WA 98107
Tel: [phone] • 1-800-762-0165 • Fax: [phone]
Information and dimensions subject to change without notice.
Northern Lights and Lugger are registered trademarks
of Northern Lights, Inc.
© 2005 All rights reserved. Litho USA. L654 3/08 www.northern-lights.com
Dimensions inch (mm)
A length 69.94 (1776)
B width 46.02 (1169)
C height 41.31 (1049)
D mounts 34.55 (878)
E mounts 26.0 (660)
*Do NOT use for installation. Contact factory for current installation drawings.
High Output Rating1FWHP / kW / @ rpm 525 / 389 / 2100
Medium Duty Rating1FWHP / kW / @ rpm 425 / 315 / 2100
Continuous Duty Rating FWHP / kW / @ rpm 340 / 252 / 1800
HIGH OUTPUT1
A B C D
ft/lbs fwhp pdhp gph
1291 246 55 2.8
1609 368 95 4.6
1775 473 151 7.3
1775 541 224 11.4
1628 558 318 16.1
1435 546 438 22.0
1315 525 507 25.5
CONTINUOUS
A B C D
ft/lbs fwhp pdhp gph
-- -- -- --
1120 256 97.5 4.9
1114 297 154 7.5
1116 340 231 11.4
992 340 328 16.3
-- -- -- --
-- -- -- --
MEDIUM DUTY1
A B C D
ft/lbs fwhp pdhp gph
1439 274 44.4 2.2
1440 329 76 3.8
1441 384 122 6.1
1517 432 181 9.2
1351 463 259 12.6
1211 461 354 17.3
1062 425 410 23.4
RATING
Curve
RPM
1000
1200
1400
1600
1800
2000
2100