Please read thoroughly before attempting to use this manual:
Table of Contents .................................................................................................................................................... I
Model Designation & Serial Numbers ................................................................................................................... II
Reading a Parts Page ............................................................................................................................................. III
This manual covers the operating instructions for
M984K, ML984, L984, M33C, M984W, and M33CW which use the 984 engine.
Model Numbers
Model numbers give the unit's application, block model, aspiration, and RPM:
M - L 984 L, C W
M - Northern Lights marine
generator set
L - Lugger propulsion engine
M984K
ML984
Northern Lights marine diesel generator set
=
with a 984 engine and a PX-332K generator.
Northern Lights marine diesel generator
=
set with a 984 engine and a PSL
generator.
Lugger propulsion engine with a 984 engine.L984
=
Model number of engine block
BoreCylinders
98 mm4
M33CW
Additional letters
designate a series within
a model number.
Northern Lights 33 kW commercial grade
M33C
M984W
=
marine diesel generator set.
Northern Lights marine diesel generator set with
=
a 984 engine and a PX-332K2 generator.
Northern Lights marine diesel generator set with
=
a 984 engine and a PX-332K2 generator.
Designates a new
winding in the
generator.
Serial Numbers
NORTHERN LIGHTS
Northern Lights generator sets with PSL generators have two data plates and two serial numbers. One serial
number is for the generator end, and it is found on the Generator End Data Plate.
found with the Generator Set Data Plate, should be used when ordering parts for sets using PSL
generators. Units with PXK generators have just one plate. Serial numbers for Northern Lights units are
eight digits in length (e.g. 1234-5678).
LUGGER
When ordering Lugger parts, please refer to the serial number located on the flywheel housing.
The other serial number,
Generator Set Serial Number
for units with PX K and PSL
generators
Generator End Serial Number
for units with PSL generators
Lugger Serial Number
P984 09/05
II
Reading a Parts Page
IMPORTANT:
Before selecting parts, be sure that you are choosing parts from the correct page.
Check the model designation at the page top.
Do not use this illustration for parts purchasing.
2013201-78300-714Connecting Rod Assemblyup to S/N - 0042812
20A90384-32951-714Wrist Pin Bushing20B13265-680108Connecting Rod Bolt20C90179-120158Nut-
2113101-78700-714Piston Assembly, Standard
13103-78700-714Piston Assembly, 0.50 mm O/S
13105-78700-714Piston Assembly, 1.00 mm O/S
21A90521-340048Snap Ring-
3013204-78300-711Connecting Rod Bearing Set, 0.25 mm, Undersize-
13205-78300-711Connecting Rod Bearing Set, 0.50 mm, Undersize13206-78300-711Connecting Rod Bearing Set, 0.75 mm, Undersize13207-78300-711Connecting Rod Bearing Set, 1.00 mm, Undersize-
30A13041-68040-014Connecting Rod Bearing, Mark 1 - Standard-
13041-68040-024Connecting Rod Bearing, Mark 2 - Standard-
Note: Standard size connecting rod bearings must be
Note: matched to rods stamped with Mark 1 or Mark 2.
3111704-78700-711Main Bearing Set, 0.25 mm, Undersize-
11705-78700-711Main Bearing Set, 0.50 mm, Undersize11706-78700-711Main Bearing Set, 0.75 mm, Undersize11707-78700-711Main Bearing Set, 1.00 mm, Undersize-
Note: Standard size main bearings must be matched to cylinder blocks
Note: with bearing caps stamped with Mark 1, Mark 2 or Mark 3.
3213011-78700-711Piston Ring Set, Standard-
13013-78700-711Piston Ring Set, 0.50 mm, Oversize13015-78700-711Piston Ring Set, 1.00 mm, Oversize-
3411011-78300-711Thrust Washer Set, Standard Only-
11012-78300-711Thrust Washer Set O/S, 0.125 mm-
11013-78300-711Thrust Washer Set O/S, 0.25 mm4013411-78700-711Crankshaft4113471-78701-711Crankshaft Pulley - Standard-
34-654011Crankshaft Pulley - Optional-
41A95161-105191Key-
4213521-78700-711Crankshaft Timing Gear-
42A95161-105191Key-
4334-654021Mounting Flange4415-007014Flat Washer M84512-007124Capscrew, Hex Head M8 x 1.25 x 25 mm-
AC90105-16950-711Retaining Bolt - Standard Pulley-
90105-16951-711Retaining Bolt - Optional Pulley-
(includes Key #21A)-
(includes Key #21A)-
(includes Key #21A)-
P984 09/05
1 - 3
GROUP 1 – ENGINE
Crankshaft, Pistons & Connecting Rods
P984 09/05
1 - 4
A-5201 / B-3989 + 1301
GROUP 1 – ENGINE
Crankshaft, Pistons & Connecting Rods
KEYPART NUMBERQTYDESCRIPTIONENGINE BLOCK S/N
2013201-78300-714Connecting Rod Assemblyfrom S/N 0042813 20A90384-32951-714Wrist Pin Bushing20B13265-680108Connecting Rod Bolt-
20C90179-120158Nut-
2113101-78702-714Piston Assembly, Standard
13103-78701-714Piston Assembly, 0.50 mm O/S
13105-78701-714Piston Assembly, 1.00 mm O/S
21A90521-340048Snap Ring-
3013204-78300-711Connecting Rod Bearing Set, 0.25 mm, Undersize-
13205-78300-711Connecting Rod Bearing Set, 0.50 mm, Undersize13206-78300-711Connecting Rod Bearing Set, 0.75 mm, Undersize13207-78300-711Connecting Rod Bearing Set, 1.00 mm, Undersize-
30A13041-68040-014Connecting Rod Bearing, Mark 1 - Standard-
13041-68040-024Connecting Rod Bearing, Mark 2 - Standard-
Note: Standard size connecting rod bearings must be
Note: matched to rods stamped with Mark 1 or Mark 2.
3111704-78700-711Main Bearing Set, 0.25 mm, Undersize-
11705-78700-711Main Bearing Set, 0.50 mm, Undersize11706-78700-711Main Bearing Set, 0.75 mm, Undersize11707-78700-711Main Bearing Set, 1.00 mm, Undersize-
Note: Standard size main bearings must be matched to cylinder blocks
Note: with bearing caps stamped with Mark 1 through Mark 6.
3213011-78701-711Piston Ring Set, Standard-
13013-78701-711Piston Ring Set, 0.50 mm, Oversize13015-78701-711Piston Ring Set, 1.00 mm, Oversize-
3411011-78300-711Thrust Washer Set, Standard Only-
11012-78300-711Thrust Washer Set O/S, 0.125 mm-
11013-78300-711Thrust Washer Set O/S, 0.25 mm4013411-78701-711Crankshaft4113471-78701-711Crankshaft Pulley - Standard-
34-654011Crankshaft Pulley - Optional-
41A95161-105191Key-
4213521-78701-711Crankshaft Timing Gear-
42A95161-105191Key-
4334-654021Mounting Flange4415-007014Flat Washer M84512-007124Capscrew, Hex Head M8 x 1.25 x 25 mmAC90105-16950-711Retaining Bolt - Standard Pulley-
90105-16951-711Retaining Bolt - Optional Pulley-
(includes key #21A)-
(includes key #21A)-
(includes key #21A)-
P984 09/05
1 - 5
GROUP 1 – ENGINE
Flywheel and Housing
01-01: 3101
KEYPART NUMBERQTYDESCRIPTIONSERIAL NUMBER
111351-78302-711Flywheel Housing - SAE #4213405-78302-711Flywheel Assembly - SAE #10313453-22060-711Ring Gear - 108 Teeth490105-120396Washer Based Head Hexagon Bolt590116-12950-712Stud-
1190430-371401Gasket1291631-408404Capscrew, Hex Head w/Washer M8 x 1.25 x 40 mm1390210-080074Sealing Washer1490910-0207018Head Bolt M12 x 1.25 x 117 mm1590345-540051Plug1611213-78300-711Rocker Arm Cover Gasket1711115-78701-711Cylinder Head Gasket
911201-78700-711Rocker Arm Cover1012180-130301Oil Filter Cap
1190430-371401Gasket1291621-608654Capscrew, Hex Head w/Washer M8 x 1.25 x 65 mm1390210-080074Sealing Washer1490910-0207018Head Bolt M12 x 1.25 x 117 mm1590345-540051Plug1611213-78700-711Rocker Arm Cover Gasket1711115-78701-711Cylinder Head Gasket1800-054041Label-
(includes keys #2 - #8)from S/N 0042813 -
(includes key #11)-
P984 09/05
1 - 15
GROUP 1 – ENGINE
Oil Drain Kit
Northern Lights Application
A-4348 / B-3669
KEYPART NUMBERQTYDESCRIPTIONSERIAL NUMBER
136-754021Oil Pan Drain Fitting221-625081Male Elbow 90° 3/8 NPT x 1/2-37T-
318-754001Hose Assembly 1/2" ID x 1/2 NPT x 1/2-37T421-000031Pipe Cap, 1/2 NPT519-000101Hose Clamp623-754151Oil Drain Hose Support Bracket790430-250131Gasket-
P984 09/05
1 - 16
GROUP 1 – ENGINE
Notes
P984 09/05
1 - 17
GROUP 2 – INTAKE & EXHAUST SYSTEM
Air Intake & Vent Hose
Early Production Generator Sets and L984D
A-7044, A-7378, A-7869 / C-2334A
KEYPART NUMBERQTYDESCRIPTIONSERIAL NUMBER
110-254011Air Intake Manifold
10-254021Air Intake Manifold
(Marine)-
(Lugger)-
211-254001Gasket300-754021Rear Lifting Eye424-254011Air Filter Element
24-254021Air Filter Element
(Lugger)-
(Marine - see Intake Noise Reduction Assembly)
512-008092Capscrew, Hex Head M10 x 1.25 x 25 mm615-008022Helical Lock Washer M10721-254011Male Connection 3/8 NPT x 5/8 HB812-007542Capscrew, Hex Head M8 x 1.25 x 85 mm-
915-007014Flat Washer, M81016-254004O-Ring1112-007132Capscrew, Hex Head M8 x 1.25 x 35 mm1212261-78301-711Vent Hose1390467-230022Hose Clamp-
P984 09/05
2 - 0
GROUP 2 – INTAKE & EXHAUST SYSTEM
Intake Noise Reduction
Marine Application - Early Production
P984 02-01: B-4821
KEYPART NUMBERQTYDESCRIPTIONSERIAL NUMBER
110-254011Intake Manifold228-254011Cover Plate324-254021Air Filter Element411-254011Gasket718-254031Hose, Air Intake 2" ID x 65" (1500 RPM units)-
18-254021Hose, Air Intake 2" ID x 54" (1800 RPM units)819-000321Hose Clamp #32924-254031Screen-
P984 09/05
2 - 1
GROUP 2 – INTAKE & EXHAUST SYSTEM
Air Intake & Vent Hose
Marine Application - Late Production
A-7708 / C-4057
KEYPART NUMBERQTYDESCRIPTIONSERIAL NUMBER
110-254021Air Intake Manifold211-254001Gasket300-754821Lifting Eye, Rear424-254021Air Filter Element512-008092Capscrew, Hex Head M10 x 1.25 x 25 mm615-008022Lock Washer, Helical M10721-254011Nipple, Plain, BP, 3/8 NPT x 1-1/4812-007542Capscrew, Hex Head M8 x 1.25 x 85 mm-
915-007014Flat Washer M81016-254004O-Ring, 8.5 mm x 18 mm x 3.2 mm1112-007132Capscrew, Hex Head M8 x 1.25 x 35 mm1212261-78301-711S-Hose1390467-230022Hose Clamp1424-254051Screen1511-254021Gasket1628-254021Plate1712-002093Capscrew, Hex Head 5/16-18 x 3/4"1815-002033Star Washer, Internal 5/16"1900-25401**Rubber Cushion Strip 7/8" LOA-
00-25402**Cushioned Steel U-Channel-
** As required.
P984 09/05
2 - 2
GROUP 2 – INTAKE & EXHAUST SYSTEM
Intake Noise Reduction
Marine Application - Late Production
A-8483, A-8498 / C-4063
KEYPART NUMBERQTYDESCRIPTIONSERIAL NUMBER
118-254021Air Intake Hose, 2" ID x 54" (1800 RPM units)-
18-254031Air Intake Hose, 2" ID x 65" (1500 RPM units)219-000321Hose Clamp #32319-710352Adelle Clamp 2-14" ID x 1/2" Stud412-095161Capscrew, Hex Head 1/2-13 x 2" Stainless Steel515-005082Flat Washer 1/2 SAE Stainless Steel621-210041Spacer, BP. 1/2 SCHD 40 x 13/16"712-007761Capscrew, Hex Head M8 x 1.25 x 20 mm Stainless Steel815-007051Lock Washer, Helical M8 Stainless Steel915-007061Flat Washer M8 Stainless Steel-
P984 09/05
2 - 3
GROUP 2 – INTAKE & EXHAUST SYSTEM
Intake Manifold
P984 02-04: 1701
KEYPART NUMBERQTYDESCRIPTIONENGINE BLOCK S/N
117111-78300-711Intake Manifoldup to S/N -0042812
217171-78300-711Intake Manifold Gasket
390179-080613Lock Nut, Flanged M8 x 1.25
490116-081313Stud M8 x 1.25 x 20 mm (30 mm LOA)
591611-608253Capscrew, Hex Head with Washer M8 x 1.25 x 25 mm
691611-608653Capscrew, Hex Head with Washer M8 x 1.25 x 65 mm
117111-78700-711Intake Manifoldfrom S/N 0042813 217171-78700-711Intake Manifold Gasket
390179-080613Lock Nut, Flanged M8 x 1.25
490116-081313Stud M8 x 1.25 x 20 mm (30 mm LOA)
591611-608256Capscrew, Hex Head with Washer M8 x 1.25 x 25 mm
P984 09/05
2 - 4
GROUP 2 – INTAKE & EXHAUST SYSTEM
Air Inlet
Commercial Application
A-5546/ C-2716
KEYPART NUMBERQTYDESCRIPTIONSERIAL NUMBER
124-200011Air Filter231-254011Air Inlet Adapter311-254001Gasket412-007124Capscrew, Hex Head M8 x 1.25 x 25 mm515-007024Lock Washer M8618-710101Hose, 5/8" ID x 11"719-000082Hose Clamp #8819-000401Hose Clamp #40-