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Northern Lights L773L Engine

The Northern Lights L773L is a 1.13 L 3-cylinder naturally aspirated engine rated at 1800 rpm. It powers generator sets from Northern Lights, including the NL773LW4. It holds 5 L (1.3 gal) of oil.

Also known as: Northern Lights L773L

Part of the Northern Lights 773 engine family — 5 variants share parts & fitment.

1.13 L

Displacement

Cylinders

1800 rpm

Rated speed

5.0 L

Oil capacity

On this pageSpecs Generator sets Maintenance FAQ Fluids

Engine specifications

Oil capacity	5.0 L
Displacement	1.13 L
Cylinders	3
Aspiration	Naturally aspirated
Rated speed	1800 rpm

Generator sets powered by this engine

Northern Lights NL773LW4

How to read your Northern Lights engine serial & model number →

Maintenance schedule

Item	Spec	Capacity	Part #
Air filter	Large, replaceable air filter protects engine in dusty environments.		24-27301	Amazon eBay $44.91
Fuel filter	Large spin-on fuel ﬁlter. Flexible fuel lines routed to fuel manifold for easy tank connectivity.		24-52020	Amazon eBay $24.71 NAPA $15.34
Oil filter	Full flow, spin-on oil filter with bypass.		24-02001	Amazon eBay $23.45 NAPA $9.09
Battery			—
Belt			40-08605	eBay
Coolant			—
Oil	5 qt. (4.9 ltr) oil capacity for better lubrication.	5.0 qt	—
Spark plug			—

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Recommended fluids

Fluid	Grade	Standard	Ambient	Capacity	Notes
Fuel	ULTRA LOW SULFUR FUEL ONLY				Label required near fuel tank fill port per U.S. EPA regulations.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Parts cataloged across the Northern Lights 773 family

300

Part #	Description	Category
24-28602	Air Filter Element	Air filter
RE529956	Breathing	Air filter
185046210	Alternator Assembly	Alternator
185046220	Alternator 12 Volt, 40 Amp	Alternator
185446234	Regulator Assembly	Avr
00-08601	Belt Guard	Belt
40-08601	Drive Belt	Belt
185416490	Brush Assembly	Brush
185416500	Brush Holder Assembly	Brush
185426231	Brush	Brush
130306190	Fuel Filter Assembly	Fuel filter
24-52020	Fuel Filter	Fuel filter
052109099	Gasket	Gasket
052109101	Gasket	Gasket
11-08601	Gasket, Exhaust	Gasket
11-12005	Oil Fill Neck Gasket	Gasket
11-18602	Gasket, Thermostat Cover	Gasket
11-31902	Gasket	Gasket
110996800	Gasket	Gasket
111147560	Head Gasket; t = 1.2	Gasket
111147570	Head Gasket; t = 1.3	Gasket
111996420	Gasket, Rocker Arm Cover	Gasket
120996150	Gasket, Rocker Arm Bracket	Gasket
130326051	Gasket	Gasket
130516069	Gasket	Gasket
130516089	Gasket	Gasket
130996130	Gasket	Gasket
131426200	Gasket	Gasket
131426210	Gasket	Gasket
135996750	Gasket, Air Intake	Gasket
135996930	Gasket	Gasket
135996940	Gasket	Gasket
140546020	Filter Joint	Gasket
140996260	Gasket	Gasket
140996270	Gasket, Valve Assembly	Gasket
145996830	Gasket	Gasket
16-08601	O-ring	Gasket
165996520	Gasket, Front Plate	Gasket
165996530	Gasket	Gasket
198996060	Gasket	Gasket
29-08600	Gasket Kit	Gasket
29-08601	Gasket Kit (includes all keys)	Gasket
314990030	Gasket, Elbow	Gasket
340990011	Gasket, Gear Case Cover	Gasket
185366220	Glow Plug, 12 Volt	Glow plug
185376370	Connector, Glow Plugs (former Harness part # 184606360)	Glow plug
068115200	Tube	Hose
10-28603	Cover, Lower Air Intake with 1-3/8" Hose Barb	Hose
140986830	Oil Hose (Marine)	Hose
18-18601	Coolant Pump Inlet Hose	Hose
18-18602	Hose 5/16" ID x 28" Polyvinyl	Hose
18-18603	Hose, Coolant By-pass	Hose
18-18604	Hose, Coolant Pump Inlet	Hose
18-18605	Hose, Expansion Tank Outlet	Hose
18-28201	Hose 1-5/8" ID x 1-3/4" 3 Ply Silicone	Hose
18-28601	Hose, Air Intake	Hose
18-72004	Oil Drain Hose	Hose
19-00012	Hose Clamp #12	Hose
19-00016	Hose Clamp #16	Hose
19-00020	Hose Clamp #20	Hose
19-00040	Hose Clamp #40	Hose
19-00048	Hose Clamp #48	Hose
19-18602	Hose Clamp	Hose
21-13102	Union 3/4" Hose Barb	Hose
27-18601	Tube 5/16" ID x 23" Polyurethane	Hose
41-00004	Hose 3/4" ID x 18-1/2"	Hose
41-01011	Hose 1/4" ID Push-on	Hose
49-00012	Hose Clamp #12	Hose
25-11216	Impeller	Impeller
25-12009	Impeller (includes key #15)	Impeller
25-12060	Impeller	Impeller
131406340	Injector Assembly	Injector
131406470	Injector	Injector
131416150	Nozzle	Injector
24-02001	Oil Filter	Oil filter
24-02002	Oil Filter	Oil filter
00-00013	Label "12 Volt"	Service part / kit
00-00014	Label "24 Volt"	Service part / kit
00-08301	"Northern Lights" Decal	Service part / kit
00-13101	Spring	Service part / kit
00-40013	Plate, S-1 Control Panel	Service part / kit
00-40028	Grommet	Service part / kit
010109235	Bolt	Service part / kit
010109238	Plug	Service part / kit
010109264	Bolt	Service part / kit
010109340	Bolt	Service part / kit
010110610	Bolt	Service part / kit
010110625	Bolt	Service part / kit
010110630	Bolt	Service part / kit
010310860	Bolt	Service part / kit
010311020	Bolt	Service part / kit
010311045	Bolt	Service part / kit
010700610	Bolt	Service part / kit
010700820	Bolt	Service part / kit
010700835	Bolt	Service part / kit
010810840	Bolt	Service part / kit
010810845	Bolt	Service part / kit
011100408	Bolt	Service part / kit
011301025	Bolt	Service part / kit
011310612	Bolt	Service part / kit
011310614	Bolt	Service part / kit
011310620	Bolt	Service part / kit
011310625	Bolt	Service part / kit
011310635	Bolt	Service part / kit
011310640	Bolt	Service part / kit
011310660	Bolt	Service part / kit
011310680	Bolt	Service part / kit
011510640	Bolt	Service part / kit
011510840	Bolt	Service part / kit
011510865	Bolt	Service part / kit
012100620	Stud	Service part / kit
012100635	Stud M6 x 1.0 x 35 mm	Service part / kit
012100820	Stud	Service part / kit
012109177	Stud	Service part / kit
012110620	Stud M6 x 1.0 x 20 mm	Service part / kit
012110635	Stud	Service part / kit
012110660	Stud	Service part / kit
015100412	Screw	Service part / kit
015140408	Screw	Service part / kit
015140425	Screw	Service part / kit
020109075	CON ROD NUT	Service part / kit
020109076	Nut	Service part / kit
020210010	Nut	Service part / kit
020700008	Nut	Service part / kit
020800018	Nut	Service part / kit
020900010	Nut	Service part / kit
023100004	Nut	Service part / kit
023100006	Nut	Service part / kit
023100008	Nut	Service part / kit
024600008	Cap Nut	Service part / kit
026100010	Washer	Service part / kit
026200008	Washer	Service part / kit
026200010	Washer	Service part / kit
027100008	Spring Washer	Service part / kit
027100010	Spring washer	Service part / kit
030300414	Spring Pin	Service part / kit
030300816	Spring Pin	Service part / kit
030309005	Spring Pin	Service part / kit
030500512	Dowel Pin	Service part / kit
030500612	Dowel Pin	Service part / kit
030500616	Dowel Pin	Service part / kit
030501025	Dowel Pin	Service part / kit
030509020	Dowel Pin	Service part / kit
031100004	Snap Pin	Service part / kit
034100508	Key	Service part / kit
036500021	Snap Ring	Service part / kit
036509005	Snap Ring	Service part / kit
036800005	Snap Ring	Service part / kit
036800006	Snap Ring	Service part / kit
036800008	Snap Ring	Service part / kit
036800010	Snap Ring	Service part / kit
040106203	Bearing	Service part / kit
040109059	Bearing	Service part / kit
040126210	Bearing	Service part / kit
040306203	Bearing	Service part / kit
042303015	Bearing	Service part / kit
048100010	Steel Ball	Service part / kit
064100045	Expansion Plug	Service part / kit
064210015	Expansion Plug, 15 mm	Service part / kit
064210018	Expansion Plug, 18 mm	Service part / kit
064210025	Expansion Plug, 25 mm	Service part / kit
064210030	Expansion Plug, 30 mm	Service part / kit
064210035	Expansion Plug, 35 mm	Service part / kit
064210040	Expansion Plug, 40 mm	Service part / kit
064510020	Plug	Service part / kit
10-08601	Exhaust Manifold/ Expansion Tank	Service part / kit
10-28601	Air intake Manifold	Service part / kit
10-28602	Cover	Service part / kit
10-51099	Fuel Manifold 1/4 NPT	Service part / kit
110101520	Cylinder Block Assembly - (includes keys #2- 21)	Service part / kit
110103541	Cylinder Block Assembly (includes keys #2 - #21, formerly #110103540)	Service part / kit
110136280	Valve Seat	Service part / kit
110136300	Valve Seat	Service part / kit
110156400	Bearing Holder Assembly (includes keys #6 & #7)	Service part / kit
110156410	Bearing Holder Assembly (includes keys #6 & #7)	Service part / kit
110156420	Bearing Holder Assembly (includes keys #6 & #7)	Service part / kit
110446421	Flywheel Housing	Service part / kit
110566080	Breather Valve	Service part / kit
110666050	Retainer	Service part / kit
110666060	Vent Filter	Service part / kit
110701110	Oil Pan	Service part / kit
110708620	Oil Pan	Service part / kit
110756490	Dipstick Tube	Service part / kit
110766200	Holder	Service part / kit
111010290	Cylinder Head Assembly (Includes keys #1 - #14)	Service part / kit
111136440	Head Bolt	Service part / kit
111136450	Head Bolt	Service part / kit
111217470	Rocker Arm Cover Assembly (includes keys #3 - #5)	Service part / kit
115017450	Piston Kit; O.S. 0.50	Service part / kit
115017460	Piston Kit; S.T.D.	Service part / kit
115026340	Connecting Rod Assembly (includes keys #20 - #22)	Service part / kit
115107430	Ring Kit; O.S. 0.50 mm	Service part / kit
115107900	Ring Kit; S.T.D.	Service part / kit
115176150	Connecting Rod Bolt	Service part / kit
115256830	Crankshaft Assembly (includes keys #2 - 4 & #24)	Service part / kit
115276180	Crankshaft Gear	Service part / kit
115326231	Piston Pin	Service part / kit
115326234	Piston Pin	Service part / kit
115356720	Flywheel Assembly (includes key #28)	Service part / kit
115376130	Ring Gear	Service part / kit
115396650	Crankshaft Pulley	Service part / kit
12-00030	Capscrew, Hex Head, M6 x 1.0 x 16 mm	Service part / kit
12-00031	Capscrew, Hex Head M6 x 1.0 x 25 mm	Service part / kit
12-00093	Machine Screw, Round Head Philips #6 - 32 x 1/2"	Service part / kit
12-00094	Machine Screw #10-32 x 3/8" Stainless Steel	Service part / kit
12-00311	Capscrew, Hex Head 3/8-16 x 3/4"	Service part / kit
12-00313	Capscrew, Hex Head 3/8-16 x 1-1/4"	Service part / kit
12-00753	Capscrew, Hex Head M8 x 1.25 x 30 mm	Service part / kit
12-00776	M8 x 20 18-8, S/S hex head capscrew	Service part / kit
12-00943	Capscrew, Hex Head M12 x 1.25 x 30 mm	Service part / kit
12-01102	Capscrew, Hex Head M6 x 1.0 x 16 mm S/S	Service part / kit
12-01124	Capscrew, Hex Head M6 x 1.0 x 50 mm	Service part / kit
12-01125	Capscrew, Hex Head M6 x 1.0 x 65 mm	Service part / kit
12-01131	Capscrew, Hex Head M6 x 1.0 x 20 mm	Service part / kit
12-01132	Capscrew, Hex Head M6 x 1.0 x 85 mm	Service part / kit
12-09130	Capscrew, Hex Head M6 x 1.0 x 95 mm S/S	Service part / kit
12-09136	Capscrew, Hex Head M6 x 1.0 x 90 mm S/S	Service part / kit
12-09712	Capscrew, Hex Head M8 x 1.25 x 25 mm S/S	Service part / kit
12-09814	Capscrew, Hex Head M10 x 1.5 x 35 mm S/S	Service part / kit
12-09956	Capscrew, Hex Head M12 x 1.75 x 65 mm, S/S	Service part / kit
12-90049	Capscrew, Hex Head M6 x 1.0 x 15 mm	Service part / kit
120016021	Cam Gear Assembly	Service part / kit
120026570	Cam Shaft Assembly	Service part / kit
1200311	Capscrew, Hex Head 3/8-16 x 3/4"	Service part / kit
120036880	Rocker Arm Assembly (includes keys #1-10)	Service part / kit
120116160	Tappet	Service part / kit
120166360	Intake Valve	Service part / kit
120176250	Exhaust Valve	Service part / kit
120186080	Retainer	Service part / kit
120216040	VALVE SPRING CAP (A)	Service part / kit
120226070	Cotter	Service part / kit
120316300	Rocker Arm Shaft	Service part / kit
120356200	Intake Rocker Arm	Service part / kit
120356210	Exhaust Rocker Arm	Service part / kit
120456222	Push Rod	Service part / kit
120736081	Gear	Service part / kit
125046260	Governor Lever Assembly	Service part / kit
125116131	Shaft	Service part / kit
125156170	Arm	Service part / kit
125156180	Arm	Service part / kit
125176180	Stop Lever (formerly #125176080)	Service part / kit
125256120	Slider	Service part / kit
125406071	Tension Lever	Service part / kit
125416020	Governor Lever	Service part / kit
125976120	Bracket	Service part / kit
13-09710	Stud M8 x 1.25 x 25 mm (35 mm LOA S/S)	Service part / kit
13-80070	Stud, M10 x 1.5 x 110.8 mm	Service part / kit
13-91132	Stud, M6 x 1.0 x 111.4 mm	Service part / kit
130396030	Plug	Service part / kit
130436011	Banjo Bolt	Service part / kit
130516080	Housing	Service part / kit
130516081	Spring	Service part / kit
130516082	Piston	Service part / kit
130516083	Spring	Service part / kit
130516084	Diaphragm	Service part / kit
130516085	Pin	Service part / kit
130516086	Lever	Service part / kit
130516087	Spring	Service part / kit
130516090	Cap	Service part / kit
130516091	Screw	Service part / kit
130516092	Joint Bolt	Service part / kit
130556681	Pipe	Service part / kit
130556920	Pipe	Service part / kit
130556931	Pipe	Service part / kit
131236190	Bolt	Service part / kit
131236280	Screw	Service part / kit
131426300	Shim Set	Service part / kit
131446066	Spring	Service part / kit
131446068	Spacer	Service part / kit
131446069	Nut	Service part / kit
131446070	Spring seat	Service part / kit
131507740	Injection Line #1	Service part / kit
131507750	Injection Line #2	Service part / kit
131507760	Injection Line #3	Service part / kit
131606880	Return Line	Service part / kit
131976270	Bracket, Filter Support & Lifting Eye (can use 23-08601)	Service part / kit
135597640	Spacer	Service part / kit
14-00001	Hex Nut, #10-32	Service part / kit
14-00015	Hex Nut #6 - 32, Stainless Steel	Service part / kit
14-00817	Hex Nut M10 x 1.5 mm S/S	Service part / kit
14-01132	Hex Nut M6 x 1.0 S/S	Service part / kit
14-04401	Hex Nut, M5 x 0.8	Service part / kit
14-09711	Hex Nut, M8 x 1.25 S/S	Service part / kit
14-09830	Hex Nut, Nylock M12 x 1.75, S/S	Service part / kit
140036141	Valve Assembly	Service part / kit
140036220	Relief Valve Assembly	Service part / kit
140166130	Rotor	Service part / kit
140406500	Pick-up	Service part / kit
140607270	Oil Line	Service part / kit
140976080	Bracket	Service part / kit
1410-08601	Exhaust Manifold/ Expansion Tank	Service part / kit
1412-00030	Capscrew, Hex Head, M6 x 1.0 x 16 mm	Service part / kit
1412-00031	Capscrew, Hex Head M6 x 1.0 x 25 mm	Service part / kit
1412-01132	Capscrew, Hex Head M6 x 1.0 x 85 mm	Service part / kit
1412-09714	Capscrew, Hex Head M8 x 1.25 x 40 mm S/S	Service part / kit
1412-09956	Capscrew, Hex Head M12 x 1.75 x 65 mm S/S	Service part / kit
1414-00711	Hex Nut, M8 x 1.25	Service part / kit
1415-00702	Lock Washer M8	Service part / kit
145336490	Pulley	Service part / kit
145386520	Spacer	Service part / kit

Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.

Common questions

What is the oil capacity of the Northern Lights L773L?

The Northern Lights L773L engine has an oil capacity of 5.0 liters.

What is the displacement of the Northern Lights L773L?

The Northern Lights L773L has a displacement of 1.13 liters with 3 cylinders.

Which generators use the Northern Lights L773L engine?

The Northern Lights L773L powers 1 generator set(s), including Northern Lights NL773LW4.