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:
M673L and NL673L, which both use the 673 engine.
Model Numbers
Model numbers give the unit's application, block model, aspiration, and RPM:
M - NL673
M - Northern Lights marine generator set
NL - Northern Lights industrial generator set
M 673L
NL 673L
Northern Lights marine diesel generator set
with a 673 engine and a TF-276KM or TF-276D
generator.
Northern Lights industrial diesel generator set
with a 673 engine and a TF-276KM or TF-276D
generator.
Model number of engine block
BoreCylinders
67 mm3
Serial Numbers
Your set has three serial numbers: ➀ an engine number stamped on the block, ➁ a generator plate,
and ➂ a generator set plate. Use the serial number on the generator set plate when ordering parts
or in correspondence. The generator set plate is found on the service side of the generator
and resembles the drawing below.
Generator Set Serial Number
P673L 09/03
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.
120401062031Bearing130641000451Expansion Plug140423030151Bearing150305005121Dowel Pin160305006162Dowel Pin170305008202Dowel Pin180303090052Lock Pin190121106202Stud M6 x 1.0 x 20 mm200121006351Stud M6 x 1.0 x 35 mm210121006601Stud M6 x 1.0 x 60 mm220365090051Retaining Ring231109965901Gasket240115008601Bolt
3101010923518Capscrew, Hex Head Phillips M6 x 1.0 x 14 mm321201161801Tappet331987360501Drain Cock341405460201Adapter3524-080011Oil Filter361107560701Dipstick Tube370521001002O-Ring380113006121Capscrew, Hex Head with Washer M6 x 1.0 x 12 mm391984163501Dipstick401201161006Tappet411204563206Push Rod421400362201Relief Valve Assembly430521090781O-Ring460681152001Hose4715-007011Flat Washer M84815-007021Lock Washer M84914-007111Nut M8 x 1.2550010401212**Plug, Hex Head M12x1.25
51025100012**Sealing Washer
181153262603Piston Pin190365000196Snap Ring201150263503Connecting Rod Assembly
211985173253Bushing221151761306Connecting Rod Bolt230201091036Nut241985173116Bearing, standard-
90368000101Snap Ring130521090761O-ring141409865901Oil Pipe151404063101Suction Filter160113106122Capscrew, Hex Head with Washer M6 x 1.0 x 12 mm171651662801Front Plate
1651662701Front Plate
181659964901Gasket190113006123Capscrew, Hex Head Phillips M6 x 1.0 x 12 mm-
101201861006Retainer1112022608012Valve Keeper120121106501Stud, M6 x 1.0 x 50 mm131202161306Valve Cap141101362903Intake Valve Seat151111474001Head Gasket, Thickness = 0.5 mm1611113646011Head Bolt, 10 mm Hex171111364703Head Bolt, 10 mm Hex180121091773Stud Bolt191200367011Rocker Arm Assembly
201203562003Rocker Arm - Intake211203562103Rocker Arm - Exhaust221994862206Screw230201090766Nut241203461713Rocker Arm Bracket251203161901Rocker Arm Shaft261982170802Spring270646090062Plug280303003251Spring Pin291992802804Shim320231000083Hex Nut M8 x 1.25 Flanged331985163401Lifting Eye340115108161Bolt391409962607Sealing Washer460113106505Capscrew511958163901Lifting Eye
(Industrial)-
520115108201Bolt531406072901Oil Pipe541984867802Bolt551Oil Pressure Switch
570231000061Hex Nut M6 x 1.0, Flanged5921-001391Adapter 1/8 BSPT x 1/8 NPT
0645000101Plug 1/8 BSPT
(without Oil Pressure Sender)-
601984867201Female Tee, 1/8 BSPT61198486380**Hex Nipple, 1/8 BSPT621202161306Valve Cap – Late Production-
(Industrial)-
(Marine)-
(includes keys #20 - #32)-
(see Electrical System)-
(with Oil Pressure Sender)-
**As required
P673L 09/03
1 - 7
GROUP 1 – ENGINE
Rocker Arm Cover
Industrial Application
FIG. 1-8
KEYPART NUMBERQTYDESCRIPTIONSERIAL NUMBER
11110261801Rocker Arm Cover21109865001Pipe31106661201Filter41106661101Oil Stopper50101006102Bolt60113106502Bolt71119963301Gasket81119960601Gasket-
91981163801Rubber Cushion101359765701Bracket110115108202Bolt121359761201Bracket131351561001Filter Housing144086200041Valve154086200021Element164086200051Packing174086200061Packing180141006201Wing Bolt191353260601Rain Cap with Clamp-