Lombardini IM 250 Скачать руководство пользователя страница 15

respond  pas  à  cette  cote,  vider  la  cuve,  modifìer  la  hauteur  de 
l'épaisseur  de  poussée  aiguille  sur  le  flotteur, remonter  et  ré­
péter  l'epreuve  (Fig.  39). 

Vérifìer  qu'il  n'y  ai  pas  des  pertes  aux  tuyaux  et  aux  raccords. 

ALLUMAGE 

Il  est  du type  alternateur 

à 

haute tension  avec inducteur rotatif 

et  induit  fìxe. 

L'inducteur  est  un  aimant  piacé  dans  un  logement  à  la périphé­

rie  du  volane. 

L'induit est une bobine, fìxée sur le baci, à deux circuits, bobinés 

sur  un  paquet  de  lamelles,  de  basse  et  haute  tension. 

La  rotation  de  l'aimant  provoque  dans  la  bobine  une  varia­

tion  de  flux  magnétique  qui  induit  dans  le  primaire  un  courant 

à  basse  tension. 

Ce  courant  interrompu  par  le  rupteur  provoque  une  tension 
élevée  dans  le  secondaire  apte  à  créer  l'étincelle  entre  les 

électrodes  de  la  bougie. 

Un  condensateur  en  parallèle  au  contact  du  rupteur  évite  la 

formation de l'arc pendant l'ouverture des contacts et par consé­

quant  leur  grillage;  de  plus  il  permet  un  arret  rapide  du  cou­
rant  dans  le  circuit  primaire  pour  produire  dans  le  circuit  se­

condaire  la  haute  tension  pour  l'allumage. 

Détails  de  la  Fig.  40: 

1  - Bougie; 2  - Ressort du bouton d'arret; 3  - Bouton d'arret; 
4  - Condensateur;  5  - lnduit;  6- lnducteur  (aimant);  7  - Vi­
lebrequin;  8- Lamelle;  9  - Rupteur;  10  - Volane;  11  - Poussoir; 
12  - Paquet  lame 

les; 

13  -

Arbre  à  cames. 

Controles 

Bobine: 

Vérifìer  avec  un  ohmètre  et  remplacer  si  défectueuse. 

Caractéristiques 

des  circuits  électriques 

(Fig.  41). 

Résistance  du  circuit  primaire 

Résistance  du  circuit  secondaire 

0,44  Ohm 

3650 

Ohm 

Vérifìer  l'intégrité  de  l'isolane  du  cable  entre  la  bobine  et  les 

contacts  en  s'assurnnt  qu'ils  ne  soient  pas  à  la  masse. 

Yérifìer que le cable à la masse soit soudé  au paquet  de lamelles. 
Controler la connexion  du cabie  de haute  tension  sur  la  bobine 

et  sur  la  bougie. 

Aimant:  l'éfficience  de  l'aimant  peut  etre  réduite  si  le  volane 
est  soumi  à  des  chocs  répétés  ou 

à 

des  températures  élevées. 

Pour  la  controler,  placer  horizontalement  le  curseur  de  l'outil 

7000-9727-01  à  la  hauteur  de  l'encoche  (a)  (Fig.  42)  et  vérifìer 

qu'il  soit  attiré  par  l'aimant. 

17 

SERIE  IM 

lf fuel level is incorrect, empty bowl, adjust float lip accordingly, 
reassemble  cover  and  repeat  fuel  test  (Fig.  39). 
Make  sure  fuel  line  and  union  are  not  leaking. 

IGNITION  SYSTEM 

lgnition  is  of  che  high  tension  alternator  type:  rotating  in­

ductor  and  stationary  armature.  The  inductor  consists  of  a 

permanent  magnet  housed  on  the  flywheel  periphery. 

The  armature  is  formed  by  che  ccii,  secured  to  the  crankcase. 
The coi 

consists of  primary  (low  tension)  and  secondary  (high 

tension)  circuits  wound  on  a  pack of stampings. 

Magnet  rotaticn  produces  a  change  of  magnet  flux  linkage  in 

the  ccii,  which  causes  by  induction  a  low  voltage  tension  to 

build  up  in  the  primary  winding. 

Breaker points open  the  primary  winding  circuit  with  a  sudden 

collapsing  of  the  fìeld  set  up  around  the  windings,  thus  by  in­

duction  a  high  tension  c�rrent  is  sent  through  to  the  plug 

electrodes:  spark  occurs  due  to  electrode  gap  bridging. 

To  prevent  breaker  points  arcing  with  consequent  points  burn­
ing,  a  condenser  is  connected  in  parallel.  Condenser  also  helps 
to  obtain  a  high  tension  ignition  current  by  rapidly  stopping 
flow  of  current  in  the  primary  winding. 

Components  in  Fig.  40: 

1  - Spark  plug;  2  - Stop  pushbutton  spring;  3  - Stop  push  but­
ton;  4  - Condenser;  5  - Armature;  6 - lnductor  (magnet);  7  -
Crankshaft;  8 - Cam  follower;  9  - Breaker;  10  - Flywheel;  11  -

Pushrod;  12  - Armature  core;  13  - Camshaft. 

Checks 

Coi/:  check  with  an  ignition-coil  tester  spark  gap;  replace  if 

found  faulty. 

Electric  circuits  specifications  (Fig. 

41). 

Primary  winding  resistance 

Seconda.ry  winding  resistance 

0.44  Ohm 

3650 

Ohm 

Check  that  wire  from  coil  to  points  is  properly  insulated  and 

is  not  grounded. 

High tension  lead to  che  spark  plug  should  be examined if con­

nections  to  che  ccii  and  plug  terminals  are  correctly  done. 

N1agnet: 

Magnetic flux is seriously reduced if flywheel is subjected 

to high temperatures or  hit by hard blows.  To check  magnetic 
efficiency,  use  gauge  7000-9727-01.  Piace  gauge  horizontally 
as  in  Fig.  42;  align  gauge  slide  mark  with  mark "a" (Fig.  44) 
on  stationary  part:  from  this  position  the  magnet  should  pull 
the  gauge  slide  in. 

MANUEL  D'ATELIER  - WORKSHOP  MANUAL  - WERKSTATTHANDBUCH 

Bei  falschem  Kraftstoffstand  Gehause  entleeren,  Nadeldruck­
Lamelle  verbiegen  und  Kontrolle  wiederholen  (Abb.  39). 
Eventuelle  Kraftstoffverluste aus  Rohren und Anschlussen beach­

ten. 

ZUNDANLAGE 

Es  handelt  sich  um  ein  System  rnit  Hochspannungsdrehstrom­
Generator,  der aus einem rotierenden  Erreger  und einem festen 

Anker  besteht. 

Als  Erreger  dient  ein  Dauermagnetlaufer,  der  in  einer  Lucke 
des  Schwungradringes  angebracht  ist. 

Der  Anker  ist  arn  Kurbelgehause  befestigt.  Er  besteht  aus 
einer  Spule  mit  zwei  um  einen  Eisenblechkern  gewickelten 

Windungen  (Nieder-und  Hochspannung). 

Das  Drehen  des  Dauermagneten  verursacht  im  Anker  eine 

Veranderung  des  Magnetflusses,  die  in  der  Primarwicklung  der 
Spule  einen  Niederspannungsstrorn  erzeugt. 

Die  Unterbrechung  dieses  Strornes  verursacht  eine  Verstar­
kung  der  Spannung  in  der  Sekundarwicklung,  wodurch  der 
Funken  zwischen  den  Elektrodren  der  Zundkerzen  erzeugt 
wird. 

Ein  dem  Unterbrecher  parallel  geschalteter  Kondensator  ver­

hindert  bei  Offr.ung  der  Kontakte die  Funkenbildung  und somit 
ihr  Abbrennen.  Ausserdem  beschleunigt  er  die  Unterbrechung 
des  Prirnarstrornes  und  erhoht  dadurch  wesentlich  die  Sekun­
darhochspannung  fur  die  Zundung. 

Abbildung  40;  Benennung  der  Teile: 

1 - Zundkerze; 2 - Abstellungsknopffeder;  3 - Massendruckknopf; 
4  - Kondensator;  5  - Anker;  6 - Erreger  (Dauerrnagnet);  7 -

Kurbelwelle; 

8  -

Lamelle;  9  - Unterbrecher;  10 - Schwungrad; 

11  - Stossel;  12  - Eisenblechkern;  13 - Nockenwelle. 

Kontrollen 

Ziindspule: 

rnit  Magnetprufgerat  kontrollieren  und  ersetzen, 

falls  beschadigt. 

Merkmale  der  e/ektrischen  Wick/ungen  (Abb. 

41): 

Widerstand  der  Prirnarwicklung: 

0,44  Ohm 

Widerstand  der  Sekundarwicklung: 

3650 

Ohm 

Eventuelle Massenschlusse des  Kabels zwischen Spule und  Unter­

brecherkontakten  und  womoglich  schlechte  lsolierung  des 

Kabels  beachten. 

Beachten,  dass  das  Masseschlusskabel  auf  den  Eisenblechkern 

gelotet  ist. 

Anschlusse  des  Hochspannungskabels  an  die  Spule  und  an  die 

Zundkerze  kontrollieren. 

Dauermagnet: 

Eine  Entrnagnetisierung kann  eintreten,  wenn  das 

Schwungrad  stark  geharnrnert  oder  erhitzt  wird. 

Dauermagnet  wie  folgt  prufen: 

Der  Laufer  der  Lehre 7000-9727-01  muss  waagerecht  der  Marke 

(a) gegenuber  gestellt  werder,.  Der  Laufer  muss  vom  Magneten 

angezogen  werden  (Abb.  42).

. .

Fig.  39 

I---------

10 

Fig.  40 

Fig.  41 

17 

Содержание IM 250

Страница 1: ...serie IM monuel d atelier workshop monuol werkstotthondbuch servt Ce _ _ _ ___ D ___ __ ____ ...

Страница 2: ...3 Benzin Pétrole IM 302 7 9 5 4 4 5 1 5 5 6 5 3 600 1 51 2 300 Kerosene Petroleum Essence IM 350 7 9 5 7 6 1 7 8 3 600 2 03 1 800 Gasoline Benzin Essence IM 351 82 66 349 5 3 7 6 1 5 5 6 5 2 400 2 03 1 800 Gasoline 23 Benzin Pétrole IM 352 7 9 5 4 4 5 1 6 5 7 5 3 600 1 87 1 800 Kerosene Petroleum N B Sauf indicacions contraires les régles de réparations sane valables pour cous les moceurs de la sé...

Страница 3: ...omplaints that may be encountered during the service ife o the engine Be ore attempting disassembly or making any rep acement always check the easiest and most obvious things irst Die Tabelle enthalt die wahrend des Betriebes am haufìgsten auftretenden Stbrungen In jedem Fall ist es empfehlenswert vor der Demontage oder dem Auswechseln die einfachsten Kontrollen systematisch durchzufLlhren CAUS E ...

Страница 4: ...s may be found in the Master Parts Manual ENGINE IDENTIFICATION Engine type is marked on the plate placed on the air shroud The serial number is generally punched on the crankcase cast ing below the throttle contro assernbly Fig 1 ENGINE PLACEMENT Bolt engine on to overhauling stand using engine rnount threaded holes on carburettor side DISASSEMBLY Disassemble tank silencer air cleaner pulley and ...

Страница 5: ...pring from governor lever When disassembl ing case cover pay attention to gasket between crankcase and cover CAMSHAFT To remove the camshaft Disassemble breaker push rod Match timing marks on crankshaft and camshaft with piston at T D C of compression stroke Turn engine upside down and withdraw the camshaft With drawal of camshaft may be accomplished with engine in normai position by inserting a s...

Страница 6: ...ves 5 Spring plates 6 Springs 7 Spring locking plates 8 Tappets 9 Cylinder head VALVES GUIDES SEATS After disassembling and descaling with a wire brush check condition of valves and rep ace if valve mushrooms are out of sha pe cracked or too worn To reuse slightly worn valves we recommend restoring seat area D with a 45 valve grinder Dimension of va ves guides and seats after assembling in crank c...

Страница 7: ...ve or a pilot drift We recommend having this job done by a skilled MACHINING SHOP Seat and valve grinding or replacement always require lapping VALVE SPRINGS Check if springs are damaged or have lost their elasticity Spring free length must be 40 5 è 41 5 rnm H Fig 11 Springs compressed under a load of 17 0 è 17 5 Kg must have a length of 24 mm Repiace springs for lower length values CRANKCASE BRE...

Страница 8: ...beyond 0 10 mm rebore to next oversize and install oversize piston and rings as per dimension table PISTON AND RINGS Measure piston skirt diameter at 2 mm from base perpendi cularly to gudgeon pin Fig 17 Skirt wear not to exceed 0 05 mm Piston oversize scale mm Series Nominai 1 st Oversize 2 nd Oversize IM 250 69 87 69 89 70 37 70 39 70 87 70 89 IM 300 75 89 75 91 76 39 76 41 76 89 76 91 IM 350 81...

Страница 9: ...amaged On electric started engines flywheels are not interchangeable with the standard type When replacing see the Master Parts Catalogue RING GEAR Ring gear is fìtted to the flywheel of engines equipped with starter motor Check for worn or damaged teeth lf necessary replace ring gear as follows Heat up ring gear along inner circumference using a gas heating torch and remove from flywheel with a p...

Страница 10: ... or grinding make a Magnaflux check of the shaft to detect surface cracks After clearing or grinding the hardness of the journals should be SO è 55 Rockwell cf bel ow this value grind to next undersize or replace shaft Radius of shaft fillets must be 2 7 è 3 0 mm and journal surface must be neatly finished with out helical grooves and have a roughness of 0 2 è 0 4 micron Crankpin and end bearing d...

Страница 11: ...the series Camshaft with automatic decompressor The automatic decornpression device is fitted to camshafts of engines equipped with rewind starter or eiectric starting The device makes starting of the engine easy allowing flywheel to pickup momentum being the exhaust valve kept open Page 18 and 19 As camshaft rotates faster centrifugai force knocks decom pressor device off and the engine starts Ch...

Страница 12: ... spring tension is established with consequent change of engine speed Governor Check Check gear governor weights and their housings for burrs Axis of weight pins must be perpendicu ar to gear axis Drive rod surface on which weight skids work must be smooth and normai to the hole Play between drive rod and journal must be kept within 0 10 0 20 rnrn Should play be higher replace drive rod LUBRICATIO...

Страница 13: ...eam of air rushing through idle passage ldle rnixture adjustement screw 4 is to set best slow running speed Fig 34 C Acceleration when slightly increasing throttle opening vacuum at the idle channel is partly destroyed Fuel feeding from idle port almost stops A small hole progression hole 5 communicating with the idle channel provides a fuel supply as soon as the throttle valve 2 starts to open Fi...

Страница 14: ... turn freely Spindle diameter must be 5 975 7 5 988 mm Replace spindle if diameter is smaller or if spindle to housing clearance exceeds 0 20 mm At fully closed position of the throttle valve distane from idle discharge hole to the valve face should be 0 04 è 0 06 mm replace cover for different values Check that choke valve is not worn and that butterfly fully turns throughout its travel Fig 37 Ch...

Страница 15: ... high tension ignition current by rapidly stopping flow of current in the primary winding Components in Fig 40 1 Spark plug 2 Stop pushbutton spring 3 Stop push but ton 4 Condenser 5 Armature 6 lnductor magnet 7 Crankshaft 8 Cam follower 9 Breaker 10 Flywheel 11 Pushrod 12 Armature core 13 Camshaft Checks Coi check with an ignition coil tester spark gap replace if found faulty Electric circuits sp...

Страница 16: ...lli cw 4 N cw 2 N Bosch w 10 A w 12 A Champion L 90 KLG F 50 Clean spark plug electrodes using a wire brush and remove dirt with compressed air Reset electrodesgap to 0 7 0 8 mm Fig 45 Replace spari plug every 300 hours and whenever insulator is cracked or ground electrode is badly worn Breaker Check breaker points replace points assembly if contact tips are badly burnt or damaged A light oxide co...

Страница 17: ...ly unwound rope Rewind starter tension with completely wound rope must be 1 2 1 5 Kg after initial friction has been taken up Fig 47 Replace spirai spring 7 if found broken Spare springs are supplied coiled up and tied with wire Do not remove wire until spring is correctly seated and mak e sure that spring winds up when turning pulley in direction of engine rotation ELECTRICAL EQUIPMENT Electrical...

Страница 18: ... 7000 9727 01 Fig 50 Rest one end of tool horizontally on rnagnet poles Hold tool slider on casing rnatching rnarks C and A Let slider free if it is not pulled in by the rnagnet rotor is demagnetized and must be replaced Chech that stator windings have no unsoldered connection burn marks or earthed wires replace stator if faulty With an Ohrnmeter check for continuity between alternator leads and f...

Страница 19: ...ter motor The motor type is AMERICAN BOSCH 11277 28 MO 20 SM 0 22 HP output Fig 55 shows rating curves P starting torque M R P M and voltage V at starter motor terminals in relation to current absorbed Amp and battery capacity at 20 C ambient tem perature For repairs and overhauls contact BOSCH service Stations Battery The 12 Volt battery must have a minimum capacity of 36 Ah at the ten hour disch...

Страница 20: ...ce a 0 5 mm diameter copper wire te act as fuse Connect a 15 Amp D C ammeter in series between termi nal 8 30 on regulator and battery positive terminal Fig 57 lf necessary start engine a few times or switch lights on unti battery tension drops below 13 Volts Diagram in Fig 58 shcws current values Amp referred te engine speed A and starter generator speed B with a constant 12 5 Volts battery volta...

Страница 21: ...attery charge Wiring diagram and components for 12 V 50 Watt alternato Fig 61 1 Armature winding 2 lnductor 3 Rectifying bridge 4 Battery not supplied 5 Utilizers 6 Keyswitch Connect lights for a totaI current absorbtion of 48 50 Watts and set engine speed at 3600 R P M Tension should be approx imately 12 Volts easily detected by observing the light bright ness lnsert a 5 10 Amp D C ammeter betwee...

Страница 22: ...gm when engine is equipped wi th alternator OIL SEALING RINGS Seals must be replaced if marks of burns or cracks and sealing faces are detected Always renew seal rings when disassembling bearings P T O side CRANKSHAFT Heat ball bearing in oven to 120 7130 C and press it in For checks and replacements see pag 11 Mount cranksaft complete of ball bearing into crankcase placing on the threaded end the...

Страница 23: ...TIMING Piace piston at T D C and turn crankcase upside down to insert tappets lnsert camshaft with thrust face flat section facing tappets only position for assembly of shaft Fig 70 and return crankcase to upright position Match timing marks on camshaft gear and drive gear On engines equipped wich rewind starter or electric Harter assemble camshaft with automatic decompressor lf gears do not bear ...

Страница 24: ...sert it changing meshing position unti correct value is obtained IGNITION Coil and breaker lnsert the pushrod on its seat of the crankcase Mount pushrod plate and breaker tightening the three screws Set maximum opening gap of points to 0 65 0 70 mm by acting on adjusting screw of stationary contact Assemble ccii without tightening bolts Connect a timing light to switch on when points are closed Tu...

Страница 25: ...ening nuts to 4 Kgrn Spark plug torque to 3 5 Kgm Starter motor where provided tighetening nuts to 1 0 Kgm Airshroud Head cooling air baffle Carburettor and rnanifold assembly after tielink and spring have been connected to the throttle contro lever Torque nuts to 0 8 Kgrn Connect breather tube to air cleaner and assernble air cleaner Throttle housing hanging up again the springs to the car burett...

Страница 26: ...Fig 80 and act on valves untiI a circular mark is 0btained on the white paper Tighten nut D Fig 80 avoiding to move the valves Adjust gas outflow with engine stopped acting on adjust ing screw A Fig 81 Connect a pressure gauge to out flow elbow and see that gas pressure dces not exceed 10 15 mm of water column Similarly with soap foam applied to outflow see that bubble made by gas swalls slowly if...

Страница 27: ... 11 Housin Reduction gear P T O rotates anticlockwise i e same dire tion of engine P T O Reduction gears are suitable either f g e or direct or Kbelt drive Maximum Kbelt bending load on sh3ft end is 100 Kg and distance from pulley center line coupling face must not exceed 35 mm with the pulley pit to eh diameter equa to 90 mm Check nd Replace ball bearings if radiai play is excessive or if balls a...

Страница 28: ...y Diameter 74 94 74 97 104 93 è 104 96 Out of round a b 0 005 Heat ball bearing in oven to 80 C and press it into gear shaft Assemble gear in the case and lock it with stop plate Tighten stop plate screws to 0 8 Kgm Fig 88 Side clearance bet ween gear face and stop plate must be 0 10 7 0 15 mm Fit pinion 9 on crankshaft torquing bolt to 2 0 Kgm Assemble housing 11 on engine case cover inserting it...

Страница 29: ...e remove bearings 0 017 Shaft diameter must be 25 0 008 and is net te be ground_ Clutch disk must be free from scores or cracks Disk thick ness must be 3 2 80 mm Thickness of friction materiai is 1 0 mrn on both sides Replace clutch disk if friction materiai thickness i less than 0 3 mm on both sides Note lf springs are damaged or have lost elasticity replace clutch device 8 Assembly Fix housing 3...

Страница 30: ... play is excessive or if balls and ball races are demaged Use pullers 7271 3595 28 7070 3595 26 to remove bearings Shaft diamete must be 29 99 30 00 mm and is not to be ground Centrifugai unit housing must have a smooth surface free from projecting burrs and roughness Housing diameter is 100 0 100 1 mm Out of round limi t i 0 05 mm Fig 92 External face of centrifugai unit must not be rough and sho...

Страница 31: ...overhaul test may last 90 minutes Start the engine and gradually open choke valve Far engines operating on kerosene fuel start engine on gasoline and warm up far approximate y 2 minutes before turning shut off valve to kerosene feeding position Set and keep engine speed at 2 000 R P M for 10 minutes Accelerate engine repeatedly to ascertain that throttle valve and linkages work smoothly Never oper...

Страница 32: ...TTING OF MAXIMUM SPEED Accelerate engine fully and check that maximum idle speed is 3750 è 3800 RPM 2550 2600 RPM for IM250 engines for IM251 engines Adjust screw B Fig 97 accordingly to set maximum speed to above values and tighten its lock nut RUN IN During fìrst 10 hrs of engine operation apply load progressively without exceeding 70 of maximum rated power Note Mentioned adjustement is valid fo...

Страница 33: ...e Wrap engine in a plastic sheet Store engine in a dry piace possibly off the ground and away from high power lines Permanent protection over 6 months After procedure as above has been followed we recommend taking further precautions namely Treat rnoving parts with anti rust oil with MIL L 21260 P10 grade 2 SAE 30 characteristics such as ESSO RUST BAN 339 or Valvoline Tectyl 873 Turn engine and dr...

Страница 34: ...ine Operation Sloping sense Discontinuous Continuous Longitudinal 4011 35 Transversal FLYWHEEL DYNAMIC MOMENTUM The flywheel dynamic momentum is 1200 Kgcm2 EXHAUST Exhaust back pressure depends on muffler restriction Ma ximum permissible back pressure must be 60 mm of mercury column taken on manifold between flange and muffler END THRUST ON POWER TAKE OFF End thrust in both directions must not exc...

Страница 35: ...RE KRAFTABNAHMEN UNO FLANSCHE O UiO 37 su SERIE IM EXTENSION A3 21 11 11 IOU LI 96 EXTENSION 4SAE MANUEL D ATELIER WORKSHOP MANUAL WERKSTATTHANDBUCH EXTENSION EXTENSION 4 a 4 A 1IO 11 0 EXTENSION 9 SAE L_J EXTENSION SA 1 n 1os2 2s hl lA 1197 100 l 100 1 L tj EXTENSION a3 B S 1 O I I EXTENSION 7 SAE 617 10 ht 1S I E 135 2 514 65 t l 950 100 2 37 ...

Страница 36: ...nt Elektrische AusrLlstung lnstallation démarreur et alternateur Starter mo tor a ternator Anlage mit Anlassmotor und Dreh Stromgenerator Installation avec dynastart Starter generator An lage mit Lichtanlasser lnstallations éclairage Lighting alternator Licht Anlage mit Drehstromgenerator MONTAGE ET MISE AU POINT ASSEMBLY AND TUNING ZUSAMMENBAU UND EINSTELLUNG VI lntroduction Einleitung Bati Crank...

Страница 37: ... I n intermotorS JlO la LOMBARDINlcompanyl liW 02100 RIETI ITALY Casella Postale 107 Tel 0746 72 041 intermotor Telex 612595 lmotor Mod 334 700 I 1 84 ...

Отзывы: