HUSQVARNA ENGINES

 

HUSQVARNA CONDENSED SERVICE DATA
ENGINE MODEL       SM150

 

Bore—(mm)     60

Inches 2          362

Stroke—(mm) 52

Inches 2          047

No. of Cylinders           1

Displacement—(cc)      147

Cubic Inches    8.9

Horsepower @ RPM   10 @ 6500

Carburetor Model        HL230A

Number Used   1
Ignition:

Type    Flywheel Magneto

Point Gap—(mm)         0.4

Inch      0.016

Timing Advance?          No

Timing BTDC—Degrees          24°
Spark Plug:

Bosch   W225T1

Champion         L78

Electrode Gap (mm)     0.5

Inch      0.020

Fuel/Oil Ratio   25:1

MAINTENANCE

CARBURETOR. A Tillotson, Model HL, diaphragm type carburetor is used on snowmobile engines. Refer to TILLOTSON Carburetor Section for over-haul information.

LUBRICATION. The engine in lubricated by oil mixed with the fuel. The engine manufacturer recommends the use of Regular gasoline and a reliable, known brand two-stroke oil at a ratio of 25:1.

Mix fuel and oil thoroughly using a separate container, before pouring mixture into fuel tank. For cold weather blending, pre-mix the oil with a small amount of gasoline and shake thoroughly until mixture is liquid, then blend with remainder of fuel. Do not use kerosene or fuel oil for pre-mixing.

IGNITION AND TIMING. The breaker cam is machined on crank-shaft. Blower housing and flywheel must be removed for service on ignition system.

NOTE: Flywheel nut is left-hand thread.

A special tool, Husqvarna Part No. 17 10 199-04 is necessary for easy and accurate ignition timing, because fly-wheel must be removed for access to points and piston position cannot be measured. If the special tool is not available, carefully mark the armature plate position before removal and ad-just point gap with extreme care. The adjusting tool is shown in Fig. 2 and its use is demonstrated in Fig. 3; proceed as follows:

 

Fig. 2-A special timing tool, Husqvarna Part Number 17 10 199-04 is needed for accurate
timing. Refer to text.

First examine and renew parts as required. Install the timing tool as shown and turn crankshaft until long leg of tool aligns with threaded hole in cylinder as shown. Loosen the mounting screws if necessary, and turn armature plate until edge of ignition

coil (2) aligns with short pointer of tool shown at (3). Retighten armature plate retaining screws and using a buzzer (6) or continuity meter, adjust the breaker points until they just begin to open.

If the flywheel has two key ways marked "A" and "B", use key way marked "B" if engine is equipped with lighting coil. Tighten flywheel retaining nut to a torque of 30 ft.-lbs.

REPAIRS DISASSEMBLY AND REASSEMBLY. To disassemble the re-moved engine, first remove muffler, decompression valve, spark plug, air cleaner and carburetor. Blower housing and recoil starter assembly can be removed as a unit after re-moving the three slotted head retaining screws.

Ball type main bearings are a tight fit on crankshaft, and in the aluminum crankcase at room temperature. Heat the crankcase assembly to approximately 275° F. in an oven or kiln after removing cylinder, piston, magneto assembly and Allen head crankcase screws; then bump housings from crankcase using a plastic hammer as shown in Fig. 4.

The cylinder is available only in an assembly which includes the piston, but pistons are available separately as are the piston rings. Cylinders are classed as to size and coded "A" to "E". Be sure to state size code when ordering piston only.

Fig. 4-Heat crankcase to 275° F. for crankshaft
removal. Refer to text.

Fig. 3-Using timing tools for
engine adjustment.

1. Lighting coil

2. Ignition coil

3. Align pole shoe

4. Breaker points

5. Stop cable

6. Timing buzzer

  

 

 

ENGINES JLO

 

JLO ONE CYLINDER MODELS

CONDENSED SERVICE DATA

ENGINE MODEL     L99

 

Bore—(mm)    

Inches

Stroke—(mm)

Inches

No. of Cylinders          

Displacement—(cc)     

Cubic Inches   

Horsepower (a RPM   

Cooling type    

Carburetor Model        HL

Number Used   1

Ignition:

Type    E120

 

Point Gap—(mm)         0.3-0.5

Inch      0.015

Edge Gap—(mm)         8.5-12.5

Inch      0.334-0.492

Timing Advance?          No

Timing BTDC (mm)      2.1-2.5

Inch      0.082-0.098

Degrees           

Measured at    

Spark Plug:

Bosch   M240T1

Champion        

Electrode Gap (mm)     0.4-0.5

Inch      0.018

Fuel/Oil Ratio   20:1

 

ENGINE MODEL     L295

Bore—(mm)     74.5

Inches 2.933

Stroke—(mm) 67

Inches 2.638

No. of Cylinders           1

Displacement—(cc)      292

Cubic Inches    17.8

Horsepower Cu RPM 18.50 5500

Cooling Type   

Carburetor Model        HR, HD

Number Used   1 Ignition:

Type    SCP1V 12V

/75W Point Gap—(mm)           0.35-0.45

Inch      0.016

Edge Gap—(mm)         17.5-22.5

Inch      0.689-0.88

Timing Advance?          Yes

Timing BTDC (mm)      3.0-3.5

Inch      0.118-0.138

Degrees           

Measured at      Spark Plug:

Bosch   M240T1

Champion         K57R

Electrode Gap (mm)     0.4-0.5

Inch      0.018

Fuel/Oil Ratio   20:1

MAINTENANCE

SPARK PLUG. The recommended plug for normal service is given in CONDENSED SERVICE DATA Tables. Hotter or colder plugs may be used.

 

JLO     ENGINES

a carburetor without fuel pump. See Tillotson carburetor section for operation and overhaul procedure.

Refer also to Figs. 1 through 4 for views of pulse passages and induction ports. Internal pulse passage (1—Fig. 1 and P—Fig. 3 & 4) is not present in all engines. The tapped hole for plug (2—Fig. 1 or 3—Fig. 2 & 3) is always present. If internal pulse passage (P) is present and used, hole in gaskets, cylinder shield, adapter flange and carburetor must be open and aligned and plug (2—Fig. 1) must be installed.

On HL carburetors, initial adjustment is 3/4 turn open for idle adjustment screw and 11/a turn open for main adjustment screw. On HR or HD series carburetors, initial adjustment is one turn open for both needles. Both needles must be readjusted for smoothest engine operation after unit reaches proper operating temperature. Refer to CARBURETOR SERVICE SECTION for overhaul and additional service in-formation.

IGNITION AND TIMING. Timing specifications for individual engines

Fig. 1-Carburetor adapter flange of the type
equipped with internal pulse passage for fuel
pump operation. External passage port must
be plugged as shown.

A. Adapter flange

1. Pulse passage

2. External port plug are given in CONDENSED SERVICE DATA TABLES. Timing can be checked on models with fixed timing using a light or buzzer, by connecting the tester to kill switch wire or external coil wire and a suitable ground, then measuring piston position through spark plug hole. Flywheel must be removed to adjust points or timing.

On models L227, L230, L295, L297, L300 and L340, recoil starter must be removed separately from fan cover as shown in Figs. 5 through 7. On all

Fig. 3-Intake port of cylinder with adapter
flange removed, showing the drilled pulse
passage (P). Refer to Figs. 1 & 2 for assembled
options.

Fig. 4-Cylinder installed on crankcase halt
showing relative location of cylinder ports.

E. Exhaust port P. Pulse passages

I. Intake port    T. Transfer ports

models, the special puller (7--Fig. 9) is essential for flywheel removal.

On models with automatic timing advance, a hole is provided in flywheel which can be used to block the weight in advance position for timing adjustment.

On some models with fixed timing, the breaker cam can be installed for clockwise or counter-clockwise crank-shaft rotation. The cam may be marked

Fig. 6-With starter removed as shown in Fig. 5,
remove the three screws (2) and lift off starter
hub (3) and rope pulley (4). Fan cover (5) can
now be unbolted and removed.

Fig. 2-Carburetor adapter flange (B) is type not
equipped with internal pulse passage. Fitting
(3) in external passage port operates fuel
pump. Refer also to Figs. 1 and 3.

Fig. 5-Recoil starter is retained by four slotted
screws (1). On some models, starter must be
removed separately for access to flywheel.

 

Fig. 12-Exploded view of JLO L297 engine. All engines except L252 and L152 are similar. For parts
identification use Fig. 11 except for: 23. Needle roller bearing.

with the letters "R" and "L" which refers to direction of rotation when viewed from drive end; or by arrows which point to direction of rotation. Flywheel key must be installed in notch marked "L" for normal rotation on cams marked with the letters.

LUBRICATION. The engine is lubricated by mixing oil with the fuel. A suitable two-cycle, air cooled engine oil

1. Fanwheel

2. Flywheel nut

3. Flywheel

4. Breaker cam

5. Armature plate

6. Crankshaft seal

7. Fan housing

8, Crankcase half

9. Main bearing

10. Crankshaft assembly

11. Spacer (governor gear)

Fig. 11-Exploded view of JLO L252 engine. 1.152 is similar.

is recommended. Standard grade SAE 30 Automotive Motor Oil may be used if two-cycle oil is not available.

Recommended fuel/oil mixture ratio for each engine model is given in CONDENSED SERVICE DATA Tables at the beginning of this section. Mix fuel and oil thoroughly in a separate container before pouring mixture into fuel tank. For cold weather blending, pre-mix the oil with a small amount of gasoline and shake thoroughly until the mixture is liquid, then blend with remainder of fuel. Do not use kerosene or fuel oil for pre-mixing.

REPAIRS

TIGHTENING TORQUES. Recommended tightening torques are as follows:

Flywheel Nut

Model L99       29-32 ft,-lbs.

Model L152     20-25 ft.-lbs. Model L197, L227, L230 32-36 ft.-lbs.

Model L252, L292       43-50 ft.-lbs. Models L295, L297, L300, L340,

L372, L380, L395       79-86 ft.-lbs.

Standard Nuts

6mm     80-85 in.-lbs.

8mm     16-18 ft.-lbs.

10mm   31-33 ft.-lbs.

DISASSEMBLY AND REASSEMBLY. Refer to Figs. 11 and 12 for exploded views of engines. When service is required, first remove engine as

12. Gasket

13. Crankcase half

14. Crankshaft seal

15. Bushing

16. Piston pin

17. Piston

18. Ring set

19. Cylinder gasket

20. Cylinder

21. Head gasket

22. Cylinder head

 

 

JLO     ENGINES

outlined in vehicle section of this manual and remove carburetor, drive sheave, recoil starter and muffler. NOTE: Some engines installed on BOLENS HUS-SKI are counter-rotating (clockwise, viewed from drive end). All other engines are normal (counter-clockwise) rotation.

Cylinder and/or cylinder head can be removed without further disassembly of engine. Crankshaft main bearings (9) are a tight press fit on crankshaft and in crankcase at room temperature. Bearing area of crankcase should be heated for disassembly. Some engines use the governor drive gear (11) as a spacer when engine is assembled. Crankshaft and connecting rod are available only as an assembled unit.

When assembling the crankcase, heat main bearings (9) in oil to approximately 160°-200° F. and install on shaft, supporting shaft underneath the counterweight to prevent misalignment. Heat bearing area of crankcase halves, being careful not to damage oil seals. Assemble by reversing the disassembly procedure. Refer to the appropriate following paragraphs for further disassembly and inspection procedure.

PISTON, RINGS & CYLINDER. Piston pin is a floating fit in piston and connecting rod. Piston rings are pinned in place as shown in Fig. 13. Three ring pistons or pistons with one ring are sometimes used.

Pistons are marked for size (S—Fig. 14) and for proper installation, the letter "V" and Arrow pointing toward exhaust port (E). Pins in ring grooves (P—Fig. 13) are installed toward fly-wheel end of crankshaft.

The cylinder head on some models contains a "Squish Area" (Fig. 15). The position of correct head installation is not marked, but flat area should go toward exhaust port as shown.

On snowmobile engines except earlier Model L372, the cylinder, gaskets and carburetor adapter flange are drilled to provide a pulse passage for operation of the diaphragm type fuel pump built into the carburetor. Be sure drilled passages are open and aligned when parts are installed.

Upper connecting rod bearing is' bushing type on Models L152 and L252and a needle roller bearing on other models.

CRANKSHAFT & CONNECTING ROD ASSEMBLY. The crankshaft and connecting rod unit is available only as an assembled unit and disas-

sembly is not recommended. Bearings are a tight press fit on shaft and in crankcase bores at room temperature. Heat bearings in oil to a temperature of 160°-200° F. and support crankshaft between counterweights before in-stalling bearings on shaft. On some engines, governor drive gear (11—Fig. 11) is used as a spacer for pto side bearing.

Figs. 17 & 18 show details of the "Piston Guided" rod used on many late models. The rod is positioned by piston bosses rather than by big end, and critical centering of crankshaft in crankcase is not necessary.

RECOIL STARTER. The basic re-coil starters can be assembled for clock-wise or counter-clockwise engine rotation, although some of the parts may not be machined for counter-rotation. Fig. 19 shows a removed starter correctly assembled for normal rotation (counter-clockwise viewed from drive end).

Fig. 15-On models with squish area built into combustion chamber, flat portion should be
installed toward exhaust ports as shown.

Fig. 17-Crankshaft end of "Piston Guided' connecting rod. Refer also to Fig. 18.

Fig. 16-Crankshaft and piston unit used on
L340 engine. Other models with full circle
crank are similar.

Fig. 18-"Piston Guided" connecting r pushed forward to expose bearing roils Lower end of rod is centered on crankshaft

the piston.

 

Fig. 13-Pins (P) in ring grooves prevent rotation of ring ends into cylinder ports and
consequent ring breakage. Piston is installed with pins (P) toward flywheel end of crankshaft.Fig. 14-Top of piston showing size marking (S) which gives exact diameter of piston at skirt; and letter & arrow marking (E) which must be installed toward exhaust side of cylinder. Other markings shown have no service significance.

To disassemble the removed starter unit, remove the four screws and lift offFig. 19-Recoil starter of the type used on most models.

Fig. 20-7o disassemble the starter, remove the retaining screws and lift off cover plate (1).
Engaging brake units consist of friction cups (2 & 4) and spring (3) which fit holes in pawls and may fall out when cover (1) is removed.

Fig. 21-Springs (6) return pawls (5) to running (disengaged) position. Pawls may be lifted off
after removing cover plate (1-Fig. 20) and unhooking springs (6). Inner cover (7) can be
lifted off after pawls are removed. cover plate (1—Fig. 20). Items (2, 3 & 4) comprise an engaging brake which overcomes tension of return spring (6—Fig. 21) and causes pawl engagement when starter rope is pulled. Be careful not to lose these parts when cover plate is removed. Unhook springs (6) at pulley end, then lift off pawls, en-gaging brake and inner cover (7).

If rope is intact, remove handle grip and wind rope end into housing. Working through pulley anchor hole (C—Fig. 24) disengage inner end of spring from pulley and carefully lift off pulley. Spring (9—Fig. 23) will remain in recess of housing as shown if inner end is properly disengaged.

When assembling, unseat inner rope anchor from hole (R—Fig. 24) in pulley

Fig. 22-Disassembled view of pawl (5), engaging brake (2, 3 & 4) and return spring (6).
Refer to Fig. 20 or 21 for correct installed position.

Fig. 23-View of starter housing with pulley removed, showing proper installation of recoil
spring. Loop (B) in inner end anchors in hole (C) in pulley. Outer end is installed over anchor
pin (A).

8. Pulley           B. Inner loop

9 Spring           C Anchor hole

A  Anchor pin   Instatton tool holes and withdraw the rope. Make sure spring is installed as shown in Fig. 23. Working through anchor hole (C) with a suitable punch to make sure spring is anchored in pulley, reinstall the pulley without the rope. Insert a punch (P—Fig. 25) part way into pulley and completely wind the spring. Allow spring to uncoil until anchor hole (R) is aligned with outlet hole (X—Fig. 24), then block pulley from further rotation by wedging punch (P) against spring anchor pin (A—Fig. 23). With pulley correctly positioned, install rope from inside as shown in Fig. 24 and 25. Complete the assembly by reversing the disassembly procedure.

Fig. 24-Opposite side of spring anchor hole © (See Fig. 23) permits insertion of punch for
aligning spring end. Insert punch (P) and wind recoil spring completely; then back off until
rope anchor hole (R) aligns with outlet hole (X)in housing. Insert rope cable from inside as
shown.

Fig. 25-Rope anchor (R) properly seated in pulley. Install starter grip, then allow spring to
slowly recoil.