Toro 30113 Service Manual

JLO L/RM252 ENGINE MECHANICS HANDBOOK

Table of Contents – Page 1 of 1

PREFACE TECHNICAL DATA

OPERATING - AND MAINTENANCE INSTRUCTIONS A. BEFORE STARTING B. SERVICE AND MAINTENANCE C. ADDITIONAL INSTRUCTIONS D. GENERAL TROUBLE SHOOTING

ASSEMBLY GROUP 1 RECOIL STARTER

ASSEMBLY GROUP 2 FLYWHEEL, IGNITION SYSTEMS

ASSEMBLY GROUP 3 TIMING PROCEDURE

ASSEMBLY GROUP 4 SPEED CONTROL - RM 252 FLYBALL GOVERNOR ADJUSTMENT INSTRUCTIONS - MECHANICAL SPEED CONTROL--L 252 TOP SPEED LIMITER

ASSEMBLY GROUP 5 CARBURETTOR, CARBURETTOR DATA

ASSEMBLY GROUP 6 PISTON, CYLINDER

ASSEMBLY GROUP 7 CRANKCASE,CRANKSHAFT-RM 252 CRANKCASE , CRANKSHAFT - L252

TABLE OF SPECIFICATION

MECHANIC'S HANDBOOK

L/RM

252

MOTOR

SERVICE

1

U

7

5

1

4

CONTENTS

Page

General vic

of

Table Preface Technical data Operating and maintenance instructions

Assembly group 1 recoil starter

contents

2 flywheel, ignition systems 3 4 speed control

timing procedure

RM

L

5 carburettor, carburettor data 6 piston, cylinder

7 crankcase, crankshaft

L

of

Table Notes

Index of sales offices

specification

embl of engine ass

252 flyball governor

252 top speed limiter

RM

252

1 2 3

4

5-

6

7-

8

9-10

11-12

13-16 17-18

19-20

21-22

23-24 25-26

27-28 29

30

This Mechanic's Handbook contains comprehensive information to properly operate, service, and repair JLO en-

L

252

and

RM

gine models

252.

The repair procedures are described in detail and are

supplemented by useful illustrations.

1.

2.

3.

Each assembly group

is

subdivided into DISASSEMBLY

and ASSEMBLY. The illustration numbers shown in the general view

on page

1

refer to the individual assembly groups

in the procedure section.

When ordering replacement parts, please refer to

the pertinent spare parts list to determine the correct part number. If the required spare part cannot be identified, please describe the part and

state engine model and serial number (shown on name plate) on your order form.

In case of a complete engine overhaul, please do

not try to save money by re-using worn or defec-

tive parts. It is always more sensible to replace

one part too many than to re-use a part which

condition is doubtful. When repairing an engine

is

which

in poor condition, please use available shortblocks rather than repairing the engine with individual parts. This and the use of JLO subassembled repair kits will help to save time and

money.

of

The part numbers and exact descriptions

shortblocks and repair kits may be found at the end of the spare parts list.

4.

5.

Always use genuine JLO spare parts!

To secure certain screws or nuts, a thread locking compound

249",

"Casco

used.

184"

We

recommend to use "Loctite

or equivalent.

is

Edition

10/86

3

Type

L/RM 252

Piston displacement

Stroke

Bore

Compression ratio

Spark plug

Spark plug gap

Spark plug thread

Timing BTDC

Breaker point gap

Ignition system 12 Volt/40 Watts internal ignition coil,

primary

internal ignition coil, secondary resistance

internal ignition

generating coil

resistance

247

cm³

(15.057 in³)

66

mm

(2.598")

69

nun

(2.7165")

7:1

CHAMPION L86C, L87YC

M 14x1.25 - 12.7

2.8 - 3.2

0.3 - 0.4

Minimum Maximum

1.60

Ohms

5,300

Ohms

N/A

BOSCH BERU W7AC 175/14C (Heat value 145-225)

0.5

mm

(0.020")

mm

long

mm

(0.110" to 0.126")

mm

(0.012" to 0.016")

2

.00

ohms

5,800

Ohms

Ignition system 12 Volt 75/98 Watts external ignition coil,

primary resistance

external ignition coil, secondary resistance

internal ignition generating coil

(bottom coil with black wire) 3.0

lighting coil (12 Volt 75 Watts)

(with yellow and yellow/black wire)

lighting coil 12 Volt 23 Watts

(top coil with green and green/black

wire)

condenser

Fuel

Lubrication oil

Locking compound

0.80

7,800

0.43

0.24

0.20

Regular

Mixture ratio

Important: During initial break-in period (approx. 20 hours) use fuel/oil mixture ratio of 25:1

Use special two-stroke oil, e.g. CASTROL SUPER AQUAGLIDE, etc.

If not available, use oil SAE 30 or 40 or known brand

LOCTITE No. 241 / CASCO No. 148

Ohms

mm

(.008")

fuel or regular lead-free fuel

(2%)

TT;

ARAL SUPER 2T; ESSO (EXXON)

0

.90

9,200

3.7

ohms

0.53

0.30

0.40

ohms

Ohms

mm

(.016") air gap, coil to flywheel

(4%)

Sealing compound

b

4

Operating-

A.

Before starting

1.

Refueling

Mixture ratio -please

2.

Engine

Check that cooling fins heating

3.

Air Be sure that

Oil

Check oil level, refill

4.

Starting

4.1

Cold engine Shift throttle lever into Depress tickler until fuel emerges from carburettor. Pull recoil starter firmly until engine starts. slowly return starter handle. again. governor automatically maintains the engine speed.

4.2.

Warm engine Same as not start.

5.

Stopping

5.1

For

Shift throttle lever

5.2

For longer breaks: Close fuel tap shift throttle lever

and

Maintenance

see

of

the engine.

filter:

bath

all

filter connections (clamps) are tight.

filter:

As

soon as engine runs, open starter throttle fully in direction of arrow. The

4.1,

but do not depress tickler Close starter throttle

of

if

necessary.

'RUN'

Instructions

Technical Data

cylinder and

position. Open fuel tap Close starter throttle

air

holes are free from dirt to prevent over-

If

engine does not start. depress tickler

short breaks:

"STOP".

if

engine does

flyball

B.

Service

Bolts

Check tightness, retighten if necessary

Ignition

Chock

Spark

Check Remove deposits or replace plug if necessary

Carburetor

Clean carburettor and fuel Exhaust

Check Clean if necessary eventually burn out

Piston, combustion chamber, and cylinder transfer Clean from carbon deposits

Mechanical

Corrosion

Use

and

and nuts and

breaker

plug

spark

plug

for

carbon deposits.

flyball

50

cm

JLO

Maintenance

Servicing

Work

other

connections

point gap and

gap

governor maintanance

Corroilte

ignition

and adjust if necessary

filter.

also

ports

for

engines

to

be

M,

order no.

timing

tank if necessary

temporarilly

002.75.001.000,

stored

and observe the instruction included.

5

free

C

Additional Instructions

1.

Alr

Intake

filter

Keep dust and dirt out of the engine to avoid premature wear. sty or

dirty

1.1 Paper element filter: Blow out with air against normal direction very dirty cartridges.

1.2 Oil bath filter: Change oil (filling qty. 160- 180 cm³ SAE

D.

General Trouble Shooting

environment, the air filter may have to be cleaned in short intervals.

30)

and observe indicated mark!

If

engineisoperated lndu-

of

airflow. Replace wet or

Possible cause:

1.

Englne does not start

1.1 Fuel tap closed

1.2

No

fuel in tank

1.3 Clogged fuel filter in carburettor or

tap

of

fuel tank or fuel hose

1.4 Engine over-choked (flooded)

1.5 Spark plug fouled

1.6 Main carburettor jet plugged

1.7 Dirty carburettor

1.8 Spark plug cap loose or damaged

2

Engine runs unevenly

2.1 See 1.5-1.8 See above

2.2 Loose spark plug Tighten spark plug

3.

Engine does

3.1 See 1.5 and 1.6 See above

3.2 Choke still closed Open choke

3.3

Dirt in fuel filter and hoses Clean

3.4 Dirty aircleaner or main jet Clean

3.5 Exhaust and/or exhaust port in

cylinder clogged Remove carbon deposits

3.6 Bowdencable misadjustment Adjust properly

or

ignition cable

not

produce

or

ceases to

full

Remedy:

Open fuel tap

Fill

tank with clean, fresh fuel/oil mixture

Clean filter, blow out dirt Close fuel tap. Start engine several times.

Remove spark plug, clean and dry it. If necessary, crank engine without spark plug.

Clean and regap spark plug. Replace if necessary. (Plug type see A Technical Data)

Clean Clean

Retighten, resp. replace

fire

power

All

other failures which

Improper repairing can cause damages and

CAUTION

Carriers

ignition system.

of

cardiac pacemakers should avoid touching current carrying parts

always

require

be

taken

Use genuine

partial

care

or

complete dismantling

of

by an approved service shop.

JLO

spare

lifts

the

parts only.

claim

6

of

the engine should

to guarantee.

of

the

Assembly

group1

RECO I L

DISASSEMBLY

1.1. 1 Pull knot (1a) out

ASSEMBLY

NOTE: Note required direction of rotation. See illustration III. Old recoil spring (only if removed from housing during disassembly):

1.2. 1 Wind recoil spring (4) into housing

New recoil spring - prewound:

If the recoil starter has been properly assembled, the pawl rope is pulled.

STARTER

of

handle

2

Allow rope

3

Remove nut

4

To

prevent. the recoil spring from uncoiling (see illustration II), rotate rope pulley (10) back and forth to disengage inner spring eye and carefully lift out of housing

5

Remove rope (1) from rope pulley (10).

NOTE

:

Recoil

6

To

remove spring (4), take housing

housing

7

Clean and inspect all parts for damage and wear, and replace if necessary.

2

Lubricate recoil spring (4) and rope pulley shaft (12) with some multi- purpose grease.

Place recoil spring (4) in housing

3

housing (7). Remove retaining wire with snipe nosed pliers.

4

The outer spring eye (4b) must be properly hooked around the retaining tab

(illustration III).

The clearance required between inner spring eye (4a) and rope pulley shaft must

5

be approx. 4 Lubricate recoil spring (4) and rope pulley shaft with some multi-purpose

6

grease.

7

Fit rope pulley (10) and carefully rotate it back and forth until it engages in the inner spring eye (4a).

8

Install parts no. 8,9,6,5, and 3 (illustration I).

9

Fit long end of torsion spring over pawl guide (11) (illustration IV).

10

Slip pawl end of torsion spring

11

Fit brake spring brake spring ends (6a) in relation to flat on one side Position rope pulley (10) in relation to flat on pulley shaft (12) as shown in

illustr. V (arrow). Install brake disk shaft (12). Flat in brake disk must match flat on pulley shaft. Fit hex. nut

and torque to 6 Nm (4.4 ft/lbs). Rotate rope pulley (10) against the recoil spring tension until it is tight and

12

hold firm (illustration VI). Let rope pulley

13

rope guide in housing (7a) are in line. Slide rope (1) through hole in rope pulley (10a) and then through the rope guide

14

in the housing (7a).

Slide rope (1) through handle

15

(1)

to retract slowly.

(3)

and parts

(7).

spring (4) need not be removed from housing

(7)

on work bench or other flat surface. Spring will drop out.

mm

(.160 in.). If necessary, rebend spring eye (4a) (ill. III).

(9)

with smooth surface pointing upwards over pawl guide (11). Short

(8)

(6)

to brake disk

(10)

now rotate backwards until hole in rope pulley (10a) and

(2)

and untie.

(5,6,8,9)

must fit into groove of pawl (9a) (illustration

-

(illustration I).

(7)

unless it is broken.

(7)

in both hands, open side down, and hit

(7).

See illustration II.

(7)

and push with screwdriver down into

(8)

into hole of rope pulley (10), pushing it

(5)

as shown in illustr.

(5)

with brake spring

(2)

and tie knot. Slowly return handle.

(9)

V.

Note position

of

brake disk (arrow).

(6)

must move outward when

V).

of

onto pulley

(3)

5

I

6

I

le

7

2

11

10

6a

Oa