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Tecumseh SPECTRA 37 - User Manual

Tecumseh SPECTRA 37
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2
BH 37 E-45040E SER 5 174 C
A. FOREWORD
This manual contains information required to service or
repair all Tecumseh Italian built engines.
For exploded views of particular engines or component
part numbers, refer to the Tecnamotor and Tecumseh
Europa Spare Parts Catalogue.
When ordering spares from your authorized Tecumseh
Dealer, please quote the entire model and specification
number. These numbers are stamped on the engine as
shown below.
Always insist on genuine Tecumseh replacement parts.
ENGINE CODE
SPECTRA 37 E-38000 SER 5 174 A
MODELLO
SPECIFICA
NUMERO DI SERIE
ANNO DI COSTR.
GIORNO DI COSTR.
TURNO
BH 37 E-45040E SER 5 074 C
MODELLO
SPECIFICA
NUMERO DI SERIE
ANNO DI COSTR.
GIORNO DI COSTR.
TURNO
MV 100 S E-16000C SER 5 074 C
MODELLO
SPECIFICA
NUMERO DI SERIE
ANNO DI COSTR.
GIORNO DI COSTR.
TURNO
SPECTRA 37 E-38000 SER 5 174 A
MV 100 S E-16000C SER 5 174 C
S
S
S
S
S
S
174
174
www.mymowerparts.com
For Discount Tecumseh Engine Parts Call 606-678-9623 or 606-561-4983

Table of Contents

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Summary

A. FOREWORD

SERVICE BULLETIN

B. CHECK-UP BEFORE REPAIR

1. GENERAL

General checks before starting engine repair procedures.

2. RECOIL STARTER (CHOKE)

Procedure for starting engine using the recoil starter with choke.

RECOIL STARTER (PRIMER)

Procedure for starting engine using the recoil starter with primer.

3. CHECK-UP

Systematic check for engine faults.

b) COMPRESSION

Checking engine compression for potential issues.

c) IGNITION

Troubleshooting engine ignition system faults.

d) CARBURATION

Diagnosing and resolving fuel system issues.

e) EQUIPMENT

Identifying faults originating from machine equipment.

C. STARTER

1. RECOIL STARTER

Disassembly and assembly of recoil starter.

2. SIDE MOUNTED STARTER HORIZONTAL ENGAGEMENT TYPE (LAV, BV)

Details of side mounted horizontal engagement starter.

3. SIDE MOUNTED STARTER VERTICAL ENGAGEMENT USA TYPE

Disassembly and assembly of vertical engagement starter.

4. A - STYLIZED RECOIL STARTER

Procedure for stylized recoil starter disassembly.

B - INTEGRAL RECOIL STARTER

Procedure for integral recoil starter disassembly.

C - STYLISED STARTER WITH PLASTIC WEDGE (Fig. 28-C)

Disassembly/reassembly for plastic wedge starter.

5. 12 VOLT ELECTRIC START SYSTEM

a) BATTERY

Battery checks and maintenance instructions.

b) ALTERNATOR

Alternator function, air gap setting and testing.

c) STARTER MOTOR TROUBLESHOOTING

Troubleshooting guide for starter motor issues.

D. FLYWHEEL BRAKE SYSTEM

E. IGNITION SYSTEM

3. IGNITION TIMING

Procedures for setting ignition timing.

4. SOLID STATE IGNITION SYSTEM (CDI)

Operation and air gap settings for CDI ignition.

4 A. GROUND TO GO IGNITION UNIT (FLYMO MV100 S)

5. SPARK PLUG (Fig. 26)

Spark plug inspection, replacement and gap setting.

4-STROKE ENGINE SPARK ADVANCE WITH SPARK IGNITION

2-STROKE ENGINE SPARK ADVANCE

F. AIR FILTERS

1. POLYURETHANE TYPE AIR CLEANER

Maintenance for polyurethane foam air cleaner element.

2. MUFFLER ON POLYURETHANE AIR CLEANER

Disassembly and maintenance of intake muffler.

3. POLYURETHANE AIR CLEANER WITH SNORKEL

Service for snorkel type pre-cleaner assembly.

4. CLEAN.ASP.AIR

Maintenance for Clean-Asp-Air filter systems.

5. OIL BATH FILTER (Fig. 9)

Servicing procedures for oil bath air filter.

6. AIR CLEANER FOR FLYMO

Maintenance instructions for Flymo turbo air filter.

7. DUAL POLYURETHANE AIR CLEANER WITH SNORKEL (Fig. 11)

Service for dual polyurethane filter with snorkel.

8. DUAL DRY TYPE PAPER ELEMENT

Maintenance for dual dry type paper element air cleaner.

9. AIR CLEANER WITH AIR INTAKE FROM THE BLOWER HOUSING

Procedure for air cleaner with blower housing intake.

10. AIR CLEANER INVERTED FLUX FOAM TYPE

Check procedure and foam replacement for inverted flux type.

11. CONICAL AIR CLEANER

Replacement procedure for conical air cleaner cartridge.

12. PAPER AIR CLEANER WITH INTAKE FROM THE BLOWER HOUSING

Maintenance for paper air cleaner with blower intake.

G. CARBURETTORS

1. GENERAL

Overview of diaphragm and float carburettor types.

2. DIAPHRAGM CARBURETTOR

Adjustment procedures for diaphragm carburettors.

3. FLOAT STYLE CARBURETTORS

Adjustment procedures for float style carburettors.

H. GOVERNORS

1. PNEUMATIC GOVERNOR FOR 2 STROKES

Description and adjustment of pneumatic governors.

c) GOVERNORS FOR AV AND MV MODELS

Speed adjustment for AV and MV model governors.

2. MECHANICAL GOVERNORS FOR FOUR STROKE ENGINES

Description of centrifugal governors for 4-stroke engines.

4. GOVERNOR LINKAGE FOR HBP;G AND BHG ENGINES

Governor linkage adjustments for specific engine models.

5. GOVERNOR LINKAGE FOR FOUR STROKE ENGINES WITH VERTICAL CRANKSHAFT

Governor linkage for vertical crankshaft engines.

d) NEW GOVERNOR LEVER AND CLAMP

New governor lever and clamp specifications.

e) GOVERNOR;PLATE FOR PRIMER CARBURETTOR

Governor plate adjustments for primer carburettors.

I. TWO-STROKE MECHANICAL ENGINE PARTS

1. UNIBLOCK ENGINES (AV520-600-750-125)

Introduction to uniblock engine components.

b) EXTERNAL INSPECTION REED PLATE

Inspection and replacement of reed plate.

2. MONO BLOCK ENGINES - MV100 S

General information on Mono Block MV100S engines.

b) REMOVAL OF FLYWHEEL

Correct procedure for flywheel removal.

c) ENGINE BLOCK DISASSEMBLY

Steps for disassembling the engine block.

d) REMOVAL AND REFITTING OF CONNECTING ROD & PISTON ASSEMBLY

Procedure for connecting rod and piston assembly.

e) REMOVAL AND REFITTING OF CRANKSHAFT (INCLUDING BALL BEARING)

Crankshaft and ball bearing removal/refitting.

f) SHROUD BASE REASSEMBLY

Instructions for reassembling the shroud base.

3. ALTERNATIVE VERSIONS (AV85 S, EARLIER MV100 S).

Details on alternative engine versions.

L. MECHANICAL PARTS OF 4 STROKE ENGINES

1. GENERAL

General construction overview of 4-stroke engines.

2. COMPRESSION CHECK

Procedure for checking engine compression.

3. VALVES

Inspection, lapping, and servicing of valves and seats.

4. DISASSEMBLING CYLINDER, PISTON AND RINGS

Steps for cylinder, piston, and rings disassembly.

b) ENGINES HTB-HCB-HSB-HBP-BH WITH BALL BEARING ON PTO

Removal procedures for PTO ball bearing engines.

5. INTERNAL INSPECTION

Internal engine component wear inspection.

d) CONNECTING RODS (Fig. 17)

Types and assembly of connecting rods.

e) PISTON RINGS AND PIN

Piston ring and pin inspection and installation.

f) CAMSHAFT

Camshaft inspection and compression release system.

g) LUBRICATION

Lubrication systems for vertical and horizontal engines.

h) MECHANICAL GOVERNOR

Standard mechanical governor components and service.

i) CRANK CASE BREATHER

Crankcase breather operation and maintenance.

k) TOP MOUNTED BREATHER

Maintenance for top mounted breather systems.

l) OIL SEAL REPLACEMENT (Fig 41)

Procedure for oil seal replacement.

6. REASSEMBLY

a) GENERAL

General reassembly sequence and oil seal fitting.

b) CYLINDER

Cylinder and bearing installation procedures.

c) OVERSIZED PISTONS FOR 4-STROKE ENGINES

Identification and fitting of oversized pistons.

d) PISTON AND RINGS

Piston and ring fitting and inspection.

e) PISTON AND CONNECTING ROD (FIG 49)

Piston and connecting rod assembly procedures.

f) CAMSHAFT - OIL PUMP - COVER

Camshaft, oil pump and cover reassembly steps.

g) MOUNTING FLANGE FOR ENGINES WITH LATERAL PTO

7. OHV ENGINES

Introduction to OHV engine valve train service.

a) OH Valve Train Service (Fig 58)

Service procedures for OHV engine valve train.

VALVE TRAIN SERVICE

Detailed steps for valve train disassembly and reassembly.

SETTING THE VALVE LASH

Procedure for setting valve lash on OVRM engine.

b) VALVE SERVICE

Cleaning, grinding, and servicing valve seats.

4-STROKE ENGINE SPECIFICATIONS

4-STROKE ENGINE CLOSING TORQUES

M. TROUBLESHOOTING

EQUIPMENT TROUBLE

Troubleshooting guide for machine equipment issues.

ENGINE - POWER SUPPLY UNIT TROUBLE

Troubleshooting fuel and power supply unit issues.

TROUBLE CAUSED BY ENGINE - IGNITION UNIT

Troubleshooting engine ignition system problems.

TROUBLE CAUSED BY ENGINE - ELECTRIC STARTER UNIT

Troubleshooting electric starter unit issues.

TROUBLE CAUSED BY ENGINE - MONOBLOCK ENGINE UNIT

Troubleshooting monoblock engine unit issues.

WARRANTY POLICY

SPECIAL TOOLS

Tecumseh SPECTRA 37 Specifications

General IconGeneral
BrandTecumseh
ModelSPECTRA 37
CategoryEngine
LanguageEnglish

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