Tecumseh_quick_reference.pdf

Tecumseh

Quick Reference

Service Information

Covers Engine and Transmission Product

Form No.695933 R 7/00

Introduction

This booklet contains the quick reference and basic trouble-

shooting information previously found on Tecumseh wall charts

and in the Technician's Handbooks.

This booklet is designed to be used as a work bench quick

reference guide when servicing Tecumseh engines and motion

drive systems.

Technician's Note:

Tecumseh engines are manufactured to meet EPA and CARB

standards. As a technician, it is unlawful to re-calibrate or replace

a fuel nozzle or jet (bowl nut) with a part from any other carburetor

that was not originally designed for that engine. All speed adjust-

ments must remain within the limits that are specified for each

engine and are not to exceed the maximum. This can only be

deviated from if specifically approved by Tecumseh Products,

EPA and CARB.

Note: Torque specifications listed should not be confused with the torque value observed on

engines which have been run.

The Torque specifications take relaxation into account so sufficient clamping force exists

after an engine has reached operating temperature.

Torques listed are intended to cover highly critical areas. More extensive torques are found

in the respective repair manual.

Torque Specifications

TWO-CYCLE ENGINE SERIES

840 - 850 TWO-CYCLE ENGINE SERIES

Location

Inch lbs. Torque

Engine Designation

Crankcase to Cylinder

120-204

13.5-23

• • • •

Flywheel Nut

360-420

41-47.5

• •

Adapter Plate to Cylinder

160-220

18-25

TC TWO-CYCLE ENGINE SERIES

Location

Inch lbs. Torque Nm Engine Designation

Cylinder to Crankcase

80-95

9-11

• • •

Crankcase Cover to Crankcase

70-100

8-11

• • •

Flywheel Nut

190-250

21.5-28.5

TWO-CYCLE ENGINE SERIES (AV520/600, TVS600, AH520, AH/HSK600)

Location

Inch lbs. Torque Nm

Engine Designation

Connecting Rod

40-50

4.5-5.5

• • • •

Housing Base to Cylinder

80-120

9-13.5

• • • •

Cylinder Head to Cylinder

100-140

11-16

•

Flywheel Nut AV Industrial (Point Ignition) 216-300

24.5-34

(670 Series AV 520 and All AV 600)

Flywheel Nut (C.D. Ignition)

264-324

30-36.5

• • • •

• • •

• • • •

Two Cycle Troubleshooting

As an aid in troubleshooting any piece of equipment, interview the customer, and review conditions and

symptoms of the problem. Examine exterior for clues: leaks, excessive dirt, damaged or new parts.

FUEL SYSTEM

Engine Will

Not Start

Wet

Check if spark

plug is wet or dry

Dry

Defective

spark plug

Review with customer

priming or choking

procedure

(3-5 primes, if

equipped, waiting 2

seconds between

each prime)

Restricted

air filter

Improper fuel mix

or stale fuel

Carburetion problem*

(bad bowl gasket)

Exhaust ports

plugged

Check fuel supply

and fuel cap vent

Carburetion

problems due to

flooding, over

priming, etc.*

Restriction in

fuel system (filter,

screen)

Ignition System

Poor

compression

Crankcase seals

or gaskets leaking

Damaged reed, port

plugs, seals or

gaskets

NOTE: Refer to Technician's Handbook for a more

detailed list of remedies.

*Carburetor Troubleshooting use Technician's

Handbook or Carburetor Troubleshooting Booklet,

Form No. 695907. Video No. 695015.

(CONTINUED ON NEXT PAGE)

Two Cycle Troubleshooting - continued

IGNITION SYSTEM

Engine Will

Not Start

Check for spark

Spark

No Spark

Check flywheel for

correct key, damaged

key or key adaptor

Replace spark plug

Set proper air gap on

external coil

Isolate engine from all

equipment (disconnect

wiring harness), repeat

test

Set proper point gap,

check condensor and

timing (if equipped)

Spark

No Spark

Equipment problem,

check switches, wiring

and equipment

controls

Test coil for

intermittent or weak

spark

Engine problem,

check for shorts or

grounds in wiring

Check electric starter

if applicable

Parasitic load too high

Test ignition module

NOTE: Refer to Technician's Handbook for a more detailed list of remedies.

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