Briggs & Stratton 083100 User manual

Foreword

This manual was written to assist engine technicians and service personnel with the repair and maintenance

procedures for Briggs & Stratton® engines. It assumes that persons using this manual have been properly

trained in and are familiar with the servicing procedures for these products, including the proper use of

required tools and safety equipment and the application of appropriate safety practices. Persons untrained

or unfamiliar with these procedures or products should not attempt to perform such work.

Proper maintenance and repair is important to safe, reliable operation of all engines and engine-driven

systems. The troubleshooting, testing, maintenance, and repair procedures described in this manual are

appropriate for the Briggs & Stratton engines described herein. Alternative methods or procedures may pose

risk to personal safety and the safety and/or reliability of the engine and are not endorsed or recommended

by Briggs & Stratton.

All information, illustrations, and specifications contained in this manual were based on the data available

at the time of publication. Briggs & Stratton Corporation reserves the right to change, alter, or otherwise

improve the product or the product manuals at any time without prior notice.

Briggs & Stratton offers two complementary publications to enhance understanding of engine technology,

maintenance, and repair. (Neither publication, however, is a substitution for a recognized training program

for engine technicians.)

•For consumers,

Small Engine and Equipment Maintenance Guide

(p/n CE8155) provides a comprehensive

overview of how small air-cooled engines work, basic troubleshooting, and step-by-step maintenance

procedures.

• For engine technicians and consumers alike, an in-depth study of engine theory and operation can be

found in the textbook

Small Engines

(p/n CE8020).

Both publications can be purchased at BRIGGSandSTRATTON.COM or through a local Briggs & Stratton

Authorized Service Dealer.

No part of this manual may be reproduced or transmitted in any form or by any means, electronic or

mechanical, including photocopying or recording by any information storage and retrieval system, without

prior written permission from Briggs & Stratton Corporation.

This engine repair manual includes the following engine model:

• MODEL 083100

SECTION 1 – GENERAL INFORMATION

SECTION 2 – SAFETY, MAINTENANCE AND ADJUSTMENTS

SECTION 3 – TROUBLESHOOTING

SECTION 4 – FUEL SYSTEM AND CARBURETION

SECTION 5 – CONTROLS AND GOVERNOR SYSTEM

SECTION 6 – LUBRICATION SYSTEM

SECTION 7 – CYLINDER HEAD AND VALVES

SECTION 8 – PISTON, RINGS AND CONNECTING ROD

SECTION 9 – CRANKSHAFT, CAMSHAFT AND FLYWHEEL

SECTION 10 – CYLINDER AND CRANKCASE COVER

SECTION 11 – GEAR REDUCTION UNIT

SECTION 12 – STARTER

SECTION 13 – EXHAUST SYSTEM

SECTION 14 – ENGINE SPECIFICATIONS

SECTION 1 – GENERAL INFORMATION

GENERAL INFORMATION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4

Engine Identification - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4

Acronyms, Abbreviations and Meanings - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4

Order of Engine Assembly and Disassembly - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4

GENERAL INFORMATION

Engine Identification

Engine identification is located as shown (A).

Acronyms, Abbreviations and Meanings

MeaningAcronyms and

Abbreviations

Bottom Dead CenterBDC

Before Top Dead CenterBTDC

MagnetoMAG

Part Numberp/n

Power Take-OffPTO

Revolutions Per MinuteRPM

Top Dead CenterTDC

Top No-LoadTNL

Order of Engine Assembly and Disassembly

Section ProcedureSection

Number

Order of Disassembly

Change Oil2Drain oil

Service Spark Plug2Spark Plug

Change Air Filter2Air cleaner assembly

Section ProcedureSection

Number

Order of Disassembly

Remove Control Bracket5Control panel trim

Remove Control Bracket5Governor control bracket

Remove Control Bracket5Air cleaner base

Remove Carburetor4Carburetor

Disassemble Carburetor4Disassemble carburetor

Remove Fuel Tank4Fuel tank

Remove Rewind Starter12Rewind starter

Adjust Armature Air Gap2Blower housing

Remove Muffler13Exhaust manifold

Remove Flywheel9Armature

Remove Flywheel9Flywheel

Remove Breather6Rocker cover / breather

Remove Cylinder Head7Cylinder shield

Disassemble Cylinder Head7Rocker arms

Remove Cylinder Head7Push rods

Remove Cylinder Head7Cylinder head

Disassemble Cylinder Head7Valves, springs and seals

Remove Crankshaft and

Camshaft

9Crankcase cover

Remove PTO Bearing10PTO oil seal

Remove PTO Bearing10PTO bearing

Remove Crankshaft and

Camshaft

9Camshaft and tappets

Remove Piston and

Connecting Rod

8Connecting rod and piston

Remove Crankshaft and

Camshaft

9Crankshaft

Remove MAG Bearing10MAG oil seal

Remove MAG Bearing10MAG bearing

Section ProcedureSection

Number

Order of Assembly

Install MAG Bearing10MAG bearing

Install MAG Bearing10MAG oil seal

Install Crankshaft and

Camshaft

9Crankshaft

Install Piston and Connecting

Rod

8Connecting rod and piston

Install Crankshaft and

Camshaft

9Camshaft and tappets

Install PTO Bearing10PTO bearing

Install PTO Bearing10PTO oil seal

Install Crankcase Cover9Crankcase cover

Assemble Cylinder Head7Valves, springs and seals

Install Cylinder Head7Cylinder head

Install Cylinder Head7Push rods

Install Cylinder Head7Rocker arms

4 BRIGGSandSTRATTON.COM

Section ProcedureSection

Number

Order of Assembly

Adjust Valve Clearance2Adjust valve clearance

Install Breather6Rocker cover / breather

Install Cylinder Head7Cylinder shield

Install Flywheel9Flywheel

Install Flywheel9Armature

Adjust Armature Air Gap2Adjust armature air gap

Adjust Armature Air Gap2Blower housing

Install Rewind Starter12Rewind starter

Assemble Carburetor4Assemble carburetor

Install Carburetor4Carburetor

Install Control Bracket5Governor control bracket

Perform Static Governor

Adjustment

2Static governor adjustment

Install Control Bracket5Air cleaner base

Install Fuel Tank4Fuel tank

Install Control Bracket5Control panel trim

Change Air Filter2Air cleaner assembly

Install Muffler13Exhaust manifold

Service Spark Plug2Spark Plug

Change Oil2Fill engine with oil

6 BRIGGSandSTRATTON.COM

SECTION 2 – SAFETY, MAINTENANCE AND ADJUSTMENTS

SAFETY INFORMATION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8

Safety Alert Symbol and Signal Words - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8

Hazard Symbols and Meanings - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8

General Safety Messages - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8

ENGINE MAINTENANCE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 11

Maintenance Schedule - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

Fuel Recommendations - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

High Altitude - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

Oil Recommendations - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

Service Fuel Filter - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

In-Tank Fuel Filter - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

In-Line Fuel Filter - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 13

Change Oil - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 14

Change Air Filter - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 15

Service Spark Plug - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 16

Clean Air Cooling System - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 16

Clean Combustion Chamber - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17

Storage - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17

ENGINE ADJUSTMENTS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17

Adjust Armature Air Gap - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 18

Carburetor - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19

Adjust Idle Speed - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19

Remote Choke and Throttle Controls - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19

Adjust Remote Choke Control - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19

Adjust Remote Throttle Control - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 20

Governor - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 20

Perform Static Governor Adjustment - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 20

Adjust Idle Speed - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 21

Adjust Top No-Load Speed - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 21

Combustion Chamber - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 21

Adjust Valve Clearance - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 21

SAFETY INFORMATION

This repair manual contains safety information that is

designed to:

• Make you aware of hazards associated with engines.

• Inform you of the risk of injury associated with those

hazards.

• Instruct you how to avoid or reduce the risk of injury.

Safety Alert Symbol and Signal Words

The safety alert symbol indicates a potential personal

injury hazard. A signal word (DANGER,WARNING, or

CAUTION) is used with the alert symbol to designate a

degree or level of hazard seriousness. A safety symbol may

be used to represent the type of hazard. The signal word

NOTICE

is used to address practices not related to personal

injury.

DANGER indicates a hazard which, if not avoided,

will

result in death or serious injury.

WARNING indicates a hazard which, if not avoided,

could

result in death or serious injury.

CAUTION indicates a hazard which, if not avoided,

could

result in minor or moderate injury.

NOTICE

addresses practices not related to personal injury.

Hazard Symbols and Meanings

MeaningSymbolMeaningSymbol

Read and understand the

Operator's Manual before

operating or servicing the

unit.

Safety information

about hazards that can

result in personal

injury.

Explosion hazardFire hazard

Explosion hazardShock hazard

Toxic fume hazardHot surface hazard

Chemical hazardAmputation hazard -

moving parts

MeaningSymbolMeaningSymbol

Thrown object hazard -

wear eye protection

Kickback hazard

Amputation hazard -

entanglement

General Safety Messages

Prior to work, read and understand the section(s) of this

manual that pertain to the job. Follow all safety warnings.

• Always use fresh gasoline. Stale fuel can cause gum

deposits in the carburetor and cause leakage, flow

restrictions, or other problems.

• Check fuel lines and fittings frequently for cracks or

leaks and replace if necessary.

WARNING

Before attempting to service this equipment, read and

understand this manual and the operating instructions of

the engine and the equipment.

WARNING

Failure to follow instructions could result in serious injury

(including paralysis) and even death.

WARNING

Battery post, terminals, and related accessories contain

lead and lead compounds - chemicals known to the State

of California to cause cancer and reproductive harm. Wash

hands after handling.

WARNING

Certain components in this product and its related

accessories contain chemicals known to the State of

California to cause cancer, birth defects, or other

reproductive harm. Wash hands after handling.

8 BRIGGSandSTRATTON.COM

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