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Onan
Lawn & Garden Engine

Model # B43M-GA016 Official Onan engine

Here are the diagrams and repair parts for Official Onan B43M-GA016 engine, as well as links to manuals and error code tables, if available.

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Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

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Model diagram and schematic

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ALL PARTS
Showing 10 of 277 parts  |
Element 140-1216
#4

Fuel system diagram

Element

Part #140-1216

Replaced by #45-083-02-S

?
Manufacturer substitution
This part replaces 140-1216. Substitute parts can look different from the original.
This item is not returnable
$25.09 | 
19% OFF Phone Price : $31.09
In Stock
Flat Washer 526-0018
#39

Cylinder block diagram

Flat washer

Part #526-0018

Replaced by #STD551025

?
Manufacturer substitution
This part replaces 526-0018. Substitute parts can look different from the original.
This item is not returnable
$2.49 | 
29% OFF Phone Price : $3.49
In Stock
Gasket 142-0541
#12

Carburetor (with integral fuel pump) (142-0660) diagram

Gasket

Part #142-0541

The manufacturer no longer makes this part, and there's no substitute part

Bearing 110-0197-25
#14E

Cylinder block diagram

Bearing

Part #110-0197-25

The manufacturer no longer makes this part, and there's no substitute part

Code 23dz 123-1292
#16

Oil system diagram

Code 23dz

Part #123-1292

The manufacturer no longer makes this part, and there's no substitute part

Lawn & Garden Equipment Engine Internal Ring 518-0311
#3

Piston and rod diagram

Lawn & garden equipment engine internal ring

Part #518-0311

The manufacturer no longer makes this part, and there's no substitute part

Gear Cam 105-0332
#7

Camshaft diagram

Gear cam

Part #105-0332

The manufacturer no longer makes this part, and there's no substitute part

Lawn & Garden Equipment Engine Screw 800-0010
#30

Cylinder block diagram

Lawn & garden equipment engine screw

Part #800-0010

The manufacturer no longer makes this part, and there's no substitute part

Flywheel (includes Ring Gear) For Engines With Magneto Ignition - Recoil Start - Hi Flo 160-1307

#NI

All parts diagram

Flywheel (includes ring gear) for engines with magneto ignition - recoil start - hi flo

Part #160-1307

The manufacturer no longer makes this part, and there's no substitute part

Blower Housing 134-4400
#1B

Air housing diagram

Blower housing

Part #134-4400

The manufacturer no longer makes this part, and there's no substitute part

Symptoms for gas walk-behind mowers

Choose a symptom to see related walk-behind mower repairs.

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Why does my lawn mower vibrate a lot?

Main causes: damaged cutting blade, loose cutting blade, damaged flywheel key, engine needs tune up…

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Why does my lawn mower cut unevenly?

Main causes: uneven wheel height settings, damaged wheel, dull or damaged cutting blade…

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Why does my lawn mower run rough?

Main causes: engine needs tune up, dirty or clogged carburetor, damaged flywheel key…

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Why won't my lawn mower move?

Main causes: drive control cable failure, worn or broken drive belt, bad transmission, broken drive wheel…

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Why won't my lawn mower start?

Main causes: stale gas, engine needs tune up, bad spark plug, dead battery, bad recoil starter, faulty safety switch, ba…

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Why does my lawn mower stall?

Main causes: dirty carburetor, bad spark plug, clogged air filter, engine choke problems, clogged gas cap vent…

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Repair guides for gas walk-behind mowers

These step-by-step repair guides will help you safely fix what’s broken on your walk-behind lawn mower.

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How to rebuild a lawn mower carburetor

How to rebuild a lawn mower carburetor

The carburetor mixes air with fuel to drive the piston. Rebuild the carburetor if it's clogged or leaks.…

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Repair difficulty
Time required
 60 minutes or less
How to replace a lawn mower recoil starter on an OHV engine

How to replace a lawn mower recoil starter on an OHV engine

Replace the recoil starter if it doesn't move when you pull the starter rope.…

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Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower wheel

How to replace a lawn mower wheel

Learn how replace a damaged wheel on a walk-behind lawn mower—it's a quick, easy fix.…

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Repair difficulty
Time required
 15 minutes or less

Effective articles & videos to help repair your lawn & garden engines

Use the advice and tips in these articles and videos to get the most out of your walk-behind lawn mower.

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Top questions about Sears and Sears PartsDirect

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What are the main components of a lawn mower?

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