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Onan
Lawn & Garden Engine

Model # BF-MS2379A Official Onan engine

Here are the diagrams and repair parts for Official Onan BF-MS2379A 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 123 parts  |
Fl Washer 526-18
#5

Cylinder block group diagram

Fl washer

Part #526-18

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

Scr Lk Flywh 821-10
#27

Crankshaft - flywheel, camshaft and piston group diagram

Scr lk flywh

Part #821-10

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

Gear Set 105-353
#6

Crankshaft - flywheel, camshaft and piston group diagram

Gear set

Part #105-353

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

Shim 104-776
#15

Cylinder block group diagram

Shim

Part #104-776

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

Nipple 505-2
#21

Gear cover, oil base, and oil pump group diagram

Nipple

Part #505-2

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

Cap Screw 800-7
#31

Gear cover, oil base, and oil pump group diagram

Cap screw

Part #800-7

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

Head Cylindr 110-1924
#17

Cylinder block group diagram

Head cylindr

Part #110-1924

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

Gasket 110-1920
#16

Cylinder block group diagram

Gasket

Part #110-1920

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

Gasket 103-408
#10

Gear cover, oil base, and oil pump group diagram

Gasket

Part #103-408

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

Carburetor 142-0587

#NI

All parts diagram

Carburetor

Part #142-0587

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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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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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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15 minutes or less
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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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Effective articles & videos to help repair your lawn & garden engines

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