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.

There are a couple of ways to find the part or diagram you need:

  • Click a diagram to see the parts shown on that diagram.
  • In the search box below, enter all or part of the part number or the part’s name.

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

We encourage you to save the model to your profile, so it’s easy to access parts and manuals for your appliance whenever you log in.

For DIY troubleshooting advice and repair guides, visit our repair help section.

Model diagram and schematic

SEARCH WITHIN THIS MODEL

?

This is the number corresponding to the part on the diagram / schematic

Search
ALL PARTS
Showing 10 of 123 parts  |

Lock Washer 850-45
#33

Gear cover, oil base, and oil pump group diagram

Lock washer

Part #850-45

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

Screw 806-27
#42

Cylinder block group diagram

Screw

Part #806-27

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

Fl Washer 526-122
#7

Cylinder block group diagram

Fl washer

Part #526-122

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

Lock Nut 870-277
#19

Crankshaft - flywheel, camshaft and piston group diagram

Lock nut

Part #870-277

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

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

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

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

Pin 150-75
#11

Crankshaft - flywheel, camshaft and piston group diagram

Pin

Part #150-75

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

Bearing 101-420-02
#21B

Cylinder block group diagram

Bearing

Part #101-420-02

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

Washer 104-575
#22

Cylinder block group diagram

Washer

Part #104-575

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

Symptoms for gas ranges

Main causes: burner igniter switch failure, bad spark module, dirty or damaged spark electrode, wiring failure…

Main causes: gas supply problem, faulty pressure regulator, clogs in burner or orifice, control system failure, faulty t…

Repair guides for gas ranges

How to replace oven door hinges on a gas range

How to replace oven door hinges on a gas range

See how to replace the oven door hinges on a gas range yourself, in just 30 minutes.…

Repair difficulty
Time required
 15 minutes or less
How to replace a range spark igniter switch

How to replace a range spark igniter switch

Follow these steps to replace the spark igniter switch—sometimes called a burner switch or spark switch—on a gas or dual…

Repair difficulty
Time required
 60 minutes or less
How to replace a range spark igniter electrode

How to replace a range spark igniter electrode

Learn how to replace the spark igniter electrode for the surface burners on a gas range or dual-fuel range.…

Repair difficulty
Time required
 45 minutes or less

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

Top questions about Sears and Sears PartsDirect

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

What are the main components of a lawn mower?

What are the main components of a lawn mower?

Learn about the main parts of a lawn mower and when to replace parts.…