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  |

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

Ring 150-78
#1

Crankshaft - flywheel, camshaft and piston group diagram

Ring

Part #150-78

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

Nut 110-445
#28

Cylinder block group diagram

Nut

Part #110-445

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

Cover 122-359
#23

Gear cover, oil base, and oil pump group diagram

Cover

Part #122-359

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

Bearing 101-420
#21A

Cylinder block group diagram

Bearing

Part #101-420

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

Valve 110-1809
#35

Cylinder block group diagram

Valve

Part #110-1809

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

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.…