Can’t find your part?   Contact us:
+1-309-603-4777
Sears Parts Direct
Tips to find your model number
Orders

  • Keep track of the models you own in your profile

    Sign in or Register to view or add models

Schedule a repair
Onan
Lawn & Garden Engine

Model # BF-MS2666C Official Onan engine

Here are the diagrams and repair parts for Official Onan BF-MS2666C 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 236 parts  |
Pre-cleaner 140-1218
#21

Fuel system group diagram

Pre-cleaner

Part #140-1218

Replaced by #45-083-01-S

?
Manufacturer substitution
This part replaces 140-1218. Substitute parts can look different from the original.
This item is not returnable
$7.29 | 
12% OFF Phone Price : $8.29
In Stock
Element 140-1216
#13

Fuel system group 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
Gear 105-0353
#6

Crankshaft, flywheel, camshaft and piston group diagram

Gear

Part #105-0353

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

Armature 191-1039
#11

Starter parts group diagram

Armature

Part #191-1039

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

Scr Br Bx Cr 815-0358
Scr br bx cr

Part #815-0358

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

Screw 191-1048
#9

Starter parts group diagram

Screw

Part #191-1048

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

Key 515-0103
#23

Crankshaft, flywheel, camshaft and piston group diagram

Key

Part #515-0103

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

Pump 120-0491
#19

Gear cover, oil base and oil pump group diagram

Pump

Part #120-0491

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

Washer 191-1038
#8

Starter parts group diagram

Washer

Part #191-1038

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

Nut 191-1045
#2

Starter parts group diagram

Nut

Part #191-1045

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

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

View all
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.…

Read more
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.…

Read more

Parts & More