Can’t find your part?   Contact us:
+1-309-603-4777
Sears Parts Direct
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 # BG-MS3270A Official Onan engine

Here are the diagrams and repair parts for Official Onan BG-MS3270A 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 267 parts  |
Element 140-1216
#13

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 | 
17% OFF Phone Price : $30.09
In Stock
Pre-clner 140-1259
#20

Fuel system diagram

Pre-clner

Part #140-1259

Replaced by #45-083-01-S

?
Manufacturer substitution
This part replaces 140-1259. Substitute parts can look different from the original.
This item is not returnable
$7.29 | 
12% OFF Phone Price : $8.29
In Stock
Lock 5/16" - Code 21bj, 21bk, 21bw 850-0045
Lock 5/16" - code 21bj, 21bk, 21bw

Part #850-0045

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

Flat Washer 526-0122
#29

Cylinder block diagram

Flat washer

Part #526-0122

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

Washer 526-0113
#29

Governor, starter charging alternator & blower housing grp. diagram

Washer

Part #526-0113

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

Flat Washer 526-0018
#5

Cylinder block diagram

Flat washer

Part #526-0018

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

Flat Washer 526-0214
#28

Governor, starter charging alternator & blower housing grp. diagram

Flat washer

Part #526-0214

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

Control Rod 150-1350
#1

Governor, starter charging alternator & blower housing grp. diagram

Control rod

Part #150-1350

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

Rod 114-0247-10
#14B

Crankshaft, flywheel, camshaft and piston group diagram

Rod

Part #114-0247-10

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

Cap 191-1037
#9

Starter parts group diagram

Cap

Part #191-1037

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