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 # B48M-GA018 Official Onan gas engine

Here are the diagrams and repair parts for Official Onan B48M-GA018 gas 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 263 parts  |
Element 140-1216
#4

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 | 
19% OFF Phone Price : $31.09
In Stock
Plug 167-0298
#9

Ignition diagram

Plug

Part #167-0298

Replaced by #857

?
Manufacturer substitution
This part replaces 167-0298. Substitute parts can look different from the original.
This item is not returnable
$6.46
In Stock
Filter 122-0338
#15

Oil system diagram

Filter

Part #122-0338

Replaced by #52-050-02-S1

?
Manufacturer substitution
This part replaces 122-0338. Substitute parts can look different from the original.
$14.67 | 
12% OFF Phone Price : $16.67
In Stock
Gear Cam 105-0332
#7

Camshaft diagram

Gear cam

Part #105-0332

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

Screw 191-1048
#12

Starter motor parts diagram

Screw

Part #191-1048

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

Bearing 115-0006-05
#27C

Cylinder block diagram

Bearing

Part #115-0006-05

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

Crankshaft Gear 104-0032
#12

Crankshaft and flywheel diagram

Crankshaft gear

Part #104-0032

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

Tube 149-1299
#13

Gearcase diagram

Tube

Part #149-1299

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

Choke Shaft 142-0536
#5

Carburetor (with integral fuel pump) parts diagram

Choke shaft

Part #142-0536

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

Float Lever 142-0548
#21

Carburetor (with integral fuel pump) parts diagram

Float lever

Part #142-0548

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

Repair guides for front-engine lawn tractors

How to replace a ground drive belt on a riding lawn mower

How to replace a ground drive belt on a riding lawn mower

Replace the ground drive belt if it's broken or too worn to spin the transaxle pulley.…

Read more
Repair difficulty
Time required
 45 minutes or less
How to replace a blade clutch cable on a riding lawn mower

How to replace a blade clutch cable on a riding lawn mower

If the blades don't spin on your riding mower when you shift the lever, the blade clutch cable could be broken. Here’s h…

Read more
Repair difficulty
Time required
 30 minutes or less
How to replace a riding lawn mower blade drive belt

How to replace a riding lawn mower blade drive belt

Replace the blade drive belt if it's broken or won't spin the cutting blades because of wear.…

Read more
Repair difficulty
Time required
 45 minutes or less

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