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Product Description
?This is an authentic replacement part manufactured for use with small engines. Seals can deteriorate overtime, and it is recommended to replace worn seals when servicing an engine. This seal is the lower seal in the engine's sump, the seal is sold individually.
Frequently Purchased Together
?Troubleshooting
- Briggs and Stratton
- Toro
- Lawn Boy
- Craftsman
- MTD
- Poulan
- Simplicity
- Engine
- Lawn Mower
- Pressure Washer
- Generator
Customer Part Reviews
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Questions & Answers
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Hello Russel, Thank you for your inquiry. There are several things that can cause this issue: oil leaking into the combustion chamber, so check the oil seals for warped or missing gaskets. You also want to check for proper combustion as incomplete combustion can cause carbon buildup. Incomplete combustion can be caused by idling the engine more than you run it at full speed, or the carburetor spraying too much fuel into the combustion chamber, so it burns cooler and causes a lot of smoke that fouls the plug and air filters. Good luck with your repair.
Customer Repair Instructions
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
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Leaking lower crankshaft seal.
Robert from Ridgway, Pennsylvania
- Difficulty Level:
- Easy
- Total Repair Time:
- 30 - 60 mins
- Tools:
- Screw drivers, Socket set
very little compression ex. valve leaked
Hans from ARLINGTON, Texas
- Difficulty Level:
- Difficult
- Total Repair Time:
- More than 2 hours
- Tools:
- Nutdriver, Pliers, Screw drivers, Socket set, Wrench set
honed the cylinder, regrind both valves
reassembled all parts by changing out all ordered parts.
Seal leaking at out put shaft,letting oil drain out and locked the motor up.
joseph from charles town, West Virginia
- Difficulty Level:
- A Bit Difficult
- Total Repair Time:
- 1- 2 hours
- Tools:
- Pliers, Screw drivers, Socket set, Wrench (Adjustable), Wrench set
bottom oil seal leaking
Paul from Brookpark, Ohio
- Difficulty Level:
- A Bit Difficult
- Total Repair Time:
- 15 - 30 mins
- Tools:
- Screw drivers
- Parts Used:
- 399781S
2 drained oil
3 removed blade
4 had a hard time when I was removing blade hub had to heat up and pry off took some time
5 popped out leaky oil seal on engine bottom pan
6 cleaned shaft and oil from housing
7 installed new oil seal
Leaking oil from crankcase
Steven from Olean, New York
Bent crankshaft
Kevin from Bluff City, Tennessee
- Difficulty Level:
- A Bit Difficult
- Total Repair Time:
- 30 - 60 mins
- Tools:
- Nutdriver, Screw drivers, Socket set, Wrench set
Removed gas tank
Removed engine flywheel cover
Removed spark plug
Removed flywheel
Removed crankcase cover
Removed governor assembly and cam shaft
Disconnected piston rod end cap and pushed piston forward to clear path for crankshaft removal
Removed cranked sh ... Read more aft
Cleaned all parts and engine crankcase
Replaced crankshaft lower seal
Oiled all parts during reassembled in reverse order. Torqued all bolts to spec.
Reinstalled engine onto mower, new oil, fresh gas and mowed the yard!
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Model Cross Reference
Manufacturer Part Number: 399781S
| Brand | Model Number | Description |
|---|---|---|
| Briggs and Stratton | 01050-0 | Pressure Washer - Briggs & Stratton Pressure Washer Model 01050-0 (010500, 01050 0) Parts |
| Briggs and Stratton | 01052-0 | Pressure Washer - Briggs & Stratton Pressure Washer Model 01052-0 (010520, 01052 0) Parts |
| Briggs and Stratton | 01052-1 | Pressure Washer - Briggs & Stratton Pressure Washer Model 01052-1 (010521, 01052 1) Parts |
| Briggs and Stratton | 01053-0 | Pressure Washer - Briggs & Stratton Pressure Washer Model 01053-0 (010530, 01053 0) Parts |
| Briggs and Stratton | 01133-0 | Generator - Briggs & Stratton Generator Model 01133-0 (011330, 01133 0) Parts |
| Briggs and Stratton | 01282-0 | Pressure Washer - Briggs & Stratton Pressure Washer Model 01282-0 (012820, 01282 0) Parts |
| Briggs and Stratton | 01433-0 | Pressure Washer - Briggs & Stratton Pressure Washer Model 01433-0 (014330, 01433 0) Parts |
| Briggs and Stratton | 01433-1 | Pressure Washer - Briggs & Stratton Pressure Washer Model 01433-1 (014331, 01433 1) Parts |
| Briggs and Stratton | 01433-2 | Pressure Washer - Briggs & Stratton Pressure Washer Model 01433-2 (014332, 01433 2) Parts |
| Briggs and Stratton | 020733-00 | Pressure Washer - Gas Power Washer |
| Briggs and Stratton | 021022-00 | Pressure Washer - Gas Power Washer |
| Briggs and Stratton | 021027-00 | Pressure Washer - Gas Power Washer |
| Craftsman | 0505-0-580741380 | Pressure Washer - 0505-0 - 580.741380, 1,500 Psi (Rev 3 5/20/96) Craftsman |
| Briggs and Stratton | 0647-0 | Generator - 2,000 Watt Portable Generator |
| Craftsman | 0647-0-580327700 | Generator - 0647-0 - 580.327700, 2,000 Watt Craftsman |
| Craftsman | 0764-0-580762250 | Pressure Washer - 0764-0 - 580.762250, 2,250 Psi Craftsman |
| Briggs and Stratton | 0795-0 | Pressure Washer - Briggs & Stratton Pressure Washer Model 0795-0 (07950, 0795 0) Parts |
| Craftsman | 0795-0-580677220 | Pressure Washer - 0795-0 - 580.677220, 2,250 Psi Craftsman |
| Briggs and Stratton | 090602-0111-B8 | Engine - Engine |
| Briggs and Stratton | 090602-0112-B8 | Engine - Engine |
| Briggs and Stratton | 090602-0112-H8 | Engine - Engine |
| Briggs and Stratton | 090602-0113-B8 | Engine - Engine |
| Briggs and Stratton | 090602-3112-H8 | Engine - Engine |
| Briggs and Stratton | 090602-3113-H8 | Engine - Engine |
| Briggs and Stratton | 092J0B | Engine - Briggs & Stratton Small Engine Model 092J0B/0001-H1 (092J0B/0001H1, 092J0B/0001 H1) Parts |
| Briggs and Stratton | 092J0B-0001-H5 | Engine - Engine |
| Briggs and Stratton | 092J0B-0002-H5 | Engine - Engine |
| Briggs and Stratton | 092J0B-0004-H5 | Engine - Engine |
| Briggs and Stratton | 092J0B-0005-H5 | Engine - Engine |
| Briggs and Stratton | 092J0B-0006-H5 | Engine - Engine |
Some of the parts we sell are eligible for mail-in rebates since we can recycle them. We will display any applicable rebates in your shopping cart. To redeem your rebate, contact Customer Service after you have received your part.