eReplacementParts.com
877-346-4814
Briggs and Stratton Parts
Preferred Partners of
photo thumbnailphoto thumbnail360 degree photo thumbnail

Seal-Oil

Part Number: 399781S
Briggs and StrattonToroLawn Boy
Availability: 9 in stock
Price: $7.53
Order within the next 5 hours
and your part ships today!

*This part replaces obsolete part #: 399781.

Product Information
Manufacturer: Briggs and Stratton, Toro, Lawn Boy
Product Number: 399781S
Classification: Part
Weight: 0.02 lbs.
Shipping: Ships Worldwide
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 With
Compatibility

This part is compatible with the following machines:

Briggs and Stratton
Toro
16400 (1000001-1999999)(1991) Lawn Mower
16400 (2000001-2999999)(1992) Lawn Mower
16400 (3900001-3999999)(1993) Lawn Mower
16400 (4900001-4999999)(1994) Lawn Mower
16400 (5900001-5999999)(1995) Lawn Mower
16400 (6900001-6999999)(1996) Lawn Mower
16401 (1000001-1999999)(1991) Lawn Mower
16401 (2000001-2999999)(1992) Lawn Mower
16401 (39000001-39999999)(1993) Lawn Mower
16401 (4900001-4999999)(1994) Lawn Mower
16401 (59000001-59999999)(1995) Lawn Mower
16401 (6900001-6999999)(1996) Lawn Mower
16401 (7900001-7999999)(1997) Lawn Mower
16401 (890000001-899999999)(1998) Lawn Mower
16402 (1000001-1999999)(1991) Lawn Mower
16403 (1000001-1999999)(1991) Lawn Mower
16403 (2000001-2999999)(1992) Lawn Mower
16404 (1000001-1999999)(1991) Lawn Mower
16404 (2000001-2999999)(1992) Lawn Mower
20010 (9900001-9999999)(1999) Lawn Mower
20010 (200000001-200999999)(2000) Lawn Mower
20010 (210000001-210999999)(2001) Lawn Mower
20010 (220000001-220999999)(2002) Lawn Mower
20011 (210000001-210999999)(2001) Lawn Mower
20020 (9900001-9999999)(1999) Lawn Mower
20020 (210000001-210999999)(2001) Lawn Mower
20021 (9900001-9999999)(1999) Lawn Mower
20021 (200000001-200999999)(2000) Lawn Mower
20021 (210000001-210999999)(2001) Lawn Mower
20022 (9900001-9999999)(1999) Lawn Mower
20022 (200000001-200999999)(2000) Lawn Mower
20022 (210000001-210999999)(2001) Lawn Mower
20023 (210000001-210999999)(2001) Lawn Mower
20023 (200000001-200999999)(2000) Lawn Mower
20023 (9900001-9999999)(1999) Lawn Mower
20023C (210000001-210999999)(2001) Lawn Mower
20025 (200000001-200999999)(2000) Lawn Mower
20025 (210000001-210999999)(2001) Lawn Mower
20025 (9900001-9999999)(1999) Lawn Mower
20027 (9900001-9999999)(1999) Lawn Mower
20027 (200000001-200999999)(2000) Lawn Mower
20027 (210000001-210999999)(2001) Lawn Mower
20028 (9900001-9999999)(1999) Lawn Mower
20028 (200000001-200999999)(2000) Lawn Mower
20028 (210000001-210999999)(2001) Lawn Mower
20029 (9900001-9999999)(1999) Lawn Mower
20030 (9900001-9999999)(1999) Lawn Mower
20030 (200000001-200999999)(2000) Lawn Mower
20030 (210000001-210999999)(2001) Lawn Mower
20033 (220000001-220999999)(2002) Lawn Mower
20033 (230000001-230999999)(2003) Lawn Mower
20033 (240000001-240999999)(2004) Lawn Mower
20035 (210000001-210999999)(2001) Lawn Mower
20036 (220000001-220999999)(2002) Lawn Mower
20036 (230000001-230999999)(2003) Lawn Mower
20036 (240000001-240999999)(2004) Lawn Mower
20037 (220000001-220999999)(2002) Lawn Mower
20037 (230000001-230999999)(2003) Lawn Mower
20037 (240000001-240999999)(2004) Lawn Mower
20038 (220000001-220999999)(2002) Lawn Mower
20038 (230000001-230999999)(2003) Lawn Mower
20038 (240000001-240999999)(2004) Lawn Mower
20039 (220000001-220999999)(2002) Lawn Mower
20039 (230000001-230999999)(2003) Lawn Mower
20039 (240000001-240999999)(2004) Lawn Mower
20041 (250000001-250999999)(2005) Lawn Mower
20042 (210000001-210999999)(2001) Lawn Mower
20042 (200000001-200999999)(2000) Lawn Mower
20042 (9900001-9999999)(1999) Lawn Mower
20043 (210000001-210999999)(2001) Lawn Mower
20043 (200000001-200999999)(2000) Lawn Mower
20043 (9900001-9999999)(1999) Lawn Mower
20045 (210000001-210999999)(2001) Lawn Mower
20045 (200000001-200999999)(2000) Lawn Mower
20045 (9900001-9999999)(1999) Lawn Mower
20048 (210000001-210999999)(2001) Lawn Mower
20049 (250000001-250999999)(2005) Lawn Mower
20053 (260000001-260999999)(2006) Lawn Mower
20053 (250000001-250999999)(2005) Lawn Mower
20054 (250000001-250999999)(2005) Lawn Mower
20054 (260000001-260999999)(2006) Lawn Mower
20055 (250000001-250999999)(2005) Lawn Mower
20055 (260000001-260999999)(2006) Lawn Mower
20056 (250000001-250999999)(2005) Lawn Mower
20056 (260000001-260999999)(2006) Lawn Mower
20057 (250000001-250999999)(2005) Lawn Mower
20057 (260000001-260999999)(2006) Lawn Mower
20058 (250000001-250999999)(2005) Lawn Mower
20058 (260000001-260999999)(2006) Lawn Mower
20065 (270000001-270999999)(2007) Lawn Mower
20101 (1000001-1999999)(1991) Lawn Mower
20183B (4900001-4999999)(1994) Lawn Mower
20212 (1000001-1999999)(1991) Lawn Mower
20213 (1000001-1999999)(1991) Lawn Mower
20213 (2000001-2999999)(1992) Lawn Mower
20214 (1000001-1999999)(1991) Lawn Mower
20214 (2000001-2999999)(1992) Lawn Mower
20215 (1000001-1999999)(1991) Lawn Mower
20215 (2000001-2999999)(1992) Lawn Mower
20216 (1000001-1999999)(1991) Lawn Mower
20217 (1000001-1999999)(1991) Lawn Mower
20217 (2000001-2999999)(1992) Lawn Mower
20218 (1000001-1999999)(1991) Lawn Mower
20218 (2000001-2999999)(1992) Lawn Mower
20322 (2000001-2999999)(1992) Lawn Mower
20327B (2000001-2999999)(1992) Lawn Mower
20328B (2000001-2999999)(1992) Lawn Mower
20433 (39000001-39999999)(1993) Lawn Mower
20434 (3900001-3999999)(1993) Lawn Mower
20434 (4900001-4999999)(1994) Lawn Mower
20435 (39000001-39999999)(1993) Lawn Mower
20435 (49000001-49999999)(1994) Lawn Mower
20435WF (39000001-39999999)(1993) Lawn Mower
20436 (39000001-39999999)(1993) Lawn Mower
20436 (49000001-49999999)(1994) Lawn Mower
20436WF (39000001-39999999)(1993) Lawn Mower
20437 (39000001-39999999)(1993) Lawn Mower
20437 (49000001-49999999)(1994) Lawn Mower
20441 (5900001-5999999)(1995) Lawn Mower
20441 (6900001-6999999)(1996) Lawn Mower
20442 (5900001-5999999)(1995) Lawn Mower
20442 (6900001-6999999)(1996) Lawn Mower
20443 (5900001-5999999)(1995) Lawn Mower
20443 (6900001-6999999)(1996) Lawn Mower
20444 (5900001-5999999)(1995) Lawn Mower
20444 (6900001-6999999)(1996) Lawn Mower
20445 (7900001-7999999)(1997) Lawn Mower
20448 (7900001-7999999)(1997) Lawn Mower
20449 (7900001-7999999)(1997) Lawn Mower
20450 (8900001-8999999)(1998) Lawn Mower
20452 (8900001-8999999)(1998) Lawn Mower
20453 (6900001-6999999)(1996) Lawn Mower
20454 (6900001-6999999)(1996) Lawn Mower
20457 (7900001-7999999)(1997) Lawn Mower
Expand the 150+ compatible machines
Products Compatibility

This item works with the following types of products:

  • • Engine
  • • Generator
  • • Lawn Mower
Questions & Answers

No questions have been asked yet
Repair Instructions: Submitted by Customers Like You
3 of 3 people found this instruction helpful
Tool Type:
Lawn Mower
Parts Used:
Crankcase Gasket - 692232
Seal-Oil - 399781S
Repair Difficulty:
Easy
Time Spent Repairing:
30-60 minutes
Tools Used:
Screwdriver, Socket set
Leaking lower crankshaft seal.
Drain oil, remove engine from mower, remove lower half of crankcase and pry out the old seal. Clean up the crankshaft, push the new seal into the lower half of the crankcase, then install the new gasket and bolt everything back together.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Tool Type:
Engine
Parts Used:
Crankcase Gasket - 692232
Seal-Oil - 399781S
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
Socket set, Nutdriver
Leaking oil from crankcase
Removed crankcase cover, replaced seal and gasket
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Tool Type:
Lawn Mower
Parts Used:
Crankcase Gasket - 692232
Seal-Oil - 399781S
Crankshaft - 691456
Repair Difficulty:
Medium
Time Spent Repairing:
30-60 minutes
Tools Used:
Screwdriver, Socket set, Wrench Set, Nutdriver, Drill/Driver with adjustable clutch, inch #s torque wrench
Bent crankshaft
Removed engine from push mower
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 shaft
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!
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Tool Type:
Lawn Mower
Parts Used:
Air Filter Cartridge - 491588B
Gasket-Cylinder Head - 692249
Crankcase Gasket - 692232
Seal-Oil - 399781S
Starter Rope - 697316
Grip-Starter Handle - 281434S
Air Cleaner Gasket - 795629
Spark Plug - 796112S
Repair Difficulty:
Hard
Time Spent Repairing:
More than 2 hours
Tools Used:
Screwdriver, Pliers, Power Drill, Socket set, Wrench Set, Nutdriver
very little compression ex. valve leaked
Completely disassembled engine cleaned all parts and repainted
honed the cylinder, regrind both valves
reassembled all parts by changing out all ordered parts.

Did you find this story helpful?
Thanks for voting and helping fellow customers!
Tool Type:
Engine
Parts Used:
Crankcase Gasket - 692232
Seal-Oil - 399781S
Repair Difficulty:
Medium
Time Spent Repairing:
1-2 hours
Tools Used:
Screwdriver, Pliers, Socket set, Wrench Set, Adjustable Wrench
Seal leaking at out put shaft,letting oil drain out and locked the motor up.
Removed the crank case cover. Replaced the out put shaft seal and case gasket. Flushed the engine out with gunk motor flushing oil. Reset the coil clearance. Started the motor, ran for 1/2 hour, drained the oil and replaced with fresh oil. This repair saved me getting a new power washer that would cost around 400.00 dollars. The hardest part was finding the m/n of the motor as I do not work on these very often.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Reviews
5
Average Rating (out of 5):
2 Reviews
Click to filter by ratings:
5 stars
2
4 stars
0
3 stars
0
2 stars
0
1 stars
0
  • Highest Rating
  • Most Recent
< PREV
  • 1
NEXT >
  • Worked as expected
    Fit perfectly, easy replacement, fixed my oil leak
    Steven - June 16, 2022 Verified Purchase
    great part
    arrived quickly
    Richard - October 9, 2021 Verified Purchase
    Verified Purchase
    eReplacementParts Team
    • Highest Rating
    • Most Recent
    < PREV
    • 1
    NEXT >
    Product Information
    Manufacturer: Briggs and Stratton, Toro, Lawn Boy
    Product Number: 399781S
    Classification: Part
    Weight: 0.02 lbs.
    Shipping: Ships Worldwide

    Fixing things makes sense...

    ...And we make it easy! With our Fix app, you always have a personalized repair guide on-hand. Easily find manuals and replacement parts on your phone while you’re DIYing in the garage or garden.

    "Love the flexibility of the app to add everything in the home and garage. Access to manuals and parts right there makes it convenient."

    Available on the App Store Get it on Google Play
    eReplacementParts.com
    7036 South High Tech Dr.
    Midvale, UT 84047
    visa mastercard discover american express PayPal