Medium
1-2 hours
This is a genuine OEM sourced replacement part designed for use with a variety of lawn and garden equipment. This item fits the cylinder and helps to provide an air tight seal to prevent any leaks. It is made out of rubber and it is sold individually. You will need a wrench set to complete this repair.
Seal-oil 391086S
OEM part for: Briggs & Stratton Engines
Part Number: 391086S
$6.59
In Stock
Ships within 1 business day 
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Compatibility
This Seal-oil will fit the following 46171 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
Briggs & Stratton Engines
Show More Compatible ModelsThis item works with the following types of products:
- Engine Parts
This part replaces obsolete part #: 298423, 391086
Customer Part Reviews ?
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LOVE THESE GUYS
THEY TAKE REALLY GOOD CARE OF YOU. I BUY OFFTEN. Chris
chris -
March 9, 2021
Verified Purchase
Quick, easy
oil seals, belt
Guest -
December 3, 2020
Verified Purchase
Great source for parts
All of my equipment, as like me, has alot of age on it. The ability to get the parts I need guarantees that the equipment will still be productive as it ages further
Charlie -
January 21, 2020
Verified Purchase
part worked as advertised
Fit perfectly and contained oil as required.
Bill -
September 26, 2019
Verified Purchase
Replace an oil seal on an old engine.
I was surprised to find an oil seal to replace the one on a 42 year old engine. The seal fit perfectly and solved the problem. Great service!!
Lawrence -
September 3, 2019
Verified Purchase
Questions & Answers ?
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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.
26 hp B/S twin broken rod repair
James - November 23, 2015
👍 4 of 4 people found this instruction helpful
Tool Type
Lawn Tractor
Difficulty
Hard
Time
More than 2 hours
Tools Used
Socket set, Wrench Set
I disassembled the engine. made a list of parts. I looked up the torque values online and using the new parts reassembled the engine. It fired right off and ran smooth. The parts I received from Replacement parts fit perfectly and the price was right. They were delivered in a timely manner.
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My engine on my Simplicity tractor lost its lower oil seal.
Michael - October 8, 2017
👍 3 of 3 people found this instruction helpful
Tool Type
Lawn Tractor
Difficulty
Medium
Time
More than 2 hours
Tools Used
Screwdriver, Socket set, Wrench Set, Adjustable Wrench
Parts Used
I had to remove the 8HP engine and associated parts from the tractor.
I didn't have to break down the engine, but removed old seal.
Cleaned the area and used Loctite to re-install new oil seal
Used JB Weld under the seal to hopefully keep the seal in place.
Put engine and all associated parts back on the tractor. Engine did good and no leaks.
Replaced Tube breather on the Breather Assembly too.
Tractor is 48 years old and it's nice to know I can still get parts for it.
THANK YOU !!!!!!!!!!!!!!!
I didn't have to break down the engine, but removed old seal.
Cleaned the area and used Loctite to re-install new oil seal
Used JB Weld under the seal to hopefully keep the seal in place.
Put engine and all associated parts back on the tractor. Engine did good and no leaks.
Replaced Tube breather on the Breather Assembly too.
Tractor is 48 years old and it's nice to know I can still get parts for it.
THANK YOU !!!!!!!!!!!!!!!
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Leaked oil
Richard - May 6, 2017
👍 2 of 2 people found this instruction helpful
Tool Type
Lawn Tractor
Difficulty
Medium
Time
1-2 hours
Tools Used
Socket set, Wrench Set, Item to drive the oil seal in to place.
Parts Used
Remove the oil pan is all and then remove the oil seal from the oil pan and clean the old gasket and replace the new one, and replace the oil pan, everything worked good.
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Crankcase gasket and oil seal leaking on an old lawn tractor
John - March 29, 2017
👍 2 of 2 people found this instruction helpful
Tool Type
Lawn Tractor
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Socket set, Wrench Set, Adjustable Wrench
Parts Used
Removed engine drained oil, removed the crankcase cover.
Replaced gasket and the new oil seal
Replaced gasket and the new oil seal
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lower case was leaking
roland - July 26, 2021
Tool Type
Lawn Tractor
Difficulty
Easy
Time
More than 2 hours
Tools Used
Screwdriver, Pliers, Socket set, Wrench Set, piston ring compressor. wash tub. Power washer sher
Parts Used
disassembled interior motor cleaned it all up . valves job and all new gaskets, than put it all back together.
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My neighbors mower made a loud clunk and bang with lots of black smoke
Jerry - June 2, 2021
Tool Type
Lawn Tractor
Difficulty
Medium
Time
More than 2 hours
Tools Used
Screwdriver, Power Drill, Socket set, Adjustable Wrench
They said I could have it so when I couldn't get it started I began looking into it and found the connecting rod and piston damaged on the number one cylinder. I ordered the parts necessary and completed the repair. The web site is very easy to navigate and shipping is quick.
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Compression spring was broken off the can-shaft
Scott - April 3, 2021
Tool Type
Lawn Tractor
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Power Drill, Socket set, Wrench Set
Drain the oil, remove motor from the frame, turned upside down to remove crankcase cover, pulled old cam-shaft out, found broken compression spring unattached, put in new parts, gaskets, seals, then adjusted compression valves to 0.004 change oil filter and put fresh oil in. The part fit perfectly! Thank you for helping me with my problems.
Thank you!
Thank you!
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Engine lost compression
Dennis - May 2, 2020
Tool Type
Lawn Tractor
Difficulty
Medium
Time
More than 2 hours
Tools Used
Screwdriver, Pliers, Socket set, Wrench Set, Pneumatic impact driver, 3/8-1/4 rachet
Parts Used
Drained fluids and removed engine in accordance with shop manual purchased through ereplacement parts.
Dissembled and ordered replacement parts.
Reassembled engine with new parts paying particular attention to torque specifications.
I am knowledgeable of mechanical properties and utilize the YouTube sites and repair manual, common sense and patience has helped me to save $$ while getting the satisfaction from achievement.
Dissembled and ordered replacement parts.
Reassembled engine with new parts paying particular attention to torque specifications.
I am knowledgeable of mechanical properties and utilize the YouTube sites and repair manual, common sense and patience has helped me to save $$ while getting the satisfaction from achievement.
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The dummy ran it without checking the oil level, signed The Dummy
Charlie - January 23, 2020
Tool Type
Engine
Difficulty
Medium
Time
More than 2 hours
Tools Used
Screwdriver, Pliers, Socket set, Wrench Set
Parts Used
First I had to disassembled the Baker Chipper Vac in order to get the engine off. Pulling the rotor head off the crankshaft end took some time with a shop made puller. Once I got that off it was easy enough to split the case and determine that the rod and piston along with the crankshaft surface were ok. What had seized was the crank bearing on the inside of the case. Once I got lubrication to it it started to turn freely. At that point I decided to go no further and ordered parts from Ereplacementparts. Engine is probably 30 years old but Ereplacementparts had what I needed for the Briggs and Stratton.
THANKS
THANKS
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governor was broke
J.K. - October 23, 2019
Tool Type
Lawn Tractor
Difficulty
Easy
Time
More than 2 hours
Tools Used
Screwdriver, Pliers, Socket set, Wrench Set, Adjustable Wrench
took motor out , made repairs ..
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OEM stands for Original Equipment Manufacturer and means the part you’re buying is sourced directly from the manufacturer who made your product. At eReplacementParts, we sell only genuine OEM parts, guaranteeing the part you’re purchasing is of better design and of higher quality than aftermarket parts.
Our product descriptions are a combination of data sourced directly from the manufacturers who made your product as well as content researched and curated by our content & customer service teams. This content is edited and reviewed internally before being made public to customers.
Our customer service team are at the ready daily to answer your part and product questions. We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
All our part reviews are solicited directly from other customers who have purchased this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
Based on data from past customer purchasing behaviors, these parts are most commonly purchased together along with the part you are viewing. These parts may be necessary or helpful to replace to complete your current repair.
All our installation videos are created and produced in collaboration with our in-house repair technician, Mark Sodja, who has helped millions of eReplacementParts customers over the last 13 years repair their products. Mark has years of experience in selling and repairing both commercial and residential products with a specialty in gas-powered equipment.
This data is collected from customers who submitted a repair instruction after replacing this exact part. Customers can rate how easy the repair was to complete and how long it took. We aggregate this data to provide a repair rating that allows customers to quickly determine the difficulty and time needed to perform their own repair.
