This is an authentic replacement part manufactured for use with small engines. This oil seal keeps oil inside the crankcase, and seals the shaft. It is recommended to replace the crankcase gasket when servicing the case, the gasket is available separately. The oil seal is sold individually.
Seal-oil 391483S
OEM part for: Briggs and Stratton, Toro
Part Number: 391483S
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Compatibility
This part will fit the following 10536 machines
Briggs and Stratton
Toro
This item works with the following types of products:
- Engine Parts
- Lawn Mower Parts
This part replaces obsolete part #: 4118, 291841, 391483
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Customer Repair Instructions ?
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The oil seal between the crankshaft and oil sump
Tool Type
Lawn Mower
Difficulty
Medium
Time
1-2 hours
Tools Used
Screwdriver, Socket set, Wrench Set, Nutdriver
Parts Used
Leaking engine oil
Tool Type
Lawn Mower
Difficulty
Medium
Time
1-2 hours
Tools Used
Socket set, Hammer and penetrating oil. Impact wrench
Parts Used
Remove blade adapter (most difficult to do)
Remove old seal
Clean and buff crankshaft
Drive in new seal
Replace blade adapter and blade
Bought mower for $20. Essentially new - previous owner hit pipe and broke sump ...
Tool Type
Engine
Difficulty
Expert
Time
30-60 minutes
Tools Used
Screwdriver, Socket set, Wrench Set, Emery paper; torque wrench; miscellaneous
Parts Used
1. Drain oil and fuel; remove control cables, blade, and then remove engine from mower base.
2. Clean end of crankshaft with emery paper so shaft will move easily through old sump bearing. Put oil on shaft before you remove old sump.
3. Keep engine positioned with shaft upward; remove sump bolts. Tap sump to break seal and remove sump. (Always keep engine with shaft upward when sump is off! Otherwise camshaft will fall out and you'll have to re-time.)
4. Clean old gasket residue from block. A razor blade works nicely for this. Be careful not to score the soft aluminum mating surface during this operation.
5. Install new gasket - comes with sump - and reinstall sump. Torque bolts to 6 ft-lb.
6. Install new oil seal. Flat side goes to the outside. Use a large, deep socket or other sleeve to CAREFULLY drive the seal into place.
7. Reinstall engine to mower base; reinstall blade. Reconnect control(s) cables.
8. Add oil and fuel and you're ready to go ...
Crank case seal failed
Tool Type
Engine
Difficulty
Medium
Time
30-60 minutes
Tools Used
Pliers, Socket set, Rubber mallet, seal puller
Parts Used
2. Removed 3 bolts holding motor from deck
3. Removed 6 bolts from crank case housing
4. Use rubber mallet to knock crank case cover.
5. Remove cover casefully.
6. Inspect speed governor.
7. Remove seal, and gasket from crank case / cover with a razor and plastic scraper (no
metal scrapers, wire brushes).
8. Clean out crank case
9. Replace seal and gasket.
10. Replace cover, ensure governor is in position.
10 torque crank case bolts to 90 inches pounds (7.5 foot pounds).
11. Reattach motor to deck
12. Reattach blade.
Let her rip.
Engine used lots of oil.
Tool Type
Engine
Difficulty
Medium
Time
More than 2 hours
Tools Used
Screwdriver, Socket set, Wrench Set, Nutdriver
Crank shaft bent.
Tool Type
Engine
Difficulty
Easy
Time
30-60 minutes
Tools Used
Socket set, Wrench Set, Nutdriver
2. Split the case.
3. Removed the crank shaft.
4. Straightened the crank shaft.
5. Put the engine back together.
6. Installed the engine on the lawn mower.
7. Started on the first pull.
8. Runs like new.
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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.