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.
Hardest part was getting the old oil seal out without marring the counterbore on the oil sump where it seats. \"Marvel Mystery Oil\" worked well to install new part and assemble the rest. No more adding oil every time to mow the lawn. Won\'t keep a pizza pan under lawn wower in the shed for the oil leak now. Next time will not mow over st
... Read morering that wrapped around the crankshaft and tore up the oil seal.
1. Removed the engine from the lawn mower.
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.
Comment: I worked in a lawn mower repair shop for about four years. This repair was very easy for me but may be a bit challenging for someone not really familiar with an engine from the inside ...
1. Drain oil and fuel; remove control cables, blade, and then remove engine from mower base.
2. Clean end of crankshaft
... Read morewith 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 ...
1. Remove blade
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
m
... Read moreetal 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.
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Model Cross Reference
This part works with the following models:
ERP Number: ERP8966301
Manufacturer Part Number: 391483S
This part is in stock in our warehouse and will ship out within 1 business day of the order being placed.
New stock is on the way! On order parts usually ship within 7 business days.
Item is not in stock and usually ships 10-15 business days from the time you place your order.
This item is no longer being made by the manufacturer, and cannot be added to your shopping cart.
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Mail-In Recycling Rebate
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.
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