Quick Answer: How To Repair Lower End On 25 Horse Boat Engine?

How do I know if my lower unit is damaged?

Bad outboard lower units can give the operator shifting issues, and other signs will include water in the gear lube, metallic particles on the drain screw magnet, clunking sounds when shifted, or the loss of the ability to shift into gears.

How do you remove a lower unit drive shaft?

Set the lower unit upright in a bench vise. Remove the four bolts holding the water pump together from the water pump housing with a socket wrench. Slide the impeller from the lower unit and slide them up and off the driveshaft. Pull the impeller plate off the lower unit and slip it off the driveshaft.

Are lower units interchangeable?

It is true that Johnson / Evinrude lower units can be interchanged however, you can’t rely on visual comparison alone.

How much does it cost to rebuild lower unit?

A typical set of parts for the gearcase can cost $500-600 and may go higher if the gearcase is severely damaged. If you have your local mechanic repair the lower unit, his labor will run about $300-400 for this type of repair.

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What oil goes in an outboard lower unit?

You can use any brand of lubricant that has a grade designation of API GL5 SAE 80 or 90 weight. Make sure you do not mix different oil brands or weights. into the BOTTOM drain hole. Then slowly squeeze the bottle to force the oil into the lower unit.

Can I use regular gear oil in my lower unit?

So, can you use any old gear lube in your marine lower unit? If you want the best protection possible, and want your lower unit to last as long as your boat, then the answer is no. Consult your engine’s manual and look for the proper marine gear lube for your application.

How often should you change outboard lower unit oil?

Most sterndrive and outboard manufacturers advise you to change the gearcase oil in your lower unit every 100 hours or once a year (whichever comes first). Clean oil is critical for protecting the heavily loaded gears in your lower unit and preventing expensive damage.

Why do you fill a lower unit from the bottom?

Air.it will take you forever to fill from the top due to all of the air that must be vented out in the process. When you fill from the bottom, with the top plug out, you force the air out as you force the lube in.

How much does a lower unit on a boat cost?

We checked around and found that replacing only the shaft would be close to $1,000 with labor, but other components could also be damaged. We looked at remanufactured lower units, but they cost $2,240.

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Do you have to drain lower unit oil to change impeller?

Yes, you will need to drain the lower unit fluid.

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