How many miles before alternator goes out?
The battery’s job is to start the car, and the alternator keeps it running.” Gunning says an alternator typically lasts about seven years — or about 100,000 to 150,000 miles, says Waits. Some mechanics, though, say they typically see alternators last about 80,000 miles.
Can a alternator lock up?
If the alternator locks up, it will usually snap or throw the drive belt. Bearing failure can also be caused by dirt or water contamination. Worn bearings can be replaced by disassembling the alternator and installing new bearings.
What’s the best way to tighten an alternator?
Use a socket wrench and leave it on the adjusting arm bolt (or nut) if you can, and set the socket for clockwise, in order to quickly re-tighten. Use a large straight screwdriver, pry bar, or other appropriate tool to tension the alternator against the belt. If you can, use a strong strip of wood or hammer handle if it will fit.
What happens if the alternator belt is too loose?
If the belt is too loose, it will continue to squeal and cause overheating. If it’s too tight, it could damage bearings in the alternator and/ or water pump. While the alternator tension is loose, you can remove the belt from the alternator wheel to check for bad bearings if you think this is an issue.
What to do if your alternator is overheating?
Spin the alternator and check for rumbling or restricted spinning. Symptoms also include overheating, burnt belt smell, and excess belt wear. While the engine is running, a good mechanic may determine overheating by touching near the bearings, but the typical boater shouldn’t risk getting burned.
Where is the adjusting arm slot on an alternator?
On some alternators, the adjusting arm slot is at the bottom, and it must move over its loosened engine-attachment bolt. Use a socket wrench and leave it on the adjusting arm bolt (or nut) if you can, and set the socket for clockwise, in order to quickly re-tighten.