Yamaha outboards impeller change manual

Impeller is a crutial part in marine engines. It is the main part of the water pump and is used to pump fresh and cold water to the engine cooling system. That is why it is so important to check its state very often. If your impeller is broken you may damage your engine becouse of overheating. There is an unwritten rule that says that you should replace your impeller on your Yamaha outboards every two years even if it’s in good condition.

Replacing your Yamaha outboard impeller

1. First we unscrew the four screws that are visible on the side of the yamaha outboard heel.
2. Next we have to remove the rubber plugin on the narrow end of the outboard motor and we unscrew the zinc protector that is located above the proppeler
3. We remove the zinc protector and we unscrew the number 12 bolt from the bottom side
4. Next we have to remove yamaha outboards heel and remove it from the outboard motor
5. We have to buy original Yamaha outboard impeller
6. Next we remove the four bolts from the water pump housing
7. We use a hammer to gently tap on the water pump housing to remove it (Warning: Handle with care!!)
8. What we see in front of us is a Yamaha outboard motor shaft with a small rubber proppeler attatched to it => that is impeller
9. We take the impeller of the shaft (if it won’t go of we use a knife on it)
10. We put our newly bought original Yamaha outboard  impeller on the shaft and put a small metal plugin inside a little hole in the shaft to hold the impeller in place
11. We put the water pump housing back in place and we have to wrap the impeller blades to fit inside the pump housing
12. The blades must be slightly bent inside the water pump housing
13. We than screw everything back in its place, and before you put your screws in you might consider lubricating them with a water resistant lubricant (YamaLube)
14. You should also lubricate all the movable parts of your Yamaha outboard

Summary

Usual service cost: 150 EUR

Impeller cost: 35 EUR
Time used: 30 minutes

Money saved: 115 EUR

As you can see I managed to saved quite a large amount of money when I decided to service my own Yamaha outboard. I think that every boat owner shuld know how to do some basic motor servicing, as you never know what can happen while you are at sea.

Step 1 - Unscrewing the four screws on the engine heel	Step 2 - removing the four bolts from the water pump housing
Step 3 - Removing the old impeler	Step 4 - Closer look at the old impeler - It is broken
New ORIGINAL YAMAHA impeller	Old and new impeler
Step 5 - New impeler in place and ready for reassembly

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