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Old 19 April 2018, 13:45   #1
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Replacing impeller

Hi guys

Trying to replace the impeller on my yam 30 2 stroke.
Iíve got to the point of having the lower unit bolts undone, and gear linkage undone , but after that I just cannot get the lower unit off at all. Itís just donít budging.. tried a block and hammer, but no. Anyone any advice?

Phil
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Old 19 April 2018, 14:10   #2
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no expert so just a maybe ..............in gear ,,,,,,,,neutral ??
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Old 19 April 2018, 14:12   #3
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Hi mate - yeah I thought that but I can’t see how that would affect it considering I’ve disconnected the gear linkage from the shifter..
I’m hearing rumours of a bolt under the cavitation plate.. I didn’t check there so maybe I’ve missed a bolt
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Old 19 April 2018, 14:23   #4
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no worries there will be a man in the know along very soon ,i am sure ,again can say definitely another bolt under my trim tab anode on my 115
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Old 19 April 2018, 15:42   #5
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Last bolt is under the zinc anode trim tab.
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Old 19 April 2018, 16:42   #6
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There is a bolt going up the way under the anode on a 3 cylinder engine but not on the 2 cylinder engine
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Old 20 April 2018, 12:18   #7
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Quote:
Originally Posted by Davie View Post
There is a bolt going up the way under the anode on a 3 cylinder engine but not on the 2 cylinder engine
Thanks Davie.

It was there on my 40hp 3-cylinder and can't remember how I used to do it on my 25hp, but that was a 2-cylinder as you mentioned.

If all bolts are off on the leg and the gear linkage is in neutral then it should come off (assuming gear linkage it isn't connected further down?) Could be splined drive shaft is seized. Whack the anti cavitation plate with a rubber mallet supporting the leg properly.

You can also check these drawings - if you know outboard model and year of manufacture.
Yamaha Outboard Parts
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Old 24 April 2018, 13:38   #8
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Cheers for the help guys. I was indeed missing the 5th bolt under the trim tab! Muppet!!
Annoyingly when I when to undo it, it was absolutely seized. Despite cautious attempts it ended up shearing. Luckily managed to get the lower unit off, changed the impeller and was able to extract the sheared bolt quite easily and replace it. Greased all the bolts liberally upon reassembly!
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Old 24 April 2018, 14:48   #9
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Excellent. Glad to hear you got it sorted.
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