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Old 26 March 2006, 16:14   #1
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impellor on blueband merc 50 cant split lower unit

hi
helping brotherinlaw with old blue band 50 merc got all the bolts undone and the lower unit drops slightly but cant get apart is there anything up top that has to be released because it feels like its a postive stop not like its just stuck on crud build up ,or is it just a bit of gentle persuasion thats required.
the impellor is shagged so need to change it ,thought i saw a strip down guide on here last year with photos of merc ,but cant find it now any advice appreciated
thanx
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Old 26 March 2006, 16:29   #2
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Nothing up top has to be released on the 50 bluebands. Has he remembered to undo the bolt under the trim tab anode?

Assuming he has then just wiggle it a lot and eventually it'll drop off.
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Old 26 March 2006, 17:21   #3
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Quote:
Originally Posted by Dino89
thought i saw a strip down guide on here last year with photos of merc ,but cant find it now any advice appreciated
thanx
I did this thread on my Yamaha Impeller change if this helps: Yamaha Impeller change
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Old 26 March 2006, 17:32   #4
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Quote:
Originally Posted by Dino89
hi
helping brotherinlaw with old blue band 50 merc got all the bolts undone and the lower unit drops slightly but cant get apart is there anything up top that has to be released because it feels like its a postive stop not like its just stuck
Did you disconnect the gearshift?
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Old 26 March 2006, 17:44   #5
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Quote:
Originally Posted by jwalker
Did you disconnect the gearshift?
You don't have to disconnect the gearshift on these motors it's a splined shaft that seperates when the leg drops.
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Old 26 March 2006, 17:47   #6
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OK, how does that work? It must rotate to change gear, I guess.
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Old 27 March 2006, 04:18   #7
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thanks for replies , will be looking again at weekend beleive all bolts have been removed so will double check! then try a bit of persausion
will post what occurs!!
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Old 27 March 2006, 16:43   #8
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Quote:
Originally Posted by jwalker
OK, how does that work? It must rotate to change gear, I guess.
Yeah, nice and simple. Can be a bit of a bugger to line back up though.
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Old 28 March 2006, 15:08   #9
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Jwalker is right the gear shift, is not the rotational drive splined shaft, its the gearcase drive, when the casing splits slightly, look in and open the screw coupling holding the gearshift, up and down rod together the coupling needs to be opened to let the unit drop off, watch for the seal and spacer on the top of the shaft as the unit comes away, they often fall off when dissambelling
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Old 28 March 2006, 15:42   #10
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Quote:
Originally Posted by gavin
Jwalker is right the gear shift, is not the rotational drive splined shaft, its the gearcase drive, when the casing splits slightly, look in and open the screw coupling holding the gearshift, up and down rod together the coupling needs to be opened to let the unit drop off, watch for the seal and spacer on the top of the shaft as the unit comes away, they often fall off when dissambelling
No, he's not. There is NO SCREW COUPLING ON THESE ENGINES. I OWN 2 OF THEM and have removed the lower units MANY TIMES.

This is what the lower unit looks like when it's off-the short splined shaft at the front of the unit is the gearchange shaft.

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