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Old 18 March 2014, 13:38   #1
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Country: UK - England
Town: Northumberland
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Make: North Diver?
Length: 4m +
Engine: Yamaha 90 Autolube
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Yamaha 90hp autolube bolt sheared

Hi folk ,
Has the outboard serviced and new impeller , on collection the shop said when they removed the cavitation plate anode it reveals a hidden locking nut which was sheared , can't prove if was them or not but they claim it was knackered before they did impeller.
What I need to know is will this be a problem or not??? Think it's head that went on it
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Old 18 March 2014, 14:09   #2
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Country: USA
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This bolt shows on the Yam diagram. Even if they broke it attempting to remove it, its not like they had any other options. The only way to drop the lower unit is to remove this bolt. There are 4(?) other bolts holding on the lower leg so I don't know how critical that one is.

Perhaps you could drill it out and use an insert to replace it for you piece of mind?
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Old 18 March 2014, 15:28   #3
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Country: UK - England
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Guy said there are 4 bolts and a one under trim tab anode which is one he said was sheared ?
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Old 18 March 2014, 15:35   #4
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Make: Valiant 450
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The big pain is when these engines are new, the bolts should be properly greased by the manufacturer.

A good PDI technician would grease these bolts and the powerhead ones. This does not stop the mount bolts seizing.

The manufacturers should bite the bullet and realise they are building marine engines.

Technicians should have it drummed into them when apprentices which bolts to grease.
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Old 18 March 2014, 16:27   #5
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Country: UK - England
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Make: North Diver?
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Engine: Yamaha 90 Autolube
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So is it crucial that bolt/ locking nut is not there and sheared off ? Guessing was head that went n other bolts were taken out and he was able to slide over sheared bolt
Just after peace of mind it's ok , don't fancy drilling n re - taping
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Old 18 March 2014, 19:16   #6
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That engine has 4 visual bolts and 1 hidden one onder trim tab. Can live without it, lower leg won't fall down when at use. Probably solid stuck with salt to lower leg. If just head is missing, soak bolt remains in W-40, let penetrate, if bolt body is long enough try to unscrew it with a pressure plier.

Happy Boating
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Old 19 March 2014, 11:38   #7
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You can leave that bolt off if the other 4 are sound.
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