The Boating Forum - replacing lower unit an 89 Yamaha lower unit
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05-26-2004, 10:48 PM
I am posting this for a friend. The previous owner was trying to replace the water pump and could not remove the lower unit. He ended up getting PO'd and hit it with a rubbe mallet which cracked the housing.
What is involved in replacing it?
Motor is an 89 Yamaha 130
05-27-2004, 09:48 AM
Assuming all the bolts have been removed, there is a rubber bushing in the upper casing just above where the water pump goes up into the upper housing. This rubber bushing swells over the years and binds on the drive shaft. If this happen, you need to crack the lower housing loose, then use wedges to brake the rubber bushing. Once you have it off, look up into the upper housing, remove the "C" retaining clip, and chisel out the old bushing and replace. If this is not the problem, then the drive shaft could be seized into the crank. One other thought did he remove the bolt under the steering trim Zinc? This is one of the reason you have to pull the lower unit every so often and coat everything!
05-27-2004, 10:35 AM
I suspect that he forgot to remove the seventh bolt which is under the zinc. If the housing is already cracked and cannot be repaired you can beat on it as hard as you want to bust it loose.
05-27-2004, 02:19 PM
thanks for the replys