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Old 04-19-2014
dabnis dabnis is offline
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Re: Impeller replacement Merc 5hp

Originally Posted by jballou View Post
OK - thanks everyone for the useful comments. Impeller has been replaced - not difficult at all!

But now I am having trouble re-inserting the lower unit back into the drive shaft housing. Unit will go in until it feels like the drive shaft is bumping up against something - about 3" short. So the drive shaft is not going in enough. Gear shift is in reverse.

Any ideas on what might be the problem and how to solve it would be greatly appreciated!

cheers - jballou
It is possible that the splines are not lined up on either, or both, the power head or gear box. With the spark plug removed, try turning the engine over, slowly and then the prop with it in gear. I hope you did not take the shaft out of the gear casing as it may be difficult to re-insert it? No experience with your particular motor, but IIRC on OMC motors, the gears may "mis-align" when the shaft is removed.

Paul T
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jballou (04-19-2014)