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Author Topic:   Water impeller replacement.OMC vs.Yamaha
grandmufti posted 03-07-2002 01:35 PM ET (US)   Profile for grandmufti   Send Email to grandmufti  
Is there any difference in the procedure for replacing a water pump in a Yamaha.I have done Evinrude and Johnson.Specifically does the Yamaha have a long shift rod that disconnects under the cowl as does Evinrude and Johnson.Are there any surprises that I should be aware of before I undertake this task?
flieman posted 03-07-2002 05:08 PM ET (US)     Profile for flieman  Send Email to flieman     
Yamahas do not have to have the shift rod disconnected as it is a splined shaft that comes apart when you drop the lower unit. Other than that they are very similiar in the way everything works. I put lots of never-seize on every bolt when I put it back together so there will be no problems next time with corrosion.
grandmufti posted 03-07-2002 07:13 PM ET (US)     Profile for grandmufti  Send Email to grandmufti     
As I drop the lower unit where on the shaft will I find the "joint" or the separation of the splined shaft?Is it nearer to the lower unit or closer to the head?
whalerron posted 03-07-2002 11:36 PM ET (US)     Profile for whalerron  Send Email to whalerron     
Make sure you lube those splined shafts with molydbeum grease (spelling?). This kind of grease is specifically designed for applications where metal parts must slide against each other. It will keep that splined shaft from "freezing" together. Because this was always recommended on the older outboards, I assume it still holds true.

- ron

Clark Roberts posted 03-08-2002 07:35 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
I have had lots and lots of Yamahas and none of the shift shafts were not splined (ala-Merc) but required disconnection via threaded shaft/lock nut arrangement forward and just above the anti-cavitation plate... DO NOT TRY TO DROP LOWER UNIT WITHOUT CHECKING THIS OUT!!!!!!! Happy Whalin'.. Clark.. Spruce Creek Navy
Clark Roberts posted 03-08-2002 07:38 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Edit! delete "not" in front of "splined (ala-merc)"... whoops
grandmufti posted 03-08-2002 09:38 AM ET (US)     Profile for grandmufti  Send Email to grandmufti     
The motor in question is a 225 1999 yamaha.I do not have access to it at this time.Is it splined or is it setup as Clark described.
Bigshot posted 03-08-2002 10:33 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Splined....only the smaller ones had to be disconnected. I believe 90+ were all splines.
flieman posted 03-08-2002 10:50 AM ET (US)     Profile for flieman  Send Email to flieman     
V4s and V6s are splined for sure, I have not worked on 3 cyl, the spline is right at the joint of the lower unit to the downhousing and it will come right apart, the lower unit may hang depending on if the drive shaft comes right out of the powerhead or not. One piece of advice is take the prop off as it will be lighter and easier to handle. I drop the lower unit in the grass and the skeg will go down in the dirt and hold the lower unit up vertically to replace the pump, otherwise you have to work on it in different angles and can be frustrating. Just my thoughts
grandmufti posted 03-08-2002 05:57 PM ET (US)     Profile for grandmufti  Send Email to grandmufti     
Thanks for all of your input.I can now proceed with confidence.

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