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Author Topic:   yamaha lower unit failure

mtwilling posted 07-27-2009 01:19 PM ET (US)
My 2000 model Yamaha F100 had its water pump go bad last weekend and the dealer repaired it. After about 2 miles of boat riding after picking up the boat the lower unit siezed. We towed it back to the marina and they said it had no foot oil and they did not cause this. The foot oil was changed in April and there is no obviuos leak. I am not familiar with the process of changing a water pump so does it seem right that they say they could not have caused this? By the way, they want $2,100 to fix the problem.
Blackduck posted 07-27-2009 04:21 PM ET (US)
Changing the water pump does not require draining the gear case oil, but-
outragesteve posted 07-27-2009 06:52 PM ET (US)
Sounds like someone screwed up....You can buy a brand new lower unit, complete, from Boats.net for $1486.00. 1 hour labor max to change: Only 6 bolts! Looks like your marina likes the look of yur wallet! Good luck
acseatsri posted 07-27-2009 07:07 PM ET (US)
If all they did was replace the water pump, how was it that there was no oil left in it to begin with? I think they owe you a new lower unit.
Jeff posted 07-27-2009 07:25 PM ET (US)
It would take a lot more than 2 miles of use without oil for the lower unit to fail and sieze up.
mtwilling posted 07-27-2009 07:25 PM ET (US)
I agree. The boat had no symptoms of foot trouble so it is amazing that it failed on the way home from the marina.think I will go have a long talk with the marina.
Martino posted 07-28-2009 06:46 AM ET (US)
They probably pressure tested the LU when they had the pump off. They just forgot to replace the oil. I would try to find out what the shops SOP is on waterpump replacements--that is, do they always change the LU oil when they do a pump job?
tom976 posted 07-28-2009 09:13 AM ET (US)
Sounds like the marina mechanic made a mistake.
Here's a great question... Was the lower unit emply as in it had air in it or was it empty as it lost all of its oil and water was in there. When the seals fail on the lower unit, water gets in there and makes the oil look like coffee. Gradually the mix changes over to more water than oil, but that does take some time. The gear oil in there is somewhat thick stuff (smells horrible too), if it was leaking out either at the house (if trailered) or at the marina, it would be easily seen. Now unless there is a good size crack in there from hitting something, there really isnt a way for nothing but air to be in a lower unit (unless it was drained and not refilled of course).
Pressure testing the lower unit is pretty much standard practice when its laying on a bench off the motor. If you had no oil in there, 2 miles may be as far as you can go with no lubrication in there... Things can get hot quickly when air is your lubricant.
I would look over what they charged you. If it says ANYTHING about lower unit pressure testing or fluid its time for a chat. They will either owe you a rebuilt lower unit or split the cost of a new one. Labor should be only for an hour considering how easy it is change and can be easily absorbed by them.
acseatsri posted 08-03-2009 06:51 PM ET (US)
Just curious, how was this resolved?

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Author	Topic: yamaha lower unit failure
mtwilling	posted 07-27-2009 01:19 PM ET (US) My 2000 model Yamaha F100 had its water pump go bad last weekend and the dealer repaired it. After about 2 miles of boat riding after picking up the boat the lower unit siezed. We towed it back to the marina and they said it had no foot oil and they did not cause this. The foot oil was changed in April and there is no obviuos leak. I am not familiar with the process of changing a water pump so does it seem right that they say they could not have caused this? By the way, they want $2,100 to fix the problem.
Blackduck	posted 07-27-2009 04:21 PM ET (US) Changing the water pump does not require draining the gear case oil, but-
outragesteve	posted 07-27-2009 06:52 PM ET (US) Sounds like someone screwed up....You can buy a brand new lower unit, complete, from Boats.net for $1486.00. 1 hour labor max to change: Only 6 bolts! Looks like your marina likes the look of yur wallet! Good luck
acseatsri	posted 07-27-2009 07:07 PM ET (US) If all they did was replace the water pump, how was it that there was no oil left in it to begin with? I think they owe you a new lower unit.
Jeff	posted 07-27-2009 07:25 PM ET (US) It would take a lot more than 2 miles of use without oil for the lower unit to fail and sieze up.
mtwilling	posted 07-27-2009 07:25 PM ET (US) I agree. The boat had no symptoms of foot trouble so it is amazing that it failed on the way home from the marina.think I will go have a long talk with the marina.
Martino	posted 07-28-2009 06:46 AM ET (US) They probably pressure tested the LU when they had the pump off. They just forgot to replace the oil. I would try to find out what the shops SOP is on waterpump replacements--that is, do they always change the LU oil when they do a pump job?
tom976	posted 07-28-2009 09:13 AM ET (US) Sounds like the marina mechanic made a mistake. Here's a great question... Was the lower unit emply as in it had air in it or was it empty as it lost all of its oil and water was in there. When the seals fail on the lower unit, water gets in there and makes the oil look like coffee. Gradually the mix changes over to more water than oil, but that does take some time. The gear oil in there is somewhat thick stuff (smells horrible too), if it was leaking out either at the house (if trailered) or at the marina, it would be easily seen. Now unless there is a good size crack in there from hitting something, there really isnt a way for nothing but air to be in a lower unit (unless it was drained and not refilled of course). Pressure testing the lower unit is pretty much standard practice when its laying on a bench off the motor. If you had no oil in there, 2 miles may be as far as you can go with no lubrication in there... Things can get hot quickly when air is your lubricant. I would look over what they charged you. If it says ANYTHING about lower unit pressure testing or fluid its time for a chat. They will either owe you a rebuilt lower unit or split the cost of a new one. Labor should be only for an hour considering how easy it is change and can be easily absorbed by them.
acseatsri	posted 08-03-2009 06:51 PM ET (US) Just curious, how was this resolved?