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197 Posts
Hi folks,
Pretty new at this and trying my hand at some needed maintenance. Got my boat last year with a C60TLRW (98 Yamaha 60hp 2stroke) on the back. Runs pretty good (well, rough now, not sure what to do there). I felt that the stream from the tell-tale was pretty weak compared to some on youtube so I figured I'd check/replace the impeller.
A few things:
1. When I dropped the lower unit, I noticed there was a fair bit of sand on and around the water pump (impeller) housing. I hadn't really seen that in a lot of the videos online. Everything looks pretty clean. Maybe that's normal. I cleaned it up pretty good. Is that to be expected?
2. I pulled off the housing to reveal the impeller. Sure enough, it was deformed like they all show on youtube. The fins don't stick straight out and are rounded back. (Ok. So this is what I assume meant there is a gap between the fins and the housing and the impeller was inefficient. When I look under the housing part that I pulled off, there is a stainless "cup" that envelops the impeller. It's smaller than the diameter of the impeller, even with its fins rolled back. I have to work the impeller into that spot. So it seems to me that this impeller should be fine. But maybe I don't understand the pressure those fins are under. Maybe, under power, these rounded over fins, round over even more, causing inefficient flow. What do you think?
It's not a big deal to fix at all, I'm just wondering if it could even be the problem. And if I don't need to fix it, I'll save it for future replacement or return the impeller and use the 30 bucks on something else...
3. When I dropped the lower unit, there was a hose to detach at the front end, right in front of the shifter shaft (?). I couldn't pull it off the barb and found out that the other end was loose anyway! Turns out, that it was just held up underneath the main motor body at the top but not attached to anything. Just a barb sticking out. What's it for? My bro-in-law thought it was a pressure-relief hose of some sort. This hose is in rough shape at the top. Cracked for the first ten inches or so.
The boat is from Florida and has maybe seen some sand in its day...
A clean 'cup' that the impeller fits into.
The 'misshapen', rounded over impeller, seems to fit pretty tight in there. Do I really need to replace it? Not a big deal, just not sure if it fixes my problem.
The mystery hose - unattached since I got the boat/motor.
Pretty new at this and trying my hand at some needed maintenance. Got my boat last year with a C60TLRW (98 Yamaha 60hp 2stroke) on the back. Runs pretty good (well, rough now, not sure what to do there). I felt that the stream from the tell-tale was pretty weak compared to some on youtube so I figured I'd check/replace the impeller.
A few things:
1. When I dropped the lower unit, I noticed there was a fair bit of sand on and around the water pump (impeller) housing. I hadn't really seen that in a lot of the videos online. Everything looks pretty clean. Maybe that's normal. I cleaned it up pretty good. Is that to be expected?
2. I pulled off the housing to reveal the impeller. Sure enough, it was deformed like they all show on youtube. The fins don't stick straight out and are rounded back. (Ok. So this is what I assume meant there is a gap between the fins and the housing and the impeller was inefficient. When I look under the housing part that I pulled off, there is a stainless "cup" that envelops the impeller. It's smaller than the diameter of the impeller, even with its fins rolled back. I have to work the impeller into that spot. So it seems to me that this impeller should be fine. But maybe I don't understand the pressure those fins are under. Maybe, under power, these rounded over fins, round over even more, causing inefficient flow. What do you think?
It's not a big deal to fix at all, I'm just wondering if it could even be the problem. And if I don't need to fix it, I'll save it for future replacement or return the impeller and use the 30 bucks on something else...
3. When I dropped the lower unit, there was a hose to detach at the front end, right in front of the shifter shaft (?). I couldn't pull it off the barb and found out that the other end was loose anyway! Turns out, that it was just held up underneath the main motor body at the top but not attached to anything. Just a barb sticking out. What's it for? My bro-in-law thought it was a pressure-relief hose of some sort. This hose is in rough shape at the top. Cracked for the first ten inches or so.
The boat is from Florida and has maybe seen some sand in its day...

A clean 'cup' that the impeller fits into.

The 'misshapen', rounded over impeller, seems to fit pretty tight in there. Do I really need to replace it? Not a big deal, just not sure if it fixes my problem.

The mystery hose - unattached since I got the boat/motor.
