LukeFishWalker
Petty Officer 3rd Class
- Joined
- Jul 23, 2015
- Messages
- 95
The other day I had taken the 1996 Nissan 30 out for some night fishing.
I had changed the complete water pump with a Tohatsu OEM repair kit before putting it in the water.
The day I put the pump in, it pumped but not a full stream at idle like my Tohatsu 25.
During the night I moved the boat from 1 location to another.
Then, when it was time to leave (2:00am) I noticed the tattle tail just barely spit water out.
So, I pulled the cowl and put my hand on the head while I ran to the main canal.
It didn't get too hot (almost to the point where I didn't like it) but we were lucky
to get a tow back to the launch (12 miles).
The next day I took the lower unit off and removed the thermostat.
I ran a water hose to the pipe in the exhaust housing and flushed back & forth between
the thermostat housing (Both Ways), the water inlet and the tattle tail.
I didn't use a great deal of pressure but every port I ran water through ran freely.
I then put the thermostat back in and used an old washing machine hose that was cut
(The cut end fit right on with minimal force) and cranked the engine. Again, I didn't use
a great deal of pressure and the flow was fine.
My question is:
Is there a way to improve water pressure created by the impeller by altering the slots in the
plate below the impeller in order to allow more flow and less resistance?
The 2 "Slots" on the plate seem a bit small in my opinion.
Thank You For Your Time And Patience,
Lukus
I had changed the complete water pump with a Tohatsu OEM repair kit before putting it in the water.
The day I put the pump in, it pumped but not a full stream at idle like my Tohatsu 25.
During the night I moved the boat from 1 location to another.
Then, when it was time to leave (2:00am) I noticed the tattle tail just barely spit water out.
So, I pulled the cowl and put my hand on the head while I ran to the main canal.
It didn't get too hot (almost to the point where I didn't like it) but we were lucky
to get a tow back to the launch (12 miles).
The next day I took the lower unit off and removed the thermostat.
I ran a water hose to the pipe in the exhaust housing and flushed back & forth between
the thermostat housing (Both Ways), the water inlet and the tattle tail.
I didn't use a great deal of pressure but every port I ran water through ran freely.
I then put the thermostat back in and used an old washing machine hose that was cut
(The cut end fit right on with minimal force) and cranked the engine. Again, I didn't use
a great deal of pressure and the flow was fine.
My question is:
Is there a way to improve water pressure created by the impeller by altering the slots in the
plate below the impeller in order to allow more flow and less resistance?
The 2 "Slots" on the plate seem a bit small in my opinion.
Thank You For Your Time And Patience,
Lukus
