presleymarkw
Seaman Apprentice
- Joined
- Jun 14, 2021
- Messages
- 43
I bought this engine a year or so ago. Its been abused pretty hard but has perfect compression. Been fixing it up, even had the wrong carb when I bought it, turned around backward so the linkages would fit. Very inventive mechanics.
So when it stopped peeing I went right for the impeller. The impeller cap was in very poor condition. Seems to have been exposed to some high heat. Seemed like parts of the cap had melted and there were rough obstructions that were eating away at the impeller. Flexible impeller so someone had replaced it knowing the condition of the cap. Even the water channel cover next to the cap was malformed. Definatly small bit were being abrased off the impeller, not real bad but bad enough.
I replaced the cap, the cover and the impeller. Still wouldn't pass water, so I decided (incorrectly) that it must be the thermostat and pulled off the intake manifold and inspected the water channel realizing the telltale isn't inline with the thermostat. Replaced Thermostat and gaskets and the warped studs. Doing this I blew out the Telltale hose and a bunch of muddy gunk came out.
Still didn't pass water. Took me allot of pouring over parts diagrams to realize I missed replacing the water tube seal that sits on top of the impeller cap. Ok so now it passes water again.
However when I run it for a while the Telltale output starts to decrease and almost to a stop. I notice some holes that are on the midsection that start to put out steam. Don't know if this has an overheat alarm but I stopped it immediately at that point. The telltale water was very hot compared to the water in the trashcan.
I started it again next day and could see the same symptoms start. When its cold the stream is strong. As the engine runs for a good 10 to 15 mins the pressure from the telltale decreases and the water starts to get warm. I dont push it to where it almost stops.
I see two possibilities. 1. new thermostat is defective or I installed it wrong some how. 2. There are impeller bits in the block affecting flow.
I think my plan is to take off the intake manifold and if thermostat is fine then drop lower unit and hook up a hose to the water tube and try to wash impeller bits out the thermostat port.
I am now thinking my water issue has started because of impeller bits. Any tips to addressing something like this?
So when it stopped peeing I went right for the impeller. The impeller cap was in very poor condition. Seems to have been exposed to some high heat. Seemed like parts of the cap had melted and there were rough obstructions that were eating away at the impeller. Flexible impeller so someone had replaced it knowing the condition of the cap. Even the water channel cover next to the cap was malformed. Definatly small bit were being abrased off the impeller, not real bad but bad enough.
I replaced the cap, the cover and the impeller. Still wouldn't pass water, so I decided (incorrectly) that it must be the thermostat and pulled off the intake manifold and inspected the water channel realizing the telltale isn't inline with the thermostat. Replaced Thermostat and gaskets and the warped studs. Doing this I blew out the Telltale hose and a bunch of muddy gunk came out.
Still didn't pass water. Took me allot of pouring over parts diagrams to realize I missed replacing the water tube seal that sits on top of the impeller cap. Ok so now it passes water again.
However when I run it for a while the Telltale output starts to decrease and almost to a stop. I notice some holes that are on the midsection that start to put out steam. Don't know if this has an overheat alarm but I stopped it immediately at that point. The telltale water was very hot compared to the water in the trashcan.
I started it again next day and could see the same symptoms start. When its cold the stream is strong. As the engine runs for a good 10 to 15 mins the pressure from the telltale decreases and the water starts to get warm. I dont push it to where it almost stops.
I see two possibilities. 1. new thermostat is defective or I installed it wrong some how. 2. There are impeller bits in the block affecting flow.
I think my plan is to take off the intake manifold and if thermostat is fine then drop lower unit and hook up a hose to the water tube and try to wash impeller bits out the thermostat port.
I am now thinking my water issue has started because of impeller bits. Any tips to addressing something like this?
Last edited: