gbak
Cadet
- Joined
- Jul 31, 2011
- Messages
- 23
I recently bought a Suzuki DT75 -88 (cheap), the motor had a scored piston (the upper one), the plan is to fix the motor and use it om my boat next summer.
I'm a newbee on boat motors, so I'm hoping you experts here can help me and guide me in the right direction!
I don't know the history of the motor, the only thing I know is that the seller said that the motor slowly stopped when driving it.
So I decided to buy the motor as it seems to be in a good shape, execpt for the scored piston which I assumed should be a piece of a cake to swap.......now I'm not so shure of this...?
I was quite near to give everything up as the powerhead was extremly difficult to loose, as five bolts holding it to the engine holder bracket was impossible to loose. Two snapped off and three came off with a lot of heating and luck! But after a days work I manage to get rock the powerhead of
)
After I pulled the head off I found one of the thermostat bolts (M6x40) down in the heads cooling channels.
The color near the no 1 sparkplug have also changed to light brown, which should indicate a hot cylinder/head.
There are also a tendency of brown color on the paint near no 2 plug.
What I'm trying to figure out first is the root cause, (dont want to fix the motor and have a scored piston again).
Can the bolt inside the head have this affect on the piston? The scoring is quite near the exhaust port and there is a big crater on top of the pistons crown.
(The plugs heating range is ok)
No 2 piston is also scored, but not much at all. Can I still use this piston?
All help are gratefully received.
I'm a newbee on boat motors, so I'm hoping you experts here can help me and guide me in the right direction!
I don't know the history of the motor, the only thing I know is that the seller said that the motor slowly stopped when driving it.
So I decided to buy the motor as it seems to be in a good shape, execpt for the scored piston which I assumed should be a piece of a cake to swap.......now I'm not so shure of this...?
I was quite near to give everything up as the powerhead was extremly difficult to loose, as five bolts holding it to the engine holder bracket was impossible to loose. Two snapped off and three came off with a lot of heating and luck! But after a days work I manage to get rock the powerhead of
)After I pulled the head off I found one of the thermostat bolts (M6x40) down in the heads cooling channels.
The color near the no 1 sparkplug have also changed to light brown, which should indicate a hot cylinder/head.
There are also a tendency of brown color on the paint near no 2 plug.
What I'm trying to figure out first is the root cause, (dont want to fix the motor and have a scored piston again).
Can the bolt inside the head have this affect on the piston? The scoring is quite near the exhaust port and there is a big crater on top of the pistons crown.
(The plugs heating range is ok)
No 2 piston is also scored, but not much at all. Can I still use this piston?
All help are gratefully received.
