A short history
I am using a factory manual for this motor!
It is a 1973 Johnson 65esl73.
It was overheated and blew the head gasket by #2 cylinder and slightly bowed the head in the middle.
A new water pump/thermastat as well as grometts for the the high presure relief valves were installed. It now has good water flow out of the discharge side(to old for a Pee-hole) as well as the exhaust manifold stays cool enough to the touch.
The head was lapped on a plate of glass to the point were a .003 (the smallest I had) feeler guage could not slide under the straight edge, and with the new head gasket I get about #130 on all three cylinders.
area's of concern still.
Two of the coils each had a small crack in the green plastic case. Both cracks were sealed up with High temp Black Silicone.
The overheat caused two drips of melted plastic (?) to drip down from under the flywheel where the stator is situated. The drip spots looked like grease but was harder so I am usuming it is a melted plastic type product.
So before discovery of the head gasket the boat saw water several times. The first ride it overheated thus the waterpump repair was performed.
After the water pump was fixed it hit the water again but never seemed to run real good. It also did not want to idle and I would need to choke it to restart it even after it was warmed up. During these trial runs the head gasket gave out thus the new head gasket work.
So my routine is to run around the lake at planing speed and not back of the gas too close to idle until I am near the dock. I stop and restart the motor only after I have pulled up next to the dock incase she won't restart.
So that is what I was doing last night and she was performing really well. Several time I docked shut her down and she started right back up without the choke and idled as she should so me and the dog launched again to do more around the lake trials.
The final lap was at WOT for about 10 min before we docked with a short no wake speed as we aproached the dock. I decided to go one more time but this time she needed the choke to start and had a low idle and died when she was put into gear. I was able to get her to start again on full choke but her idle was real low and she died on her own. So I went home.
At home on the muffs she started right up and sounded strong again. The ride home was around 20min.
In the driveway I checked her plugs and all three looked the same and were clean and dry. ( I used new plugs) I checked the compresion and had #130 across all three cylinders.
I dont think it is the head with it having such good compresion. I do not think the exhaust manifold was warped in the overheat becouse I cannot find any indication of water on the plugs. Though maybe i should be checking something else to tell if the exhaust manifold is my problem?
Could my problem be heat related? Like something that will only shows up when the engine is at opperating temps?
It was really running like a new motor for over 2 hours mostly at 3/4 throttle, the throttle was high and low but mostly 3/4 except for the final WOT run.
Thanks
Steven
I am using a factory manual for this motor!It is a 1973 Johnson 65esl73.
It was overheated and blew the head gasket by #2 cylinder and slightly bowed the head in the middle.
A new water pump/thermastat as well as grometts for the the high presure relief valves were installed. It now has good water flow out of the discharge side(to old for a Pee-hole) as well as the exhaust manifold stays cool enough to the touch.
The head was lapped on a plate of glass to the point were a .003 (the smallest I had) feeler guage could not slide under the straight edge, and with the new head gasket I get about #130 on all three cylinders.
area's of concern still.
Two of the coils each had a small crack in the green plastic case. Both cracks were sealed up with High temp Black Silicone.
The overheat caused two drips of melted plastic (?) to drip down from under the flywheel where the stator is situated. The drip spots looked like grease but was harder so I am usuming it is a melted plastic type product.
So before discovery of the head gasket the boat saw water several times. The first ride it overheated thus the waterpump repair was performed.
After the water pump was fixed it hit the water again but never seemed to run real good. It also did not want to idle and I would need to choke it to restart it even after it was warmed up. During these trial runs the head gasket gave out thus the new head gasket work.
So my routine is to run around the lake at planing speed and not back of the gas too close to idle until I am near the dock. I stop and restart the motor only after I have pulled up next to the dock incase she won't restart.
So that is what I was doing last night and she was performing really well. Several time I docked shut her down and she started right back up without the choke and idled as she should so me and the dog launched again to do more around the lake trials.
The final lap was at WOT for about 10 min before we docked with a short no wake speed as we aproached the dock. I decided to go one more time but this time she needed the choke to start and had a low idle and died when she was put into gear. I was able to get her to start again on full choke but her idle was real low and she died on her own. So I went home.
At home on the muffs she started right up and sounded strong again. The ride home was around 20min.
In the driveway I checked her plugs and all three looked the same and were clean and dry. ( I used new plugs) I checked the compresion and had #130 across all three cylinders.
I dont think it is the head with it having such good compresion. I do not think the exhaust manifold was warped in the overheat becouse I cannot find any indication of water on the plugs. Though maybe i should be checking something else to tell if the exhaust manifold is my problem?
Could my problem be heat related? Like something that will only shows up when the engine is at opperating temps?
It was really running like a new motor for over 2 hours mostly at 3/4 throttle, the throttle was high and low but mostly 3/4 except for the final WOT run.
Thanks
Steven
