1959 Johnson Fat 50

[steelespike]

Re: 1959 Johnson Fat 50

Sure sounds like a lean sneeze.you may have to clean the carbs.
Is it pumping water?
Didn't see any discharge.Be sure thje barrel is good and full.
Very good sign it will hand start.You might see if a little choke gets rid of the sneeze.

 

[coolguy147]

Re: 1959 Johnson Fat 50

ya thats a lean sneeze.

clean the carbs?

set your high speed needle at 1 out then low speed 1 1/2 turn out. make sure the lower unit is submerged in water. probably change the t stat

 

[jpwade_bsu]

Re: 1959 Johnson Fat 50

steelespike: Is it pumping water? Didn't see any discharge.Be sure thje barrel is good and full.

coolguy147: .. clean the carbs? set your high speed needle at 1 out then low speed 1 1/2 turn out. .... change the t stat

steelepike & coolguy147 your input is very much appreciated and at this point I am comfortable with the cooling system and carb adjustments. I ran her again today and she is pumping water, sneeze goes away with a slight choke, and she shifted through the gears smoothly, (still need to change gear oil)


On the 2nd startup I noted no water discharge which is why I shut her down. Took the advise and filled barrel to top. I also removed thermostat and fired her up today.

utube of fat fifty water discharge

video does not show to well but there is good water discharge and after about 5 minutes of running all heads were warm to the touch (no thermostats) Will re-insert thermostats and check water / temp again.

Sneezing:
In the utube video "fat fifty running" you can see at time interval 49seconds where I choked and throttle down motor and engine smooths out , it quit sneezing.

I will try carb adjustments and I also noted within iboats forum a post by Joe Reeves on 1959 Carb Adjustments.

Initially when i got this motor it was locked up and I have no idea how long it layed up since it last ran. It did not take much rocking of the flywheel to free up after oiling her. I am thinking as she runs a bit more and burns off the oils i pumped into her heads I will adj. carbs if needed.

Thanks bunches for the information

 

[coolguy147]

Re: 1959 Johnson Fat 50

that sounds a lot better. the water looks pretty good. again should change the impeller if not done so lately. replace thermostats with new ones too for good insurance

when you put a new impeller in and new t stats. simply pour a little water on the head BOTH side to check if steam comes off. shouldnt. then you can proceed to touching the block.

have you cleaned the carbs?

i would change the gear oil before running. gear oil is very important as i learned even when not in gear. something down there is always moving when the motor is running. check for milkyneesss. if water intrusion suggested to replace seals. and while you take it apart check gears conditions and clutch dogs

 

[Chris1956]

Re: 1959 Johnson Fat 50

JP, A Fat-Fifty has a single thermostat located in the black bakelite box in the rear of the motor. The water discharge is thru the exhaust housing and behind the prop. There is a spitter on the midsection which does have some spray exiting. There is no telltale discharge, like newer motors.

You can test the temp of the discharge to assure proper thermostat operation. The expelled water should be 140*F.

 

[jpwade_bsu]

Re: 1959 Johnson Fat 50

coolguy147: ... have you cleaned the carbs?, .... gear oil

coolguy147, have not yet cleaned the carbs, thou I did drop the gear oil and yes there is a bit of water. The motor now stored for the season here in northern minnesota, after the days of 30 deg. below zero temps pass us this upcoming winter I will start on her again. Thanks!

Chris1956: The water discharge is thru the exhaust housing

Chris, yep i noted after cleaning up and putting the thermostat back in, ... the discharge at the exhaust housing was more intermittent and lower in volume, did not test the actual temp yet thou the hand test on the heads was comfortable. I will resume work with her come beginning of spring 2010 and get some readings after she is hung on a hull and running out.

Thanks bunches,
Joe