JOHNSON 115 1979 STATOR REPLACEMENT

[breezland]

I have had many problems which i have finally attributed to a bad stator. Due to signs of the insulation melting off under the flywheel, and because it is the final thing i have not been able to rule out. I could not figure all the testing procedures in the manual. anyway i m going to replace. I have a wheel puller and a torque wrench. Is there any other advise or tools i may need? I am hoping to see an immediate correction of my problems once i replace am i correct?

 

[ajp]

Re: JOHNSON 115 1979 STATOR REPLACEMENT

If that is the problem. I have a buddy with a 74 rude 115hp and the charge coils are oozing green slime. He has no spark and thinks this may be the problem. I am not completely sure. <br /><br />You will need some locktight. It is really easy to remove and replace. I would check www.seilermarine.com for a good price.

 

[Hooty]

Re: JOHNSON 115 1979 STATOR REPLACEMENT

I don't know what kind of wheel puller you have but don't grab the flywheel on the ring gear. Use the three holes towards the center. I think those take 5/16-24 bolts. A 1/2" drive air impact wrench is real handy too.<br /><br />c/6<br /><br />Hooty

 

[ajp]

Re: JOHNSON 115 1979 STATOR REPLACEMENT

Yep 5/16" Fine thread bolts.

 

[Joe Reeves]

Re: JOHNSON 115 1979 STATOR REPLACEMENT

Crab... The stator is a dual purpose component, AC charging voltage, and 300v power supply to the powerpack(s). If/when the stator starts to leak/melt down, the voltage to the powerpack(s) drop resulting in the pack not firing properly.<br /><br />Bottom line... When a stator starts to melt down, replace it even if you obtain the proper readings.<br /><br />Note that on the lower amp charging stators such as a 6, 9, 10, whatever, (anything other than the 35amp stators which melt down due to excess heat), the cause of the melt down is usually due to a faulty rectifier.<br /><br />A rectifier can be damaged by reverse polarity such as hooking up a battery or battery charger backwards, even momentarily. This disables the rectifier and eliminates its ability to convert the AC voltage to DC which is needed to charge the battery. The result is that the voltage backs up in the stator and eventually causes it to crack and melt down. You can test the rectifier as follows:<br /><br />(Small Rectifier Test)<br /> <br />Remove the rectifier wires from the terminal block. Using a ohm meter, connect the black lead of the ohm meter to the rectifier base (ground), then one by one, connect the red lead of the ohm meter to the yellow, yellow/gray, then the red wire (some rectifiers may also have a yellow/blue wire. If so connect to that also). Now, reverse the ohm meter leads and check those same wires again. You should get a reading in one direction, and none at all in the other direction. <br /><br />Now, connect the black lead of the ohm meter to the red wire. One by one, connect the red lead of the ohm meter to the yellow, yellow/gray, and if present, the yellow/blue wire. Then reverse the leads, checking the wires again. Once more, you should get a reading in one direction and none in the other. <br /><br />Note that the reading obtained from the red rectifier wire will be lower then what is obtained from the other wires. <br /><br />Any deviation from the "Reading", "No Reading" as above indicates a faulty rectifier.

 

[breezland]

Re: JOHNSON 115 1979 STATOR REPLACEMENT

thanks for all the info i will have to print all that info out and have it handy when i replace. i just ordered the stator from an aftermarket place $199. i saved $25, or did I? Is there any reason i should have stayed away from the aftermaket parts for a stator i hope not because it is already on its way. I have to make a quick trip fo Florida this week and will replace when i return. thanks again for all the info the last thing i need is to have the new one melt. i hope this will finally fend my search for the mysterious sputtering and save me alot of headaches.