Replace a stator on 50 hp 1973 johnson..CAN THIS NEWBIE DO THE JOB?

[browns]

hi, ok, so i have used this site to figure out what appears to be a stator problem... I am going to replace it... Can someone walk me thru the process from removing the flywheel , replacing the stator and putting the flywheel back on... i have replaced the rectifier, power pack and some other minor work, and think i can pull this one off... any help? tx a bunch

 

[iwombat]

Re: Replace a stator on 50 hp 1973 johnson..CAN THIS NEWBIE DO THE JOB?

You'll need to get a harmonic balancer puller (auto parts store). You have one, or know how to use it?

 

[browns]

Re: Replace a stator on 50 hp 1973 johnson..CAN THIS NEWBIE DO THE JOB?

i can get one... i have a general sense of how they work, though i have never used one myself...

 

[HighTrim]

Re: Replace a stator on 50 hp 1973 johnson..CAN THIS NEWBIE DO THE JOB?

So it was the stator eh, good. You will also need a torque wrench to re install the flywheel, and a manual would help your first time. BUt like IW said, you need the puller first.

 

[iwombat]

Re: Replace a stator on 50 hp 1973 johnson..CAN THIS NEWBIE DO THE JOB?

First you'll need to remove the keeper nut from on top of the flywheel. If you've got an air gun it's pretty easy. If not you'll need to use a strap-wrench or you can also put it in forward gear and use a block of wood to stop the prop from turning. If you think your prop hub isn't up to the task, I'd go the strap wrench route.

Once that's off, you can employ the puller. You'll thread the hardened screws into the holes in the flywheel and tighten the center bolt. Make sure the screws are well seated in the threads 1/2"-3/4" should do the trick. You may have to tighten that center bolt quite a bit. The flywheel will come off with a nice "pop". Once you lift that off, you'll see a keyway in the shaft that mates up with a slot in the flywheel (remember this for when you put it back on). Looking under the flywheel, it'll be pretty straight forward what you need to do to replace the stator.


Before putting the flywheel back on, clean off the crankshaft and keyway. Then align the flywheel and slide it back on. Be sure to torque the flywheel keeper nut down the the specified value. Skipping the torque step will sheer your flywheel key when you go to start it up next.

 

[browns]

Re: Replace a stator on 50 hp 1973 johnson..CAN THIS NEWBIE DO THE JOB?

i did the blow dryer test 4x and the motor started and then conked out afte about 4 seconds... each time... with regards to putting the flywheel back on... first of all what is the torc needed for this? i don't ahve the service manual yet... also, what about the timing marks... ? how do i address that.?


tx again for all you guys' help... i have learned a lot this past week...

 

[HighTrim]

Re: Replace a stator on 50 hp 1973 johnson..CAN THIS NEWBIE DO THE JOB?

Before re install , check crankshaft and flywheel tapers for any traces of oil. This assembly must be perfectly dry. Swab tapered surfaces with solvent and blow dry with compressed air gun. Then inspect both tapers for burrs and nicks or abrasions. Replace the flywheel and nut but do not torue it down yet. First check for spark using a spark tester with the gap set to 7/16 of an inch. If the spark jumps it with a bright blue ZAP!!, tighten nut to torque specified in your manual, Im not sure what yours should be. Timing adjustment is made with a timing light. If the timing is off, a readjustment of the full advance stop screw is required.

 

[iwombat]

Re: Replace a stator on 50 hp 1973 johnson..CAN THIS NEWBIE DO THE JOB?

Even at low rpms like on a spark test that flywheel can sheer a key if not properly torqued. Don't ask me how I know.

 

[HighTrim]

Re: Replace a stator on 50 hp 1973 johnson..CAN THIS NEWBIE DO THE JOB?

That is good to know, Ive always followed this procedure that has been in my manuals. Would there have been any other "pros" to writing this step into the flywheel re install procedure other than saving time of re pulling it if the spark is off?

 

[iwombat]

Re: Replace a stator on 50 hp 1973 johnson..CAN THIS NEWBIE DO THE JOB?

Not that I can think of, and with a rattle gun to take it off the savings is minimal at best.

 

[iwombat]

Re: Replace a stator on 50 hp 1973 johnson..CAN THIS NEWBIE DO THE JOB?

The other gotcha is that it's pretty easy to forget you haven't torqued it down properly after you've performed the test and inserted the plugs and put away the tester, and . . .

Don't ask me how I know that one either. I just torque it down properly as soon as it goes on now.

 

[rolmops]

Re: Replace a stator on 50 hp 1973 johnson..CAN THIS NEWBIE DO THE JOB?

Hello Brown.
This is one thing I would not do by myself.Not because it is so difficult,but because In Webster you can go to Bill Mayer at Mayers marina and ask old Bill if he can please pop the flywheel off for you.Just come with the cowling off the engine and the nut already removed.Tell him that you are trying to learn and you have to replace the stator.He might even hook you up with a good used one.If you buy a stator from him he probably will not charge you for popping the flywheel which he will do in 2 or 3 minutes at most
The marina is next to the bridge across the channel between Irondequoit Bay and the Lake.
Good luck.

 

[browns]

Re: Replace a stator on 50 hp 1973 johnson..CAN THIS NEWBIE DO THE JOB?

tx a bunch... should i call him up...set it up...? he has stators there? tx for your feedback

 

[rolmops]

Re: Replace a stator on 50 hp 1973 johnson..CAN THIS NEWBIE DO THE JOB?

You can give him a call at 323-1010 and ask when he will have time.He is usually in 7 days a week from 10 or 11 until 6 in the evening.