My Tractor Forum banner

Bolens 1886 with K486 Charging issues

5598 Views 21 Replies 5 Participants Last post by  goingmach_1
Bolens 1886 with K482 Charging issues

I am doing a overhaul on the engine for my Brother-in-Law in his 1886. As it turns out I really like this machine. Its in great shape, except that the previous owner ran the engine into the ground.

My Brother-inLaw, Uncle Danny, purchased it, noticed it was making noise and took it over to your freindly neighborhood take it apart guy. After it was dismantled he determined it was going to need a couple of new rods, pistons ect. Thousand bucks ought to do it!

Well Uncle Danny packages it all up and drags it home, where it sits for 10 years. I come along and ask, "what are going to do with that?" He says get 'er going some day. We decide he will never do it, so I box up the remnats and start the process.

Remember, I did not take it apart.

Well I take the engine block over the machine shop, and the machinist just happens to really like doing old Kohler engines. He measures it all up and realize it needs the full Monty. Oversize pistons, undersize rods, new valve guides and valves, all the bearings, gaskets and seals.

It took some time to source it all but in a nut shell the engine is complete, installed and running.

But! It wont charge the battery.

It has a 30 amp alternator with a AC-DC rectifier. I did all the book procedures to test it high and low. The stator has 4 wires. 2 black AC output, and 2 red ones. The test shows 2 ohms between the black wires and that tests good, and .1 ohms over the 2 red ones, and they test out. The wires are not open and do not ground out to the stator. The regulator tests good as well.

The only issue I can see is that there is like a small piece of one of the magnets in the flywheel has flown off. There is still I'd guess a half magnet in there, it grabs metal anyway. All the other magnets are intact.

I traced all the wires through the key, amp gauge, circuit breaker, starter solinoid. Brand new battery.

Does anyone been through this before? Any ideas? Do you think the stator is toast.

I don't have a spare engine to start swapping parts out.

Thanks in advance.
See less See more
1 - 5 of 22 Posts
Well,,Im no expert on charging system but have my share of battles with them. I won them all!!

My first thought after reading your post,,,(several times).

If it has a alternator,,,,,this is where the problem lies. ( I would think)

Can you start the engine and disconnect the battery and still run??? Do the Head lights work???

I have to ask how you determined the battery is not charging??

I had a tractor in the past I did some work to the flywheel magnets(no alternator on mine) and after that the battery was low when tried to start it.

Thought I had a charging problem ,,but found out battery was being drained as it sat,,,,,,from a bad wire
See less See more
Got the new stator installed, and still no joy. It is not charging.

Looks like the missing magnet segment. I am going to have to find a hobby shop and try and widdle one into the spot that is missing.

I will post those results.
I don't believe that is the problem. But explain again about the magnets?? Half of one is missing??

If that is the case,,,it's something else. IMO. Maybe,,It's the devise/gauge you are checking it with,,,,, is faulty. Just a thought. (You should get some kind of reading.)
Thanks for your reply.

Off the stator there is 2 AC leads that go onto the regulator/recitifer marked "AC".

Off the stator there is 2 red leads, and they go onto the regulator/rectifier marked "REG", and the other "+BAT REG".

Further there is a negative wire off the regulator/recifier that says "BAT NEG" and that goes to ground.

A mechanic checked the regulator/recitfier and says there is 3 out of the 4 diodes not working.

So the question is, how do you replace diodes. Is there a + and - diode?

If so how to do you identify them. Is there a special way to install them?

It gets interesting now. I can't help you much,,because I have never had a problem with one. But aren't they a little rubber encasing on a wire??I'm not sure what goes on in there,,,,but if one is burnt,,I believe it's just like a break in the wire.
Some one will be able to help. I'll learn something here too.
Can you test it before the diode,,, and again after ,,,if results are good??

I know there is one diode coming off the coil(s). Not far from coil,,could be under the cover.

Do you any issues when turning the key off,,,does the engine die quickly??
1 - 5 of 22 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.