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Bolens 1886 with K486 Charging issues

5603 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.
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Thanks everyone for your input.

I have determined that 3 out of 4 diodes in the rectifier are not working.

The recitifer is a "bridge" rectifer and another member has provided me with some insight.

I have just purchased 4 new diodes and I am just about to install them into the rectifier.

Total cost for the diodes $8.

A new recitifer is +$300.

I will let everyone know if this works.
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The 4 new diodes did the trick. Installed them into the regulator/rectifier and we are now charging.

A new rectifier was quoted over $300.

4 diodes, $8.

I want to thank member larrybl for his help. He provided me with a circuit diagram to properly install the diodes into their respective spot. As 3 out of the 4 diodes were burnt we could not determine which one are positive or negative.

If anyone wants to know how I accomplished this task send me a PM.
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