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Blew the coil on the Bolens 800 today


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#1 Bolens 1000 ONLINE  

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Posted April 28, 2011 - 07:00 PM

The lawn needed its first mowing of the season, Usually I use the 850 or 1050 but,
since most of the Bolens fleet is in need of repair (850 needs transmission swap) (1050 has the tiller mounted on it and I didnt want to take it off) ( I used the red and black 900's brake system and put it on the 800)

So the only 1 that was ready to go was the 63' 800. I bought a used coil yesterday and put it on the 800. I got the mower deck on and began mowing the grass. About 10 minutes into mowing I smell a burning smell and white smoke starts pouring out of the hood. I thought I caught a battery again on the pulley. I stop the tractor, open up the hood and find oil all over the engine. The coil was squirting out oil all over the place.:mad2:

I had to go back and steal another coil off another Bolens to get her home.

I also replaced the axle seals again that were leaking.
And towards the end of mowing the tranny started acting up.
when you are driving (mostly in 2nd gear) the best way to describe this is it's kind of jerking along. Almost seems like one wheel is hesitating to move.
I dont know what is causing that :confuse:

Its been a bad couple weeks for my Bolens lately LOL.

Attached Thumbnails

  • blown coil 001.jpg
  • blown coil 002.jpg


#2 bread320i OFFLINE  

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Posted April 28, 2011 - 07:09 PM

wow never seen that happen.

#3 DougT ONLINE  

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Posted April 28, 2011 - 09:23 PM

There are 2 things to suspect when you see this happen. Either you don't have a resistor in the wire to the coil and your feeding full battery voltage or the points are staying closed too long. (too much dwell) What happened to the original coil? Did it do the same thing? Some coild have an internal resistor and some don't. Maybe you got the wrong one?

#4 Bolens 1000 ONLINE  

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Posted April 28, 2011 - 09:36 PM

Yeah, I was aware of the 2 different types of resistors. The Tractor came in pieces so it didnt have a coil with it. I borrowed a coil out of another tractor I had and it was fine. I just installed this one today and it lasted about 10 minutes.
I just think I bought a fried coil

#5 DougT ONLINE  

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Posted April 28, 2011 - 10:04 PM

Hard to say at this point. I'd think if it was pre-fried it wouldn't have run right off the bat.

#6 WQDL753 OFFLINE  

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Posted April 29, 2011 - 12:09 AM

There are 2 things to suspect when you see this happen. Either you don't have a resistor in the wire to the coil and your feeding full battery voltage or the points are staying closed too long. (too much dwell) What happened to the original coil? Did it do the same thing? Some coild have an internal resistor and some don't. Maybe you got the wrong one?

:ditto:
I would say either a shorted, or lack of, a resistor.
You might also want to check for signs of excessive current on the primary wires, and the points.
Enugh power went through the coil to heat the oil to the point of rupture, there's bound to be collateral damage...

#7 jupiter OFFLINE  

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Posted April 29, 2011 - 03:18 AM

See what happens when you smoke. Sorry, I could not resist. The coil and tranny. Thats a double wammy. Sorry to hear the old girl is sick. She look great for her age. Could it just be clutch slippage you were feeling?

#8 DGS345 OFFLINE  

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Posted April 29, 2011 - 06:49 AM

The lawn needed its first mowing of the season, Usually I use the 850 or 1050 but,
since most of the Bolens fleet is in need of repair (850 needs transmission swap) (1050 has the tiller mounted on it and I didnt want to take it off) ( I used the red and black 900's brake system and put it on the 800)

So the only 1 that was ready to go was the 63' 800. I bought a used coil yesterday and put it on the 800. I got the mower deck on and began mowing the grass. About 10 minutes into mowing I smell a burning smell and white smoke starts pouring out of the hood. I thought I caught a battery again on the pulley. I stop the tractor, open up the hood and find oil all over the engine. The coil was squirting out oil all over the place.:mad2:

I had to go back and steal another coil off another Bolens to get her home.

I also replaced the axle seals again that were leaking.
And towards the end of mowing the tranny started acting up.
when you are driving (mostly in 2nd gear) the best way to describe this is it's kind of jerking along. Almost seems like one wheel is hesitating to move.
I dont know what is causing that :confuse:

Its been a bad couple weeks for my Bolens lately LOL.

http://www.youtube.com/watch?v=ge6yUdYZsqc&feature=channel_video_title


Sorry for your troubles. And I feel your pain. hope your fleet is tip top ASAP

#9 Bolens 1000 ONLINE  

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Posted April 29, 2011 - 06:50 AM

I dont really think any damage was done. After I put the other coil on it ran fine for the remaining 20 minutes I used it.

It may have just been the wrong coil like you said because when I felt the other coil When I was done it was only luke warm. The one that blew up was really hot.

#10 mjodrey OFFLINE  

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Posted April 29, 2011 - 07:58 AM

Glad to hear there was no damage.

#11 KennyP OFFLINE  

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Posted April 29, 2011 - 08:27 AM

That is something I have never seen happen before. Guess there is a first time for everything. Hope you get it figured out.

#12 Bruce Dorsi OFFLINE  

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Posted April 29, 2011 - 08:55 AM

And towards the end of mowing the tranny started acting up.
when you are driving (mostly in 2nd gear) the best way to describe this is it's kind of jerking along. Almost seems like one wheel is hesitating to move.
I dont know what is causing that :confuse:


Brian, one possibility is that the flanged coupling on the input shaft of the transmission has stripped its splines. .....This is the flange that is between the rubber drive coupling and the input shaft of the trans. ......The cast-iron flange is softer than the steel trans input shaft, and usually (hopefully) the input shaft is not damaged. ......When this happens, the splines can grab-then-release, causing the drive to slip/jerk.

Is the rear axle end-play adjusted correctly? .....If it's not, the drive gear can jump teeth, and jerk like that.

You can try locking the differential to see if the jerking goes away, or gets worse. ......Does it also jerk in 1st & 3rd gears?
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#13 Bolens 1000 ONLINE  

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Posted April 29, 2011 - 10:12 AM

I did try and drive it around with the differential turned all the way in and it is the same jerking motion.
I guess I'll have to pull the cover off and take another look.
It was jerking in all gears but 2nd seemed to be the worst for some reason.

#14 MH81 ONLINE  

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Posted April 29, 2011 - 11:27 AM

Is it possible you got a 6 volt coil? Last time I saw one melt down like that, it was a 6v with no dropping resistor.

Glad the other coil worked!

Good luck on the jerking.

#15 Bolens 1000 ONLINE  

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Posted April 29, 2011 - 03:41 PM

It came off a another Bolens so I doubt it was a 6vt coil. The coil looked original to me

I bought a new one today. Here's a picture of it.
I think its the right one LOLcoil 002.jpg




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