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Alternator belt snapped

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13 Apr 2020 07:48 #221021 by jfkenpoman
Just got into work noticed lights dimming and battery light on, checked and the alternator belt snapped, overflow bottle came off mounting and sprayed contents on engine. Will I be able to drive jimny home, 25 miles if I top up overflow bottle. I've just had the water pump replaced and a belt changed but haven't driven it for a couple of weekdue to being ill. Now back at work.
Regards
Jon

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13 Apr 2020 09:30 #221026 by me101
Replied by me101 on topic Alternator belt snapped
Even with a fully charged battery, don't think you would get home with no alternator.

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13 Apr 2020 09:49 #221028 by jackonlyjack
Lack of water being pumped round is the major issue
cooked engine = _____ engine :(

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13 Apr 2020 11:07 #221030 by me101
Replied by me101 on topic Alternator belt snapped
Didn't think of that, thought that was on the other belt!

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13 Apr 2020 12:02 - 13 Apr 2020 12:05 #221032 by Scimike
Replied by Scimike on topic Alternator belt snapped
You will be surprised how far you can travel without an alternator so long as you turn everything you can off. 25 miles is no problem, and it should easily keep an engine running for a few hours. I traveled around France with a chap on a Yamaha TDM with a failed alternator, we strapped a car battery to the rack and charged it each night to keep him going. Thinking about it, was this possible the first plug in hybrid :laugh:
That said, this nugget of info is no help as 25 miles without cooling is too much to ask.
Time for a tow or road side repair.
Mike
Last edit: 13 Apr 2020 12:05 by Scimike.

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13 Apr 2020 14:49 - 13 Apr 2020 14:52 #221036 by walesy
Replied by walesy on topic Alternator belt snapped
Been there. about 2 miles with no belt if you're lucky. Country lane no traffic. Had to get it recovered the night before. Drove it to my local garage for new pulley and belts the next morning. Needle was heading into the red when i got there.
Was the old belt squealing before it snapped. Could be the crankshaft pulley causing the belt to snap.
Last edit: 13 Apr 2020 14:52 by walesy.

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14 Apr 2020 08:26 #221060 by Fossie
Replied by Fossie on topic Alternator belt snapped
Obviously you've got home now ...or wild camping!
My reason for reply is just that this happened a few times to my daughters Jimny, she made it home every time . Every time another item was checked in the belt system...finally it turned out to be the alternator, it charged fine seemed ok but eventually we found that a bearing in it had siezed meaning the belt dragged the pulley rather than pulled it....an external inspection of the belt looked fine but underside burnt and worn.

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19 Apr 2020 09:55 #221262 by jfkenpoman
Replied by jfkenpoman on topic Alternator belt snapped
morning guys, sorry its taken so long to reply very long days at work not been on pc. so had the jimny taken to garage on bank holiday, good news, luckily I didn't cook the engine, bad news the alternator would spin upon startup however after about 10 minutes of running was seizing up, causing the belt to spin, get hot and then actually melting before actually braking. so a lot of money later I now have a working jeep, new belts, alternator, and new water pump...…..hopefully all good . ive ben to work for the last 5 days in the jinmy 40 miles a day, levels all constant, happy but skint man
The following user(s) said Thank You: Scimike

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19 Apr 2020 15:00 #221268 by Scimike
Replied by Scimike on topic Alternator belt snapped
Thanks for taking the time to report back, pleased it's now sorted.
Interesting that its the alternator, in my limited time on the forum it's now 50/50 on belt failure being caused by the rubberised bottom pulley and alternator. Definitely worth knowing.
All the best
Mike

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19 Apr 2020 15:22 #221269 by jfkenpoman
Replied by jfkenpoman on topic Alternator belt snapped
thats exactly what happened to mine, all hopefully helping out others if it occurs with their jimny

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19 Apr 2020 16:41 #221272 by facade
Replied by facade on topic Alternator belt snapped
My alternator seized up a couple of times, right after start-up.

Drop the belt and it was free to turn by hand.

Turns out it was rust! The stator goes rusty, and bits flake off. When the alternator starts and tries to run full chat, it attracts the flakes into the gap between stator & rotor, and jams it. Cut the power and you can turn it by hand.

When it went round it charged fine, so it seemed a bit of a waste to replace it, but I did and it was no more trouble- until the bottom pulley fell apart a couple of years later.....

If it suddenly breaks, go back to the last thing that you did before it broke and start looking there :)

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