Balancer shaft chews through oil/coolant seals - issue plagues 2017+ Dukes - KTM Duke 390 Forum
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post #1 of 21 Old 04-21-2019, 04:14 AM Thread Starter
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Balancer shaft chews through oil/coolant seals - issue plagues 2017+ Dukes

Hi all,


I just got my bike back from the dealer after about 3 weeks in the shop.


I was changing oil, and saw it was very milky when I drained it. I put the drain plug back in, put some of the oil into a plastic container for the dealer to verify, and called my insurance company to tow it.


Tow truck picked it up, drove about 80 miles to the nearest dealer, and dropped it off. Side note: it pays to pay that $8 roadside assistance charge for your insurance! It would've cost me at least $100 to tow it myself.


Dealer said the balancer shaft frequently chews through the seals that separate the oil and coolant reservoirs on 2017-2018 Duke 390s. They also said two more bikes came in a few days before they got mine in, with the same issue.


So FYI to all of you with 2017+ bikes out there, especially the 2017-2018 MY, you might run into this issue sooner or later. Just keep an eye out on your coolant levels in the overflow reservoir, and if it starts going down more than once, definitely check oil.


Dealer reassured me it should be much better now, which of course it should, duh.


Let me know if anybody has any questions.
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post #2 of 21 Old 04-21-2019, 05:18 AM
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Hi there

Thanks for this information. Can you advise how many miles/km were on your bike when this fault occurred?

Thanks.
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post #3 of 21 Old 04-22-2019, 12:46 AM Thread Starter
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I think it started consuming coolant at about 1000 miles on the odometer. But I only found the issue at 1800 miles.
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post #4 of 21 Old 04-22-2019, 03:06 AM
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Handy information to have thank you for keeping everybody updated , don't suppose you could get mileage data from those other two bikes . Anybody else out there experienced the same problem ? If so at which distance can we find out if it was a bad batch of seals or is it common to all ? Lightning don't panic yet the other problem with internet forums is the paranoia that makes you think all the bad things are going to happen to your bike .
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post #5 of 21 Old 04-22-2019, 04:15 AM
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I think the problem will be another than the balancing shaft as there is no oil/coolant separation at this shaft?

As long as you are happy with what you ride.
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post #6 of 21 Old 04-22-2019, 11:51 PM Thread Starter
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Quote:
Originally Posted by KTMasean View Post
I think the problem will be another than the balancing shaft as there is no oil/coolant separation at this shaft?
What do you think drives the water pump?
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post #7 of 21 Old 04-24-2019, 06:02 AM
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Any more details? What is the cause and the fix?

2018 390 Duke with knobbies
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post #8 of 21 Old 04-25-2019, 12:58 AM Thread Starter
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The cause was the balancer shaft chewing through the seal. They fixed it by removing the engine, disassembling it, replacing the balancer shaft, and putting everything back together.
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post #9 of 21 Old 04-25-2019, 03:36 AM
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Quote:
Originally Posted by varroa View Post
The cause was the balancer shaft chewing through the seal.

Thatís not exactly a technical explanation and doesnít explain what the fault was. What caused the balance shaft to damage the seal?
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post #10 of 21 Old 04-25-2019, 07:15 AM
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I’m not sure that this issue “plagues” the 2017 onwards 390 Duke
As the O/P is the only one to have found and reported it. But it’s something to be aware of.
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