Leaky Sump - 2018 KTM 790 Duke Forum
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post #1 of 17 (permalink) Old 08-22-2018, 06:03 PM Thread Starter
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Leaky Sump

So at 500k i noticed a bit of oil around the front of the sump, it looked to be leaking through the gasket.

I pinched up the three sump bolts at the front and all seemed good.

At 1000k my dealer snugged up ALL the sump bolts.

At 1200k I noticed leaking at the rear of the sump.

My dealer has ordered a new gasket which is going to take around four weeks to get to Australia as there are basically no spare parts in Aus yet.

Anyway just a heads up, you might want to eyeball your sump gasket for any dampness.
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post #2 of 17 (permalink) Old 08-24-2018, 06:13 AM
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Hi DukeAus, over at that other forum I commented that I wasn't having any leakage problems but I took the bike for a 300 km ride today and I find that I also have a problem.



Oil mist at the front of the sump and weeping along the left side enough to form droplets of oil, definitely not from the chain, also note oil mist on the right side every couple of inches.


Really really pissed off to be honest, this is a really simple design problem that doesn't happen to bikes these days and hasn't happened since the days of Triumph back in the 60's.


The other thing that pisses me off is these bikes have been on sale for over 3 mths in Europe where this problem is apparently becoming obvious and yet KTM Australia chose to import bikes for sale in Australia knowing they have a oil sump design problem, says a lot about KTM Australia actually.
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post #3 of 17 (permalink) Old 08-26-2018, 07:10 AM
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as an early buyer of the 790 I sort of expected teething issues, when It comes to oil leaks I can say my sump is dry but I have very slight misting of oil from the LHS engine cover near the alternator wire grommet
My new 1050 speed triple had porous main engine casings so bad they swapped the bike after 6 months this was due to the high pressure casting technique used not being 100% it is possible as these engines also use high pressure engine castings it might be KTM are having similar issue
No one stopped buying Triumphs with the 1050 engines but it did mean a numbers of owners had issues
I also had both fork seal go on my triumph in the first 3000 miles

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post #4 of 17 (permalink) Old 08-28-2018, 08:07 AM Thread Starter
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I agree its pretty bloody annoying.

I guess ill just wait and see if a new gasket fixes things up tho unless they have changed the gasket design or material i dont see how it will be any different.
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post #5 of 17 (permalink) Old 08-28-2018, 12:00 PM
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don't give up hope YET! :-)

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post #6 of 17 (permalink) Old 08-31-2018, 05:59 AM
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In my case when I was running it in there was only just a slight mist at the front on the LHS, but then after the 1st service when they changed the oil to Motorex 10/60 I had a 150 km ride home from the dealer and there was heaps of oil from the LHS front and along the side back to the sprocket cover - by heaps I mean maybe 25 - 50 ml. I initially wondered if the dealer mechanic had forgotten to replace a seal, it really was that bad, so the viscosity of the oil had a lot to do with the leak.


Interestingly now each time I ride the bike there seems to be less and less oil weeping, especially now that I've introduced the engine to the little red light it's reached the point where I wouldn't be too concerned about doing a 1,000 km weekend ride nor worry about carrying any oil for a top up, just give the LHS sump a quick wipe when getting fuel.

I think I will wait for while and see what happens, maybe there will be a recall (unlikely), maybe KTM will do something (unlikely) or maybe software update V2.0 may have something to do with it.
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post #7 of 17 (permalink) Old 09-03-2018, 06:13 AM Thread Starter
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My local dealer called me today to let me know they have my new sump gasket... Ill get it fitted in the next few days and let you know if it fixes my issue.
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post #8 of 17 (permalink) Old 09-04-2018, 06:34 AM
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Quote:
Originally Posted by DukeAus View Post
My local dealer called me today to let me know they have my new sump gasket... Ill get it fitted in the next few days and let you know if it fixes my issue.

Can you ask the mechanic if he could see why there was an oil leak, was it a faulty gasket or a fault in the sump casting.


Its odd all the leaks seem to be on the LHS, sort of indicates some sort of design fault.
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post #9 of 17 (permalink) Old 09-12-2018, 04:11 AM Thread Starter
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So had a new gasket fitted yesterday and after a 4 hour hard ride today there is no sign of a leek, tho there is oil around the sump.

The dampness now seems to be coming from the front sprocket cover, hopefully just oil spray from the chain. I cant imagine it could be the crank seal already.

Interestingly KTM said that my dealer was the only dealer in Aus to order a sump gasket. moreover my dealer has only sold two bikes and both mine and the other where in for a new sump gasket on the same day!.. Weird?
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post #10 of 17 (permalink) Old 09-12-2018, 06:07 AM
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Quote:
Originally Posted by DukeAus View Post
So had a new gasket fitted yesterday and after a 4 hour hard ride today there is no sign of a leek, tho there is oil around the sump.

The dampness now seems to be coming from the front sprocket cover, hopefully just oil spray from the chain. I cant imagine it could be the crank seal already.

Interestingly KTM said that my dealer was the only dealer in Aus to order a sump gasket. moreover my dealer has only sold two bikes and both mine and the other where in for a new sump gasket on the same day!.. Weird?
Glad to hear it sounds like it's sorted.
Maybe someone in the assembly plant was having a bad day.

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