2004 Brutale 750 Oil leak - MVAgusta.net
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post #1 of 11 (permalink) Old 03-22-2017, 08:28 PM Thread Starter
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2004 Brutale 750 Oil leak

Just picked this bike up and noticed its got a pretty good oil leak on the left side. Does anyone recognize this mess and where it could be coming from. Many thanks

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post #2 of 11 (permalink) Old 03-22-2017, 10:39 PM
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Possibly just chain lube....but also could be the sump gasket. The side stand bolts into it. Known source of leaks. Check the sump pan bolt tightness.

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post #3 of 11 (permalink) Old 03-23-2017, 04:07 AM
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The first two photos show source of oil coming from above the messy area, so +1 for me on chain lube, or perhaps countershaft seal (but this is a pure guess as I don't know if this is common on MVs).

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post #4 of 11 (permalink) Old 03-23-2017, 09:12 AM
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My 750 F4 did the same (same engine) , it was the sump gasket and needed a new one. It was the MOT station that caused it as they tilted the bike on the side stand to raise the rear wheel to check for play. Was not happy and never went to the MOT station again.

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post #5 of 11 (permalink) Old 03-30-2017, 05:51 PM
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Thumbs up leaky bitch?

my vote.....countershaft nut isn't torqued correctly

oil is too high up for it to be the pan gasket


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post #6 of 11 (permalink) Old 05-02-2017, 10:42 AM
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I had that mess, for me it was the water-pump O-ring, I got the proper size from a hardware supplier, stopped the leak. You can remove the water pump without having to disconnect/drain the coolant. To check, take off the bolts holding the pump in place, pull the thing out to see if that's the source of your leaks.
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post #7 of 11 (permalink) Old 05-02-2017, 10:43 AM
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Although I do have to say, that looks like chain lube lol
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post #8 of 11 (permalink) Old 05-03-2017, 06:44 PM
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Best thing to do would be to clean the mess up, and then start over.

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post #9 of 11 (permalink) Old 05-03-2017, 09:57 PM
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Agree with Donsy, give everything a good clean first. I had a similar problem on my 910S and initially thought it was too much chain lube but turned out that was just the clean engine oil mixing with dirty chain lube, becoming black in the process and getting flung everywhere.

I also pulled my countershaft/front sprocket cover and degreased behind there.

Turned out I had two problems, the first slightly unusual and almost certainly originated at build. The slots on the front sprocket nut lock washer were slightly misaligned with the countershaft splines during assembly and partly folded over as the nut was tightened. The effect of mangling the lock washer prevented the full torque being applied to the nut, only the lock washer tab prevented the nut from coming undone. When I knocked back the tab the nut was just finger tight. Having gone that far I changed the countershaft seal and reassembled everything to find the leak returned, albeit reduced.

I also had a leaking sump gasket, split right next to where the side stand mounts. I pulled the sump, cleaned everything up and used Toyota liquid gasket on reassembly. No more leaks. Hope this helps.
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post #10 of 11 (permalink) Old 05-04-2017, 12:36 AM
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Thumbs up ?

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At a correctly applied 140 Nm, a slight misalignment of the lockwasher won't matter....... it'll seal


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