Coolant pump leak - MVAgusta.net
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post #1 of 33 (permalink) Old 11-27-2013, 03:09 AM Thread Starter
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Coolant pump leak

Just when I though it was all coming together I notice white stuff around the side stand, below the coolant pump etc.

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Is it going to be obvious when I pull the pump off which seal has gone ?
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post #2 of 33 (permalink) Old 11-27-2013, 05:37 AM
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It is the mechanical seal in the pump.
It could just be weeping a bit from drying out if the bike has sat unused for a length of time. Might heal itself, or will get worse in a hurry. You could try some "stop leak" as a cure.
Believe it or not, the major manufacturers all put stop leak in their new engines at the assembly line as a front line defense against minor leaks while cooling system components "bed in". I know this because I have seen it being done.

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post #3 of 33 (permalink) Old 11-27-2013, 05:42 AM Thread Starter
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Sitting still is not on this bikes list of things to do, I've added 20000km to it this year already.

It got worse today. Looking back at a pic from a couple of weeks ago there were a few tell tell signs of white. Do these things really let go and dump coolant over the back wheel when moving ?
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post #4 of 33 (permalink) Old 11-27-2013, 05:50 AM
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It will start pissing coolant pretty well as it fails but air flow tends to keep it from coating the tire. None the less, you should fix it now. Even if the tire doesn't get slippery the engine will start to overheat.

Not very expensive and not very difficult.

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post #5 of 33 (permalink) Old 11-27-2013, 05:57 AM
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not the best thing for the electrical connections/side stand switch either guys ..
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post #6 of 33 (permalink) Old 11-27-2013, 09:29 PM
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This seems to be a common issue this fall for some reason. Depending on the model year of your bike and the seal type this could be a very easy fix.
I just completed the repair on my 2008 F4 312R for a leaking coolant side seal. The coolant was exiting from the weep hole located between the oil seal and the coolant seal.
If you can post up a picture of your water pump and year of your bike I might be able to help you out. The coolant side seal for the 2008 F4 is a 28 X 12 X 8 mm. Correction! The stock seal is 28 X 12 X 7mm, I checked this after I removed the stock seal.
If yours is the same try an auto parts store and if they can't help you I can send you one.

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Last edited by Sagerider; 12-08-2013 at 01:23 AM.
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post #7 of 33 (permalink) Old 11-27-2013, 09:32 PM Thread Starter
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Thanks, it's a Brutale, 2008 910R ( euro3 with the twin fans, later ecu etc). I'll probably drain the coolant and pull it apart tonight.
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post #8 of 33 (permalink) Old 11-27-2013, 09:35 PM
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Noel or Carl? Does this bike have the same coolant pump as the 2008 F4?
Help may be on the way.

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because they would have ignored the apple and eaten the snake!
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post #9 of 33 (permalink) Old 11-27-2013, 10:20 PM
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Should be the same as my 1078 just take the bearings and seals to a good bearing shop ,got the lot up in Brisbane from pine river bearings 30 bucks all up approx
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post #10 of 33 (permalink) Old 11-28-2013, 09:33 AM
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All the pre-2010 use the same basic pump. There was an upgraded impeller and cover on later F4s which is available as a kit to retro fit older bikes. The pump shaft, bearing and seal configuration changed around 2007 or 8, but the seal remains the same if I recall. Pretty simple repair.
Do a thread search on water pump upgrades for more info.

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