Wather leak, from the back of the W.Pump. - MVAgusta.net
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post #1 of 33 (permalink) Old 10-29-2013, 11:40 AM Thread Starter
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Wather leak, from the back of the W.Pump.

I got a water leak on my 312RR, it`s like a tear drop every 5 seconds. comes down from somewhere beetwen the engine case and the water pump assembly. any leads? gasket, oring maybe? I tigtheen all the bolts I can get to w/out removing any covers...
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post #2 of 33 (permalink) Old 10-29-2013, 11:49 AM
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It could be from the "cap" portion or it could be the o-rings back along the "shaft" portion that are allowing water by. Either way you are going to need to remove the pump to diagnose/solve it. Its much easier than it sounds.

Its an easy thing to fix. You can get the individual rubber pretty cheaply and once you remove the pump itself its something you can do sitting at a bench. Do it all. There are a couple of O-rings on the shaft that prevent weep into the crank case seals for the housing itself and then a sort of "seal on a spring" that goes on the actual shaft of the water pump and makes sure that the spinning pump always has a seal behind it.

Work blocks Google drive or else I could probably direct you to the parts but if you go to the parts manual on here or proitalia.com and hit up section G07.
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post #3 of 33 (permalink) Old 10-29-2013, 11:57 AM
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I'd say it's most likely that you have a leaking water pump O-ring.
This is one of the better threads on the subject:

http://www.mvagusta.net/forum/showthread.php?t=36945

Things to be aware of: Don't over tighten the 8 mm bolts that hold the impeller housing as some have stripped the threads while doing so. Also, from memory, the 1078 uses a slightly different O-ring to the previous models. Confirm this through another forum member or your local parts supplier. The O-ring is pretty inexpensive and replacing it is not particularly difficult.

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post #4 of 33 (permalink) Old 10-29-2013, 12:55 PM
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Wink

its the water pump seal, the water is coming out the weep hole

like Ryan said page G07 in the parts manual

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post #5 of 33 (permalink) Old 10-29-2013, 01:20 PM Thread Starter
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great! much appreciated for your quick reply! I looked it up at the engine manual section D19 and Im sure Ill be able to do it myself. but WHERE CAN I ORDER THE O-RINGS I NEED ON LINE? Im in uruguay and our dealer does not have any in stock.. looked up in ebay but no luck
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post #6 of 33 (permalink) Old 10-29-2013, 01:26 PM
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Unfortunately dont know the shipping situation but proitalia had that stuff in stock, but its in the US.
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post #7 of 33 (permalink) Old 10-29-2013, 01:50 PM
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same model. same symtoms. thread below

http://www.mvagusta.net/forum/showthread.php?t=28568

its been nearly 4 years and issue solved. Almost certain excess coolant quantity caused the problem. Important: make sure coolant level not at the max. In my case 1190ml of coolant was enough (radiator flashed) and problem never came back. Parts in my case came from forum vendor. Cheap prices too nothing expensive.
Hope it helps. Problem may be the same.

Last edited by PP1098; 10-29-2013 at 03:33 PM.
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post #8 of 33 (permalink) Old 10-29-2013, 05:02 PM
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Wink ?

folks the water is coming out the weep hole......O-rings won't fix it, it needs seals

Nico;
the inner O-ring keeps oil in the motor
the outer O-ring keeps water in the impeller housing

repair starts on page B68 of the engine manual

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post #9 of 33 (permalink) Old 10-29-2013, 09:52 PM Thread Starter
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post #10 of 33 (permalink) Old 10-29-2013, 09:53 PM Thread Starter
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is that the weep hole? because it looks like the water comes out of that hole! so what I need are new seals I guess. Is this caused by having too much water on the system?
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