Coolant level increasing on its own!? - MVAgusta.net
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post #1 of 14 (permalink) Old 11-29-2007, 11:35 AM Thread Starter
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Coolant level increasing on its own!?

Ok, I'm not sure if i'm going blind but I topped the coolant tank up to the max line the other day on my F4R 750 and decided to check it today to see how it was and it was about 1cm above the max line! I'm not sure if this is something to get worried about or should I just bleed the excess and be done with it. Just to note I have been experiencing temperatures of up to 100 - 105C in traffic but mainly 80-90 sometimes less at the moment in winter. Any guidance would be very much appreciated.

James
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post #2 of 14 (permalink) Old 11-29-2007, 12:07 PM
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Was the bike level both times it was checked? Or was it on the sidestand?
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post #3 of 14 (permalink) Old 11-29-2007, 12:11 PM Thread Starter
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Yes, I forgot to mention it was on it's rear paddock stand both before and after.

Last edited by jamesclarke; 11-29-2007 at 12:13 PM. Reason: not enough info
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post #4 of 14 (permalink) Old 11-29-2007, 12:17 PM
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Coolant level will vary up and down slightly under normal operation. If the engine was extremely cool when you topped up the resevoir, and was slightly warm when you checked again then the level would likely be somewhat higher.

If I'm not mistaken, overfilling the resvoir on the F4 is common cause of overflowing. Seems I have read more then once to maintain coolant level nearer the minimum mark on cool engines.

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post #5 of 14 (permalink) Old 11-29-2007, 12:39 PM Thread Starter
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Quote:
Originally Posted by esq'z me
Coolant level will vary up and down slightly under normal operation. If the engine was extremely cool when you topped up the resevoir, and was slightly warm when you checked again then the level would likely be somewhat higher.

If I'm not mistaken, overfilling the resvoir on the F4 is common cause of overflowing. Seems I have read more then once to maintain coolant level nearer the minimum mark on cool engines.
That would make some sense as it was cold when i topped it up and piping hot after riding when i checked it.
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post #6 of 14 (permalink) Old 11-29-2007, 03:10 PM
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Quote:
Originally Posted by jamesclarke
Ok, I'm not sure if i'm going blind but I topped the coolant tank up to the max line the other day on my F4R 750 and decided to check it today to see how it was and it was about 1cm above the max line! I'm not sure if this is something to get worried about or should I just bleed the excess and be done with it. Just to note I have been experiencing temperatures of up to 100 - 105C in traffic but mainly 80-90 sometimes less at the moment in winter. Any guidance would be very much appreciated.

James
James,
I would err on the side of caution when topping up the resevoir. Overfilling can cause the engine to dump coolant at the end of a ride.
Heard this happen on plenty of 1000s but not sure about the 750.
Advice generally is keep it between max and min.
There are a load of threads on this site about this, so I would check them out.
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post #7 of 14 (permalink) Old 11-29-2007, 06:12 PM
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Air in the system
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post #8 of 14 (permalink) Old 11-29-2007, 09:39 PM
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I have that problem quite a lot. It really pisses off my wife.....

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post #9 of 14 (permalink) Old 11-29-2007, 10:06 PM
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I have that problem quite a lot. It really pisses off my wife.....

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post #10 of 14 (permalink) Old 11-30-2007, 07:25 AM
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That would make some sense as it was cold when i topped it up and piping hot after riding when i checked it.
There's your answer. The plastic coolant tank is an expansion tank. The level should go down as it cools.

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