High Oil Pressure - Page 3 - MVAgusta.net
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post #21 of 43 (permalink) Old 03-13-2018, 06:31 AM
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Is the thread on the filter dodgy ? Maybe it has cross threaded..?

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post #22 of 43 (permalink) Old 03-13-2018, 07:55 AM
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Quote:
Originally Posted by theknurl View Post
page G06 of the parts manual is where the item is shown

It screws into the output gallery of the pressure pump.....if there was detritus in it, the pressure would be low, not high
Not the best of designs, small holes tend to aerate the oil when spraying it back into the pan....not a good thing
Better to feed it back into the suction side of the pressure pump, eliminating the problem and cutting horsepower losses

@theknurl: Noel, can you find a pressure spec for any of the MV bikes? The part is shown, but not clearly named or identified as to its location. I know it lives in the oil circuit at the pump pressure outlet, but only in one manual (B4 Engine) is it referenced.

While searching for this part and how it is identified I ran across a part number for an Engine Overhaul Manual - Digital on CD. Is that a much more detailed reference?

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post #23 of 43 (permalink) Old 03-20-2018, 08:58 PM
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I don't know what the specs are but here are from figures from my old 750 :

Cold, idle, 80psi
Cold, 4000-5000 rpm 100psi.

Left it run for a while until fans had kicked in and out and in again.

Hot, idle, 60 psi.
Hot, 4000+ rpm 95 psi
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post #24 of 43 (permalink) Old 03-21-2018, 05:59 AM
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@knee down: Did you resolve this? If so, how?

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post #25 of 43 (permalink) Old 03-21-2018, 06:42 AM
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The proper way to measure oil pressure is by attaching a gauge to the main oil galley in the crankcase, typically where the oil pressure sensor screws in on a plain bearing engine. Roller bearing engines usually have a measuring point in the cylinder head. At least that's the way it is in Japanese engines.

Most motorcycle plain bearing engines run a similar oil pressure spec. Roller bearing engines rely on volume more than pressure and have much lower pressure specs.

Here is a typical spec for a Suzuki GSX-R engine:

Oil pressure
At 60 C (140 F), 3000 r/min
[Standard]:100 400 kPa (1.0 4.0 kgf/cm2, 14.5
58.0 psi)

And the BMW S1000RR basic spec: Oil circuit operating pressure 3.5 5.5 bar

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post #26 of 43 (permalink) Old 03-27-2018, 08:04 PM Thread Starter
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With the high oil pressure, oil relief valve, is there anything or way to fix this relief valve stuck without removing the oil pan? Any ideals will try before removing the pan

thanks
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post #27 of 43 (permalink) Old 03-28-2018, 12:37 AM
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Oil pan off,by the look of the parts catalogue exploded view.


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post #28 of 43 (permalink) Old 03-28-2018, 07:23 AM
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Quote:
Originally Posted by knee down View Post
With the high oil pressure, oil relief valve, is there anything or way to fix this relief valve stuck without removing the oil pan? Any ideals will try before removing the pan

thanks
Wouldn't pressure be low if this valve were stuck open?

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post #29 of 43 (permalink) Old 03-28-2018, 09:27 AM
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Quote:
Originally Posted by silentservice703 View Post
Wouldn't pressure be low if this valve were stuck open?
Yes...very low.

And high if stuck closed....... But this is a very simple ball and spring device. I have never personally seen one fail, although I have seen mechanics replace them out of caution.

Another note...when oil pressure exceeds the capacity of the oil filter media to pass the increased volume the oil filter by-pass valve opens allowing unfiltered oil into the engine passages.

States "over 100 PSI", but not at what rpm? I don't think the oil filter seal can "blow out" regardless of the pressure.

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post #30 of 43 (permalink) Old 03-28-2018, 06:17 PM Thread Starter
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Sorry for the misunderstanding about the oil pressure, oil pressure was taken as starting the engine and at those time the oil filter gasket would blow and oil pressure reading got high, engine was not started when all of this was happening, just turning over
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