High Oil Pressure - MVAgusta.net
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Old 03-10-2018, 04:06 PM Thread Starter
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High Oil Pressure

Started the Mv Agusta F4 for a ride and notice that oil was leaking out of the filter, new filter, so I put a new filter on and as the engine fired it blew the filter rubber gasket, what's going on, check the oil pressure, Very High, also does anyone has a diagram of the oil lines locations or ideals to what is going on . Again blowing filters as engine being started

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Old 03-10-2018, 04:51 PM
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It's explained (within reason) in the Engine Workshop Manual. What F4 have you got as you don't say

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Old 03-10-2018, 05:06 PM
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Since you are in the First Gen section, I'm going to assume you left the old filter's o-ring stuck to the engine case. It is a common problem. I seriously doubt, unless you put in 90 W gear oil, that you have a high oil pressure problem following an oil change.

The double o-ring would provide a leak path.

Or, conversely, there is no o-ring.....


(Where I say "o-ring" here, I am referring the "flat seal" Noel describes below. In my ex-Navy world, they are called Wall-Seals" because the cross-section is square or rectangular.)

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Last edited by silentservice703; 03-11-2018 at 08:30 AM.
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Old 03-10-2018, 09:43 PM Thread Starter
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Its a 2005 Mv Agusta F4, oil pressure was over 100 lbs. when filter gasket started leaking.
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Old 03-11-2018, 01:23 AM
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Thumbs down ?????

Sorry, after 58 years off and on as a professional mechanic......
You did something wrong......
What brand of filter?
Does it have an O-ring or flat seal?
I would never use a filter with an O-ring
The Purolator filters I use and recommend have a flat seal 4mm wide and 5.8mm thick,
You can't "blow it out" because 4mm of the seal are inside the filter can
Did you use MV's stupid method of torquing the filter? and use the silly clamp?
How did you determine that the oil pressure was over 100psi?
The oil pump has a pressure relief valve as in every motor

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Old 03-11-2018, 01:36 AM
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Quote:
Originally Posted by silentservice703 View Post
Since you are in the First Gen section, I'm going to assume you left the old filter's o-ring stuck to the engine case. It is a common problem. I seriously doubt, unless you put in 90 W gear oil, that you have a high oil pressure problem following an oil change.

The double o-ring would provide a leak path.

Or, conversely, there is no o-ring.....
Chuck;
He's in the 4 cylinder section......not 1st Gen
All real motors have oil pressure relief valves
Cold 60W is probably thicker than warm 90W
The oil pressure relief valve will not let the pressure go over a set value, it doesn't know the viscosity,
it's just a ball and a spring


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Old 03-11-2018, 01:40 AM
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Like Noel said if everything is OK with fitting the oil filter.The only thing that would cause high oil pressure is the oil pump relief valve stuck closed which doesn’t happen often.How did you test the oil pressure,with a master gauge?


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Old 03-11-2018, 08:34 AM
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Quote:
Originally Posted by theknurl View Post
Chuck;
He's in the 4 cylinder section......not 1st Gen
All real motors have oil pressure relief valves
Cold 60W is probably thicker than warm 90W
The oil pressure relief valve will not let the pressure go over a set value, it doesn't know the viscosity,
it's just a ball and a spring

I swear when I looked at the category for this post it had a date range of 2000-2009. You KNOW how I love guessing at which bike year and model we are remotely diagnosing.

I know and agree with everything else you are saying here...you know I do.

My bet is on the former filter's seal being stuck to the engine block and then spinning on the new filter. Yes, I've done it.

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Old 03-11-2018, 09:38 AM Thread Starter
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Oil pressure was check with a Snap On gauge, what's making the Filter blow is the high pressure, I don't think it the filter, used 15x50 Weight Oil, also check to see if there was a gasket left in, No
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Old 03-11-2018, 10:07 AM
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Interesting.

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