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| Oil high pressure http://ducatipaso.org/forum/viewtopic.php?f=1&t=955 |
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| Author: | Gwenadu [ Thu Mar 16, 2006 3:35 pm ] |
| Post subject: | Oil high pressure |
The oil pressure of my engine is about 7 bars-cold- and 6 bars-warm- at 5000 rpm. 4 bars at idle. There is a leak between front head and cylinder. An other from the oil filter... Does somebody know this problem? Thanks! Alain. |
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| Author: | delagem [ Thu Mar 16, 2006 5:51 pm ] |
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Did you have the heads off recently? I had this same problem with a 900ss; turns out I had put the steel base gasket in wrong, and obstructed the oil return passage. Michael |
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| Author: | jcslocum [ Thu Mar 16, 2006 6:43 pm ] |
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Wow! 98 PSI is very high. Clogged oil filter might give you this condition. Are you using a ducati filter? Have you cleaned the screen in the side of the engine? Plugged up oil cooler or collapsed/pinched hose. You pressure guage might be way off? |
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| Author: | Gwenadu [ Thu Mar 16, 2006 11:17 pm ] |
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Jon, I have plugged one of the oil coolers. it had been broken and bad welded.I though that could be the cause of the "desease". I have controlled the pressure at the top of the coolers: 7.5 bars! but there is something else. The oil Filter is a Purolator. Only 500 kms use... Why do you speak about the level screen? I have removed the oil discharge valve: the spring have the normal length: 46.5mm. the cylindric part of the valve is a little worn (the ends of the spring not well grinded set over(?) the valve). I think that could be more cause of low pressure. I use 15w50. I have controlled my pressure guage: Ok! [/quote] |
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| Author: | jcslocum [ Fri Mar 17, 2006 1:59 am ] |
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The simplest thing to do is remove the oil filter and replace it. Purolator oil filters are junk (my personal opinion) and it could have collapsed. It's a just a loop so anything blocking it could cause the high pressure. I would suspect the most recent change/repair. |
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| Author: | Gwenadu [ Sun Mar 19, 2006 10:59 pm ] |
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Jon, I hoped you were right (clogged filter). I have change the oil,the strainer was clean, changed the filter. Nothing better. I have used a new manometer: same measure  . At idle the pressure seems to have"beatings", perhaps the oil valve jams :confused: ... the oil circuit seems so simple!... If somebody have a new idea???
Thanks Alain. |
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| Author: | Gwenadu [ Mon Mar 20, 2006 7:23 am ] |
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Delagem, if your idea is the good one my mechanic, who opened the engine last year, will be  ...!
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| Author: | delagem [ Mon Mar 20, 2006 1:12 pm ] |
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Gwenadu, I have to say once I read your post that you plugged one of the coolers, I think that is your problem. The base gasket backwards mistake is usually accompanied by oil oozing out around the base gasket, and you didn't mention that problem. Can you borrow a cooler setup from someone to test? I've actually got a spare, but I'm not in your neighborhood! Try disconnecting both hoses on your oil cooler system, and blowing into one hose. See if it is restricted from coming out the other hose. If so, then you probably need to replace the cooler you plugged. Another possibility: on the superbikes, there is a little plate that is installed up under the shaft that the oil filter screws onto, when you install an oil cooler to a bike that came stock without one (like my 748). This plate diverts oil to the cooler. If something were to plug it up, perhaps this would cause your problem. Not sure if the Paso uses this system as well. I will look at my spare motor today and see if the Superbike and Paso oil system are similar. I've pretty much got my Paso back together, and we just got a foot of snow! No test rides today! |
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| Author: | delagem [ Tue Mar 21, 2006 3:09 am ] |
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I checked the paso and yes, same as the superbikes, there is a little plate held in by the threaded rod/nut combo that the oil cooler threads onto. This blocks the path of oil and forces it to go to the cooler. But I really don't see how that could cause your problem. You could pull the oil filter and lower cooler hose, and then blow air into the fitting, and see if it passes freely into the hole into the filter housing. I still believe that by plugging one cooler you are putting too severe of a restriction in your oil system. On my spare cooler setup, air passes freely in one hose and out the other. Have you tried this? Beg or borrow a cooler and see if that makes a difference! |
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| Author: | Gwenadu [ Tue Mar 21, 2006 7:48 am ] |
| Post subject: | |
I have compared the pressure at the top and the bottom of the cooler and there is less than 0.5 bar of difference. It is far of the 3 bar too much... I shall test a less worn oil valve and perhaps put a washer under the head of the brass screw holding the system. About the oil sensor: Renault tractors have MWM engines. The engines are also used on boats... Perhaps in US? |
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| Author: | delagem [ Tue Mar 21, 2006 12:42 pm ] |
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Thanks for your help on my sensor! I have 3 sensors coming in, 2 from Borg Warner and one from Bosch. I will update that link when I have tested which ones work w/the Ducati. Who is MWM? Haven't heard of them. |
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| Author: | Gwenadu [ Tue Mar 21, 2006 2:09 pm ] |
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"Manheim Motoren Werke": German diesel engines . |
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| Author: | delagem [ Tue Apr 04, 2006 1:38 pm ] |
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Alain, did you ever find out what was making your Paso's oil pressure so high? Michael |
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| Author: | Gwenadu [ Tue Apr 04, 2006 9:34 pm ] |
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Hi Michael, the oil pressure is still the same . Last evening, I have made a sloop with a hose :screwy: in place of the 2nd oil cooler... still high pressure... Today I have called an other Ducati mec... For him there is something plugged -logical-: a jet between cylinder and head or in in the left tail of the crankshaft, the little hole which give oil to the spragclutch. I shall remove the tank, open the hatches to check if the oil-flow seems equivalent in the two heads. Perhaps I can blow air in return holes - the mec have heard something about oil pressure in a front head pushing oil until the rpm clock!
If things seem normal there I will unscrew the plug in the left-hand side of the crank-shaft. I have not very much time for this these days... Beautyfull weather  and work outside :thumbup: .
I will give news later! |
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| Author: | delagem [ Sat Jun 10, 2006 4:25 am ] |
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EUREKA! I've got it, I think.... I was bored last night and started reading all the articles in the various motorcycle magazines in the Downloads section of this website. And in one of those articles, there was a comment about how one of the oil coolers is always open, and the other one comes on as temps rise. Huh! First I've ever heard of this. And no, the parts microfiche doesn't show a temperature bypass. So anyways, Alain, if you have plugged the one that's always open, you will have no oil flow through the coolers at all, as the oil never flows, and therefore doesn't get warm enough to open the other cooler. My first thought to test this would be to switch the coolers from side to side. Unfortunately, they have different part #'s and therefore may not be able to be swapped, though you could try. So I stand by my original theory, that your plugged cooler is the cause of your problem. Only now for a different reason! Good luck! |
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