Low oil pressure
12-01-10, 05:11 PM
#1
Just cruising
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Low oil pressure
My S5 T2 has about 9-10 lbs/sq ft oil pressure at idle and only goes up to like 40 lbs at 3000 rpm.
My first thought was the front cover gasket. When I removed the front eccentric thermostat it was covered in oil.
I've had several T2s apart but I can't remember if it is normal for it be oil coated. If it isn't, could that cause my low oil pressure?
If it normal, what do you guys think could be causing this?
ashley
My first thought was the front cover gasket. When I removed the front eccentric thermostat it was covered in oil.
I've had several T2s apart but I can't remember if it is normal for it be oil coated. If it isn't, could that cause my low oil pressure?
If it normal, what do you guys think could be causing this?
ashley
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so we put the solid piece in there and are used to seeing high pressure on a cold motor.
12-01-10, 09:38 PM
#10
well, if the engine has a lot of miles or so it will drop the oil pressure.
The clearances inside the engine between the bearings will become bigger. To create pressure you need to restrict flow, if the bearings are wearing out a lot that just means more flow but less pressure.
Another reason can be the thermo pellet in the eccentric shaft can be stuck "open" causing oil pressure to drop because of bypass and no oil into the rotor to cool it.
The clearances inside the engine between the bearings will become bigger. To create pressure you need to restrict flow, if the bearings are wearing out a lot that just means more flow but less pressure.
Another reason can be the thermo pellet in the eccentric shaft can be stuck "open" causing oil pressure to drop because of bypass and no oil into the rotor to cool it.
12-02-10, 01:39 AM
#12
http://fc3spro.com/TECH/HOWTO/OTB/otb.html
Only con I can see is that warming up will take longer since oil will be squirted into the rotors to cool them, so longer warm up, more gas will be used during cold starts.
It basically blocks the bypass passageway. When the engine is cold, the thermopellet is contracted allowing oil to pass through, since they pass through, not enough pressure is built up inside the shaft to let oil spray inside the rotors. Once the engine warms up, the pellet expands pushing it forward to block the oil passage to the oil pan allowing pressure to build in shaft, and oil spray inside rotors to cool them.
12-02-10, 03:47 PM
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i get 60-80 now. i had the same problem and people told me that 10-20 at high rpms was fine.............wrong. to get your oil pressure back up and to get better oil pressure, you have to take off the front cover and replace the o-ring that blows out that seats up against the engine to the cover. they like to get brittle and blow out on one side. now, you can get higher oil pressure by taking off the oil pan and removing the oil pressure control valve on the underside of the engine. put it in an exhaust pipe bender with the tip of it towards the press and gently push the tip in about half way. i did this and have wonderful oil pressure. banzairacing.com shows you how to do so.
12-02-10, 04:42 PM
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i get 60-80 now. i had the same problem and people told me that 10-20 at high rpms was fine.............wrong. to get your oil pressure back up and to get better oil pressure, you have to take off the front cover and replace the o-ring that blows out that seats up against the engine to the cover. they like to get brittle and blow out on one side. now, you can get higher oil pressure by taking off the oil pan and removing the oil pressure control valve on the underside of the engine. put it in an exhaust pipe bender with the tip of it towards the press and gently push the tip in about half way. i did this and have wonderful oil pressure. banzairacing.com shows you how to do so.
ash
12-02-10, 05:56 PM
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have you ever taken the front cover off before? if you or anybody else has, you or they might have pinched that o-ring while reassembling the cover. i have done that once before and it is not hard to do. make sure you use something like trim adhesive to hold it in place while you assemble everything back together...
Last edited by blackrotary23; 12-02-10 at 05:57 PM. Reason: misprint
12-03-10, 08:54 AM
#23
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12-03-10, 09:01 AM
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have you ever taken the front cover off before? if you or anybody else has, you or they might have pinched that o-ring while reassembling the cover. i have done that once before and it is not hard to do. make sure you use something like trim adhesive to hold it in place while you assemble everything back together...
When I get around to pulling the front cover, do I need the be concerned with the needle bearing falling down?
How about when I changed the front seal, could it have fallen then? The engine was mounted on an engine stand but I don't think it was perfectly level, close, but a few degrees off.