oil pressure behavior
06-24-2009, 07:14 PM
#16
Drifting
Thread Starter
First check the sender and if it checks out you should check the OPRV.
http://www.clarks-garage.com/phpBB2/...ghlight=washer
http://www.clarks-garage.com/phpBB2/...ghlight=washer
if i understand the operation of the oprv, it would only open when oil pressure is high enough to push the spring backwards. so maybe my spring is weak? I see in that thread about the guy shimming the oprv spring. is that trick applicable on all styles of oprv's?
also, do i need a oprv alignment tool if i'm only removing the oprv and not removing the oil cooler housing?
06-24-2009, 07:29 PM
#17
Not Special
Rennlist Member
Rennlist Member
Two great Oil temp gauge threads in the Turbo forum:
https://rennlist.com/forums/944-turb...mp-gauges.html
https://rennlist.com/forums/944-turb...emp-gauge.html
Some guys will use the drain plug for temp, some guys will get a sandwich plate at the oil filter for the temp sender. As for OPRV, a lot depends on what OPRV you have. My understanding of how the tool works is that it's really only useful if you have the cooler off, but there are wiser minds than me out here.
https://rennlist.com/forums/944-turb...mp-gauges.html
https://rennlist.com/forums/944-turb...emp-gauge.html
Some guys will use the drain plug for temp, some guys will get a sandwich plate at the oil filter for the temp sender. As for OPRV, a lot depends on what OPRV you have. My understanding of how the tool works is that it's really only useful if you have the cooler off, but there are wiser minds than me out here.
06-24-2009, 07:32 PM
#18
Not Special
Rennlist Member
Rennlist Member
Here's an ancillary question about a temp sender. I don't have a turbo, but I have a plug where the turbo oil drain goes on my S2. Could a sensor be put in that plug?
06-24-2009, 08:15 PM
#21
Addict
Rennlist Member
Rennlist Member
From Clark's Garage.....
The 944's oil pressure should run 4-5 bar at idle when the engine is cold. It will gradually decrease to 2-3 bar at idle as the engine oil warms to normal operating temperature. Once the oil is at normal operating temperature, the oil pressure should indicate around 4 bar at 5,000 rpm. It takes the oil longer to reach its normal operating temperature than the coolant. Therefore, don't be surprised if oil pressure continues to decline after the coolant temperature has stabilized at its normal operating temperature. Occasionally, you may see your oil pressure drop to less than 2 bar. This may happen on very hot days when the car has been driven particularly hard. You should be extremely concerned if the oil pressure dropped to less than 1 bar. This is indicative of an problem with the oil pressure indication or the oiling system itself. Under these circumstances, the car should not be driven until the cause of the low oil pressure indication is determined and corrected.
There are several things that may indicate a problem with the oil pressure indication. If your oil pressure is pegged high (5 bar) or won't indicate less than 4 bar at normal operating temperature, there is likely a problem with the oil pressure sending unit.
There are several things that may indicate a problem with the oil pressure indication. If your oil pressure is pegged high (5 bar) or won't indicate less than 4 bar at normal operating temperature, there is likely a problem with the oil pressure sending unit.
06-25-2009, 01:46 AM
#22
Drifting
Thread Starter
the car idles just a hair over 2 bar hot. it's just that it doesn't go more than a hair past 3 even when i rev.....
so far after the pickup tube and rod bearing replace, i have never hit under 1 bar
so far after the pickup tube and rod bearing replace, i have never hit under 1 bar
06-25-2009, 10:26 AM
#23
Three Wheelin'
I'm going to guess that either a gauge issue, or an OPRV binding issue. Before digging into the OPRV, I'd be inclined to get a secondary gauge to confirm your real oil pressure.
06-25-2009, 10:49 AM
#25
Three Wheelin'
Or you could just go right for the OPRV. But I hat playing with this things, so I'd double check pressures if at all possible (again, if it were me - you may really like pulling OPRVs and aligning the cooler housing).
06-25-2009, 03:03 PM
#27
Three Wheelin'
You only need the tool to align the oil cooler housing. So as long as you don't loosen or take that off, you're file to pull and inspect the OPRV. But you might just find out that you need the tool because that's your real issue. Or maybe the spring is beat, or maybe a seal is bad....
06-25-2009, 09:42 PM
#28
Drifting
Thread Starter
draining oil. took the oprv out. the o ring looks good to me. unless the outer diameter of of the o ring itself is wrong or something.
i thought there was supposed to be a crush washer here?
just for my understanding, which style of oprv is this? i read about the "shimming" of the spring. how do i do that?
i thought there was supposed to be a crush washer here?
just for my understanding, which style of oprv is this? i read about the "shimming" of the spring. how do i do that?