Oil Pressure and Engine Rebuild
#1
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Is oil pressure indicate a sign for an engine rebuild? My 968CS is running between 1.8 - 2.0bar at idle when oil temperature at 90 - 95C and 4.0 - 4.5bar at acceleration. According to the manual, the engine should be running at 2.5bar at idle. Does it mean it is time to look at freshen it up? At the moment it has 93,000miles on the clock.
#2
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I'm pretty sure better mechanical minds than me will answer your question. but FWIW, mine is about the same and always has been - had it from 30,000 miles. I expect that the readings are fairly normal.
I've also heard of the gauge pick-up becoming faulty to though in that case it just read high all the time.
I've also heard of the gauge pick-up becoming faulty to though in that case it just read high all the time.
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under acceleration, (just short of 5) to 5 bars is probably about ideal. under normal throttle, 4 to 4 and a half bars is fine. what you have is still ok, but normal engine wear might be telling you it's time to switch to a thicker oil (something every car's engine eventually requires). i would suggest running slightly thicker 15w50 like Amsoil.... and your oil pressure will come up a little.
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Last edited by odurandina; 10-04-2012 at 09:53 AM.
#5
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At the moment I am using 15W50, when going full chat, it will be showing a little short of 5bar (may be 4.6-7bar) on the gauge and 2 bar at idle or around 1.8bar when it goes really warmed up at 30-33C ambient heat. I am worry about the pressure when idling... it seems low when compare to the workshop manual standard.
#6
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That does seem very low. I'm at about 2.5 during hot idle. First of all make sure you're topped up on oil, as pressure will drop if you're low. You can get the oil pressure up with a thicker oil, but you'll have to address the real issue sooner or later - rod bearings, oil pump, cracked pickup tube,...?
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#8
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That does seem very low. I'm at about 2.5 during hot idle. First of all make sure you're topped up on oil, as pressure will drop if you're low. You can get the oil pressure up with a thicker oil, but you'll have to address the real issue sooner or later - rod bearings, oil pump, cracked pickup tube,...?
Raj
#9
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Mine behaved exactly like yours - hot idle was noticeably below 2.0. For this reason and a host of others, I pulled the engine and completely rebuilt it. I will be very interested to see if the hot idle oil pressure comes back into the accepted normal range, or will it stay low, in which case I'll have to conclude it's a issue with the gauge.
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Mine with temp at the quarter mark-idling at 950 RPM showing 3 3/4 bar, under accelaration it goes rigth up to 5 bar -so at 1.8-2.0 bar it's kind of low.But like mention it could be a faulty gauge.Btw what density of oil are you running?(PLEASE PEOPLES DON'T START ANOTHER OIL THREAD)
Last edited by ernie9468; 02-04-2013 at 01:49 PM.
#12
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That will do it ,15w-50 or preferably 20w-50 , as it says so in the owners manual( that came with the car) oil viscosity chart in the shaded look at me section regarding multigrade oils , from minus 10 deg cel to unlimited high temp( sounds like TX to me ) = 15W - 50 or 20w-50 .
10w-40 = low oil pressure & lower oil film strength ( if both oils have the same ZDDP ) usually the 10w-40 will be lower on ZDDP
10w-40 = low oil pressure & lower oil film strength ( if both oils have the same ZDDP ) usually the 10w-40 will be lower on ZDDP
#13
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That will do it ,15w-50 or preferably 20w-50 , as it says so in the owners manual( that came with the car) oil viscosity chart in the shaded look at me section regarding multigrade oils , from minus 10 deg cel to unlimited high temp( sounds like TX to me ) = 15W - 50 or 20w-50 .
10w-40 = low oil pressure & lower oil film strength ( if both oils have the same ZDDP ) usually the 10w-40 will be lower on ZDDP
10w-40 = low oil pressure & lower oil film strength ( if both oils have the same ZDDP ) usually the 10w-40 will be lower on ZDDP
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Depending how cold it is in your part of the wood,why don't you give 20w50 a try.Btw there could be a difference in your oil pressure depending on which brand your using.(But once again don't want to start another oil thread).Personally I'm using Valvoline VR1 with ample ZDDP to protect a 968 motor without issues.
Last edited by ernie9468; 02-04-2013 at 01:49 PM.