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10-30-2006, 12:12 PM
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#1
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2 Rivet Member
1988 34.5' Airstream 345
White Lake
, Michigan
Join Date: Mar 2006
Posts: 95
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High oil pressure indicated on gauges
I have noticed that with the addition of a new and larger oil cooler to my 454 engine that my oil pressure seems to be running much higher...almost at the top...baring any problem with my gauge...what is the potential harm of high oil pressure? My oil level seems to be the same on my dip stick... but does the new oil cooler effect the proper level of oil level? It would seem that the level in my pan is still the proper method for measuring oil but I don't want to
do anything that will jeapardize my oil pump or engine life...Mr. D..
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10-30-2006, 12:42 PM
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#2
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Rivet Master
Join Date: Dec 2002
Posts: 1,335
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Well, Mr D, I know nothing about your particular engine, but in my book, cooler oil = thicker oil = higher oil pressure = good thing, so I would be very happy in your situation. But then what do I know...............
Nick.
__________________
Nick Crowhurst, Excella 25 1988, Dodge Ram 2500 Cummins Diesel. England in summer, USA in winter.
"The price of freedom is eternal maintenance."
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10-30-2006, 07:46 PM
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#3
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3 Rivet Member
1982 34' Limited
Tidewater
, Virginia
Join Date: Dec 2002
Posts: 186
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Is your cold oil pressure with the new cooler higher than your cold pressure without the new cooler? If so there is probably a problem, unless you also changed your oil to a heavier viscosity (10w-30 to 20w-50 for example) at the same time. Cold, pre- and post- cooler, oil pressures should be the same (or VERY close).
Take care,
__________________
Old trucks and old trailers . . . a comfortable combination!
AIR 1446
W5CDR
A-6E All Weather Attack Driver, BUFF
USN Aircraft Maintenance Officer, Ret.
'91 Suburban R-2500 w/BBC
'78 Honda GL-1000
'72 Triumph T-100R Daytona
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10-30-2006, 08:20 PM
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#4
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Rivet Master
2003 22' International CCD
Kiln
, Mississippi
Join Date: Dec 2005
Posts: 2,779
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Resistance
Your oil cooler and connecting hoses may have changed the dynamics in your oil system. What I mean is, where the oil pressure sensing sensor is located may be experiencing a little more back pressure - say if the lines were smaller diameter or the oil cooler was creating a back pressure that is being sensed by the sensor. This may not be a bad thing - the original sensor location and oil handling system was designed form the factory to sense the oil pressure with a designed oil flow from the pump to the rest of the engine, that has now changed with the addition of the oil cooler. BAD, GOOD, NO CHANGE???? all depends on the final oil distribution to the engine. If enough pressure is developed to push the oil through the cooler and to the rest of the engine then you are fine. There may be a test location on the engine to get post cooler pressure readings and give you your answer. Pull a valve cover, and run the engine - oil squirt all over the place??? then you have enough pressure.
__________________
Michael & Tina with Layla and Preston BZ The family has grown. 2003 22' INTERNATIONAL CCD
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10-31-2006, 07:06 AM
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#5
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2 Rivet Member
1988 34.5' Airstream 345
White Lake
, Michigan
Join Date: Mar 2006
Posts: 95
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Do you think that other symtoms would occur if the oil distribution was not 100% ...such as over heating...performance issues..etc? Pulling a valve cover on my rig is no small item...if I could get by with some other indicators I would like to find that alternative...but at this point peace of mind would be worth pulling a valve cover...Mr. D.
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10-31-2006, 07:20 AM
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#6
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Moderator
2004 30' Classic Slideout
Fenton
, Missouri
Join Date: Mar 2002
Posts: 10,411
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Always the potential that the pressure sensor is faulty. Had this happen on a tow vehicle once. It just might be coincidental that it got sick about the time you made the cooler change.
Jack
__________________
Jack Canavera
STL Mo.
AIR #56 S/OS#15
'04 Classic 30' S.O.,'03 GMC Savana 2500
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10-31-2006, 07:27 AM
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#7
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Rivet Master
1984 28' Funeral Coach
Belleview
, Florida
Join Date: Jun 2005
Posts: 1,635
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A new sensor won't set you back much money and installation is a breeze. Save the box and you'll have a spare if the reading is the same.
Also if you want to check the top end just pull the breather tube out and use a flash light to take a look at the top of the head under the cover. A dental mirror or some other type of devise inserted into the breather hole parallel to the top of the valve cover will give you a good indication of how much oil is squirting out without getting any on you.
Let us know what you find.
__________________
Glen Coombe AIR #8416
1984 28' Funeral Coach
Former Rolling Showroom & PuttLab (now party bus)
"I'm not an expert. But I did sleep in an Airstream last night."
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10-31-2006, 10:44 AM
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#8
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Retired.
Currently Looking...
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, At Large
Join Date: Jun 2003
Posts: 21,276
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Quote:
Originally Posted by Mr. D
Do you think that other symtoms would occur if the oil distribution was not 100% ...such as over heating...performance issues..etc? Pulling a valve cover on my rig is no small item...if I could get by with some other indicators I would like to find that alternative...but at this point peace of mind would be worth pulling a valve cover...Mr. D.
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You can hook up a mechanical gauge where the sensor is now, and run the engine throughout it operating temps. A mechanical gauge with all its lines and adapters is only about $20. After you are done testing, you can put it back in its box until next time you need it.
__________________
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
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10-31-2006, 11:50 AM
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#9
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Rivet Master
1951 21' Flying Cloud
1960 24' Tradewind
West Coast
, BC
Join Date: Feb 2005
Posts: 3,790
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In a 70 Chevelle with a 454 bored 60 thou over I had very high oil pressure. I had used a high volume oil pump but it was above what that would give me. I had problems keeping rear seals in it until I finally got nasty and epoxied the pan one on to the pan first - not the best way to do it but at the time I needed to fix the leak. That cured that problem but I was still concerned about the very high oil pressure. It didn't take too long for me to find that the external oil cooler I'd put on to keep the oil temps down had a small blockage in it. I took it to a rad shop and they flushed it out and my pressure dropped to normal. It was a new GM oil cooler so don't know what was in it, probably something from the manufacturing process, and darned good thing whatever it was didn't get loose and into the oil system and take out my bearings. Let us know what you resolve with yours.
Barry
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10-31-2006, 12:25 PM
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#10
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3 Rivet Member
1982 34' Limited
Tidewater
, Virginia
Join Date: Dec 2002
Posts: 186
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Just a simple follow-up to my original post. At start-up, cold, is the pressure any different (higher/lower) than before the cooler install? Also, is this an additional cooler or a larger one in place of the original?
Take care,
__________________
Old trucks and old trailers . . . a comfortable combination!
AIR 1446
W5CDR
A-6E All Weather Attack Driver, BUFF
USN Aircraft Maintenance Officer, Ret.
'91 Suburban R-2500 w/BBC
'78 Honda GL-1000
'72 Triumph T-100R Daytona
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11-01-2006, 10:18 AM
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#11
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3 Rivet Member
1982 28' Airstream 280
Norfolk
, Virginia
Join Date: Mar 2006
Posts: 135
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I would vote for Terry and use a mechanical gauge. With an electrical one, you have to match the sender with the gauge, not so the mechanical one. I had the same problem reading too high a pressure until I discovered that I had the wrong sender.
Steve
Barry is probably on to something. Crud in the lines is a more common occurence than you think.
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11-02-2006, 11:28 AM
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#12
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2 Rivet Member
1988 34.5' Airstream 345
White Lake
, Michigan
Join Date: Mar 2006
Posts: 95
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I'm not sure what was original...but when I bought the rig...it had an external cooler about half the size of the new one...I can't remember what the cold start pressure was before the new cooler was installed but on a scale of 0 to 80 on my gauge...I'm idling at about 70 and running at 75...Recently I had to disconnect the oil cooler and lost some oil in the process...my pressure dropped to around 60....My dip stick is still between add and full...which make me think the extra oil the new larger cooler holds may be part of my oil pressure issues...thanks for all the advice...the weather is turning cold but this should be an item I can work on from the inside...I will try to use your ideas...thanks to all...Mr. D.
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