Home » Public Forums » GMCnet » Oil Pressure - again
| Oil Pressure - again [message #176823] |
Sun, 15 July 2012 16:21  |
Neil
Messages: 271
Registered: July 2007
Location: Los Angeles and Magalia, ...
Karma: 1
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Senior Member |
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I am on my 3rd Jasper motor (but that's another story) and have developed a vexing oil pressure issue similar to that with previous motors.
First, let me say it runs great. The best ever. And it does not run hot at all. Even with a/c on while towing.
I have a Big Mac dash with an electric oil gauge and then being a not so trusting sort, mechanical gauges for everything too.
This motor has less than 15k miles on it. It is starting to do what prior motors did, which is show low oil presure.
On the last desert trip I was seeing hot idle down to 12 lbs, and hot running at 3000 rpm at about 30 - 35 lbs.
True confessions, a local mechanic down the street changed the oil just before that trip and I don't know what he used.
When I got home I changed oil and filter, used Shell Rotella 10-40, went for a drive to dump the black tank and it "seemed" better. I changed the oil again and after a few months finally took it for a drive today. It is doing odd things.
Cold start, good pressure, say 40 lbs at high idle. Once warmed up, it dropped to 15 lbs at idle with the a/c on which dropped it a bit further.
Went for a drive on an 85 degree day on the freeway up a slight grade, drove it 70-75 mph (water temp never got abot 185, oil was at 190) oil pressure at 3000 rpm indicated was 35 lbs.
When driving at 70 mph, if I lifted off the gas the oil presure would climb about 5 lbs and then drop when I pushed on the gas,
It is not over filled it is not foaming as far as I can tell.
Now here is the really weird part. After I got it up the driveway at home (long, twisty, uphill and a PIA to park) and the oil temp got up to 200, the pressure at idle was indicating 20 lbs.
My next step is to change the oil again and send a sample out for analysis. But none of this is making any sense to me. Both the mechanical and the electric gauge take their pressure readings off the same "t". Could there be some obstruction there? Any other good armchair guesses? I am afraid I will have a choice between doing 70% of the work of removing the motor to get to the oil pump vs remove the motor for a tear down when it works just perfect.
Right now I wish I just had an idiot light.
Neil
76 Eleganza now sold
Los Angeles
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| Re: [GMCnet] Oil Pressure - again [message #176829 is a reply to message #176823] |
Sun, 15 July 2012 17:07  |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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Senior Member |
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Wow- after two Jaspers you actually put in a third?
The Jasper that I had, which was installed by Buskirk, threw a rod bearing about 300 miles out of the warranty. When the shop tore it down they found that one head had been cracked and welded, both heads had the wrong valve seats and they had been cut so far into the heads that they were all leaking coolant, the bearings were the cheapest they could buy, the pistons were mismatched and two of them had higher domes which gave more compression on those cylinders.
That was the last Jasper product that I would ever put in.
Emery Stora
On Jul 15, 2012, at 3:21 PM, Neil Martin <nmartin@hfbllp.com> wrote:
>
>
> I am on my 3rd Jasper motor (but that's another story) and have developed a vexing oil pressure issue similar to that with previous motors.
>
> First, let me say it runs great. The best ever. And it does not run hot at all. Even with a/c on while towing.
>
> I have a Big Mac dash with an electric oil gauge and then being a not so trusting sort, mechanical gauges for everything too.
>
> This motor has less than 15k miles on it. It is starting to do what prior motors did, which is show low oil presure.
>
> On the last desert trip I was seeing hot idle down to 12 lbs, and hot running at 3000 rpm at about 30 - 35 lbs.
>
> True confessions, a local mechanic down the street changed the oil just before that trip and I don't know what he used.
>
> When I got home I changed oil and filter, used Shell Rotella 10-40, went for a drive to dump the black tank and it "seemed" better. I changed the oil again and after a few months finally took it for a drive today. It is doing odd things.
>
> Cold start, good pressure, say 40 lbs at high idle. Once warmed up, it dropped to 15 lbs at idle with the a/c on which dropped it a bit further.
>
> Went for a drive on an 85 degree day on the freeway up a slight grade, drove it 70-75 mph (water temp never got abot 185, oil was at 190) oil pressure at 3000 rpm indicated was 35 lbs.
>
> When driving at 70 mph, if I lifted off the gas the oil presure would climb about 5 lbs and then drop when I pushed on the gas,
>
> It is not over filled it is not foaming as far as I can tell.
>
> Now here is the really weird part. After I got it up the driveway at home (long, twisty, uphill and a PIA to park) and the oil temp got up to 200, the pressure at idle was indicating 20 lbs.
>
> My next step is to change the oil again and send a sample out for analysis. But none of this is making any sense to me. Both the mechanical and the electric gauge take their pressure readings off the same "t". Could there be some obstruction there? Any other good armchair guesses? I am afraid I will have a choice between doing 70% of the work of removing the motor to get to the oil pump vs remove the motor for a tear down when it works just perfect.
>
> Right now I wish I just had an idiot light.
> --
> Neil
> 76 Eleganza
> Los Angeles
> _______________________________________________
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| Re: Oil Pressure - again [message #176830 is a reply to message #176823] |
Sun, 15 July 2012 17:12 |
kerry pinkerton
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma: 15
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Senior Member |
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Being new here and having never had an Olds motor, I'll go out on a limb and make some comments based on experience with other brands. If I'm full of crap on the 455s be nice...  Just trying to help.
1- I've never seen an engine that did not start making noise in the valve train (mainly in the lifters) when the oil pressure was 'too' low. My wife fusses at me because I don't drive with music on so I can 'hear' what the vehicle is saying to me. They are really quite talkative if you take the time to listen.
2- If you've got insufficient oil volume your oil temp will go up. There is a weird relationship between pressure and volume. You can get high pressure oil pumps or high VOLUME oil pumps but I don't recall seeing a high pressure AND high volume pump... Oil temp is basically the internal temp of the engine. Low flow rates through the engine let it pick up too much heat and not help carry off engine heat via the oil cooler.
3- Mechanical AND electrical senders/gauges are not known for accuracy unless you spend some pretty good money for them. I'm talking NASCAR type gauges, not what you find at AutoZone.
I guess what I'm suggesting is that if your valves are quiet and your oil temp is OK, you're probably good to go. You don't NEED 60psi at idle. I've had cars that ran for years with the guage barely off the peg at idle.
Again speaking from ignorance, but some engines like the inline Chevy 250's have a big oil hole letting oil run down on the timing chain then drain back into the pan. WAAAAAY more oil on the chain than needed and because it is a large hole relatively close to the oil pump, it drains off a lot of oil pressure and volume that is needed on the top side of the motor. The solution is to restrict the oil hole by about 50%. Increases measured pressure at the top end and still has plenty of oil for the timing chain. Don't know if the 455s have a similar setup.
New engines should not be effected by this but I'm into antique cars and some of them are well used. Some will smoke and show little pressure. I simply put Valvoline 50 weight racing oil in them. It's a non detergent oil and it makes two immediate changes. No more blue smoke at startup where it is leaking past the valve seals because the 50W is thicker. Increased oil pressure again because of the thicker oil. The only downside is harder starting in cold weather but because these were not daily drivers, they were rarely started in cold weather. All the experts say this is poppycock but I've done it a dozen times. Sometimes just switching to a straight 30W non detergent stops smoking at startup and running down the road.
I know you want your RV motor to be RIGHT so I guess I'm just rambling.
Kerry Pinkerton - North Alabama
Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L
[Updated on: Sun, 15 July 2012 17:18] Report message to a moderator |
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| Re: Oil Pressure - again [message #176831 is a reply to message #176823] |
Sun, 15 July 2012 17:23 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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Hi Neil: Maybe check to see if you got a good engine ground to frame. That could make the gauges act funny. Yes do an oil analysis, then you will know..
| Neil wrote on Sun, 15 July 2012 17:21 |
I am on my 3rd Jasper motor (but that's another story) and have developed a vexing oil pressure issue similar to that with previous motors.
First, let me say it runs great. The best ever. And it does not run hot at all. Even with a/c on while towing.
I have a Big Mac dash with an electric oil gauge and then being a not so trusting sort, mechanical gauges for everything too.
This motor has less than 15k miles on it. It is starting to do what prior motors did, which is show low oil presure.
On the last desert trip I was seeing hot idle down to 12 lbs, and hot running at 3000 rpm at about 30 - 35 lbs.
True confessions, a local mechanic down the street changed the oil just before that trip and I don't know what he used.
When I got home I changed oil and filter, used Shell Rotella 10-40, went for a drive to dump the black tank and it "seemed" better. I changed the oil again and after a few months finally took it for a drive today. It is doing odd things.
Cold start, good pressure, say 40 lbs at high idle. Once warmed up, it dropped to 15 lbs at idle with the a/c on which dropped it a bit further.
Went for a drive on an 85 degree day on the freeway up a slight grade, drove it 70-75 mph (water temp never got abot 185, oil was at 190) oil pressure at 3000 rpm indicated was 35 lbs.
When driving at 70 mph, if I lifted off the gas the oil presure would climb about 5 lbs and then drop when I pushed on the gas,
It is not over filled it is not foaming as far as I can tell.
Now here is the really weird part. After I got it up the driveway at home (long, twisty, uphill and a PIA to park) and the oil temp got up to 200, the pressure at idle was indicating 20 lbs.
My next step is to change the oil again and send a sample out for analysis. But none of this is making any sense to me. Both the mechanical and the electric gauge take their pressure readings off the same "t". Could there be some obstruction there? Any other good armchair guesses? I am afraid I will have a choice between doing 70% of the work of removing the motor to get to the oil pump vs remove the motor for a tear down when it works just perfect.
Right now I wish I just had an idiot light.
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C. Boyd
76 Crestmont
East Tennessee
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| Re: [GMCnet] Oil Pressure - again [message #176838 is a reply to message #176829] |
Sun, 15 July 2012 18:39 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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do you have the AL intake manifold?
gene
On Sun, Jul 15, 2012 at 3:07 PM, Emery Stora <emerystora@mac.com> wrote:
> Wow- after two Jaspers you actually put in a third?
>
> The Jasper that I had, which was installed by Buskirk, threw a rod bearing
> about 300 miles out of the warranty. When the shop tore it down they found
> that one head had been cracked and welded, both heads had the wrong valve
> seats and they had been cut so far into the heads that they were all
> leaking coolant, the bearings were the cheapest they could buy, the pistons
> were mismatched and two of them had higher domes which gave more
> compression on those cylinders.
>
> That was the last Jasper product that I would ever put in.
>
>
>
> Emery Stora
>
> On Jul 15, 2012, at 3:21 PM, Neil Martin <nmartin@hfbllp.com> wrote:
>
> >
> >
> > I am on my 3rd Jasper motor (but that's another story) and have
> developed a vexing oil pressure issue similar to that with previous motors.
> >
> > First, let me say it runs great. The best ever. And it does not run hot
> at all. Even with a/c on while towing.
> >
> > I have a Big Mac dash with an electric oil gauge and then being a not so
> trusting sort, mechanical gauges for everything too.
> >
> > This motor has less than 15k miles on it. It is starting to do what
> prior motors did, which is show low oil presure.
> >
> > On the last desert trip I was seeing hot idle down to 12 lbs, and hot
> running at 3000 rpm at about 30 - 35 lbs.
> >
> > True confessions, a local mechanic down the street changed the oil just
> before that trip and I don't know what he used.
> >
> > When I got home I changed oil and filter, used Shell Rotella 10-40, went
> for a drive to dump the black tank and it "seemed" better. I changed the
> oil again and after a few months finally took it for a drive today. It is
> doing odd things.
> >
> > Cold start, good pressure, say 40 lbs at high idle. Once warmed up, it
> dropped to 15 lbs at idle with the a/c on which dropped it a bit further.
> >
> > Went for a drive on an 85 degree day on the freeway up a slight grade,
> drove it 70-75 mph (water temp never got abot 185, oil was at 190) oil
> pressure at 3000 rpm indicated was 35 lbs.
> >
> > When driving at 70 mph, if I lifted off the gas the oil presure would
> climb about 5 lbs and then drop when I pushed on the gas,
> >
> > It is not over filled it is not foaming as far as I can tell.
> >
> > Now here is the really weird part. After I got it up the driveway at
> home (long, twisty, uphill and a PIA to park) and the oil temp got up to
> 200, the pressure at idle was indicating 20 lbs.
> >
> > My next step is to change the oil again and send a sample out for
> analysis. But none of this is making any sense to me. Both the mechanical
> and the electric gauge take their pressure readings off the same "t".
> Could there be some obstruction there? Any other good armchair guesses?
> I am afraid I will have a choice between doing 70% of the work of removing
> the motor to get to the oil pump vs remove the motor for a tear down when
> it works just perfect.
> >
> > Right now I wish I just had an idiot light.
> > --
> > Neil
> > 76 Eleganza
> > Los Angeles
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: [GMCnet] Oil Pressure - again [message #176840 is a reply to message #176838] |
Sun, 15 July 2012 19:06 |
Neil
Messages: 271
Registered: July 2007
Location: Los Angeles and Magalia, ...
Karma: 1
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Senior Member |
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I have the Al manifold with no leaks. I have an AL radiator.
What has me really scratching my head is how the pressure went up right at the end of today's experiment when the oil was hottest, and both the electric and mechanical gauges agree.
I just sent for a Blackstone oil analysis kit, but I really don't have enough miles on the oil for them to see anything.
There has to be a dumb and simple answer.
Neil
76 Eleganza now sold
Los Angeles
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| Re: Oil Pressure - again [message #176844 is a reply to message #176823] |
Sun, 15 July 2012 19:25 |
bwevers
Messages: 597
Registered: October 2010
Location: San Jose
Karma: 5
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Senior Member |
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"When driving at 70 mph, if I lifted off the gas the oil presure would climb about 5 lbs and then drop when I pushed on the gas..."
Could it be that the radiator water is heating up(and cooling)
the oil? The GMC has the oil cooler inside the radiator. I
noticed that my 455 with 123,000 miles loses some oil pressure
when I put a load on the engine and the water temp rises.
My coach also gains oil pressure when I lift off the gas and coast.
I think an external oil outside the radiator would work better.
Regards,
Bill
Bill Wevers GMC49ers, GMC Western States
1975 Glenbrook - Manny Powerdrive, OneTon
455 F Block, G heads
San Jose
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| Re: [GMCnet] Oil Pressure - again [message #176845 is a reply to message #176829] |
Sun, 15 July 2012 19:27 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Emery,
Now tell us what you REALLY think of Jasper's products, don't hold back! ;-)
Regards,
Rob M.
-----Original Message-----
From: Emery Stora
Wow- after two Jaspers you actually put in a third?
The Jasper that I had, which was installed by Buskirk, threw a rod bearing about 300 miles out of the warranty. When the shop tore
it down they found that one head had been cracked and welded, both heads had the wrong valve seats and they had been cut so far into
the heads that they were all leaking coolant, the bearings were the cheapest they could buy, the pistons were mismatched and two of
them had higher domes which gave more compression on those cylinders.
That was the last Jasper product that I would ever put in.
Emery Stora
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Oil Pressure - again [message #176846 is a reply to message #176845] |
Sun, 15 July 2012 19:31 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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I guess I left out a lot of 4 letter words!
Emery Stora
On Jul 15, 2012, at 6:27 PM, Rob Mueller <robmueller@iinet.net.au> wrote:
> Emery,
>
> Now tell us what you REALLY think of Jasper's products, don't hold back! ;-)
>
> Regards,
> Rob M.
>
> -----Original Message-----
> From: Emery Stora
>
> Wow- after two Jaspers you actually put in a third?
>
> The Jasper that I had, which was installed by Buskirk, threw a rod bearing about 300 miles out of the warranty. When the shop tore
> it down they found that one head had been cracked and welded, both heads had the wrong valve seats and they had been cut so far into
> the heads that they were all leaking coolant, the bearings were the cheapest they could buy, the pistons were mismatched and two of
> them had higher domes which gave more compression on those cylinders.
>
> That was the last Jasper product that I would ever put in.
>
> Emery Stora
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] Oil Pressure - again [message #176849 is a reply to message #176847] |
Sun, 15 July 2012 20:07 |
Neil
Messages: 271
Registered: July 2007
Location: Los Angeles and Magalia, ...
Karma: 1
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Senior Member |
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Emery
I was seeing two different things
1 - the oil pressure fluctuating 5 to 7 lbs, maybe 10 lbs with what looked like vacuum (gas on -- gas off).
2 - when I got home and just before shutting down my idle oil pressure, which had been as low as 12 lbs with the oil temp at 190, was reading 20 lbs with the oil temp at 200. a very noticeable improvement and frankly, if I had 20 lbs at hot idle all the time I would be happy.
I just can't figure out a unified theory which explains the several different observations.
Neil
76 Eleganza now sold
Los Angeles
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| Re: Oil Pressure - again [message #176866 is a reply to message #176823] |
Sun, 15 July 2012 22:16 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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Senior Member |
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You may be worrying too much about a couple of pounds low that may be just a result of high ambient temperatures. Like Kerry says if it isn't getting noisy it's probably ok but I can understand your concern. Did you check those failed engines and find the crap inside that emery experienced?
Roy Keen
Minden,NV
76 X Glenbrook
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| Re: Oil Pressure - again [message #176873 is a reply to message #176823] |
Sun, 15 July 2012 22:44 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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I'd check all the connections on the senders, grounds and gauges first. Could it also be your bypass spring is installed wrong or the wrong one??? Is the bypass at the toggle point and relieving pressure at odd times? Not thinking it's the filter spring as you have changed the oil several times. Is it a PF24? OBTW On mine with stock gauges, I just remembered that it was going (bouncing) HI at idle and then dropping down to a normal reading above idle. I suspect a bad connection or a wacky sender??? I'll have to now have a look since you reminded me. As far as the other reply on nondetergent oil and racing oil, both are very bad choices for motorhome duty. Just my 'oil wars' opinion.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Oil Pressure - again [message #176890 is a reply to message #176823] |
Mon, 16 July 2012 07:46 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Neil,
I note below:
"with an electric oil gauge and then being a not so trusting sort, mechanical gauges for everything too."
"Both the mechanical and the electric gauge take their pressure readings off the same "t"."
Questions:
1) Does the oil pressure track (read) the same on both gages at the same time?
2) What brand of electric gauge?
3) What brand of mechanical gauge?
Regards,
Rob M.
-----Original Message-----
From: Neil Martin
I am on my 3rd Jasper motor (but that's another story) and have developed a vexing oil pressure issue similar to that with previous
motors.
First, let me say it runs great. The best ever. And it does not run hot at all. Even with a/c on while towing.
I have a Big Mac dash with an electric oil gauge and then being a not so trusting sort, mechanical gauges for everything too.
This motor has less than 15k miles on it. It is starting to do what prior motors did, which is show low oil presure.
On the last desert trip I was seeing hot idle down to 12 lbs, and hot running at 3000 rpm at about 30 - 35 lbs.
True confessions, a local mechanic down the street changed the oil just before that trip and I don't know what he used.
When I got home I changed oil and filter, used Shell Rotella 10-40, went for a drive to dump the black tank and it "seemed" better.
I changed the oil again and after a few months finally took it for a drive today. It is doing odd things.
Cold start, good pressure, say 40 lbs at high idle. Once warmed up, it dropped to 15 lbs at idle with the a/c on which dropped it a
bit further.
Went for a drive on an 85 degree day on the freeway up a slight grade, drove it 70-75 mph (water temp never got abot 185, oil was at
190) oil pressure at 3000 rpm indicated was 35 lbs.
When driving at 70 mph, if I lifted off the gas the oil presure would climb about 5 lbs and then drop when I pushed on the gas,
It is not over filled it is not foaming as far as I can tell.
Now here is the really weird part. After I got it up the driveway at home (long, twisty, uphill and a PIA to park) and the oil temp
got up to 200, the pressure at idle was indicating 20 lbs.
My next step is to change the oil again and send a sample out for analysis. But none of this is making any sense to me. Both the
mechanical and the electric gauge take their pressure readings off the same "t". Could there be some obstruction there? Any other
good armchair guesses? I am afraid I will have a choice between doing 70% of the work of removing the motor to get to the oil pump
vs remove the motor for a tear down when it works just perfect.
Right now I wish I just had an idiot light.
--
Neil
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Oil Pressure - again [message #176899 is a reply to message #176890] |
Mon, 16 July 2012 09:36 |
Neil
Messages: 271
Registered: July 2007
Location: Los Angeles and Magalia, ...
Karma: 1
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Senior Member |
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[quote title=Robert Mueller wrote on Mon, 16 July 2012 07:46]Questions:
1) Does the oil pressure track (read) the same on both gages at the same time?
2) What brand of electric gauge?
3) What brand of mechanical gauge?
Rob
The electric is what came with the Mac dash. I think an ISSPRO.
The mechanical is an Auto Meter
The two gauges agree with the caveat that the mechanical gauge is slower reacting and reads a bit higher. But that could be just because it has more degrees of sweep and thus there are more increments which are easier to see.
Neil
76 Eleganza now sold
Los Angeles
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| Re: [GMCnet] Oil Pressure - again [message #176900 is a reply to message #176899] |
Mon, 16 July 2012 09:47 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Neil,
OK, I reckon we've eliminated an indication problem as they both track together and Auto Meter is a good brand.
Now if either one of your gauges were a cheap Harbor Freight piece of crap like mine it might be a different story! ;-)
BTW the HF gauge tracks the Digi-Panel reading!
Regards,
Rob M.
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Neil Martin
Sent: Monday, July 16, 2012 9:36 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Oil Pressure - again
[quote title=Robert Mueller wrote on Mon, 16 July 2012 07:46]Questions:
1) Does the oil pressure track (read) the same on both gages at the same time?
2) What brand of electric gauge?
3) What brand of mechanical gauge?
Rob
The electric is what came with the Mac dash. I think an ISSPRO.
The mechanical is an Auto Meter
The two gauges agree with the caveat that the mechanical gauge is slower reacting and reads a bit higher. But that could be just
because it has more degrees of sweep and thus there are more increments which are easier to see.
Neil
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Oil Pressure - again [message #176913 is a reply to message #176904] |
Mon, 16 July 2012 12:36 |
shawnee
Messages: 422
Registered: February 2004
Location: NC
Karma: 0
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Senior Member |
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| WD0AFQ wrote on Mon, 16 July 2012 11:15 |
Neil, did yall clean the oil cooler really good? It might have had a little something in it that has let go now and is getting into your oil pressure "hole". After the second engine let go I was afraid to use the internal cooler of the aluminum radiator. We installed a fairly large external cooler that Jim sent me. Before I had two coolers but now just one. Does not seem to be a big deal. A big deal is the two tranny coolers. The external one makes a big difference.
But, with both gauges fluxuating nearly the same, makes me feel the problem is a real one. Do you hear any valvetrain noise at all when the pressure drops?
Dan
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Dan,
Any time you have an engine or transmission failure it is mandatory you clean out the radiator cooler and external cooler well before using it. A once through clean will not do it. It must be a thorough cleaning or you have a good chance of ruining the replacement. This applies to both styles of radiators.
Gene Dotson
74 Canyonlands
www.bdub.net/Motorhome_Enhancements New Windows and Aluminum Radiators
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