| Oil Pressure [message #116616] |
Sat, 26 February 2011 08:57  |
2-4 the road
Messages: 145
Registered: June 2009
Location: Fulltimers
Karma: 0
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Senior Member |
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Are we out of luck? We've got a 455 that we
have put 10K miles on. It runs very well and
and isn't noisy at all. It has only 27 psi
warm going down the road. 50 psi starting
and 18 idling. We've driven it all over and
it hasn't changed since we bought it. We run
Mobil 1 15w50 full syn. in it. Should we be
worried? After reading some of the other
posts I'm concerned.
about it?
2-4 the road
77 Kingsley 455
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| Re: Oil Pressure [message #116619 is a reply to message #116616] |
Sat, 26 February 2011 09:26  |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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| 2-4 the road wrote on Sat, 26 February 2011 09:57 |
Are we out of luck? We've got a 455 that we
have put 10K miles on. It runs very well and
and isn't noisy at all. It has only 27 psi
warm going down the road. 50 psi starting
and 18 idling. We've driven it all over and
it hasn't changed since we bought it. We run
Mobil 1 15w50 full syn. in it. Should we be
worried? After reading some of the other
posts I'm concerned.
about it?
|
Sir: you might want to install a good manual oil pressure gauge and compare readings.
C. Boyd
76 Crestmont
East Tennessee
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| Re: Oil Pressure [message #116628 is a reply to message #116616] |
Sat, 26 February 2011 10:21 |
kingd
Messages: 592
Registered: June 2004
Karma: 2
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Senior Member |
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I'll give a real example of why a GOOD mechanical guage should be used before "assuming" anything about oil pressure. I have a 1976 SOB, yes it is 26' long and has an American iron big block(not quite a 455) The stock electric guage has always since I've had the MH read about 1/4 up the non numbered scale. Being the "know it all" I sometimes tend to be, I decided to slightly shim the oil pressure relief spring. The pump is external on my engine. I added small washers about equal to the thickness of a penny (in total) under the spring. The weather was reasonable. I started the engine and the guage read slightly higher so I revved it up a bit. (probably 2500 RPM)
At this point my son who was in front of the MH starts to frantically wave his arms, so I shut off the engine. Oil all over the place and the base plate of the filter was bowed out.
(yeah, it was an orange filter)
So I took out the shims and got a real guage. 80 PSI at cold slow idle, 40 PSI at hot idle and 60 PSI going down the road. Now I NEVER look at the stock oil pressure guage.
DAVE KING
DAVE KING
lurker, wannabe
Toronto, Ontario, Canada
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| Re: Oil Pressure [message #116666 is a reply to message #116619] |
Sat, 26 February 2011 16:51 |
raybakerjr
Messages: 2
Registered: December 2008
Location: Beaumont TX
Karma: 0
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Junior Member |
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Where's the best place to connect the guage to engine?
Ray
'98 S-10 SS
'85 Z-28
'75 Eleganza
various 2 wheelers
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| Re: [GMCnet] Oil Pressure [message #116671 is a reply to message #116669] |
Sat, 26 February 2011 17:28 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Rob
I got you the measurements.
We stock the digipanel also along with the replacement wire sensor connnectors.
On Sat, Feb 26, 2011 at 3:09 PM, Rob Mueller <robmueller@iinet.net.au> wrote:
> JoAnne,
>
> I have three oil pressure indicators in Double Trouble:
>
> 1) OEM gage
> 2) Cheap Harbor Freight electric gage
> 3) Digi Panel
>
> The OEM has no marking so you really don't know what the pressure is.
>
> The cheap HF gage reads 50 +/- 10psi going down the highway depending on the
> temperature of the Shell Rotella T 15-40W.
>
> The Digi Panel follows the HF gage + / - 5 psi.
>
> I had manual gage in parallel with the OEM gage when I was having electrical
> problems with the OEM gages and found that it followed the Digi Panel + / -
> 5 psi.
>
> I reckon the Digi Panel with the automatic warning tones is one of the best
> investments anyone can make for their GMC. It will tell you the instant any
> one of the monitored readings goes out of spec.
>
> http://www.digi-panel.com/
>
> Regards,
> Rob M.
> USAussie - Downunder
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
>
>
> -----Original Message-----
> From: gmclist-bounces@temp.gmcnet.org
> [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of JoAnne Bissell
> Sent: Sunday, February 27, 2011 2:45 AM
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] Oil Pressure
>
>
>
> Thanks everybody. We feel better about it.
> _______________________________________________
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Oil Pressure [message #116686 is a reply to message #116666] |
Sat, 26 February 2011 18:43 |
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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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Ray,
Put a Tee in where the OEM sender goes.
http://www.gmcmhphotos.com/photos/showphoto.php?photo=32525
Yes, this is Dan's engine and yes, I brought the following to his attention.
If you need to extend the nipple that screws into the engine block DO NOT
USE ONE MADE OF BRASS get one made of steel! Someone reported that they had
a brass on crack and/or break.
The nipple has 1/8" pipe threads.
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Ray Baker. Jr.
Sent: Sunday, February 27, 2011 9:51 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Oil Pressure
Where's the best place to connect the guage to engine?
Ray
--
'98 S-10 SS
'85 Z-28
'74 Eleganza
various 2 wheelers
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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 [message #116751 is a reply to message #116686] |
Sun, 27 February 2011 09:09 |
raybakerjr
Messages: 2
Registered: December 2008
Location: Beaumont TX
Karma: 0
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Junior Member |
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Thanks Rob. My OE guage is all over the place and my digi is 60 cold and when warm never moves from 25.
Ray
'98 S-10 SS
'85 Z-28
'75 Eleganza
various 2 wheelers
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| Re: [GMCnet] Oil Pressure [message #116757 is a reply to message #116686] |
Sun, 27 February 2011 10:23 |
idrob
Messages: 645
Registered: January 2005
Location: Central Idaho
Karma: 0
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Senior Member |
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| Robert Mueller wrote on Sat, 26 February 2011 16:43 |
If you need to extend the nipple that screws into the engine block DO NOT
USE ONE MADE OF BRASS get one made of steel! Someone reported that they had a brass on crack and/or break.
The nipple has 1/8" pipe threads.
|
Also, do not use the nylon oil pressure line which is commonly supplied. On a SOB with a 454 chev, there was a nylon line to the oil pressure gauge a PO had installed. One day I broke a fan belt, and the flying belt pieces took out the nylon line, resulting in a high pressure oil leak. I could drive without the alternator belt, but the oil line almost lost me the engine as there were no pullouts and no shoulder at all.
Even with a copper line, I would cover it with some plastic tubing to guard against chaffing and do careful routing, with lots of tie downs.
Rob Allen
former owner of '76 x-PB
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| Re: [GMCnet] Oil Pressure [message #116776 is a reply to message #116757] |
Sun, 27 February 2011 14:09 |
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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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Rob,
Good point!
I am sitting at my desk in Sydney and can't look at The Blue Streak to
provide the exact routing but I protected the nylon line of the oil pressure
gage installed in Double Trouble by tie wrapping it to the left radiator
shroud support and to the top of the upper radiator hose.
Whether or not it would work if you broke a fan belt I can't say but at
least the line wasn't hanging out in the middle of nowhere.
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Rob Allen
Sent: Monday, February 28, 2011 3:23 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Oil Pressure
Also, do not use the nylon oil pressure line which is commonly supplied. On
a SOB with a 454 chev, there was a nylon line to the oil pressure gauge a PO
had installed. One day I broke a fan belt, and the flying belt pieces took
out the nylon line, resulting in a high pressure oil leak. I could drive
without the alternator belt, but the oil line almost lost me the engine as
there were no pullouts and no shoulder at all.
Even with a copper line, I would cover it with some plastic tubing to guard
against chaffing and do careful routing, with lots of tie downs.
--
Rob Allen
former owner of '76 x-PB
_______________________________________________
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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