Home » Public Forums » GMCnet » Oil pressure indicator (What do the lines meanMy oil gage has three lines)
| Oil pressure indicator [message #276321] |
Mon, 20 April 2015 17:33  |
Jim Rountree
Messages: 47
Registered: July 2010
Location: San Antonio, TX
Karma: 0
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my oil pressure gage has three lines. what pressure do they represent?
Jim Rountree
San Antonio,TX
76 PB,
76 Royale RB
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| Re: [GMCnet] Oil pressure indicator [message #276328 is a reply to message #276321] |
Mon, 20 April 2015 19:15  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Jim,
I presume your "three lines" are the bottom, middle, and top scale marks.
If so, one can only assume that the bottom one should = 0 psi the top one
the maximum for which the sender is rated, and the middle one 1/2 of the
top one. Big assumption!
The real dilemma is that "maximum". There are at least two common senders
available from NAPA, OP6637 for a maximum of 60 psi and OP6636 for a
maximum of 80 psi. (per the chart at http://www.bdub.net/gmcmhparts/#ENGINE
).
The only way I'd ascribe any value to any meter mark is to calibrate it
myself using a known standard measuring the same source as the subject
meter. Otherwise, I'd say the middle mark means I've got "Some" and the
top one means I've got "More".
Ken H.
On Mon, Apr 20, 2015 at 6:33 PM, Jim Rountree
wrote:
> my oil pressure gage has three lines. what pressure do they represent?
> --
> Jim Rountree
> San Antonio,TX
> 76 PB,
> 77 Royale + 42in,
> 76 Royale RB.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Oil pressure indicator [message #276329 is a reply to message #276328] |
Mon, 20 April 2015 19:26 |
Kingsley Coach
Messages: 2691
Registered: March 2009
Location: Nova Scotia Canada
Karma: -34
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Senior Member |
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A pretty good read, Ken, until I got to the last paragraph where you
promptly lost me in technical jargonism...
You do get the point across though!
Mike in NS
On Mon, Apr 20, 2015 at 9:15 PM, Ken Henderson
wrote:
> Jim,
>
> I presume your "three lines" are the bottom, middle, and top scale marks.
> If so, one can only assume that the bottom one should = 0 psi the top one
> the maximum for which the sender is rated, and the middle one 1/2 of the
> top one. Big assumption!
>
> The real dilemma is that "maximum". There are at least two common senders
> available from NAPA, OP6637 for a maximum of 60 psi and OP6636 for a
> maximum of 80 psi. (per the chart at
> http://www.bdub.net/gmcmhparts/#ENGINE
> ).
>
> The only way I'd ascribe any value to any meter mark is to calibrate it
> myself using a known standard measuring the same source as the subject
> meter. Otherwise, I'd say the middle mark means I've got "Some" and the
> top one means I've got "More".
>
>
> Ken H.
>
>
> On Mon, Apr 20, 2015 at 6:33 PM, Jim Rountree
> wrote:
>
>> my oil pressure gage has three lines. what pressure do they represent?
>> --
>> Jim Rountree
>> San Antonio,TX
>> 76 PB,
>> 77 Royale + 42in,
>> 76 Royale RB.
>> _______________________________________________
>> 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
>
--
Michael Beaton
1977 Kingsley 26-11
1977 Eleganza II 26-3
Antigonish, NS
Life is too short to hold a grudge; slash some tires and call it even !
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| Re: [GMCnet] Oil pressure indicator [message #276330 is a reply to message #276328] |
Mon, 20 April 2015 19:43 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Ken,
Using your logic the bottom line (ha ha) would mean "barely enough?"
Regards,
Rob M.
-----Original Message-----
From: Ken Henderson
Jim,
I presume your "three lines" are the bottom, middle, and top scale marks.
If so, one can only assume that the bottom one should = 0 psi the top one
the maximum for which the sender is rated, and the middle one 1/2 of the
top one. Big assumption!
The real dilemma is that "maximum". There are at least two common senders
available from NAPA, OP6637 for a maximum of 60 psi and OP6636 for a
maximum of 80 psi. (per the chart at http://www.bdub.net/gmcmhparts/#ENGINE
).
The only way I'd ascribe any value to any meter mark is to calibrate it
myself using a known standard measuring the same source as the subject
meter. Otherwise, I'd say the middle mark means I've got "Some" and the
top one means I've got "More".
Ken H.
On Mon, Apr 20, 2015 at 6:33 PM, Jim Rountree
wrote:
> my oil pressure gage has three lines. what pressure do they represent?
> --
> Jim
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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 indicator [message #276331 is a reply to message #276329] |
Mon, 20 April 2015 19:57 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Mike,
All the last paragraph says is connect the OP sender and a good meter to a
common air line and crank the pressure up slowly, marking the OEM gauge to
match what the meter says at several pressures.
That better, Teach?
Ken H.
On Mon, Apr 20, 2015 at 8:26 PM, Kingsley Coach
wrote:
> A pretty good read, Ken, until I got to the last paragraph where you
> promptly lost me in technical jargonism...
> You do get the point across though!
>
> Mike in NS
>
> On Mon, Apr 20, 2015 at 9:15 PM, Ken Henderson
> wrote:
>
>> Jim,
>>
>> I presume your "three lines" are the bottom, middle, and top scale marks.
>> If so, one can only assume that the bottom one should = 0 psi the top one
>> the maximum for which the sender is rated, and the middle one 1/2 of the
>> top one. Big assumption!
>>
>> The real dilemma is that "maximum". There are at least two common
> senders
>> available from NAPA, OP6637 for a maximum of 60 psi and OP6636 for a
>> maximum of 80 psi. (per the chart at
>> http://www.bdub.net/gmcmhparts/#ENGINE
>> ).
>>
>> The only way I'd ascribe any value to any meter mark is to calibrate it
>> myself using a known standard measuring the same source as the subject
>> meter. Otherwise, I'd say the middle mark means I've got "Some" and the
>> top one means I've got "More".
>>
>>
>> Ken H.
>>
>>
>> On Mon, Apr 20, 2015 at 6:33 PM, Jim Rountree
>> wrote:
>>
>>> my oil pressure gage has three lines. what pressure do they represent?
>>> --
>>> Jim Rountree
>>> San Antonio,TX
>>> 76 PB,
>>> 77 Royale + 42in,
>>> 76 Royale RB.
>>> _______________________________________________
>>> 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
>>
>
>
>
> --
> Michael Beaton
> 1977 Kingsley 26-11
> 1977 Eleganza II 26-3
> Antigonish, NS
>
> Life is too short to hold a grudge; slash some tires and call it even !
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
GMCnet mailing list
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: Oil pressure indicator [message #276341 is a reply to message #276336] |
Mon, 20 April 2015 21:50 |
Jim Rountree
Messages: 47
Registered: July 2010
Location: San Antonio, TX
Karma: 0
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marks appear to represent 1/4 1/2 & 3/4. This is a completely stock Royale with 40,000 miles so I assume the gage & sender are original. Put in Rob's 15-40 Rotella and it went to the 3/4 mark on startup and about 1/2 when warmed up. Hope that is OK
Jim Rountree
San Antonio,TX
76 PB,
76 Royale RB
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| Re: Oil pressure indicator [message #276345 is a reply to message #276321] |
Mon, 20 April 2015 22:27 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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I just went through this with Dick Paterson a few weeks back on my coach I replaced the sender with a new OEM type one. 80 PSI is the top most line and of course the 0 PSI is the bottom most line. The middle mark is 40 PSI. Dick explained the the check / bypass valve in the oil pump is set to open at 60 PSI so on a cold engine you should never seen over 3/4 scale. That is exactly where mine reads cold.
As a side note, A poor or open electrical connection between the gage and the sender or a poor ground at the gage or sender will cause the gage to read high (not low).
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Oil pressure indicator [message #276385 is a reply to message #276341] |
Tue, 21 April 2015 12:50 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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Jim Rountree wrote on Mon, 20 April 2015 20:50marks appear to represent 1/4 1/2 & 3/4. This is a completely stock Royale with 40,000 miles so I assume the gage & sender are original. Put in Rob's 15-40 Rotella and it went to the 3/4 mark on startup and about 1/2 when warmed up. Hope that is OK
That's fine.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: Oil pressure indicator [message #276388 is a reply to message #276345] |
Tue, 21 April 2015 13:06 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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Ken Burton wrote on Mon, 20 April 2015 21:27I just went through this with Dick Paterson a few weeks back on my coach I replaced the sender with a new OEM type one. 80 PSI is the top most line and of course the 0 PSI is the bottom most line. The middle mark is 40 PSI. Dick explained the the check / bypass valve in the oil pump is set to open at 60 PSI so on a cold engine you should never seen over 3/4 scale. That is exactly where mine reads cold.
As a side note, A poor or open electrical connection between the gage and the sender or a poor ground at the gage or sender will cause the gage to read high (not low).
The only way I put importance on any of my gages is if something suddenly changes.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Oil pressure indicator [message #276411 is a reply to message #276388] |
Tue, 21 April 2015 17:08 |
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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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Aha! The voice of reason!
Regards,
Rob M.
-----Original Message-----
From: Bob de Kruyff
The only way I put importance on any of my gages is if something suddenly changes.
--
Bob
_______________________________________________
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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