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Oil Pressure Sender [message #331079]

Thu, 19 April 2018 09:27

Carl S.

Messages: 4186
Registered: January 2009
Location: Tucson, AZ.

Karma: 13

Senior Member

After the engine failure, rebuild, and break in process, I think my stock oil pressure sender has some schmutz in it and is reading erratically. I need to replace it. I walked out of the house this morning without the parts interchange manual (part of the aging process, I suppose) so I need the part number for the proper sender.

I also noticed there are two different part numbers, one for 0 - 60 psi and one for 0 - 80 psi. Which one should I get (closest to stock)? I replaced this part before and the parts man had a hard time finding a sender as opposed to a switch for an idiot light.

Thanks,

Carl Stouffer '75 ex Palm Beach Tucson, AZ. Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member

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Re: Oil Pressure Sender [message #331083 is a reply to message #331079]

Thu, 19 April 2018 11:42

jhbridges

Messages: 8412
Registered: May 2011
Location: Braselton ga

Karma: -74

Senior Member

I'd use the 0 to 60 one. Mike Briere's coach was on its third sender when it left here, and that sender was failing. It's probably not junk, but a failing heathen chinee sender which is coming apart internally from engine vibration. A classic racer at The Mitty showed me the cure in an old 'vette - remote the sender on a piece of braided oil line and bolt it to the radiator frame or fender well. He said even the chinee ones last that way.

--johnny

Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons. Braselton, Ga. I forgive them all, save those who hurt the dogs. They must answer to me in hell

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Re: Oil Pressure Sender [message #331084 is a reply to message #331083]

Thu, 19 April 2018 12:25

Carl S.

Messages: 4186
Registered: January 2009
Location: Tucson, AZ.

Karma: 13

Senior Member

Thanks Johnny, I suspect the stock sender is a 0 - 60 unit, so that's what I will try to get.

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Re: Oil Pressure Sender [message #331104 is a reply to message #331084]

Thu, 19 April 2018 21:11

Bruce Hart

Messages: 1500
Registered: October 2011
Location: La Grange, Wyoming

Karma: 5

Senior Member

Johnny, that Napa number is

OP6640
OP6640SB value line

Bruce Hart 1976 Palm Beach 1977 28' Kingsley La Grange, Wyoming

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Re: Oil Pressure Sender [message #331120 is a reply to message #331079]

Fri, 20 April 2018 07:30

jhbridges

Messages: 8412
Registered: May 2011
Location: Braselton ga

Karma: -74

Senior Member

Bruce, I used whatever Advance supplied. They're all Pacific Rim any more, and the pivots inside shake apart and the fulcrum falls out. Alls you have to do is go in the store with the dead one, give some ID - phone number is best- and they hand you another one, good for another year or so.

--johnny

Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons. Braselton, Ga. I forgive them all, save those who hurt the dogs. They must answer to me in hell

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Re: Oil Pressure Sender [message #331124 is a reply to message #331079]

Fri, 20 April 2018 07:49

Ken Burton

Messages: 10030
Registered: January 2004
Location: Hebron, Indiana

Karma: 10

Senior Member

I would go with the 80 PSI sender. Here is my logic.

40 PSI which is where I would expect the gauge to run going down the highway would be 1/2 scale. 60 PSI which is where the relief valve would kick in cold would be 3/4 scale. If the relief valve in the pump were ever to stick driving the cold oil pressure higher than 60, you would see it using an 80 PSI sender. You would not see it using a 60 PSI sender.

I believe 80 PSI is OEM.

Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

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Re: [GMCnet] Oil Pressure Sender [message #331125 is a reply to message #331124]

Fri, 20 April 2018 08:11

powwerjon

Messages: 849
Registered: March 2013

Karma: -2

Senior Member

I am with Ken on using the 80 PSIG sender. I have an 0 to 80 analog gauge
in my MAC dash. On a cold startup it indicated 65 psig and settles at
about 48 psig at run temp. The stock Oil Pressure Indication in the dash
doesn't know if it is 60 or 80 Psig, as it is a 0 to 90 ohm sender. You
have to interpolate what your gauge means. The 60 psig sender is 0/15/30
at midpoint/45 and 60psig at 100 %. The 80 psig sender is 0/20/40 at
midpoint/60 and then 80 at 100%. I too like to see all my important
gauges, oil and water temp to be pointing at midpoint.

J.R. Wright
GMC Great Laker
GMC Eastern States
GMCMHI
TZE Zone Restorations
78 Buskirk Custom 30' Stretch
75 Avion (Under going Frame up Restoration)

On Fri, Apr 20, 2018 at 8:49 AM, Ken Burton wrote:

> I would go with the 80 PSI sender. Here is my logic.
>
> 40 PSI which is where I would expect the gauge to run going down the
> highway would be 1/2 scale. 60 PSI which is where the relief valve would
> kick in
> cold would be 3/4 scale. If the relief valve in the pump were ever to
> stick driving the cold oil pressure higher than 60, you would see it using
> an
> 80 PSI sender. You would not see it using a 60 PSI sender.
>
> I believe 80 PSI is OEM.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
>
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Re: [GMCnet] Oil Pressure Sender [message #331143 is a reply to message #331125]

Fri, 20 April 2018 12:46

mghamms

Messages: 466
Registered: March 2016
Location: Ware, Massachusetts

Karma: 2

Senior Member

What is the Napa part number for the 80 PSI sender?

1977 Kingsley 455 as stock as it gets except lots of Ragusa parts

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Re: [GMCnet] Oil Pressure Sender [message #331163 is a reply to message #331143]

Fri, 20 April 2018 20:28

Bruce Hart

Messages: 1500
Registered: October 2011
Location: La Grange, Wyoming

Karma: 5

Senior Member

Mike,
80# NAPA # OP6638 and OP6636

On Fri, Apr 20, 2018 at 11:46 AM, Mike Hamm wrote:

> What is the Napa part number for the 80 PSI sender?
> --
> 1977 Kingsley 455 as stock as it gets except lots of Ragusa parts
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Bruce Hart
1976 Palm Beach
Milliken, Co
GMC=Got More Class
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Bruce Hart 1976 Palm Beach 1977 28' Kingsley La Grange, Wyoming

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Re: [GMCnet] Oil Pressure Sender [message #331170 is a reply to message #331163]

Sat, 21 April 2018 00:58

Ken Burton

Messages: 10030
Registered: January 2004
Location: Hebron, Indiana

Karma: 10

Senior Member

I thought that the NAPA OP6638 was the 80 PSI sender and the OP6636 was a 60 PSI sender. Checking the NAPA web site both show 80 PSI which may be a mistake on their part. It makes no sense to me to have 2 part numbers 2 digits apart for the same item. That said I would go for the one that ends in 8. If you have to get the other one OP6636 I think I would connect it to say 40 or 60 PSI air pressure and read it's resistance before installing. Then you can prove me right or wrong.

Ken B.

Bruce Hart wrote on Fri, 20 April 2018 20:28

Mike,
80# NAPA # OP6638 and OP6636

On Fri, Apr 20, 2018 at 11:46 AM, Mike Hamm wrote:

> What is the Napa part number for the 80 PSI sender?
> --
> 1977 Kingsley 455 as stock as it gets except lots of Ragusa parts
>

--
Bruce Hart
1976 Palm Beach
Milliken, Co
GMC=Got More Class

Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

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Re: [GMCnet] Oil Pressure Sender [message #331172 is a reply to message #331170]

Sat, 21 April 2018 04:01

GMC Cruse

Messages: 606
Registered: June 2009
Location: SE Michigan

Karma: 3

Senior Member

Ken Burton wrote on Sat, 21 April 2018 01:58

I thought that the NAPA OP6638 was the 80 PSI sender and the OP6636 was a 60 PSI sender. Checking the NAPA web site both show 80 PSI which may be a mistake on their part. It makes no sense to me to have 2 part numbers 2 digits apart for the same item. That said I would go for the one that ends in 8. If you have to get the other one OP6636 I think I would connect it to say 40 or 60 PSI air pressure and read it's resistance before installing. Then you can prove me right or wrong.

Ken B.

I found this for the 80 psi:

Manufacturer's Part Listing Cross Reference
Competitor Part Number OEM
AC / DELCO / GM 10045777 OEM
AC / DELCO / GM 14040816 OEM
AC / DELCO / GM 14078954 OEM
AC / DELCO / GM 15591103 OEM
AIRTEX 1S6563 aftermarket
AMERICAN MOTORS 8953000834 OEM
BIG A 20-81 aftermarket
BORG WARNER S4012 aftermarket
BORG WARNER S768 aftermarket
ECHLIN OP6638 aftermarket
FILKO OP-109X aftermarket
GENERAL AUTOMOTIVE SPECIALTY 2473 aftermarket
GENERAL AUTOMOTIVE SPECIALTY 24730 aftermarket
GENERAL AUTOMOTIVE SPECIALTY 24731 aftermarket
GENERAL AUTOMOTIVE SPECIALTY OP24731 aftermarket
GP/SORENSEN OPS68 aftermarket
GP/SORENSEN OPS82 aftermarket
KEM PS101 aftermarket
MIGHTY 3-1816 aftermarket
NAPA OP6638 aftermarket
NIEHOFF DR135S aftermarket
NIEHOFF OP24731 aftermarket
SORENSEN PS-150 aftermarket
STANDARD / HYGRADE PS-155 aftermarket
WELLS PS133 aftermarket

Mike K. '75 PB Southeast Michigan

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Re: [GMCnet] Oil Pressure Sender [message #331173 is a reply to message #331172]

Sat, 21 April 2018 05:30

Ken Burton

Messages: 10030
Registered: January 2004
Location: Hebron, Indiana

Karma: 10

Senior Member

Thanks,

That kind of backs up what I was thinking. OP6636 is NOT listed in the interchange list that you posted. Now I really think it is listed wrong on the NAPA web site. I did not check the GMCMI parts interchange it might be correct there. I think that I would not buy the OP6636.

Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

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Re: [GMCnet] Oil Pressure Sender [message #331180 is a reply to message #331173]

Sat, 21 April 2018 09:42

Bruce Hart

Messages: 1500
Registered: October 2011
Location: La Grange, Wyoming

Karma: 5

Senior Member

Used the GMCI parts book and that is what was printed.

On Sat, Apr 21, 2018 at 4:30 AM, Ken Burton wrote:

> Thanks,
>
> That kind of backs up what I was thinking. OP6636 is NOT listed in the
> interchange list that you posted. Now I really think it is listed wrong
> on
> the NAPA web site. I did not check the GMCMI parts interchange it might
> be correct there. I think that I would not buy the OP6636.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Bruce Hart
1976 Palm Beach
Milliken, Co
GMC=Got More Class
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Bruce Hart 1976 Palm Beach 1977 28' Kingsley La Grange, Wyoming

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