Oil Pressure Sender

Carl Stouffer

Carl Stouffer

Well-known member
Jan 15, 2009
4,693
381
83
Tucson, Arizona 85718
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
 
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 Chinese 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 chinese ones last that
way.

--johnny
--
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" - ol Andy, paraphrased
 
Last edited by a moderator:
Thanks Johnny, I suspect the stock sender is a 0 - 60 unit, so that's what I will try to get.
--
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
 
Johnny, that Napa number is

OP6640
OP6640SB value line

--
Bruce Hart
1976 Palm Beach
Milliken, Co
 
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
--
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" - ol Andy, paraphrased
 
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
 
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)

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

> Mike,
> 80# NAPA # OP6638 and OP6636
>

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

> 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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