PS pump mounting studs won’t fit both a Napa or autozone reman pump (SOLVED)

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77Chief77
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PS pump mounting studs won’t fit both a Napa or autozone reman pump (SOLVED)

Post by 77Chief77 »

The original power steering pump mounting bolts are slightly bigger in diameter.

At first I thought autozone gave me the wrong reman pump because the original mounting studs wouldn’t fit so I returned that pump and got a Napa reman pump and same thing.

I’m starting to think that my ps pump is out of another vehicle other than a Cherokee Chief. I mean, how can two major car part stores be wrong?

My original pump has a 181A1R marking on the reservoir. I tried googling that and no dice. I guess my options are to find studs that fit the reman (btw, one of the studs is offset for the tensioning belt bracket) or figure out what pump I’ve been running and get a reman of that.

If I sperate the reservoir from the pump will there be a part number on the pump to identify what year and model its from?
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Last edited by 77Chief77 on Fri Apr 09, 2021 3:54 am, edited 2 times in total.
1977 Chief, Wide Track, 360, TH400, QT

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77Chief77
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Re: PS pump mounting studs won’t fit both a Napa or autozone reman pump

Post by 77Chief77 »

this pump off a 91 grand wagonner almost looks like mine with the bottom offset stud
Image
1977 Chief, Wide Track, 360, TH400, QT
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Stuka
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Re: PS pump mounting studs won’t fit both a Napa or autozone reman pump

Post by Stuka »

Do you know if your engine is original, or maybe it is a newer one that was swapped in?
2017 JKU Rubicon
Pevious Jeeps: 1981 J10, 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ

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77Chief77
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Re: PS pump mounting studs won’t fit both a Napa or autozone reman pump

Post by 77Chief77 »

The PO said rebuilt engine but was not confident on a lot of things. Maybe he meant swapped engine.
1977 Chief, Wide Track, 360, TH400, QT

will e
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Re: PS pump mounting studs won’t fit both a Napa or autozone reman pump

Post by will e »

At some point they switched to metric. Check if they are 15mm and 17mm studs.
81 Waggy 'WILL E' Retired
82 Cherokee WT - SOA/SF/high steer/Alcan springs/agr box/Borgeson steering shaft/AMC 401/performer/holley TA/HEI/BeCool/727/ALTAS (2.0/2.72/5.44)/D60 Snofighter(Yukon Zip,hubs,stubs,4.56)/14 Bolt (FF,BF shave, Discs, ARB,Artec Truss)/MTR 37X12.5/Corbeau XRS Baja & 5 point retractable harness/Hella Aux lights/tuffy console/killer32 sliders/Evil Twin bumpers, rack and roll cage/WARN 8000/TT Fabworks steering brace/dual batts/custom TC skid plate/ARB fridge
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tgreese
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Re: PS pump mounting studs won’t fit both a Napa or autozone reman pump

Post by tgreese »

I'm guessing the old pump has M10-1.5 threads? It may be hard to tell from the wrench size. Take the nuts that came off to the hardware store and use their thread gauge, or match them up with the bolts there. A newer engine with metric hardware seems distinctly possible.

Newer style would be better ... durability improves as these parts get newer.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 Chryco Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.

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77Chief77
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Re: PS pump mounting studs won’t fit both a Napa or autozone reman pump

Post by 77Chief77 »

will e wrote: Sun Jan 10, 2021 7:00 am At some point they switched to metric. Check if they are 15mm and 17mm studs.
Both 18mm studs on the old pump
1977 Chief, Wide Track, 360, TH400, QT

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77Chief77
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Re: PS pump mounting studs won’t fit both a Napa or autozone reman pump

Post by 77Chief77 »

Found some new markings on the old pump.

I’ll find out what the threads are on the studs at homedepot.

Does anyone know if I can ID this pump if I separate the reservoir and look up the markings on the pump itself? Can I figure out what year and model off that?
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Last edited by 77Chief77 on Sun Jan 10, 2021 3:39 pm, edited 1 time in total.
1977 Chief, Wide Track, 360, TH400, QT
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tgreese
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Re: PS pump mounting studs won’t fit both a Napa or autozone reman pump

Post by tgreese »

77Chief77 wrote: Sun Jan 10, 2021 2:47 pm
will e wrote: Sun Jan 10, 2021 7:00 am At some point they switched to metric. Check if they are 15mm and 17mm studs.
Both 18mm studs on the old pump
When you say "18 mm" that's the wrench size. Not sure how standardized metric wrench sizes are to specific thread sizes - I suspect ... not terribly standardized. I would look at the thread size. Does not really matter, except to separate the newer metric components from the older SAE (inch) type. Anything metric implies later metric parts.

If the base of the stud fits a metric wrench, it could be metric. Realize that metric and SAE can be pretty close, ie 19 mm is 3/4". 17 is really close to 5/8".
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS/PDB, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
Dual Everything: '15 Chryco Jeep Cherokee KL Trailhawk, ECO Green
Blockchain the vote.

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77Chief77
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Re: PS pump mounting studs won’t fit both a Napa or autozone reman pump

Post by 77Chief77 »

On the old pump,18mm socket fits best on both studs. 11/16” socket fits best on the reman pump studs. So yes it’s looking like metric parts on the old mystery pump.
1977 Chief, Wide Track, 360, TH400, QT

sansabarJ
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Re: PS pump mounting studs won’t fit both a Napa or autozone reman pump

Post by sansabarJ »

The studs on metric pump are m10x1.25 . non metric are SAE are 3/8" thread. 18mm wrench size will fit precise on the nut /stud of the metric fastener . 11/16" would be just slightly too small to fit the fastener . Metric fasteners using an 18mm wrench are precise , most often the 11/16 will not fit at all . Be careful to not round off the thin nut these SAGINAW GM pumps use or you wont get the stud or bolt off .
On SAE pumps it's a 5/8 wrench or socket that fits the fastener . The pressure hose O ring fitting are interchangable with the flair fitting can be swapped and use a 1 inch wrench normally .

SansabarJ

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Re: PS pump mounting studs won’t fit both a Napa or autozone reman pump

Post by sansabarJ »

The 5/8" flat is used on most SAE thread pumps with inverted flair fitting . Nuts a 9 /16 " wrench size , as on my 72 360 SAE pump which uses both in aaddition to most all early GM SAGINAW power steering pumps .


SansabarJ

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77Chief77
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Re: PS pump mounting studs won’t fit both a Napa or autozone reman pump

Post by 77Chief77 »

sansabarJ wrote: Sun Jan 10, 2021 4:57 pm The studs on metric pump are m10x1.25 . non metric are SAE are 3/8" thread. 18mm wrench size will fit precise on the nut /stud of the metric fastener . 11/16" would be just slightly too small to fit the fastener . Metric fasteners using an 18mm wrench are precise , most often the 11/16 will not fit at all . Be careful to not round off the thin nut these SAGINAW GM pumps use or you wont get the stud or bolt off .
On SAE pumps it's a 5/8 wrench or socket that fits the fastener . The pressure hose O ring fitting are interchangable with the flair fitting can be swapped and use a 1 inch wrench normally .

SansabarJ
I’m squared away on removing the old pumps hardware, my problem is figuring out what year and model the pump is from so I can get a replacement. Mine is too beat up to try and rebuild.
1977 Chief, Wide Track, 360, TH400, QT

sansabarJ
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Re: PS pump mounting studs won’t fit both a Napa or autozone reman pump

Post by sansabarJ »

These pumps are not year specific necessarily, but yes there are differences due to threads and bracketry. Trying to cross the number won't help much . I'd look for members to show some photos of pumps they might have and get the year of THAT particular pump .In my past partsman days at auto parts store the books all have or had pictures of every pump front and back . This is what you need to see . Oreillys forexamp,e has photois of every part they sell on computer .
So dyou go in and or NAPA and tell them you got the wrong pump . The parts guy will say , oh that's what it says , then you say well let's try a couple years newer or older and look at the pics.
He or she can then look up whatever year and see if it's a different photo . Most of those pics are not generic . So , ask her for pics if guys will do it of these pumps . Sounds like you have a metric pump without the lower offset on rear lower right on pump case like the photo . So go earlier on the year . I'd your pump metric or SAE , is your bracket studs the same on pump ?
Level and one is not inset from other? SAE pumps are 70s and earlier inverted flair . Metrics use o ring pressure port . And yes you may get correct pump in box with wrong port , you can change this fitting .


SansabarJ

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Re: PS pump mounting studs won’t fit both a Napa or autozone reman pump

Post by sansabarJ »

Apologies on grammar. I forgot to proof my post .

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77Chief77
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Re: PS pump mounting studs won’t fit both a Napa or autozone reman pump

Post by 77Chief77 »

No worries and thanks for the tips!
1977 Chief, Wide Track, 360, TH400, QT

sansabarJ
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Re: PS pump mounting studs won’t fit both a Napa or autozone reman pump

Post by sansabarJ »

I worked on my 72 J4000 today with a oddball fuel pump gasket leak of oil at bottom edge of gasket . Weeping out . Anyhow my 72 SAE inverted flair pump also has the inset lower pump stud
Offset just like the photo in above posters inquirey . So there's no difference there in the pump style , besides the metric holes and o ring pressure port that I see comparing my stock 71 72 360
Setup . My Jeep is late 71 for 72 model year .


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Re: PS pump mounting studs won’t fit both a Napa or autozone reman pump

Post by 77Chief77 »

I found a PS pump from an 83 that fit the studs and mounting bracket perfectly. I had to use an o ring to flare adapter on the high pressure port but all is working great. I may convert the high pressure hose to an AN line for grins in the future. Thanks everyone!
1977 Chief, Wide Track, 360, TH400, QT
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