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replacement oil pump failures


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I'm in the process of getting ready to rebuild my 218 engine. It seems I read somewhere about failures on replacement pumps, did a search, can't find it. My oil pressure was always around 40#.  With engine apart, all bearings and journals look great. Do I reuse mine, rebuild it, replace it, asking for a friend????!!!!!

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I'm out of town and can't check, but I think the tolerances are in the repair manual.  In any case, if you were getting 40 lbs before you'll probably be fine reusing it.  If you start losing pressure, it's easy to access and replace later if need be.

 

_

 

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Been a few stories of new ones seizing up. I think I'd go new but check it carefully. I wonder if you could rig something to spin it a bit with a cordless drill ?

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13 minutes ago, Young Ed said:

Been a few stories of new ones seizing up. I think I'd go new but check it carefully. I wonder if you could rig something to spin it a bit with a cordless drill ?

It seems like it had to do with the shaft binding. Some were taking them apart prior to install and cleaning the shaft, but I can't find the reference. I may just use mine.

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I'd use your old one...it will not fail.

New chinese will.

I would not even take it apart unless sludgy.

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10 hours ago, Dodgeb4ya said:

I'd use your old one...it will not fail.

New chinese will.

I would not even take it apart unless sludgy.

No sludge, drove the car 3500 miles last summer.

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Definitely if the pump cover shows signs of leaking replace the oil pump cover gasket....a square profile rubber O- ring.

Don't let the outer rotor pump gear fall out. The smaller inner rotor gear cannot fall out.

The outer rotor gear needs to stay assembled exactly as is...meaning you could put the rotor gear in face up two ways.

Those two gears have a good wear in pattern ...you do not want to change it....otherwise possibly causing slightly lower oil pressure.

 

 

 

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Actually, I googled "dodge flathead oil pump rebuild kit" and found some good results on this site...the site search engine has trouble with words less than 4 letters, but google can make up the difference. 

 

True story:  I had been at one engineering job for not quite 3 months when I was tasked to design a specialized piece of equipment...I did a google search, sent out some emails, within an hour had a quote for the very piece of equipment that was needed for $5k, something that had been on the market for decades...the next day, I was tasked with cleaning the production area while in my office clothes, including making multiple trips to the dumpsters on a blazing August afternoon; the next week, I was formally threatened with termination for pointing out that some military hardware that was about to ship technically was not functional (they shipped it anyway and BOY HOWDY did we land in some hot water!); the next month, I was moved out of the engineering office into a storage room on the far side of the building "to improve efficiency"...about that time, while researching for another project, I found a project expense summary that laid out how management had spent $10k over 5 years trying to internally develop that piece of equipment that this dumb hick had found for half that cost, in about an hour--OOPS made some mighty important ppl get all butthurt vindictive after inadvertently exposing their glaring incompetence...so my google skillz can be simultaneously helpful and maddeningly problematic :rolleyes:

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Now Milton is a guy I understand. I actually started with the company I am with 15 years ago with my desk in "Storage Area B" lol Business was booming and engineering was the bottle neck, so people were hired and shoved everywhere they could. 

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Aw man I wish that was the case but there was all kinds of shenanigans that I was subjected to:  my new desk was from ikea that my keyboard and monitor barely fit; mgmt wanted me to go paperless but would not spring for a laptop or tablets, they just figured I could make mental notes; I had to scrounge around for pens to fill out official paperwork because mine were constantly disappearing from my remotely located desk; but the worst thing was my desk had to be against the wall with my back to the door, and at least once a week some impromptu meeting would assemble right behind me in that storage room, with the participants oblivious to my presence so that at least one guy's kiester would be brushing up on my shoulder...try problem-solving when ya got dude butt in stereo 🤬

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If I measured correctly, this should be the correct "O" ring for the oil pump cover.

Square-Profile Oil-Resistant Buna-N O-Rings

4061t116-@halfx_636993896957439551.png?v
 

With flat edges on all four sides, square-profile O-rings cover more surface than round-profile O-rings for a better seal in static applications, such as hose, pipe, and faucet connections. They’re made of Buna-N, which is resilient and offers excellent tear resistance. They resist hydraulic oils and motor oil.

Inch O-rings have a dash number and are sized to the SAE standard AS568.

3D CAD models availableFor technical drawings and 3-D models, click on a part number.

Inch
1170n11-1568216396-p9@halfx_637037952232
 
 
Fractional
Actual
             
Dash
Number
ID OD ID OD Hardness Specifications
Met
Temperature
Range,
°F
Color Pkg.
Qty.
  Pkg.
Wd.: 3/32 Fractional (0.103" Actual)
                       
143 2 7/16 2 5/8 2.425" 2.631" Durometer 70A (Medium) ASTM D2000, SAE AS568, SAE J200 -30° to 212° Black 50 4061T189 $7.86
 
 
 
 
 
1 pack of 50 added to your order.
Ships today
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43 minutes ago, Jerry Roberts said:

I don't know if that will work or not . but see ebay number  273009564468

Makes you wonder how effective it will be????  States no cracks, somewhat pliable.

Edited by DJK
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On 1/13/2021 at 7:02 PM, Young Ed said:

Been a few stories of new ones seizing up. I think I'd go new but check it carefully. I wonder if you could rig something to spin it a bit with a cordless drill ?

I can attest to this, got a new oil pump, Melling M37, for my 230. Span just fine when in a oil bath to prime it and when turning under starter only, but the first time I fired the engine up it locked up and broke two teeth off.  Now I'm getting another new pump (Free this time, Yay...?) and get to clean out the oil pan completely to remove the broken metal so I can try firing it up again

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