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Oil pump priming tool

Discussion in 'Early CJ5 and CJ6 Tech' started by sparky, Jul 26, 2006.

  1. Jul 26, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    sparky, Jul 26, 2006
    #1
  2. Jul 26, 2006
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
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    Man if you guys want priming tools yell, I built a really nice one for mine that fits in a 3/8 cordless drill. We'll talk price later.
     
    Mcruff, Jul 26, 2006
    #2
  3. Jul 26, 2006
    vanguard

    vanguard

    Is there some reason, I can't just turn the motor over with the coil disconnected?
     
    vanguard, Jul 26, 2006
    #3
  4. Jul 26, 2006
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
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    Sure, the motor will not have oil pressure for about the 1st 15-20 seconds and the crank and everything will be spinning under load. The oil pump will start up dry other than the vaseline you put in it and at that point you don't know for sure that the pump is gonna work at all, at least with priming the pump you know you have the oil in the block, pump and on the bearings and the pump will make pressure instantly.
     
    Mcruff, Jul 26, 2006
    #4
  5. Jul 26, 2006
    vanguard

    vanguard

    So how much for a tool? R)
     
    vanguard, Jul 26, 2006
    #5
  6. Jul 26, 2006
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
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    Can you ship Beer?:D
     
    Mcruff, Jul 26, 2006
    #6
  7. Jul 26, 2006
    vanguard

    vanguard

    Probably. R)
     
    vanguard, Jul 26, 2006
    #7
  8. Jul 26, 2006
    mortten

    mortten I can’t put my finger on it 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Peninsula, Ohio
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    I don't want to cut into Mcruff's profits but I cut the handle off of an old screwdriver and chucked it up in a drill.
     
    mortten, Jul 26, 2006
    #8
  9. Jul 26, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    Related question, why the vasoline per the FSM? I was under the impression it created suction to prime the oil pump?

    I understand that it doesn't oil the rest of the engine just putting vasoline in the oil pump, but I thought that it was necessary to create suction to start the oil flowing?
     
    sparky, Jul 26, 2006
    #9
  10. Jul 26, 2006
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
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    It is to provide a suction to prime the pump with oil but if you start the engine up without priming the pump the engine will run for about 10-15 seconds with no useable oil pressure at all, you have to remember the pressure reading is just past the pump not the return line on the motor. You could have pressure at the pump but you're still filling the block and bearings with oil for the next 5-8 seconds or so.
    Cranking the engine withthe starter primes the pump but everything else is moving with virtually no lube until the pressure builds, much safer to do it with a priming tool.
    Screw drivers do work OK but if you slip you take a chance of burring up the tip of the oil pump shaft. Mine just barely fit the distributor to start with, so I wasn't taking chances.
     
    Mcruff, Jul 26, 2006
    #10
  11. Jul 26, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    Ok, this is what I'm asking about. So, if you have a pump priming tool and stick it in there with no vasoline in the pump will it still prime, guess I didn't phrase my question well enough.

    I mean it's not there just to "lubricate" the oil pump gears is it? If that's the case, why not use assembly lube?
     
    sparky, Jul 26, 2006
    #11
  12. Jul 26, 2006
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
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    No it will not prime for several minutes if at all and will probably heat the pump up bad enough to damage it. Assembly lube is not thick enough and the manuals I have seen say specifically not to use grease. You have to remember most engines don't suck oil more than an few inches or so to prime themselves the Buick motors suck oil about 16"-20" to prime themselves.
     
    Mcruff, Jul 26, 2006
    #12
  13. Jul 26, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    That's what I wanted to know. :)
     
    sparky, Jul 26, 2006
    #13
  14. Jul 26, 2006
    tinker

    tinker GNGPN

    winnipeg,manitoba...
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    The grease can plug the oil filter while the vasoline will dissolve into the oil with a little heat from the engine .
     
    tinker, Jul 26, 2006
    #14
  15. Jul 26, 2006
    w3srl

    w3srl All-around swell dude Staff Member

    Port Orange, FL
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    Don't feel bad Sparky, I made the same mistake about 20 or so years ago with my father-in-law's MB. I didn't know about packing the pump with vaseline, and it ran with only the assembly lube for about 2-3 minutes. :oops: I shut it down, and finally figgered where I went wrong. One of the Army TM's I had on hand mentioned cutting the top off a quart can of 30wt oil and submerging the pump in it as you spun the shaft back and forth by hand; this served to completely fill the pump cavity with oil so it can create suction. I've done this with evry rebuild since and I've had instant oil pressure on startup. :D
     
    w3srl, Jul 26, 2006
    #15
  16. Jul 27, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    I didn't not put vasoline in the pump gears. I have a FSM. ;)

    I was just asking for clarification.
     
    sparky, Jul 27, 2006
    #16
  17. Jul 28, 2006
    bswindale

    bswindale New Member

    Sister Lakes, MI
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    Is it possible or effective to prime the pump and passages by pumping oil into the gallery through the oil pressure switch hole? I don't see a check valve anywhere so I don't know if all the oil would just flow through the pump and into the pan. This may prime the pump, but not help the bearings. This is on an F-head, not rebult, but just not run for 6 years.
     
    bswindale, Jul 28, 2006
    #17
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