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Thread: Overhauled o-200 no oil pressure

  1. #1
    Doug Budd's Avatar
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    Overhauled o-200 no oil pressure

    I bought an overhauled 0-200 split the case and put a different cam in it. Now I have zero oil pressure. I pressurized the case and turned the engine over to prime it and as long as I had pressure to the case I had oil pressure. The only thing I did different is I left the gear off the front of the cam that drives the vac pump. I didnít want the gear slinging oil up and out of the breather tube. Any ideas?


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    Steve Pierce's Avatar
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    I had a friend with the sme issue. Brought me the engine and I found blue painters tape wrapped around the oil pick up tube. Is the pressure oil you are putting through the engine making it to the pump? If the pump has lost it's prime you could have oil in the entire system but it won't pump. Where are you pressurizing it. The three bolt plate on the left side of the engine is a good place, one hole goes around the crankcase and the other to the pump. I can't remember which is which.
    Steve Pierce

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  3. #3

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    wasnt there a deal where that gear goes needs a plug put in?? theres a good thread on here somewhere about a plug needed in the cam.
    Last edited by tempdoug; 07-11-2018 at 06:53 AM.

  4. #4
    Doug Budd's Avatar
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    Pick up tube is good I put 20lbs threw the case vent. I have a oil cooler running off the three bolt plate I tried putting oil through the top hole to get oil to the pump. I took the sump and accessory case off to look at pump and had oil everywhere except the top end.


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  5. #5
    Doug Budd's Avatar
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    Quote Originally Posted by tempdoug View Post
    wasnt there a deal where that gear goes needs a plug put in??
    Thatís what I was wondering but I wanted more input before I split the case


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    i searched some but cant find it yet, its on here somewhere.

  7. #7
    Doug Budd's Avatar
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    Quote Originally Posted by Doug Budd View Post
    Thatís what I was wondering but I wanted more input before I split the case


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    http://www.supercub.org/forum/showth...aft+gear+bolts go about to post 20, and then read post 39.
    Last edited by tempdoug; 07-11-2018 at 07:21 AM.

  9. #9
    Doug Budd's Avatar
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    I wonder if itís just the bolts that need put in and if I can do it through the vac hole. Iím on my way to the airport now to see what it looks like.


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  10. #10
    Doug Budd's Avatar
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    Thanks for the help Steve and tempdoug. Guess I will go split the case


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  11. #11
    brown bear's Avatar
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    been there dun that . Oil goes out front of cam if you leave the gear off . You can make a plate and bolt it on the cam without splitting the case, it's not eazy but we did it through the vac. pump hole .
    Doug
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  12. #12
    Doug Budd's Avatar
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    Quote Originally Posted by brown bear View Post
    been there dun that . Oil goes out front of cam if you leave the gear off . You can make a plate and bolt it on the cam without splitting the case, it's not eazy but we did it through the vac. pump hole .
    Doug
    Iím going to try going through the hole. Do I need to make a plate or just plug the bolt holes


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  13. #13
    brown bear's Avatar
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    We made a plate out of 1/4" alum. useing the gear as a pattern , I dont think our cam was taped for a plug ? Putting a plate on through the vac. pump hole is not as hard as you might think , the hardest part ws safty wireing the bolts .

    Doug
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  14. #14
    brown bear's Avatar
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    After thinking about it , I do not remember if the oil came out the bolt holes or if there is another hole in the cam ? , but I do rememberwe made a plate ?, to many years ago .
    Doug
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  15. #15
    tcraft128's Avatar
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    I had the EXACT SAME ISSUE!!! you do not have to have the gear installed, just the bolts. I got shorter drilled bolts and installed them onto the cam and safety wired the heads. I had an -F case with the fuel pump drive cover so I could do it without splitting the case again.
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  16. #16
    tcraft128's Avatar
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    If you go to the other thread and look at the pictures of the cam Charlie Aileron posted, what is happening is the oil crossed from one side of the case to the other in the front through the valley between the pad for the gear and the journal right behind it. Without the gear or the bolts, it is spilling all the pressure out of the holes and back into the case. One half of the engine is getting oil, the other is not. The side that is not is the side where the oil psi fitting is fed, happens to be at the end of the flow.
    Turning money into noise since 1996

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  17. #17
    Doug Budd's Avatar
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    Thanks for all the input. I split the case and put the gear on the cam. Started out to put just the machine screws in but they were too long so I put washers on, didnít work because the cam is recessed in the case just enough not to fit in the journal. I donít have a lot of time to do this so to make it faster I put the gear back on . I added a couple inches to the vent elbow hope it stops the dirty belly. Thanks again for the help.
    Doug


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  18. #18
    Doug Budd's Avatar
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    Sorry got distracted on the last post . The washers wouldnít work because they were wider than the end of the cam and stuck over the edge so it wouldnít let the cam all the way into journal.


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