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Thread: Low oil presure on rebuilt c90-8

  1. #81

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    dont use anything. using a sealant on the cover is probably some of the reason oil was coming out that gear hole.
    Last edited by tempdoug; 11-21-2018 at 04:35 PM.

  2. #82
    cubdriver2's Avatar
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    Quote Originally Posted by tempdoug View Post
    dont use anything. using a sealant on the cover is probably some of the reason oil was coming out that gear hole.
    Make sure you lap it

    Glenn
    "Optimism is going after Moby Dick in a rowboat and taking the tartar sauce with you!"

  3. #83

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    Quote Originally Posted by tempdoug View Post
    dont use anything. using a sealant on the cover is probably some of the reason oil was coming out that gear hole.
    Tempdoug it makes sence, next im gonna to use anything there! But if the parts are plain, it wouldn't lick any oil right??

  4. #84

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    Quote Originally Posted by cubdriver2 View Post
    Make sure you lap it

    Glenn
    Glenn, i need to send my case to someone that does this service or there is some way to lap it??
    Thanks guys for your helping!!!
    Hudson

  5. #85

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    these guys do excellant work, http://www.divcoinc.com/ but find out what it costs to fix first, could you show a higher up picture of your accessory case, if its magnesium and not aluminum i dont think you can get it fixed anywhere and will need to look for another. do you want to spend any money on fixing it or not??

  6. #86

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    Quote Originally Posted by tempdoug View Post
    these guys do excellant work, but find out what it costs to fix first, could you show a higher up picture of your accessory case, if its magnesium and not aluminum i dont think you can get it fixed anywhere and will need to look for another. do you want to spend any money on fixing it or not??
    TempDoug tomorrow im gonna see if a find other case, one friend of mine has one and if it looks good im buying it, if not i would need fix it!!

  7. #87

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    I just had a similar problem , we overhauled my c90-8 . It started up with good oil psi but after flying, oil psi went to next to nothing on approach and landing (washers don’t work for this issue) . I sent a different accessory case to divco. It was not repairable, so I bought an overhauled one from divco. I bought a new oil pump, new plunger and spring. All is well now. The seat on the New case for the plunger is much more pronounced then the other case. They can repair aluminum cases but not magnesium ones. They said mine was to saturated with oil and wasn’t weldable . Good luck.

  8. #88

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    Quote Originally Posted by elizair View Post
    I just had a similar problem , we overhauled my c90-8 . It started up with good oil psi but after flying, oil psi went to next to nothing on approach and landing (washers don’t work for this issue) . I sent a different accessory case to divco. It was not repairable, so I bought an overhauled one from divco. I bought a new oil pump, new plunger and spring. All is well now. The seat on the New case for the plunger is much more pronounced then the other case. They can repair aluminum cases but not magnesium ones. They said mine was to saturated with oil and wasn’t weldable . Good luck.
    Hi Elizair!!
    Good to know that!! Tomorrow im looking other case with good pump housing and will try again!! Yes, washer dont work (at true at first start the pressure go up with wasjer but after return to same pressure). Did you used any kind of seal in your pump plate and housing???
    Thanks!!!
    Hudson

  9. #89

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    I wouldn’t waste my time I’d get a yellow tagged accessory case. When I first started this problem they had some at fresno airparts. They may have more now. Divco may have more in stock. But i wouldn’t buy one that looked good . It just takes too much time. I paid 875 for the yellow tagged one.


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  10. #90

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    Quote Originally Posted by elizair View Post
    I just had a similar problem , we overhauled my c90-8 . It started up with good oil psi but after flying, oil psi went to next to nothing on approach and landing (washers don’t work for this issue) . I sent a different accessory case to divco. It was not repairable, so I bought an overhauled one from divco. I bought a new oil pump, new plunger and spring. All is well now. The seat on the New case for the plunger is much more pronounced then the other case. They can repair aluminum cases but not magnesium ones. They said mine was to saturated with oil and wasn’t weldable . Good luck.
    Hi Elizair!!
    Good to know that!! Tomorrow im looking other case with good pump housing and will try again!! Yes, washer dont work (at true at first start the pressure go up with wasjer but after return to same pressure). Did you used any kind of seal in your pump plate and housing???
    Thanks!!!
    Hudson

  11. #91

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    Guys!
    I got other case, an magnesium case ans installed on my engine but i didnt test it yet, im traveling this week, but on this weekend im testing it and talk here what happens!!
    Here is the other case:

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  12. #92

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    Guys
    Bad news...
    I ran engine yesterday with a new case and nothing changed, start at 60PSI and after 5minutes at 1000 and 5min at 2000 RPM's, oil press went to 18psi with no oil temp indication (i ran engine without engine cowls, and the day was about 23 Celsius).
    Tomorrow im gonna open engine, but im sure that my crankshaft and bearings are right (are m10), so what i need to look for?? My camshaft measures??
    Thank you!
    Hudson

  13. #93

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    Here some pics...
    Here 18Psi with no oil temp at 2000Rpm after 5minutres. At idle engine maintain 10Psi!
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  14. #94
    www.SkupTech.com mike mcs repair's Avatar
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    recheck oil screen again

  15. #95

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    Quote Originally Posted by mike mcs repair View Post
    recheck oil screen again
    Hello Mike
    Man, what i need to look for at oil screen?? If contain metal??
    Thanks a lot!!
    Hudson

  16. #96
    www.SkupTech.com mike mcs repair's Avatar
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    Quote Originally Posted by Hudsonedu View Post
    Hello Mike
    Man, what i need to look for at oil screen?? If contain metal??
    Thanks a lot!!
    Hudson
    yes

  17. #97

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    Quote Originally Posted by mike mcs repair View Post
    yes
    Ok Mike.
    Tomorrow im gonna to check!!!
    But for me open my engine is a sure...
    Thanks!
    Hudson

  18. #98

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    Guys.
    Today was a hard work day...
    I look my oil screen and had metal there, so we started to open engine... Tomorrow im gonna clean all parts and next week (maybe on friday, depends if measure shop will can attend me) im sending my engine to the shop to get all parts measured and aligned.
    Here the result for today...
    Metal on oil screen...
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    Hard work on it...
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    Here is cranckshaft without risks or marks, on bearings no risks or marks too... For us, that metal at oi screen comes from oil pump...
    Click image for larger version. 

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    Tomorrow im cleaning parts, so i will send more pics...
    Thanks!!!
    Hudson

  19. #99
    wireweinie's Avatar
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    I've got to ask: do you have the overhaul manual for a C-90?

    Web
    Life's tough . . . wear a cup.

  20. #100

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    Hello Web!
    Yes, we have...
    Thanks wireweinie thanked for this post

  21. #101
    cubdriver2's Avatar
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    Was the metal magnetic? Or just Alum? Alum flecks like that are not a big concern on a new overhaul.

    Glenn
    "Optimism is going after Moby Dick in a rowboat and taking the tartar sauce with you!"

  22. #102

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    Quote Originally Posted by cubdriver2 View Post
    Was the metal magnetic? Or just Alum? Alum flecks like that are not a big concern on a new overhaul.

    Glenn
    Hello Glen.
    I tested the screen today and the majority parts weren't magnetic. I imagine that its part of oil pump, there is some risks there.
    Today im gonna go with my shafts and cases to the measurements shop to see how re my case... Bellow the pics...

    Other case with the same problem...
    Click image for larger version. 

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    My case with no visible damage...
    Click image for larger version. 

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    Crankshaft with no damage too...
    Click image for larger version. 

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  23. #103

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    Guys!
    I made a cranck case overhaul and adjustments to fit in my cranckshaft measures and oil pump adjustments too.
    Today i just finished to assembly the engine and runned it, but was the same!!!!
    Its looks like that anything was done on the engine... Idk what to do now...
    When its stars, pressure goes to 65psi and 7minutes after is with 20...
    My question: in cylinders, there are some place to lost pressure??
    Other question: looking at "bowersflybaby" in " Continental A&C-Series Aircraft Engines Parts Interchangeability Catalogue" i saw that there are two kinds of hydraulic lifters, "531694 unit - valve lifter hydraulic (replaces 21609)", and"533399 unit - valve lifter hydraulic ( 3 to 6 second bleed-down" with this detail (3 to 6 second bleed-down) in use with C90 with steel camshafts #531076, that is mine, if i use the firs unit "531694" instead of the "533399" unit, can cause this problem?? What means this 3 to 6 seconds to bleed-down??

    Thanks for all!!
    Hudson

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  24. #104
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    Quote Originally Posted by Hudsonedu View Post
    Hello Glen.
    I tested the screen today and the majority parts weren't magnetic. I imagine that its part of oil pump, there is some risks there.
    Today im gonna go with my shafts and cases to the measurements shop to see how re my case... Bellow the pics...

    Other case with the same problem...
    Click image for larger version. 

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    My case with no visible damage...
    Click image for larger version. 

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    Crankshaft with no damage too...
    Click image for larger version. 

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    That oil pump housing looks pitted and scored in the picture. If that's correct it could sure explain your problem.
    Gordon

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    My SPOT: tinyurl.com/N4328M (case sensitive)

  25. #105

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    Quote Originally Posted by Gordon Misch View Post
    That oil pump housing looks pitted and scored in the picture. If that's correct it could sure explain your problem.
    Hi Gordon!
    Yes, we imagined that so we changed the case but used other that oil pump gears was "bushed" due to clearance...
    Can the oil pump do it again???

  26. #106
    Gordon Misch's Avatar
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    Quote Originally Posted by Hudsonedu View Post
    Hi Gordon!
    Yes, we imagined that so we changed the case but used other that oil pump gears was "bushed" due to clearance...
    Can the oil pump do it again???
    I would expect that the Continental table of limits would have detailed information about all of the clearances. I know the Lycoming overhaul manual has numerous oil pump dimensions specified, but I am not familiar with Continental details.
    Gordon

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  27. #107
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    When metal warms, it moves slightly.

    Hairlines cracks will show when the engine warms up, could there be an internal crack somewhere that opens once warm? I have seen a couple case cracks that could only be found with dye penetrant or other NDT methods... except for a slight oil slick bleeding out of the crack in flight.
    I don't know where you've been me lad, but I see you won first Prize!

  28. #108
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    Another thought if not already mentioned. On a 0-200 If using a b&c starter and didn’t replace the pressed needle bearing with the plug there will be a internal oil leak. A c90 might be different though


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  29. #109
    1piece@atime's Avatar
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    Sorry, I just noticed you don’t have a starter


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  30. #110

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    I agree with Gordon, that oil pump housing looks worn out. I believe Divco can fix it if it’s not magnesium.

  31. #111

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    Guys, today a new test with other oil gauge and a new oil pump, and was the same! All engine sizes are ok, oil pump remade with all tolerances ok, idk what is doing that!
    I have doubt about the oil gallery near prop, because some people said that when use radiator need to do something and without radiator need to do another thing, so some guy here know what i need to check in the oils gallerys role in front of case???
    Wrong hyd lifters can couse this problem??
    I did read once that says a difference in seconds to deflate, someone knows about that???
    Thanks!!!


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