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Thread: Need Help Running Hot

  1. #1
    Evan's Avatar
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    Need Help Running Hot

    OK I have a 0320 150 hp it started running a little hot last summer over the winter no problems this summer temps were getting 230/240
    so i checked and re checked the baffling. Next i brought to ap he checked changed the vtherm still hot next new eci titan cylinders still running hot
    next was the rear mount cooler it was a older aluminum cooler that Niagara crossed to be equal to there 20002 model so i ordered the larger 20003 model with 9 rib core
    new lines installed to cooler checked the cooler line placements where they come to and from cooler, engine oil pressures good but still running 230/240
    1400 hrs on bottom cam everything looked good when cylinders where changed . I just don't know what else it would be but please give me your ideas
    what am i missing ? oh and let me say it doesn't just go straight to hot quick it takes about 30 mins to get there, and we checked the temp gauge its right

  2. #2
    www.SkupTech.com mike mcs repair's Avatar
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    crosswinds http://www.crosswindsstol.com/ sells a fiberglass lip that goes/rivets on the bottom cowl for with their rear mount cooler or engine kit or?? or something??...

    not sure if he will sell it without his kit/STC.....

  3. #3

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    Timing ?

    Louis

  4. #4
    Evan's Avatar
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    Checked timing

  5. #5
    Tim's Avatar
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    Do you have the oil cooler plumbed correctly? Oil should go in the bottom and out the top or you'll get air pockets in the cooler.

  6. #6
    Evan's Avatar
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    Tim its not plumped that way it was aways plumbed high pressure side in the top discharge out the bottom could that be the problem
    any experience with this? i have heard that but the ap's here say it did matter but ill try it let you know

  7. #7

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    My C90 is runnning a little hot too. 215-220....then I was taxiing up to the dock and switch failed....couldn't turn off.....not a big deal, unless you are approaching a dock on floats! Do you suppose my mag switch crapped out....or have you heard of hot engines continuing to run because of hot deposits???/someone told me that was possible. I think I need an outlet on the bottom of the cowl for the cooling, but the mag switch problem seems intermitten.....any suggestions?

  8. #8

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    If you have "Blow-by" past the rings the hot gases wind up heating the oil.

    Compression?

    There is a check using a ASI as a manometer but I don't have figures.


    HOW did you check the baffles?

  9. #9
    Tim's Avatar
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    Evan, do you have a CHT instrument? If so what are the temps.? If your CHTs are 350 to 370 in cruise and your oil temp is still high, I'm not sure what it is. If your CHTs are 400 or higher, I'll PM you what it might be.

    Tim

  10. #10
    www.SkupTech.com mike mcs repair's Avatar
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    Quote Originally Posted by Dan Gervae View Post
    My C90 is runnning a little hot too. 215-220....then I was taxiing up to the dock and switch failed....couldn't turn off.....not a big deal, unless you are approaching a dock on floats! Do you suppose my mag switch crapped out....or have you heard of hot engines continuing to run because of hot deposits???/someone told me that was possible. I think I need an outlet on the bottom of the cowl for the cooling, but the mag switch problem seems intermitten.....any suggestions?
    yes mag switchs go bad, there is an AD about this on the bendix brand switch...

    http://www.ercoupe.net/ads/76_07_12.html

    here part of it, more at the page above...

    76-07-12

    BENDIX IGNITION SWITCHES

    Amendment 39-2575 as amended by Amendment 39-3024

    Applies to All aircraft employing magnetos and using Bendix ignition switches
    listed in the table below except switches identified by four digit date code (new)
    adjacent to the model number or a white dot (modified) on the support plate
    adjacent to the Bendix logo.

    Rotary Action,
    Bendix Switches Key or Lever Actuated
    Switch Function Bendix (series) Part Numbers
    Twist-to-Start 10-357XXX, 10-126XXX
    Twist-to-Start/Push-to-Prime 10-357XXX, 10-126XXX
    Push-to-Start 10-357XXX, 10-126XXX, 10-157XXX

    Compliance required as indicated:

    1. For switches subject to this AD, conduct the following checks within the
    next 100 hours' time in service and each 100 hours thereafter to detect
    possible switch malfunction:

    (a) Observing regular ground run-up procedures, allow the engine to
    reach operating temperatures and perform a normal magneto check.

    (b) With the engine at normal idle, rotate the switch key or lever through
    the "OFF" detent to the extreme limit of its travel in the "OFF"
    direction.

    (c) If the engine stops firing, this indicates an airworthy switch.

    (d) If the engine continues to run with the switch in the extreme "OFF"
    direction indicating a malfunctioning switch, prior to the next flight
    accomplish Part III outlined in Bendix Service Bulletin No. 583, dated
    April 1976, for Repair and Replacement or use an alternate method
    approved by Chief, Engineering and Manufacturing Branch, Eastern
    Region.

    2. The aircraft may be flown in accordance with FAR 21.197 to a place
    where these modifications can be accomplished.

    3. The checks required by this AD may be performed by the pilot.

    4. Upon submission by an operator with substantiating data, an FAA
    Maintenance Inspector subject to prior approval of the Chief, Engineering
    and Manufacturing Branch, FAA Eastern Region may adjust the
    compliance times specified in this AD if the request contains
    substantiating data to justify the increase for the operator:

    NOTE

    If the engine continues to run when complying with paragraph 1 and
    repair or replacement cannot or will not be accomplished immediately,
    the magneto (primary circuit) should be grounded in accordance with
    Bendix Service Bulletin No. 583, dated April 1976.

    Amendment 39-2575 was effective April 14, 1976.

    This amendment 39-3024 is effective August 30, 1977.

  11. #11
    DUSTERMAN's Avatar
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    Evan could your engine be running lean. Not sure what other equipment on your engine. I remember my mechanic telling me that they had to richen up a carb on an o-320 when they put on upgrade exhaust.

  12. #12

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    Two things come to mind, one, a bad -New vern, the second is the verns housing assembly. They wear out and most likely it's one or the other or even both. I've experienced both situations. remove the oil filter/vernatherm base and boil in water for test. Lycoming has a seat resurface tool but bases are affordable especially the after markets.
    Last edited by Fortysix12; 08-11-2011 at 08:57 AM.

  13. #13

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    Evan, Obviously you're using too much Slap your Momma

    Kirby
    Remember, These are the Good old Days!

  14. #14
    windy's Avatar
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    To rule out the vernatherm, you could try putting in the spring and ball and see if the oil overheats.
    What's the oil pressure been when the oil's running too hot?
    Last edited by windy; 08-11-2011 at 09:28 PM.

  15. #15
    behindpropellers's Avatar
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    gauge working correct?

  16. #16

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    When we we're there a few weeks ago we talked through most ideas tossed out. Evan has gone after them all to no avail.

    Veri-thingy in/out
    Gauge checked
    Cabin heat inlet plugged for the season – plumbed not the issue
    No change after topping it with new cylinders
    This is a nice L21 that was converted to a 150 with a cruise prop.

    His temp is a steady climbing (temp, it Louisiana they don’t climb) event with a cruise power setting at sea level in warm humid conditions.

    He's not running it terrible hard but we did notice while there playing that our fuel burn and oil consumption was higher than normal,,, I backed the RPM off a bit for being at sea level and that made a difference but I still burned more fuel and oil than at home and we’re not high by any means and none of the other 4 cubs (including Lance’s Green Hornet which has to work pretty hard to keep up with us speed wise) were running anywhere near hot.

    Any chance he could have spun a bearing that has not revealed itself in other ways?

    Kirby
    Last edited by OLDCROWE; 08-12-2011 at 10:06 AM.
    Remember, These are the Good old Days!

  17. #17
    SteveE's Avatar
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    Evan says its not a good time to buy granite from him... your going to get gouged!

  18. #18
    windy's Avatar
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    My oil temperature was running hot like that, tried all the tricks you did. On the way back from OK18, in Liberal, KS, Flip's oil temp reached the red line. I'd had enough, so if it was going to sieze up, it might as well do it in Kansas, where the whole state is a landing area. I decided to help the oil boil more, so gave it full power, without climbing, which sped up the air speed. Lo and behold, the oil temperature dropped 20F. My problem was not enough air flow over the oil cooler, so higher power settings are needed to keep oil under the red line in the summer. I use more fuel too, and especially more fuel when I'm down closer to sea level.

    oil flow
    air flow
    surface area

    the oil temperature heat problem is something to do with one of them, you can bet on it.
    Last edited by windy; 08-12-2011 at 09:28 AM.

  19. #19
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    I decided to help the oil boil more, so gave it full power, without climbing, which sped up the air speed. Lo and behold, the oil temperature dropped 20F. My problem was not enough air flow over the oil cooler, so higher power settings are needed to keep oil under the red line in the summer.

    When I attempt to save a little fuel by cruising at 2200-2300 (150,A2B) my oil temp indicates approximately 210-220 (OAT 75, leaned). Increasing to 2400, temp drops to about 190 (rich) and 200 (leaned). I've often wondered what effect the root design of the propeller has on airflow to the cooler. Gary
    Last edited by Cub@H20; 08-12-2011 at 09:15 PM.

  20. #20
    Evan's Avatar
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    Mine just the opposite runs cool at low rpms hot above 2200 rpm's took engine off today going to split case rebuild
    (put some fresh slap ya momma in it)

  21. #21
    Pokette's Avatar
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    I have a 0-200a that has had some issues
    If I run at 75% power I am close the maximum oil temperature.
    If I run at 65% it drops 10 degrees.
    (on a 90 degree ambient day)

    So... I say....
    Install a lower lip or better yet cowl doors from CubCrafters

  22. #22
    Evan's Avatar
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    Ok engine bottom shot scaring on crank on bearings
    Crank already turned so what's the options new crank or find a Serviceable crank Click image for larger version. 

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  23. #23

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    Evan,

    So there you have it, too much "Slap" and will burn you bottom every time!

    Seriously though very sorry to see that as the issue, but you'll essentially be fresh under the hood after this little set back.

    I know some on here have used them too but I would give Aircraft Specialities http://www.aircraft-specialties.com/ in Tulsa (of course) a call for re-manufactured cranks and other needs. If you end up doing business there let us know if there is anything we can do to help from this end.

    Kirby
    Last edited by OLDCROWE; 08-15-2011 at 09:14 PM.
    Remember, These are the Good old Days!

  24. #24
    Steve Pierce's Avatar
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    How much under is the crank? Give bob at AC Specialties a call and he can either turn it or has one for sale. Get that case done as well.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers

  25. #25
    nutter3's Avatar
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    Quote Originally Posted by OLDCROWE View Post
    Evan,

    So there you have it, too much Slap and you'll burn you bottom every time!
    So is there something that is done to an engine to cause this? Too fast on throttle changes, to fast cooling, too short of a preheat? I'd like to learn from Evan's misfortune so I dont have similar problems. Our 0-360 seems to run real hot as well, and the previous owner said that it always ran hot. I am searching for ways to determine if we have a problem with the sensor, or if it really is running close to redline.

  26. #26

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    FYI - Slap is an inside joke http://slapyamama.com/ use too much and it will burn for days!
    Last edited by OLDCROWE; 08-16-2011 at 06:27 AM.
    Remember, These are the Good old Days!

  27. #27
    Amy's Avatar
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    Quote Originally Posted by OLDCROWE View Post
    FYI - Slap is an inside joke http://slapyamama.com/ use too much and it will burn for days!
    Boy I was terrified to click that link . . .
    Proud owner of a collection of airplane pieces (sometimes in one big piece) known as the Oklahoma Kid.

  28. #28

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    Quote Originally Posted by Amy View Post
    Boy I was terrified to click that link . . .
    Yea Amy, but did ya'
    Remember, These are the Good old Days!

  29. #29
    Amy's Avatar
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    Quote Originally Posted by OLDCROWE View Post
    Yea Amy, but did ya'
    I ponied up the guts to do so and figured it would at least be an interesting explanation if anyone ever asked what on earth I was doing . . . So I bit the bullet and clicked it! Don't I just live an exciting life?
    Proud owner of a collection of airplane pieces (sometimes in one big piece) known as the Oklahoma Kid.

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