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914 Turbo Servo problem

  • willy
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3 years 1 month ago #11596 by willy
914 Turbo Servo problem was created by willy
Seems like I have an issue with my wastegate servo motor on my 914. It was working properly till today. Yesterday I worked on the plane and flipped the tcu switch off in order to avoid the controller to work while I was doing some electrical work in the panel with the master on. Today before starting the plane I flipped the TCU on before starting the engine and everything seemed fine for few minutes then I seen the turbo light flashing so I went back to the dock (on floats) to make some test just to realize the servo barely move when I flip the master on. The plane/engine has 110hrs, Is that common to change the servo motor?? I thought it was more sturdy than that. Is there any fix or I need to order a new part?

Thanks.

Eric.
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3 years 1 month ago #11603 by RobSeaton
Replied by RobSeaton on topic 914 Turbo Servo problem
make sure the cable is not wrapped up or kinked. Then test it again making sure the TCU switch is ON and the throttle is at idle before turning on your master switch.
you should not have to replace the servo, that would be very unusual as they are very durable.
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3 years 1 month ago #11606 by willy
Replied by willy on topic 914 Turbo Servo problem
Thank you Rob,

You may be right, when I put the master on I can hear the servo making noise and move just a bit but I cannot see where the cable could be jammed or kinked. I tried to force it to move with my fingers and can have it to cycle with help so I thought the motor could be tired and not powerful enough to pull the spring on the waste gate. I may try to replace the cable at first thing.
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3 years 1 month ago #11607 by RobSeaton
Replied by RobSeaton on topic 914 Turbo Servo problem
try removing the cable and see if it makes its proper cycle, approximately 100 degrees of travel. (from the 8:00 o'clock position to the 12:00 o'clock position and then return to the 8:00 o'clock position)

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11 months 7 minutes ago #17823 by Wang Shu
Replied by Wang Shu on topic 914 Turbo Servo problem
can any explain the servomotor for 914 engine life? when it required to replace? or servo motor replace with TBO?

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10 months 4 weeks ago #17826 by RobSeaton
Replied by RobSeaton on topic 914 Turbo Servo problem
It is an on-condition component.
The servo is checked at overhaul but not replaced unless it fails the test.
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2 months 6 days ago - 2 months 6 days ago #20252 by juan.e.ariza
Replied by juan.e.ariza on topic 914 Turbo Servo problem
I had a similar adventure with my 914, flew for hours the dau before, just felt I did not have enough power. After resding this article I took the servo apart and found that, the motor gets shorted and it will melt the impeller guide causing the motor to bind against the wall.
ordered a new part as this one is totaly toasted. Another issue I found is that once the motor gets hot the hrease imside will melt causing the motor to act normal wile cooking in its own sauce.. giving the impression that there is with fuel.

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Last edit: 2 months 6 days ago by juan.e.ariza. Reason: spell checked

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2 months 6 days ago #20255 by Jungleman
Replied by Jungleman on topic 914 Turbo Servo problem
Eric.
A few months ago I had one cease at the 8 oclock position, 180 hrs since new. It also failed the resistence check outlined in the maintenence manual.
Fitted a new one & the last 100 hours have been trouble free.
Peter

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2 months 5 days ago - 2 months 5 days ago #20270 by RobSeaton
Replied by RobSeaton on topic 914 Turbo Servo problem
looks like water got inside that servo
Last edit: 2 months 5 days ago by RobSeaton.

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