Shawn Li's RV-7 Construction Log

  • Home
  • Construction Log by Dates
  • Construction Deviation and Analysis
  • RV-7 In Action
  • Analysis
  • Phase I Log
  • On Going Maintenance
  • Maintenace Info


11-17-2013: 4 hrs

It's been very frustrating today, trying to figure out the installation of the throttle body. The CHT sensor installation is easy though. The instruction on this is very limited. The throttle body is from Lycoming, coming with the engine. It's AVSTAR model AVX-5AV1, and I couldn't find much info online either. The pictures I can find don't match what I have. Anyway, spending quite bit time to read various installations (even not the same type of throttle body), I got an idea what to do. I trial fitted the throttle body, then realize that the throttle and mixture control arms need to be re-adjusted. It should be easy after figuring it out how the assembly works.

Then I installed the throttle cable bracket, it's a relatively easy job, no problem, just a little difficult to safety wire the two bolts due limited space. Moving on to the mixture control cable bracket, I found the cable is about two inch short, that I can't attach the cable to the bracket using the two  nuts on the cable. After tweaking around a bit, I found I can strech the cable a bit longer if I adjust the routing a bit. I drilled a hole on the rudder pedal brace so the mixture cable can cross right through it. That extra length made the cable attachment to the bracket possible, even just barely.


Label for CHT sensor, just a shot for reference


Just a picture showing the CHT sensors


The CHT sensor adaptor is installed to cylinder head


Another shot


Sensor is then installed to the adaptor. The length of the sensor needs to be adjusted for appropriate spring load


Pictures showing throttle control cable bracket installation


The plate screwed to the inlet air plenum is removed. Throttle body will be installed here


Throttle body is on


Mixture control arm at ICO (idle cut off) position


Throttle control arm in idle position


Throttle control arm in full open position


Throttle cable bracket is mounted to engine, and safety wired


The clearance between throttle cable and exhaust pipe looked good


Another picture showing the clearance


Mixture control cable bracket is mounted to engine as well


Mixture control cable bracket


The cables has to be re-adjusted at the fwd mounting bracket so the mixture cable can be mounted to the bracket on the engine



To adjust the length, the mixture cable passes through rudder pedal brace like this


Now the mixture cable can be secured to the bracket that is mounted on the oil sump flange


Bell crank for mixture control is installed


<<Previous |  Home| Next>>

Make a free website with Yola