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IainClarke
Joined: 13 Aug 2015
Posts: 3
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 Posted: Sun Sep 16, 2018 8:07 am Post subject: Smooth Throttle Action. |
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Recently I found my throttle cables were not operating in unison so purchased a set of new throttle cables from Europa. On fitting the cables I found that the cables operated acceptably on applying power but on reducing power the movement was somewhat notchy and I was unable to make small reductions in power smoothly. For me this was not acceptable. I tried reducing the size of the nylon washers but to no avail. I tried changing the carb springs to a less powerful version, no joy. Various routings of the cable made no improvement.
As I am the second owner of my aircraft I noticed the original builder had used short cables with no real bends in the cables and smaller than plan nylon washers and so suspected he had suffered similar problems. Accordingly I elected to shorten the long new cables believing the considerable length of the new cables may be producing too much friction to allow a smooth throttle operation. So all parts removed and the cables shortened in an effort to reduce the friction. Refit and still no joy !!!!!!
I was becoming pretty irked. Thinking I may have received a one in a million set of duff cables I ordered another set of cables from Europa. This is the point where I began to think outside of the box, no pun intended (Throttle Box).
I connected one of the new cables to a carburettor in a straight line with no throttle box connected and no bends then I physically pulled the inner cable through the outer. I found on pulling against the throttle spring, i.e. reducing power the action was notchy and by no means smooth. This eliminated the washer system being the problem. It could only be the inner cables rubbing on the outers. Bingo.
I carried out some research which resulted in my sourcing two 1.5m lengths of TEFLON lined outer cable. I was able to remove the inner cable ends from the shortened inner cables and fit them to some new inner cable. They were removed by heating and pulling them out with pliers and drilling the remaining cable out.
When operating the throttle I also noticed inside the throttle box the metal washers on either side of the nylon washers were rotating. To stop this I braised one of the metal washers to the nut securing the spacer and braised the other metal washer to the torque nut. I also fitted new nylon to plan sized washers. This worked well and stopped everything rotating.
Once assembled the throttle action worked smoothly with no notchy movement on reduction of power. Also as the cables were moving in unison very smoothly carb balancing was made easy.
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JonathanMilbank
Joined: 14 Apr 2012
Posts: 388
Location: Aberdeen area
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| Posted: Sun Sep 16, 2018 11:52 am Post subject: Re: Smooth Throttle Action. |
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Now that's what I call perseverance!
| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Europa-List |
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