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HelicopterAlignT-REX 600N › Trex 600N and Hyper 50
06-07-2009 05:10 AM  8 years agoPost 1
Simmer

rrElite Veteran

Massachusetts

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The Trex600N is haveing really inconsistant engine issues. Ill fly for one tank or maybe two, runs fine, cool and great as ever, then the next tank or in the middle it gets hot, I can hear it and I have to open the needle a full 1/2 turn more to keep it cool enough. (normally I run at 1 1/4 open This one is just weird. New fuel lines, filter, pulled the back off the engine and it looks fine, no bearing wear or noise, no visible signs of trouble. All new fuel lines, new fuel filter, head bolts tight even replaced the needle valve o ring. Just odd that it will run so well for a tank or two then I can hear it get lean and land to test and its hot. real hot. I dont know what to try next. Have a new OS 50 ithat I could toss in but this one seems to run great. Hate to pull it when it seems to be a great running motor. 2 years old. Maybe its just time?

The old fuel filter had some stuff in it (sullivan crap trap) when I replaced that I got three tanks in with no issues, I thought I had this one resolved. Now not sure whats next to do. May end up changing the fuel lines again. Perhaps the heat effects them ? maybe they constrict? I generally wait 5 or more minutes between flights, at least. Glow plug is about two months old. This engine starts right up every time.

Any guesses?

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06-07-2009 05:26 AM  8 years agoPost 2
duceduc

rrKey Veteran

Saitama-Ken, Japan

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You haven't changed the glow plug it sounds like. Do that. Have you checked the clunk to see nothing is stuck?
If it is still the same, bypass the filter to eliminate the filter.

Duc S
Do It! Do It!™
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RCK:24005615-01

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06-07-2009 01:00 PM  8 years agoPost 3
Steff Giguere

rrProfessor

St-Eustache, Quebec, Canada

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Do you have a fuel filter? Something stuck in it.

Team Synergy, Rail blades, Team Scorpion, V-Team

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06-07-2009 02:14 PM  8 years agoPost 4
JAGNZ

rrProfessor

Auckland, New Zealand

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What gasket material do you use on your Pipe? If it's RTV then it can flake and find its way to the plug element causing issues. Check your Glowplug.


Jason Greenwood

www.3dheli.co.nz

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06-08-2009 01:54 AM  8 years agoPost 5
Simmer

rrElite Veteran

Massachusetts

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Good replies all. The glow plug was changed about one and 1/2 months ago. I did think of this but initially trouble shooting this issue I changed the plug to no avail. Besides, I cannot figure how it would run good then bad the next tank or the third tank.

Clogged clunk, very likely, I will check that. This IS one thing I have not checked. When I initially changed the fule tubing, I found the inside line gummy so it was at the end of its life. I guess about 10 months on the lines. Now I figure at my rate of flying I will change the fuel lines every 8 months or so. So its very possible there is residue in the clunk moving around blocking the flow.

Fule filter is about twe weeks old, a sullivan crap trap. The one I had replaced two weeks ago was the same type and it lasted for about 2 years Almost. I saw the stuff stuck in it when the fuel lines didnt fix it so I thought it was a simple matter of a clogged filter. I can take it out and will have to try this as a last resort.

My guess is the (orig) fuel lines, (orig) fuel lines were at fault but perhaps there is still some stuff fwon the initial contaminante somewhere in the system. Ill pull the tank and clean it out as well as the clunk and recheck the lines.

Here is the timeline.
Consistantly in the middle of the third tank the engine leaned out.
I changed the fuel lines and the issue was still there,(middle of the third tank). Then I changed the fuel filter and High speed needle O-ring, and got three tanks in which ran perfect. Thought I had it licked. Then on two consecutive days I flew one tank each and those ran great. I figured I had it fixed. The next time I flew it, I got to the middle of the second tank and it failed again same way. Leaned out and opening the needle from 1 & 1/4 to 1 & 1/2 and it still ran hot and lean, yet smokes like a son f a gun.

SO maybe I effected it temporarily but not fixed yet. Since I didnt do anything other than replacing the fuel lines in the first place, I did neglect to check the clunk I'll bet and maybe the tank itself has some foreign material in it. Ill give this a go and see what gives.

Thanks All!

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06-08-2009 02:17 AM  8 years agoPost 6
JAGNZ

rrProfessor

Auckland, New Zealand

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Also clean the carb thoroughly as debris might be floating around causing partial blockage.


Jason Greenwood

www.3dheli.co.nz

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06-08-2009 03:59 AM  8 years agoPost 7
Simmer

rrElite Veteran

Massachusetts

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Yea that sounds like a good Idea. Have not actually cleaned a carb before. I suppose, pull the carb and clean it out, (pull the needle valve) flush it or soak the carb in a cup of fuel.

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06-08-2009 06:03 AM  8 years agoPost 8
Dwntyme

rrApprentice

U.S.A.

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just an out of the box question.
what Governor are you using and have you checked this sensor for the Governor?

another thing to look at is the sealing ring at the base of the carb.
and or you may need a Ring and liner...

Love a Twitchy Heli.... :) and Remmington Model 700

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06-08-2009 05:25 PM  8 years agoPost 9
JJheli

rrNovice

Herts UK

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Check the tank
I had a similar problem with my 600 Pro, eventually it turned out to be the tank, the nipple on the top from the exhaust was full of bits of plastic flashing, removed all of the flashing and flushed the tank, no problems at all now.

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06-08-2009 11:47 PM  8 years agoPost 10
Simmer

rrElite Veteran

Massachusetts

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Well to answer a question,I have the GV1 gov. Have the curtis V3 on the shelf but the gv1 works fine. No issues. I run at 2100 (faked out the settings by uping the ratio. If the gov made it run lean?? that would be odd. And understand it happens on the third tank (last time out on the sevond tank) the first one so far has been flawless. It leans out and runs hot, and a full 1/2 turn more than I have ever run it it still runs hot. Has to be a blockage somehwere and with the residue I found in the old filter, My guess now is there is still some restriction in the system, (new lines and all)

Def pulling the tank, checkking the nipple on the exhaust ereturn and the clunk, plus cleaning the engine/carb, checking the o ring on the carb, (this doesnt jive with the fact it runs good for two tanks and then goes lean though)

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11-30-2009 04:58 PM  8 years agoPost 11
Simmer

rrElite Veteran

Massachusetts

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Changed the engine bearings about a month of flying later. Problem solved. 200 plus flights,. I did pretty good with this engine.

Runs like new now, but I bought a 55 last week

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