High exh. temps.

R

Richard Fry

Filing Flight Plan
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Dec 23, 2016
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RFRY1
The mix control cable on my 182 was stuck so I removed it and cleaned it. after reinstalling it to carb. the exh. temp rose to the top of 6probe egt.and stayed there throughout a 2000' climb out.
Returned to airport and checked the mix connection on carb. looked worked great on ground.
Departed again and same problem...
about a week prior to this I had a problem with starting after shut down. flew to lunch, after 1hr. went to leave and the engine would not start. ( 5000'alt. and about 50 dg). pulled mix out and it fired, enriched mix and ran great. after landing tried to start it again and same problem..
An a-p suggested replacing the needle seat float valve..
Not sure what the cause is but sure could use some ideas..
 
I think Norman was also alluding to the general rule that if you do something and something else changes, a good initial assumption is that the cause was your initial action.

That can be a named fallacy, but it happens often enough that it probably should be considered first.
 
Alot of critisism not much help. Says a lot for this Forum !
 
Help? Okay the engine performance is resulting in fuel burning in the exhaust system. Perhaps the mixture is too rich, perhaps there is some other problem. No one here can diagnose the problem remotely. Sorry.
 
Mr Fry:
The "criticism" you speak of are actually knowledgeable folks pointing out that (a) you did something not allowed by the regs (assuming you aren't an A/P), (b) that what you chose to do is a likely culprit for what you are experiencing (directly or indirectly), (c) they recognize that what you did could potentially result in the loss of you, your plane, innocents, or a combination of the three, and finally (d) that there are no "do-overs" in aviation and thus they'd rather potentially hurt your feelings and save your posterior than to live knowing they could have prevented an NTSB report. If you choose to take offense to that, you are in the wrong hobby.

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Now, moving past that. It does sound like you have some sort of carb/fuel/mixture issue. I would say at this point having an A&P look at it would be prudent. The good news is an owner/pilot can pull the cowl, so you shouldn't be forking out a whole lot to get a preliminary diagnosis if it's something apparent in the cable, etc.
 
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How can lubing the mixture cable have anything to do with high EGTs? When it wasn't reinstalled correctly. Other than the small chance for something else to have happened there probably is a change in the mixture arm travel. Your mixture arm should be against the stop with the mixture knob not quite against the panel, right?

By the way, cold air serves to lean your mixture. If you were running on the edge of lean during warm weather you may be excessively lean in cold weather.

Any time a big TCM gets hot EGTs? The first thing to check is the induction rubbers. With all cyls hot and balky starting I'd pay particular attention to the Y pipe connections. Hard to see, easy to overlook. Maybe you bumped one loose while routing that cable.

One other thought. A little bit of water in the float bowl will reduce fuel flow. Before you do anything else you might drain your float bowl and check it for water. I know, you think your strainer is perfect at separating water. It isn't.
 
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Thank you for the help. I appreciate the response.
To those in the previous posts and A/P looked at the cable and carb. and had no idea what was causing the problem.
The mix arm is against the stop and the cable is secure.. The cable was only disconnected at the carb. so there was no rerouting.
I did check the induction system and it is secure. Next step is to drain the bowl for water. I always fly on the rich side of lean..
 
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