Engine Overheating

Engine Overheating

I just purchased a Cessna 172RG with the Lycoming 180 hp engine.  The engine has been completely overhauled and is running great.  The engine has a tendency, however, to run hot. On a good climb the temperature almost reaches the red line.  I had it checked and the mechanic said it is a characteristic of the RG to run hot coupled with the fact that the engine has is not broke in yet. 

For those of you who have the experience, is this true?  Do 172RGs run hot.  And is there fix, other than the usual.. don't climb for a while, etc.

Glenn Corkins
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Re: Engine Overheating

Review an old post "Best Run-in Oil" and see Walter Atkinsons comments about breaking in engines. 

do a search using the words "Break in" and you will find it or do a subject search.  If you give some further details: For example, what temperatures you are talking about Oil or cylinder head temperature that would also be helpful. What are the temperatures?  How many hours SMOH?  Oil consumption, etc.

I suggest you read information of the many threads and you will get the idea.  Also, I'll bet after some information is given, Walter Atkinson and others will probably provide some very useful advice.

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Re: Engine Overheating

Glenn:

1) The breakin should be COMPLETE by 5 hours.  Period.  If it is not, something is wrong and needs to be addressed.  The last 150 or so engines we've broken in have ALL been finished with the process by about 3.5-4.5 hours.

2) That engine should NOT run hot.  Never let it get above about 380.  Close to the red line is BAD.  There are two basic issues.  Either it's not getting enough FF or the baffles are not proper.  The FF is adequate when the EGT is in the high 1200s or low 1300s on takeoff.

Feel free to call me to discuss the details.

Walter

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Re: Engine Overheating

Hello

I own a 1979 172RG and I'm having having problems with the oil temp getting very close to the red line on hot days, anything above 80F OAT is a problem.

The baffles have just been redone from top to bottom and this situation persists.

please comment at your convenience

Thanks for your time

Felipe Morales

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Re: Engine Overheating

Felipe,

Before you do anything else, have the temp guage calibrated. It's an easy process. We had an 172RG at the school I teach at and it was reading 30 F high.

Rich

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Re: Engine Overheating

Just a thought.... What position are the cowl flaps when the engine gets hot?

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Re: Engine Overheating

Hello,  I have been having the same problem with a 0-235 Lycoming. It is running redline on the oil temperture. Sense it was just overhauled and past the break=in period, I suspect the wrong cam or the cam timing is off a tooth. I read a thread on a web site last year that said there are two cams for your engine, controlable pitch and non controlable, I think you have the wrong one. Check your part numbers.

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Re: Engine Overheating

Usually overheating is caused by bad baffling and or seals. If the engine was just OH, make sure all the baffles are in place, correct and seals are doing their job.
Even new baffles and seals are worthless if installed incorrectly.
IMO

Larry
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Re: Engine Overheating

Something else to consider is whether the overheating is a know problem for your particular Cessna model.  I had an overheating problem with my 1978 C-172N after correcting an out-of-timing issue with the O-320-H2AD engine. Checking and repairing the engine baffles didn't correct the problem.  I then discovered that Cessna had two Service Kits available to correct this problem. 

The first kit adds a lip to the bottom of the cowling to improve air flow through the cowling, and the second kit relocates the oil cooler to the rear baffle for inporved air flow through the cooler. The first was a $100 repair, and it seems to give me adequate cooling for most SoCal days.  The second is a $1200 repair, which I will hold off on unless the overheating becomes a problem again (I don't usually fly on 90+ days because I don't like sweating in airplanes).

Even with the mod, I usually try to maintain at least 80-85 knots on climb for adequate cooling on warm days.  I notice the oil temp will still run a little higher than I'd like if I don't, but will always come back to a comfortable level at cruise.  I was aborting fights on some warm days before the mod because the oil temp would hit red line about 10 minutes after takeoff.  Also, I recently switched from Aeroshell 100W Plus to the 15-W50, and it also seems to help my engine run a little cooler as well.

Hope this helps.

Jon

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Re: Engine Overheating

anyone have any digital pictures of baffling around 0200 in 150,152

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Re: Engine Overheating

Send me an email and I can send you some photos. I just overhauled my O-200 from my C150 and have tons of photos of the baffling off and on the engine.
Reece

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Re: Engine Overheating

Gee-Bee Aeroproducts has all the original patterns for the baffle seals
for C150 thru C421C

We are presently doing all the seals and intake ducts for the  Cessna 300-350-400 Models

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Re: Engine Overheating

I have a C172K w/ 180hp conversion,CS prop. Every since I put on the Power Flow Exhaust system on last Sept. I have had problems with the #3 and some what with the #4, cylinders over heating on climb out. The cylinder head temps reach as high as 430 degrees and EGT 1450 +. Yet the oil temps and press remain normal. We have installed new baffling and enclosed the air around the air filter. I haven't had the C172 long and not entirely sure I didn't have the problem before I installed the tuned exhaust.


I live in the Boise Idaho area which is 2500 feet and it has been customary to lean slightly before takeoff but have quit that and waited until 5000 feet. Once at 5000 feet or higher I try to lean it back to about 9.5 to 10.5 gal/hr and #3 & #4 still heats up. The engine has less then 400 hrs. w/ECI cylinders.


I'm perplexed on what to do and would appreciate any suggestions.

Bob

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Re: Engine Overheating

walter Atkinson Wrote:
-------------------------------------------------------
> Glenn:
>
> 2) That engine should NOT run hot.  Never let it
> get above about 380. 
>
> Feel free to call me to discuss the details.
>
> Walter

Is that 380 referring to oil temp or CHT?  It seems AWFULLY high for oil temp, and quite conservative for CHT.  The CHT in my O360 is usually between 380 and 400, but does get higher than that on a climb in hot weather.

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Re: Engine Overheating

Mr Nixon- I am sure Walter is referring to CHT, as most engine experts like to see CHT's in the 380-390 range on climb out, and never over 400 unless it's unavoidable (eg-terrain avoidance, etc).

JH

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Re: Engine Overheating

172rg's do not run hot, I will also check that the carb heat valve is clossing all the way
Glenn Corkins Wrote:
-------------------------------------------------------
> I just purchased a Cessna 172RG with the Lycoming
> 180 hp engine.  The engine has been completely
> overhauled and is running great.  The engine has a
> tendency, however, to run hot. On a good climb the
> temperature almost reaches the red line.  I had it
> checked and the mechanic said it is a
> characteristic of the RG to run hot coupled with
> the fact that the engine has is not broke in yet.
>
>
> For those of you who have the experience, is this
> true?  Do 172RGs run hot.  And is there fix, other
> than the usual.. don't climb for a while, etc.

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Re: Engine Overheating

Hi i also have oil temp problems the same as most of you say,on climb hot days,my engine has about 240hrs to run,all baffles look secure in position,cowl flaps open on climb and sometimes in flight.Ive check and blown compressed air through the oil cooler looks clear no bugs or obsticles,the factory cooler looks too small and in a bad position at the back cylinder air flow wouldnt be very affective where it is i would like to put a larger oil cooler if possible space is a problem,as well as reposition the cooler towards the front of the engine somewhere airlow might be better any advice would be appreciated.Even when oil temp is hight oil pressure remains constant,i would expect it to drop as it gets hotter,cylinder head temp rises as well but minimum as i have digital cylinder head temp gauge and monitor it at same time.Engine uses minium oil,regular oil change ever 25hrs.Could the cooler be blocked alittle or have residue build up.Should i just buy a new factory cooler just to eliminate that.

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Re: Engine Overheating

Sorry i forgot to mention that i also have a Cessna 172rg 1980 ive had it for 4 years and its always been a worry about running at the top end of the gauge in climb in most seasons temps

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Re: Engine Overheating

I lived with the overheating problem for a while.  Changing the oil every 50-100 hours so as to get rid of any decomposed oil.

I finally isolated the problem.  by adjusting the cowl flaps to stay open with a bigger hole, the temperature finally started to behave as you would expect.  On climb out, it goes up but goes back to mid range after leveling off.  It is as simple as letting more air flow through the engine. Of course, this is after redoing the baffling; rebuilding the oil cooler.  So if you are having over heating problems check the opening of the cowl flaps.

Glenn

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Re: Engine Overheating

Hi after reading and listening to others piolts i took out and replaced the Veratherm which is a temp controled oil flow switch under the oil filter,after putting in in hot water over 100 deg it still didnt retract as it is meant to so i will test my aircraft with the new one fitted as soon as weather permits and get back with results,i did check cowl flaps and all baffles they appear all good so i hope this fixes the problem.

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Re: Engine Overheating

Was anything done to the oil cooler?  Simply flushing it out does nothing.

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Re: Engine Overheating

After taking my aircraft for a test flight after fitting the Vernatherm it appaears to have resolved the oil overheating problem i kept it in climb for a fair time although it did increase a little as expected but nothing like before so anyone with this problem may wish to check that item as well.In the log book it shows it was changed also back in 2000 may be the previous owner had similar problem.

Gary

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