0300d oil leaks OIL USAGE

0300d oil leaks OIL USAGE

I HAVE A 1963 172D WITH A 0300D ENGINE I USE OR BURN ABOUT 1 QUART EVERY 4 HOURS. I KNOW PART OF IT IS LEAKING BECAUSE I CAN SEE OIL INSIDE THE COWLING AND DRIPING ON THE GROUND WHEN I LAND. THE QUESTION IS WOULD YOU BE CONERNED ABOUT THE 1 QUART EVERY 4 HOURS AND IDOES ANY ONE HAVE ANY SUG. ON THE OIL LEAKS, I AM FAIRLY SURE PART OF THE LEAK IS COMING FROM THE TUBES BETWEEN THE CYLINDERS.

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Re: 0300d oil leaks OIL USAGE

David,
It will basically depend on how many hours are on the engine,have you had any top end work done lately etc....Ive seen situations that a cylinder was replaced,and the engine was not run with mineral oil for proper break-in.In any instance you might want to try a oil change with Aviation mineral oil in leiu of youre regular oil.Try it for an oil change interval,and see if the consumption decreases.I suspect however that between your leaks and actual consumption youre likely not in bad shape.
Youre leaks are also likely from your push-rod tube seals,or oil tank gasket..if it is indeed the push rod seals there may be a way to curb the leaking....IF these seals are still pliable,you can slide the clamps off them(2ea and it will take a special pair of pliers..regualr ones will bust nuckles)  and rotate the seals,then put the clamps back on.This will alot of times stop the push rod seal leaks BUT it could make it worse also...As always Id suggest you consult a licensed A&P for his opinion.....Tailwinds

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Re: 0300d oil leaks OIL USAGE

I have a 1966 172G with the O-300, and I have the same leaks with about the same usage of oil. Mine has about 1300 hrs on it. I can't offer any suggestions, I'm just in the same boat.

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Re: 0300d oil leaks OIL USAGE

David

I also have a '63 with the 0300, and I had the same oil leaks.  It was coming from the outer end of the pushrod tubes where they come out of the rocker box. The oil runs down the tube until it reaches the rubber connectors, then dripps off and looks like they are leaking, when actually they are not.   All I did was to clean with spray cleaner around where the tubes come out of the rocker box, then apply some silicone sealer all the way around using  my little pinkey....
I am getting around 8 hours per quart.  I live in Michigan and use 40 weight oil most of the time....

                                               Good luck
                                               Steve

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Re: 0300d oil leaks OIL USAGE

The O-300 (C-145) engines pushrod tubes are press-fit into the cylinder heads.  Vibration and incorrect handling can loosen them.  El Reno sells a tool which can be used to tighten that tube for about $40.  The method requires the rockerbox cover and valve rockers and pushrods be removed.  The tool is inserted in the upper end of the tube and  the tool is then turned to re-seat the tube within the cylinder head.  It takes approx 20-30 minutes for each cylinder to do this job.
The oil consumption you describe is normal.  Continental allows 1 qt per hour as a maximum oil consumption.

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Re: 0300d oil leaks OIL USAGE

thanks steve for the info. I have owned my 172 for about two years and i am in the process of  restoring or maby a better choice of words would be bringing it up to todays standards, I have installed a new inst. panell with a garmin 430 GPS 340 audio panel and garmin transponder we also installed a fuel computer that conects to the garmin 430 and gives you really accurate info. When we did the instrument panel we bought burl red oak veneer and glued to the new aluminum panel. I just installed new leather interior which realy looks good with the wood Iguess I will find a mechanic and try your fix for the oil prob. Speed is around 114 MPH ind. at around 4000 ft is that close to your perf. also what kind of fuel burn per hour do you get?  Again thank you for your responce. PS phone no is 940-2401053 that is dallas aera.

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Re: 0300d oil leaks OIL USAGE

Hey David,

I have a O-300-A in my '59 172, and I use about 1 qt. every 10 hours. I am always chasing leaks, if that makes you feel any better...I make a habit of always wiping down the inside of the cowling after every flight. This way, I can detect any new, or significant leaks.

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Re: 0300d oil leaks OIL USAGE

Hi David

Congratulations on an outstanding job on your new panel and interior.  It sounds great...   Regarding the performance figures that you asked about...... I get just about the same 114@4000 that you are getting..   My fuel burn averaged over several hundred hours is 7.8 gph. 
                 
                                       Enjoy,
                                       Steve

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Re: 0300d oil leaks OIL USAGE

Continental O-300's are great leakers! I put a quart of oil in mine about every 8 hrs. and did a lot of wiping!
Glenn

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Re: 0300d oil leaks OIL USAGE

The Continental engine designs include using the pushrod housing tubes for a return oil path to the sump.  They are sometimes neglected in a long-term maintenance program, so the rubbers and upper crimps are neglected and develop leaks.  (This is also a result of the increased valve-train lubrication that Continentals provide, which in turn is an advantage over the insufficient valve train lubrication that Lycomings suffer from.....another reason Lycomings are plagued with so many valve troubles.)

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Re: 0300d oil leaks OIL USAGE

I have a 1967 C172H and it used to leak out the
bottom of the cowling onto the front tire.  About
the same usage as you are stating.

At last annual, had all the valve cover gaskets repleaced.
Real cheap at annual time and no oil leak anymore.

I have around 1400 hours on the 300-D.

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Re: 0300d oil leaks OIL USAGE

We have a 1965 G model Skyhawk with the O-300 that is going through a quart in 4 hours. Took it to my FBO yesterday. He pulled the cowl and noticed that the top of the nose wheel strut was full of oil! Looks like the line (the one that is always in the middle of your oil change) for the oil pressure or temp is leaking.
Might take a closeer look there.
Jim

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Re: 0300d oil leaks OIL USAGE

The capillary for the oil temp gauge on most Continentals is held into the oil screen with a brass nut.  Overtightening this nut ...("Hey! Lookie heeeyer, Rufus!  This thang's hardly tite att-all!  Gimme thet BIG wreanch!")... can result in fracturing the temperature bulb.  Then on the next flight or so, without warning, ALL your oil will pump overboard and out the bottom of the cowling.  First thing you'll notice is your RPM starts to drop.  By the time you figure out that carb-heat is not going to cure the low RPM you will have cooked your main crankshaft bearings and will start to look for a vacant field.
Moral:  Any leaks in this area warrant removing the temp bulb for inspection, and replacement of the temp gauge/capillary/bulb with new.  Don't overtighten.  Just snug, and then 1/8th of a turn.

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Re: 0300d oil leaks OIL USAGE

I have a 1967 H model with the Continental 0300-D and I am getting 13 hours a quart.  I am very pleased with this; but having bought a case of oil I think it will be out of date before I use it!

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Re: 0300d oil leaks OIL USAGE

A couple oft overlooked "leaks" are the Gen/Alt seal ( in the generator
or alternator.

Tach drive seal.

Cylinder base o-rings.These use a rubber compound that hardens & cracks
in a short period of time.  Retorqueing has no effect as these seals are no longer pliable.


Next time your spark plugs are removed get a light & check for a "wet" cylinder.
A cylinder can have good compression & still be an oil pumper.

You may find 1. 2 or even ALL of the pistons are WET.
Once oil gets to that point there is nowhere to go but out the exhaust.

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Re: 0300d oil leaks OIL USAGE

> I am 1 year into co-ownership of a 1967 172H model with a 0300D engine with about 900 hrs on it.We replaced a cylinder last annual because of a stuck exhaust valve.The shop that overhauled the cylinder said that they won,t warrantee the cylinder if we burned mogas.wondering what caused the valve to stick and if the new cylinder will be damaged by burning mogas.fj

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Re: 0300d oil leaks OIL USAGE

Not positive, but I think that the mogas doesnt burn quite as hot or clean, and leaves behind some sticky carbon that sometimes causes the valves to stick.  In the past I've seen owners add Marvel Mystery Oil to the fuel and from then on the planes never had a problem.

Tom
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Re: 0300d oil leaks OIL USAGE

"MOGAS" or unleaded fuel does not have lead in it. The biggest problem that comes thru my shop is valve seat problems. The lead cushions the valve from the seat, without the lead the seat will sometimes beat the valve seat loose. I build 10 to 15 engines a year and I too do not warranty auto gas usage...

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Re: 0300d oil leaks OIL USAGE

IMHO - mogas won't make a difference either way on the valves.  If you follow the threads, more people with small TCM's seem to be sticking valves with 100LL than mogas.  The original TCM valve guides were soft and would wear very quickly.  Oil leakage past the guides caused cokeing to build up on the shaft causing the guides to wear even quicker.  The newer TCM guides would stick a valve easily since they were hardened and there wasn't anywhere for the coking on the valve to go. 
Personally, I think it's time to retire old TCM o-200/300 cylinders (with no disrespect to the overhaul shops)  If the guides aren't put in dead-on-straight you get excessive guide wear with the stock cylinders which can lead to sticking - and most of these cylinders floating around are very old leading to cracks.  I put overhauled cylinders on my airplane and got about 500 hours out of them till they started sucking oil past the valve guides.  After pulling the second jug, off came the overhauled cylinders and on went the ECI's. 
I personally (and for customer's airplanes) have been very happy with ECI's replacement o-200/300 cylinders.  They have a rotocoil on the exhaust valve, more cooling fins and seem to seal up very well.  It's nice to see nearly perfect compressions on these with virtually no oil usage (1 qt every 10 hours for me)
Since the demise of ethanol-free mogas - I run 100LL and lean the crap out of the thing except on climbout.  So far - so good.

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Re: 0300d oil leaks OIL USAGE

Another part of the pushrod seals that will cause leaks is if the clamps/spring that hold them on the tube is not installed correctly.  I have found this twice very recently.  Both leaked oil and both of them did not have the clamps in the groove of the pushrod seals properly.  Check these areas carefully!

Fixed that and the oil leaks stopped (at least from there).  I just flew a 30+ hrs trip and the inside cowling almost looks dry.

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Re: 0300d oil leaks OIL USAGE

David,
I saw your post about updating your airplane with a Garmin 430, Transponder, new radio (?), interior etc.  I have also have a C-172 H model, mostly original equipment. 3000 total hours; 1100 since engine overhaul, so it has more than a few hours left in it, hopefully.  Also, its a straight airplane with no damage or flight training history.
I Was wondering what your investment was in each of your major upgrade projects and your rationale for this investment vs finding a more modern airplane with IFR equipment etc already installed.  I'm going through the due diligence process now and the fork in the road (major upgrade as you have done vs acquisition of a Garmin 696 "uber-handheld," remain VFR and look for an airplane upgrade next year) looms mightily. 
Thanks much for any insight
Steve

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