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20 Sep 2017, 03:50 [ UTC - 5; DST ]


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 Post subject: iO520 eating oil
PostPosted: 01 Apr 2013, 00:31 
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Joined: 10/14/11
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Location: Houston , TX
Aircraft: Baron 58
All

I have an IO 520BB that is using about a quart every 2-3 hours now. She has about 1400TT with no top overhaul ever done and is a factory reman from 1987. Lowest compression is 68 with the rest of the cylinders in the 70s. She has flown ROP WOT at 2525RPM her entire life and continues to purr. I just don't know where to start on the oil guzzling

Sean


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 Post subject: Re: iO520 eating oil
PostPosted: 01 Apr 2013, 05:21 
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Location: Brisbane QLD Australia
Aircraft: CE525
Username Protected wrote:
I have an IO 520BB that is using about a quart every 2-3 hours now


Can you give us some idea of how long this has been happening, what is the rate of change etc. be good to understand some trends.

All other engine indications are constant reviewing downloads etc.

Andrew


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 Post subject: Re: iO520 eating oil
PostPosted: 01 Apr 2013, 07:23 
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Location: Staten Island, NY (3N6 airport)
Aircraft: Bonanza K35 (D-5795)
Any visual indication of leaks or anything on the belly?

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The above is not, in any way, to be construed as advice. YMMV! It's worth what you paid for it!


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 Post subject: Re: iO520 eating oil
PostPosted: 01 Apr 2013, 07:37 
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Location: Frederick, MD
Aircraft: V35A TC
what do the plugs look like?

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 Post subject: Re: iO520 eating oil
PostPosted: 01 Apr 2013, 08:19 
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Joined: 04/24/10
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Location: Wilmington, NC
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Hi Sean,
Without more details its hard to say. Are there any signs of oil? Is the belly filthy?
Is there other leaks

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Chris McPherson
Air Wilmington (ILM)
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 Post subject: Re: iO520 eating oil
PostPosted: 01 Apr 2013, 13:18 
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Location: Chicago
Aircraft: Ex PA22, P28R, V35B
The first thing is to figure out where the oil is going. Out the front seal, our the breather, or out the exhaust, or just leaking from a line somewhere (filter tight?). With decent compressions, it doesn't seem as if it's out the exhaust, so there should be liquid oil scattered around somewhere.


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 Post subject: Re: iO520 eating oil
PostPosted: 01 Apr 2013, 14:32 
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Location: Houston , TX
Aircraft: Baron 58
I think it's coming our the breather. Why is this happening ?


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 Post subject: Re: iO520 eating oil
PostPosted: 01 Apr 2013, 14:38 
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Aircraft: Bonanza 36
Hi Rick,

We had the same on out 36 - 1987 factory reman - using a qt every 3 hours - never have any engine/cylinder work and ran like a clock.

I try oil levels from 12 to 6 - no change in oil usage.

I try the crank case pressure test - did not show much.

Plugs were oily - run with fine wire.

Oil would get dark about 5 hours ( to me that was blow by ).

Once we got to 1700+ hours - I decided to go factory new 550 - big mistake - I wish I have just had my 520 overhauled with its cylinders then added TN.

IF I WERE TO GET ANOTHER TCM engine - I would send to PowerMasters and have them work on the valves - or have them rebuild your 520 or convert it to a 550.
(When not if, my factory new cylinders have to come off agin they are going to PowerMasters.)

Best Wishes,
Ken


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 Post subject: Re: iO520 eating oil
PostPosted: 01 Apr 2013, 18:50 
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Location: Buffalo MN KCFE
Aircraft: S35 E35 C120
I know for a fact you can use a quart a hour and have no conclusive sign on the plugs or the exhaust. Rings can anneal from excessive temperatures, give good compression readings, but pass oil like crazy.
With 1700 hrs , one option would be to run it till it gets worse, a quart every 3 is still acceptable to TCM, Or a quick top with deglaze and new rings, or get it overhauled.
I'm assuming it's gotten gradually worse and not leaking.

Greg


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 Post subject: Re: iO520 eating oil
PostPosted: 02 Apr 2013, 09:25 
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Joined: 12/21/07
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Company: ASL CamGuard
Aircraft: C210
Username Protected wrote:
All

I have an IO 520BB that is using about a quart every 2-3 hours now. She has about 1400TT with no top overhaul ever done and is a factory reman from 1987. Lowest compression is 68 with the rest of the cylinders in the 70s. She has flown ROP WOT at 2525RPM her entire life and continues to purr. I just don't know where to start on the oil guzzling

Sean

Sounds like a stuck oil control ring. Lead bromide particles jam the ring so oil consumption goes up even though compressions are fine. Can happen anytime after 1000 ish hours, 500 hours in a Cirrus because of the small sump size.

Ed


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 Post subject: Re: iO520 eating oil
PostPosted: 02 Apr 2013, 09:38 
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Joined: 08/31/09
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Company: Telematic Systems, Inc.
Location: Ft. Myers, FL (KFMY) Willow Run, MI (KYIP)
Aircraft: Baron E55
Another possibility is worn valve guides. Do you have seals on the top of your intake valve guides. As the valve guides wear and tolerances open up you will suck oil through the intake valve guide into the cylinder if you don't have these seals or the seals are shot. AMHIK!

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Bill Tassic


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 Post subject: Re: iO520 eating oil
PostPosted: 02 Apr 2013, 10:16 
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Joined: 01/08/12
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Company: Retired
Location: Buffalo N.Y. 9G0
Aircraft: Baron 58
My IO 520's on my last Baron blew oil out the breathers whenever the oil was higher than 8 quarts, so the solution was to add oil at 7 quarts and maybe an extra for a longer flight. The oil consumption finally stabilized at about one quart per 4 hours on one side and 1 qt per 3 hours on the other. Compressions were all good and it was past mid time. They never were much better than 1 qt per 6-7 from factory reman.


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