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23 Oct 2014, 14:32 [ UTC - 5; DST ]





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 Post subject: Cracked Crankcase Question
PostPosted: 05 Jul 2010, 16:52 
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Company: Tri-City Chrysler Kia
Location: Pinehurst, NC (KSOP)
Aircraft: 1965 Bonanza S35
My family and I just returned from a 2 week trip out west. On our way back I noticed a mist of oil on the windscreen. Not a big deal really, it seems that I've been chasing down one oil leak or another since I bought the plane.

We've replaced push rod tube seals, alternator, front main seal and prop seal. It finally seemed to be fixed, but like I said, on the way back from AZ I noticed a thin film of oil when we were landing in Amarillo.

Anyway, when we landed in Pinehurst on Thursday, my mechanic was there @ the hangar when we taxied up. We were going to take our luggage home and do a quick unpack / repack sorta thing and head out to Ocean Isle Beach to spend the 4th with friends. When we got back to the hangar both cowls were open and the gill plates removed. There were 4 mechanics all looking @ my little Bo. When I asked em wazzup, they informed me that I had a crack on the starboard side crankcase. They showed it to me, almost looked like someone scratched it with a pencil. The next day they removed the alternator and advised me that it runs from the front of the crankcase half back towards one of the main bearing housings. :sad:

They are supposed to have someone look at it and see if it can be repaired or if it needs to be replaced.

So.............

My questions are many....

First, is this a very common problem?
Can it be welded?
If not, can a replacement crankcase half be found economically?
If it can, how many AMU$ am I looking @ here?
At what point do I admit defeat and either do a total rebuild or replace the engine?


I'm sure there are things I've left out. Looking for some soothing sage advice from those of the brotherhood that have "Been there, done that and got the tee shirt"

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dino

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 Post subject: Re: Cracked Crankcase Question
PostPosted: 05 Jul 2010, 16:58 
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Location: Sacramento, CA KLHM
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Dean,
My condolences.. Is it a heavy case or a light case? The heavy case has the bumps along the backbone where the case halves join at the top of the crankcase. Do you have a VAR crank? How much time on the engine since overhaul/new?
I can give you a better idea when those questions are answered..
Tom


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 Post subject: Re: Cracked Crankcase Question
PostPosted: 05 Jul 2010, 17:00 
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Location: Victoria, TX
Aircraft: Bonanza A36
Dean,
Call Bill Cunningham at Powermasters, he will give you sound advice. 918-299-0269
Jerry

PS. I'm sure Tom will also.


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 Post subject: Re: Cracked Crankcase Question
PostPosted: 05 Jul 2010, 17:06 
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My IO520BA developed a crack on the starboard side, too, at about 1200 hours. It was also on a long cross-country. But the crack did not go not all the way though the metal (no oil was escaping). A reputable crankcase shop (Nickson) looked at it and decided that, according to TCM's bulletin on "how to deal with case cracks" it was not weldable. They were talking themselves out of business, so I surrendered and did the BDS IO550 upgrade. That yours is weeping oil suggests to me that a new case, or a new engine if yours has a lot of hours on it, might be in your very near future. Look at it this way: the opportunity to install BDS baffles has been handed to you on a platter.
My sincere condolences,
Robin White


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 Post subject: Re: Cracked Crankcase Question
PostPosted: 05 Jul 2010, 19:29 
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Company: Waypoint Aviation wptmaint.com
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Dino:

Need to know your TSMOH, case type, VAR crank?

I would not repair it (may not be repairable anyway from the sound of it.)

You are AOG for now.

Paul


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 Post subject: Re: Cracked Crankcase Question
PostPosted: 05 Jul 2010, 19:36 
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Location: Tucson, AZ
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Bummer bro.....

Empathetically

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 Post subject: Re: Cracked Crankcase Question
PostPosted: 05 Jul 2010, 19:56 
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Company: Telematic Systems, Inc.
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Username Protected wrote:
Dean,
My condolences.. Is it a heavy case or a light case? The heavy case has the bumps along the backbone where the case halves join at the top of the crankcase. Do you have a VAR crank? How much time on the engine since overhaul/new?
I can give you a better idea when those questions are answered..
Tom


Dean,

We really need this kind of information to give you our best advice! Sorry, been there too! :bud:

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Bill Tassic


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 Post subject: Re: Cracked Crankcase Question
PostPosted: 05 Jul 2010, 20:26 
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Location: Southern Maryland and Fargo,ND
Aircraft: A36TC (1/5th) :)
Sorry to hear that !

Just to be the first: Congratulations to your new Powermasters IO550, you will love it ;)

(Its the same as the 'buy a bonanza, you'll end up in one anyway' that I keep hearing.)


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 Post subject: Re: Cracked Crankcase Question
PostPosted: 05 Jul 2010, 21:03 
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Company: M.B. Kahn Construction Co.
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Aircraft: 2003 Bonanza A36
The first engine in my 79 Bo had a cracked case at 800 hours or so. It was welded and I bought it at 1200 hours. I put another 1400 hours on that engine and it was running perfectly when I replaced it with a factory reman.

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 Post subject: Re: Cracked Crankcase Question
PostPosted: 05 Jul 2010, 21:07 
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Company: Waypoint Aviation wptmaint.com
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Rick: Was it cracked through? (leaking oil)?

I doubt it...but yes, anything can be repaired, just about...if its a light case, all bets are off, though.

VAR or Non-VAR also adds a big x-factor to the discussion.

PMC


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 Post subject: Re: Cracked Crankcase Question
PostPosted: 05 Jul 2010, 21:10 
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How many hours on the rest of the parts? I recall it being around 7amu just to dissasemble and reassemble if nothing was wrong including new bolts and gaskets etc. So, add a case or repair and it sounds like 10 G's then if the engine is to old to spend 10g's on then it 35g But WTFDIK? there's no happy ending :pray:


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 Post subject: Re: Cracked Crankcase Question
PostPosted: 05 Jul 2010, 21:33 
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Location: KMKE Milwaukee, WI
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Username Protected wrote:
The first engine in my 79 Bo had a cracked case at 800 hours or so. It was welded and I bought it at 1200 hours. I put another 1400 hours on that engine and it was running perfectly when I replaced it with a factory reman.


Welding a cast aluminum engine case truly separates the men from the boys.

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 Post subject: Re: Cracked Crankcase Question
PostPosted: 05 Jul 2010, 22:07 
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Company: Tri-City Chrysler Kia
Location: Pinehurst, NC (KSOP)
Aircraft: 1965 Bonanza S35
Thank you all.

Sorry for the incomplete info...

It is a 520BB. I don't know if that's the heavy or the other. :shrug:

I believe the time on the engine is around 900 to 1000 hours. I'm pretty sure it was a re-manufactured engine. I need to look back through the logs, they're @ the office of the company that manages my bo for me ( they were scanning them for me and I haven't picked em back up).

I should have more info in the next few days.

Thanks again all.

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dino

"TRUTH is AUTHORITY..... Authority is not Truth"


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 Post subject: Re: Cracked Crankcase Question
PostPosted: 05 Jul 2010, 22:16 
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Dean,
The key is if you have a VAR crankshaft or not. A VAR crank can be identified by a "V" that is on the flange of the crank next to the serial or part number.
If you don't have the VAR crank, then you must comply with AD97-26-17. That means a new VAR crank. See TCM service bulletin CSB 96-8 attached.
Been there, done that... Lots of AMU's...
Tom


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 Post subject: Re: Cracked Crankcase Question
PostPosted: 05 Jul 2010, 22:19 
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Company: Tri-City Chrysler Kia
Location: Pinehurst, NC (KSOP)
Aircraft: 1965 Bonanza S35
Username Protected wrote:
Dean,
The key is if you have a VAR crankshaft or not. A VAR crank can be identified by a "V" that is on the flange of the crank next to the serial or part number.
If you don't have the VAR crank, then you must comply with AD97-26-17. That means a new VAR crank. See TCM service bulletin CSB 96-8 attached.
Been there, done that... Lots of AMU's...
Tom



Thanks Tom,
I'll ask tomorrow.

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dino

"TRUTH is AUTHORITY..... Authority is not Truth"


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