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SPURPURA
Joined: 04 Apr 2015
Posts: 73
Location: KAPV
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 Posted: Sun Feb 18, 2018 11:37 am Post subject: Oil pooling |
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On the 914 oil is collecting at the base of #3 and #4 cylinders on the top.
I’ve cleaned the are and found no cracks in the crankcase. Any similar experiences?
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N951EU - Tri-gear & 912ULS, N77EU- Mono & 914
I'D RATHER HAVE A BOTTLE IN FRONT OF ME THAN A FRONTAL LABOTAMY. |
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SPURPURA
Joined: 04 Apr 2015
Posts: 73
Location: KAPV
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| Posted: Fri Feb 23, 2018 2:54 pm Post subject: Re: Oil pooling |
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That leak was located. There was a hairline crack in the crankcase on top near the #3 cylinder approximately 1.25” long. It is not visible to the naked eye but oil bubbles through when pressurized. The crack is about 1/8” below the red Sharpie mark.
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N951EU - Tri-gear & 912ULS, N77EU- Mono & 914
I'D RATHER HAVE A BOTTLE IN FRONT OF ME THAN A FRONTAL LABOTAMY. |
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Ivor
Joined: 23 Jul 2015
Posts: 51
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| Posted: Sat Feb 24, 2018 4:43 pm Post subject: Re: Oil pooling |
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Hi
how did you resolve the crack in the block? total engine strip and weld or
replacement block, just curious!
ivor
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SPURPURA
Joined: 04 Apr 2015
Posts: 73
Location: KAPV
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| Posted: Sun Feb 25, 2018 2:46 am Post subject: Re: Oil pooling |
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JB Weld and patch on it for a 1 hour ferry flight for now.
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_________________
N951EU - Tri-gear & 912ULS, N77EU- Mono & 914
I'D RATHER HAVE A BOTTLE IN FRONT OF ME THAN A FRONTAL LABOTAMY. |
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rampil
Joined: 04 May 2007
Posts: 870
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| Posted: Sun Feb 25, 2018 9:30 am Post subject: Re: Oil pooling |
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I too had a microscopic crack between the cylinders on one half of my case.
Since my engine was 14 years old and < 500 hrs, despite the fact that these cracks are a known casting defect, I was solely responsible for the cost of repair.
The repair required replacing the case with a later design case (no known
casting defects and redesign in affected area) and a mating crankshaft.
Fortunately, I have some friends in the Rotax supply chain and got away
with a bill of ONLY $8000.00 for the engine rebuild(parts and labor).
The only other option was a new engine at a discount price of $17k.
Welding is not an option. The alloy of the case will distort and stress
will lead to more cracks with even expert gentle TIG. This is the uniform
Opinion of several Rotax experts, including one who I know plays loose
and fast with the rules of engine mods.
BTW, once detected, the source of the leak took days to find. The successful
approach involved taping squares of clear plastic kitchen wrap over a dusting
of corn starch on suspicious areas, then running the engine for five min
to pressurize the case interior.
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