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SPURPURA
Joined: 04 Apr 2015
Posts: 68
Location: KAPV
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 Posted: Wed Oct 23, 2019 12:54 pm Post subject: 914 head bolt |
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My last flight in N77EU was an aborted takeoff when RPM would not get over
4800. Returning to the hanger and chocking the wheel I got 5100 RPM and smelled oil smoke on shut down so I removed the cowl to find upper right stud
on #2 cylinder had snapped off and was laying on top of the ignition wire so
I’m sure it failed on the ground because it surely would have been lost had it happened in the air.
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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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tennant
Joined: 19 Apr 2011
Posts: 121
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| Posted: Fri Oct 25, 2019 1:35 am Post subject: Re: 914 head bolt |
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Hydrogen Embrittlement?
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Barry Tennant
D-EHBT
At EDLM - Germany |
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peterz(at)zutrasoft.com
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| Posted: Fri Oct 25, 2019 2:12 am Post subject: 914 head bolt |
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wow!
simple over-torque?
On Fri, Oct 25, 2019 at 4:43 AM tennant <barrington.tennant(at)gmail.com (barrington.tennant(at)gmail.com)> wrote:
| Quote: | --> Europa-List message posted by: "tennant" <barrington.tennant(at)gmail.com (barrington.tennant(at)gmail.com)>
Hydrogen Embrittlement?
--------
Barry Tennant
D-EHBT
At EDLM - Germany
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=491962#491962
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SPURPURA
Joined: 04 Apr 2015
Posts: 68
Location: KAPV
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| Posted: Fri Oct 25, 2019 3:57 am Post subject: Re: 914 head bolt |
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750 hours on motor, looks like metal fatigue. The Rotax replacement stud is cad plated metric allthread and is much longer than what is stated in parts catalog.
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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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Matt Dovey
Joined: 13 May 2017
Posts: 48
Location: st albans, england
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| Posted: Fri Oct 25, 2019 7:17 am Post subject: Re: 914 head bolt |
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The replacement looks like something you'd buy from a hardware shop. Its horrible. Sure its a Rotax part?
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SPURPURA
Joined: 04 Apr 2015
Posts: 68
Location: KAPV
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| Posted: Sat Oct 26, 2019 1:08 am Post subject: Re: 914 head bolt |
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Ordered from LEAF, consider them honest, supposed to be Rotax, looks to be hardware store except for the plating on the ends. Perhaps Rotax is having problems with hardened studs failing and new replacements are different.
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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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