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914 head bolt

 
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SPURPURA



Joined: 04 Apr 2015
Posts: 66
Location: KAPV

PostPosted: Wed Oct 23, 2019 12:54 pm    Post subject: 914 head bolt Reply with quote

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

PostPosted: Fri Oct 25, 2019 1:35 am    Post subject: Re: 914 head bolt Reply with quote

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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PostPosted: Fri Oct 25, 2019 2:12 am    Post subject: 914 head bolt Reply with quote

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:

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--> 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




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SPURPURA



Joined: 04 Apr 2015
Posts: 66
Location: KAPV

PostPosted: Fri Oct 25, 2019 3:57 am    Post subject: Re: 914 head bolt Reply with quote

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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Matt Dovey



Joined: 13 May 2017
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Location: st albans, england

PostPosted: Fri Oct 25, 2019 7:17 am    Post subject: Re: 914 head bolt Reply with quote

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: 66
Location: KAPV

PostPosted: Sat Oct 26, 2019 1:08 am    Post subject: Re: 914 head bolt Reply with quote

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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