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weird bumping (thumping noise) sound from the Jet??? Help

 
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skidmk



Joined: 19 Nov 2007
Posts: 169
Location: Ottawa, Ontario

PostPosted: Mon Sep 10, 2018 8:00 am    Post subject: weird bumping (thumping noise) sound from the Jet??? Help Reply with quote

Folks,

anyone experience this issue?

Low time engine <50 hours. Iron content is up on last oil analysis.

about 10 hours ago, she started giving us an asymmetric bumping sound most prevalent at high power settings, less so at low and idle.

all other parameters are fine, good rpm, temps and pressure all good. NO changes during the bumping

mechanic, removed and ultrasonically cleaned the injectors. Bumping went away for about 2 hours. Yesterday. Bumping is back, and for first time, when i pulled the fuel control to zero for shutdown, there were bumping (thumping?) that were audible . During the cleaning of the injectors, tail was off, and we run it up with zero bumping and nothing visible out of the ordinary.

thoughts??

thanks in advance

Mike "skidmk" Bourget
AcmWarbirds


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Mike "Skidmk" Bourget
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Alekh



Joined: 17 Aug 2013
Posts: 28

PostPosted: Tue Sep 11, 2018 9:23 am    Post subject: Re: weird bumping (thumping noise) sound from the Jet??? He Reply with quote

Is turbine stop time no change/variance from when it was normal?

Andy


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skidmk



Joined: 19 Nov 2007
Posts: 169
Location: Ottawa, Ontario

PostPosted: Wed Sep 12, 2018 10:03 am    Post subject: Re: weird bumping (thumping noise) sound from the Jet??? He Reply with quote

no change or variation in any engine parameters.

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Mike "Skidmk" Bourget
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