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hgmckay
Joined: 23 May 2006
Posts: 397
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 Posted: Mon Jul 17, 2017 4:45 am Post subject: Venting (Purging) of the Rotax 912 engine per SI-04-1997 R3 |
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Gentlemen,
I have a question concerning the above SI. On page 3 under section 3) we are instructed to “Disconnect negative terminal of aircraft battery”. Then in section 3.1.1) we are instructed to turn the engine in the normal direction until the “oil pressure rises on the oil pressure gauge”. Since the oil pressure gauge is electrical (connected to the oil pressure sensor by an electrical “wire”) how can the gauge measure or indicate anything if it it not connected electrically (i.e. no battery????)?
Hugh G. McKay III, P.E. Fellow, L.M. ASCE
Senior Consultant
Worldwide Engineering Inc.
4090 North NC Hwy. 16
Denver, NC 28037
Ph. 704-661-8271
Fax 704-483-5466
email hgmckay(at)bellsouth.net
http://www.wwegeo.com
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Thu Jul 20, 2017 5:08 am Post subject: Re: Venting (Purging) of the Rotax 912 engine per SI-04-1997 |
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Hi Hugh,
You don't need to disconnect the battery. Just make sure the key or ignition switches are off. Disconnection of the battery is. CYA issue with Rotax. When I purge an engine I usually see 50-55 psi on the gauge with just St the power on.
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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hgmckay
Joined: 23 May 2006
Posts: 397
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| Posted: Thu Jul 20, 2017 5:59 am Post subject: Re: Venting (Purging) of the Rotax 912 engine per SI-04-1997 |
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Roger, Thanks, but am I correct in stating that if there is no battery connected to the electrical system there will be no pressure indication on the gauge when hand rotating the engine? Hugh
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Thu Jul 20, 2017 2:47 pm Post subject: Re: Venting (Purging) of the Rotax 912 engine per SI-04-1997 |
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For electronic senders you are correct.
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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hgmckay
Joined: 23 May 2006
Posts: 397
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| Posted: Thu Jul 20, 2017 8:15 pm Post subject: Re: Venting (Purging) of the Rotax 912 engine per SI-04-1997 |
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My Rotax 912 UL. has the standard oil pressure sensor wired to a VDO steam gauge. Don't I need the battery connected for the gauge to indicate oil pressure when purging the system? If not please explain why.
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Sat Jul 22, 2017 6:05 am Post subject: Re: Venting (Purging) of the Rotax 912 engine per SI-04-1997 |
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Hi Hugh,
Yes
| | - The Matronics RotaxEngines-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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