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oil change question

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henryroden

Joined: 09 Jan 2006
Posts: 13
Location: Albuquerque

Posted: Sun Apr 06, 2014 8:28 am Post subject: oil change question

I just changed the oil at 19 hours from first start. I was going to change it at 20 hours but had the cowl off so went ahead. Drained the tank after burping the engine and replaced the filter. After putting 3.25 qts. back in the tank, which is just a little less than what I drained out, the oil level is above the dipstick hole. Pulled the prop. through 15-20 revolutions and ran the starter for 6-7 seconds, ignition off, no oil pressure and level did not go down. Pressurized the tank, via the oil blow by line, to about 7-8 # with no change. This did not happen when I first filled the tank with oil. What am I doing wrong? Is it safe to start and check the oil pressure within 30 seconds?

jnjrob(at)gmail.com
Guest

Posted: Sun Apr 06, 2014 8:46 am Post subject: oil change question

If your start switch is also the master you have no power to the senders in 

the start mode. Check for pressure just as you release the start mode but 

the switch is still on.

Jim



--

rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Sun Apr 06, 2014 5:52 pm Post subject: oil change question

Krazy, NO! If you truly believe you don't have oil pressure it is definitely NOT safe to start the engine. The 912 does not tolerate no or low oil pressure and long before that 30 seconds is up your engine will be toast. Suggest you pull the top spark plugs from all cylinders and spin the engine by hand until you hear the engine burp. If you cannot get the engine to burp and you still believe the engine has no oil pressure, pull the oil pressure sender and install a mechanical gauge like this: http://www.summitracing.com/parts/sww-82323/overview/ as a test unit. Yeah, it will double the price of your oil change but an extra $40 is cheaper by far than a new engine.

 



Rick Girard



On Sun, Apr 6, 2014 at 12:28 PM,  <pjeffers(at)talktalk.net (pjeffers(at)talktalk.net)> wrote:

 [quote]      You are probably being a little impatient with your expectations of oil pressure in 6 or 7 seconds.

 Are you sure that you did not turn the engine at all, forwards or backwards when your oil tank was empty?

If so you could have got air into the oil system.  The oil pump will not pump air!!! If you did then you will need to bleed the oil system from scratch.  See the Rotax manual for procedure.

 I expect you just did not motor the engine long enough.  Remove one plug from each cylinder and motor for 20 secs or until oil pressure rises.  If you still don&rsquo;t get px then bleed the oil system.

 Regards 

Pete Jeffers



From: Jim Roberts (jnjrob(at)gmail.com)

 Sent: Sunday, 6 April 2014 17:44

To: rotaxengines-list(at)matronics.com (rotaxengines-list(at)matronics.com)



 --> RotaxEngines-List message posted by: "Jim Roberts" <jnjrob(at)gmail.com (jnjrob(at)gmail.com)>



If your start switch is also the master you have no power to the senders in 

 the start mode. Check for pressure just as you release the start mode but 

the switch is still on.

Jim



--

_________________
The smallest miracle right in front of you is enough to make you happy....

BARRY CHECK 6

Joined: 15 Mar 2011
Posts: 738

Posted: Mon Apr 07, 2014 11:46 am Post subject: oil change question

You bought a RatTax



On Sun, Apr 6, 2014 at 12:28 PM, krazydoc33 <galaxyone(at)juno.com (galaxyone(at)juno.com)> wrote:

 [quote]--> RotaxEngines-List message posted by: "krazydoc33" <galaxyone(at)juno.com (galaxyone(at)juno.com)>

  

 I just changed the oil at 19 hours from first start. I was going to change it at 20 hours but had the cowl off so went ahead. Drained the tank after burping the engine and replaced the filter. After putting 3.25 qts. back in the tank, which is just a little less than what I drained out, the oil level is above the dipstick hole. Pulled the prop. through 15-20 revolutions and ran the starter for 6-7 seconds, ignition off, no oil pressure and level did not go down. Pressurized the tank, via the oil blow by line, to about 7-8 # with no change. This did not happen when I first filled the tank with oil. What am I doing wrong? Is it safe to start and check the oil pressure within 30 seconds?

  

 

 

 

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BARRY CHECK 6

Joined: 15 Mar 2011
Posts: 738

Posted: Mon Apr 07, 2014 11:49 am Post subject: oil change question

Sorry Doc,

 But this is the biggest failure on Rotax's part, they did not eliminating a ridiculous problem.  All these engines and all these years and all they could do is offer a complicated solution.  Would deal with a car that had this issue?

 



Barry

 





On Sun, Apr 6, 2014 at 12:28 PM, krazydoc33 <galaxyone(at)juno.com (galaxyone(at)juno.com)> wrote:

 [quote]--> RotaxEngines-List message posted by: "krazydoc33" <galaxyone(at)juno.com (galaxyone(at)juno.com)>

  

 I just changed the oil at 19 hours from first start. I was going to change it at 20 hours but had the cowl off so went ahead. Drained the tank after burping the engine and replaced the filter. After putting 3.25 qts. back in the tank, which is just a little less than what I drained out, the oil level is above the dipstick hole. Pulled the prop. through 15-20 revolutions and ran the starter for 6-7 seconds, ignition off, no oil pressure and level did not go down. Pressurized the tank, via the oil blow by line, to about 7-8 # with no change. This did not happen when I first filled the tank with oil. What am I doing wrong? Is it safe to start and check the oil pressure within 30 seconds?

  

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=421612#421612

 

 

 

 

 

 

 

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 -List" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-List

 ===========

 http://forums.matronics.com

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 le, List Admin.

 ="_blank">http://www.matronics.com/contribution

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 [b]

henryroden

Joined: 09 Jan 2006
Posts: 13
Location: Albuquerque

Posted: Mon Apr 07, 2014 5:57 pm Post subject: Re: oil change question

Hi Jim, The panel is a Dynon skyView, when the master is on so are all the senders. As others have suggested the oil pump needed to be primed. I think what happened is that I left the oil filter off overnight to let it drain down and it also drained the oil pump down too. I purged the system per the Rotax manual and all is now well. I did remove all the top plugs to be able to spin the engine over easier. This engine has always run with a black sooty exhaust pipe. The front two plugs have a black sooty deposit on them but the two rear plugs look fine, a light brown color. Any suggestions?

Thanks.

Henry

jnjrob(at)gmail.com
Guest

Posted: Tue Apr 08, 2014 4:18 am Post subject: oil change question

100LL or car gas?

Jim



--

Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Tue Apr 08, 2014 6:23 am Post subject: Re: oil change question

Hi Henry,



Some of the things you are talking about are normal and there are some tips I can give you. Black dry soot comes from idling and the different intake lengths on the cyl. That goes away during higher rpm running. it isn't a concern.  Give me a call.  I'll be able to put your mind at rest.

_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

henryroden

Joined: 09 Jan 2006
Posts: 13
Location: Albuquerque

Posted: Wed Apr 09, 2014 5:54 am Post subject: Re: oil change question

Hi Jim,

         So far nothing but 91 octane automotive fuel, and all from the same gas station which is right across the road from the air park. Maybe time to try another one?

Roger, I will give you a call or maybe stop by there?

Henry

jnjrob(at)gmail.com
Guest

Posted: Wed Apr 09, 2014 4:42 pm Post subject: oil change question

I have read auto fuel will cause the exhaust pipe to be black.

Jim



--

Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Wed Apr 09, 2014 8:42 pm Post subject: Re: oil change question

If your engine is operating properly neither fuel makes the exhaust black. too much idling and too low an idle rpm might.

_________________
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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