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pjeffers(at)talktalk.net
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 Posted: Sun Apr 06, 2014 9:36 am Post subject: RotaxEngines-List: oil change question |
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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’t get px then bleed the oil system.
Regards
Pete Jeffers
From: Jim Roberts
Sent: Sunday, 6 April 2014 17:44
To: rotaxengines-list(at)matronics.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
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pjeffers(at)talktalk.net
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| Posted: Mon Apr 07, 2014 12:08 am Post subject: RotaxEngines-List: oil change question |
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Just to clarify what I said, since Richard seems confused, when I said ‘motor’ the engine for 20 secs I did say with the plugs removed, meaning to rotate the engine on the starter motor for 20 secs.
ie DO NOT START the engine, just rotate it on the starter motor for 20 secs.
I am sorry if I confused you.
Pete Jeffers
From: Richard Girard
Sent: Monday, 7 April 2014 02:51
To: rotaxengines-list(at)matronics.com
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> wrote:
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’t get px then bleed the oil system.
Regards
Pete Jeffers
From: Jim Roberts
Sent: Sunday, 6 April 2014 17:44
To: rotaxengines-list(at)matronics.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
--
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Mon Apr 07, 2014 6:35 am Post subject: Re: RotaxEngines-List: oil change question |
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Oil change should be simple. Rotate the prop before you drain oil or remove the filter and never again until the oil is back in the tank and the filter installed. 3 qts. of oil. If you introduce too much air into the system then you will need to do a full Rotax oil purge. There is no need to go there. If you are using Aero Shell Sport Plus 4 then they are liters and just use all 3 liters. This should put you at the top of the dip stick. You can not pre-fill the new Rotax oil filters because of the check valve in the filter. Leave the plugs in place and rotate the prop 20 times +/- it doesn't need to be exact. You must leave the plugs in place because the only way for oil to get back to the oil tank is by crankcase pressure. If you remove the plugs you lose that. Then start the engine and the pressure is usually there within a 1-3 seconds because the system still has oil in it. I would not personally turn the engine over with the ignition off. First it isn't necessary and if done wrong under certain conditions can cause damage.
If you have any questions please don't hesitate to call.
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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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