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JohnF
Joined: 13 May 2010
Posts: 124
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 Posted: Mon Nov 08, 2010 5:49 pm Post subject: VDO Oil Pressure Sender Installation |
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I am installing as VDO remoted oil pressure sender in a 912ULS and wonder if air in the line from the engine over to the firewall-mounted VDO sender is going to be a problem. I suppose I could try to somehow fill that line with oil, but even then inevitably there would be some air. Is this a problem?
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Mon Nov 08, 2010 7:25 pm Post subject: VDO Oil Pressure Sender Installation |
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John, If you can reach the sender easily after it is mounted on the firewall, just leave the line fitting at the sender a turn or so loose and turn the engine over a few times by hand to bleed the air out of the line and then finish tighten the fitting. I've never done it on a Rotax, but the technique works on the remote pressure gauge on my Harley engine.
Rick Girard
On Mon, Nov 8, 2010 at 7:46 PM, John Fasching <n29cx(at)ridgeviewtel.us (n29cx(at)ridgeviewtel.us)> wrote:
| Quote: | I am installing as VDO remoted oil pressure sender in a 912ULS and wonder if air in the line from the engine over to the firewall-mounted VDO sender is going to be a problem. I suppose I could try to somehow fill that line with oil, but even then inevitably there would be some air. Is this a problem?
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Mon Nov 08, 2010 8:18 pm Post subject: Re: VDO Oil Pressure Sender Installation |
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Hi John,
Before you actually finish the job and mount the sender on the firewall, just hold the line up at least to the gearbox level and pour a little oil down the line to fill it. Then screw the sender on the fitting. The very small amount of air, if any, in the line won't make any difference. I have done several of these and have never had an issue this way and you will sleep a little better that night too. 
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