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Old 12-06-2017, 09:15 AM
jonweisw jonweisw is offline
Join Date: Mar 2005
Posts: 97
Default Oil in weird spot in cabin

Noticed a couple drops of oil underneath the throttle cable where it meets the throttle lever in the cabin. In my RV-8, I have the side panel throttle quadrant mod, but for purposes of this discussion should be considered identical to a stock build.

The other end is connected to a Lyc IO360M1B. The end of the cable is in the vicinity of the low pressure oil return lines, so I decowled to investigate. There was a touch of moistness in that area but nothing more than usual, and certainly nothing obvious that caught my eye. I tightened the hose clamps and buttoned everything up.

Any thoughts? Am I missing something? I checked the other two cables - prop and mixture - and they are completely dry (none of them are in the vicinity of any moistness anyway).

Finally, do any of you replace those short runs of hose from the aluminum return lines to the case?

Here are some pix:




MANY thanks in advance.

Jon Weiswasser
N898JW, RV-8

Last edited by jonweisw : 12-06-2017 at 09:29 AM.
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Old 12-06-2017, 12:20 PM
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airguy airguy is offline
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 4,282

Any chance it could be brake fluid? I had an occasion once where I climbed to high altitude and a bubble in my brake lines burped out the reservoir, spilling a bit on the firewall. A few drops followed the brake line through the firewall where the reservoir penetrates it, and followed the line down to the right side master cylinder, where I observed it and thought I had a leaking master cylinder.
Greg Niehues - VAF 2018 dues paid
Garden City, TX
N16GN flying!
Built an off-plan 9A with too much fuel and too much HP. Should drop dead any minute now.
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Old 12-06-2017, 02:41 PM
jonweisw jonweisw is offline
Join Date: Mar 2005
Posts: 97

nope... pretty clearly motor oil.
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Old 12-07-2017, 04:14 AM
rv8ch rv8ch is offline
Join Date: Feb 2005
Location: LSGG
Posts: 2,332
Default A Prank?

A buddy playing a prank on you? I have "a friend" that used to do this from time to time with various mechanical devices of mine. It was really funny!
Mickey Coggins
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Old 12-07-2017, 06:45 AM
jonweisw jonweisw is offline
Join Date: Mar 2005
Posts: 97

Lol. No prank.
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Old 12-07-2017, 07:04 AM
jliltd jliltd is offline
Join Date: Sep 2013
Location: Rancho San Lorenzo
Posts: 377


I can't tell by looking. Especially on my cell phone. Do you have an electronic oil pressure gauge with remote sender? Or rather does your oil pressure line come through the firewall to the gauge?

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