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#1
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Oil in Belly
My 1969 D Model has fresh oil IN the belly in front of the landing gear transmission. No further aft than 1 compartment and no further forward than two compartments. The color of the oil is yellow like. Same as fresh engine oil. I know the transmission has no oil in it. I also know the gear legs have no oil in them. Also the fluid used to actuate the landing gear system is 5606, which is red. I can't find the source and the amount is not very much but enough to pool. Does anyone have any thoughts? Insights? I've cleaned it up before and it comes back. Also it comes out of the weep hole in the belly compartment and streaks back in the airflow on the outside of the airframe.
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#3
03-09-20, 11:06 PM
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#4
03-09-20, 11:41 PM
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metal oil pressure lines from aft, low likelihood of getting pinhole (pretty secure little movement to create a hole but could be possible). It's been a couple months since I looked at mine but see if there are any unions along the route of rear oil pressure line through the tunnel. A union might be better potential site of ooze.
Also, check where metal oil lines join flexible lines behind panel. Hose or union could ooze, travel along line until finds low point and drips into belly. (all this provided you still use mechanical gauges in panel) Likewise look behind rear firewall under engine where the metal line joins the flexible feed line. An ooze at a union here could travel down follow the turn in to the tunnel, and drip off of a low point. (My thinking more likely than above.) I discovered an ooze at flexible-metal line union behind panel just like that a couple months ago. Didn't pool but was making metal line wet/sticky with oil and everything else close to it too. Those flexible lines behind panel out of sight out of mind-can get old, deteriorate, crack or worse. Might be good time to inspect them or replace if old/unknown age. Last edited by wslade2 : 03-09-20 at 11:52 PM.
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#5
03-09-20, 11:51 PM
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The oil pressure lines from the motors are copper lines. They are prone to cracking. Over the years they lose their ductility. There are no unions in those lines until they meet up with the barely flexible lines at the inside of the front firewall behind the gauges.
A good test is to pull the line from the rear motor at the T on the passenger side in the middle of the case. Pressurize that with your nitrogen tank to no more than 50psi. You can T in a tire pressure gauge to that test line too. This will facilitate finding a leak and give you an idea of the accuracy of your oil pressure gauge. In performing this test to repair a leaking oil pressure line in the belly I found that the response of the oil pressure gauge is poor. Below 30psi the needle didn't move. At 50psi it slowly came up. I flushed out the line with solvent but it made no difference. Dave Last edited by DrDave : 03-10-20 at 12:13 AM. Reason: afterthought
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