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Oil pressure Gauge movement
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Njacko
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Joined: 19 Feb 2014
Posts: 170
Location: SW Scotland, UK

PostPosted: Mon Jun 17, 2019 9:44 am    Post subject: Reply with quote

Just a quick note of thanks and some feedback in case anyone else has the same problem:

The orifice in my (original?) 45 degree angle fitting was about 0.065” diameter.

The flexible hose to the gauge was practically empty (no oil in it).

Brazing and re-drilling the orifice to 0.040” has vastly reduced the gauge needle vibration when the oil is hot (it is steady as a rock when cold). An even smaller hole might have been better, but 1 mm was the smallest drill to hand.

So, success, although the smaller orifice seems like treating the symptom rather than the underlying cause. Does anyone know what causes the pulsating pressure in the oil gallery of a Lycoming engine?
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maules.com
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PostPosted: Mon Jun 17, 2019 9:50 am    Post subject: Reply with quote

I cannot remember the reason but it is a known entity at that particular gallery. A different gallery access will be different. I believe someone at the factory explained it to me long long ago.
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Jeremy
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Maule AK Worldwide
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