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M5 restoration project
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Duane
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Location: moultrie ga

PostPosted: Tue Jun 12, 2018 2:32 am    Post subject: Reply with quote

On the oleo oil, If you have the original springs, p/n 4015B, then just some good quality tractor oil. However if you have the newer 4161B springs, then you must use API GL-4 or GL-5 85W-140 gear oil.
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Duane

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Andy Young
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Location: Alaska, Antarctica, Colorado, and Others

PostPosted: Tue Jun 12, 2018 5:00 am    Post subject: Reply with quote

Duane wrote:
On the oleo oil, If you have the original springs, p/n 4015B, then just some good quality tractor oil. However if you have the newer 4161B springs, then you must use API GL-4 or GL-5 85W-140 gear oil.


This is first that I’ve heard this. What is the rational behind needing the different fluid with the new springs?
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Duane
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PostPosted: Tue Jun 12, 2018 7:23 am    Post subject: Reply with quote

It came about by the way we had to do the drop test with the new springs. The thicker oil helps by slowing down the compression and in dampening. Our friendly FAA had changed the way we had to test them over the way it was done originally.
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Duane

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Andy Young
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PostPosted: Tue Jun 12, 2018 8:35 am    Post subject: Reply with quote

Ah. In other words, if one was to inadvertently use the old-spec oil in an airplane that had the new springs, it would function and react more or less like they always had prior to the new testing regime.
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Duane
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PostPosted: Tue Jun 12, 2018 9:32 am    Post subject: Reply with quote

LA LA LA I didn't hear anything. Cool
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Duane

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VA Maule
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PostPosted: Tue Jun 12, 2018 5:48 pm    Post subject: New rules Reply with quote

Now play nice Andy you know they only make new rules to protect us from ourselves Rolling Eyes
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crbnunit
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PostPosted: Wed Jun 13, 2018 10:54 am    Post subject: Reply with quote

The MAN is just trying to keep us down! Laughing
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UP-M5
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Joined: 08 Nov 2006
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Location: AK

PostPosted: Wed Jun 13, 2018 1:13 pm    Post subject: Reply with quote

i have the new 4161B springs with synthetic 85W-140 gear oil and i don't notice any difference in compression or rebound. i do notice that the new springs sit up taller than the 10 year old ones they replaced. and the extended landing gear makes seeing over the cowling an entirely new challenge Smile
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M5-235
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