Oil Filter?

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Oil Filter?

Postby GlennChong » Sun Jun 07, 2015 12:22 am

The Lycoming VO-540 in my Bell 47G-4 does not have an oil filter.

This seems wrong to me (all of my other aircraft engines have oil filters). Has anybody added an oil filter system to their Bell 47? Any reason I should (or should not) do this?

Glenn
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Re: Oil Filter?

Postby DMaguire » Thu Jun 11, 2015 5:29 pm

The VO-540 delivered in your ship was equipped with an engine oil filter on delivery and the filter is required in order to meet the approved engine configuration. At the bottom of the oil pump housing there is a 1.375 in. hex nut on cover (Lycoming) P/N 71774 with a copper / asbestos gasket, AN900-28. Inside the cover, filter 72785 and washer 70460 complete the filter assembly. The filter is necessary to separate debris and clutch fluff from the oil system and protect internal orifices from blockage. Additional supplemental filter installations have been developed and authorized by STC.
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Re: Oil Filter?

Postby GlennChong » Tue Jun 16, 2015 2:01 pm

My '47 was delivered several years before I was born so I can't comment on how it was configured at that time.

However, at this time there is only a screen, no filter.

Glenn
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Re: Oil Filter?

Postby DMaguire » Wed Jun 17, 2015 12:15 pm

If the screen to which you are referring is located in the lower, RH side of the engine and held in place, in the oil pump assembly, by the hex nut described above, then you likely have the factory configuration. There was no factory-installed paper or organic material replaceable filter installed in Lycoming engines used in the Model 47, only the single metal mesh oil screen which filtered oil common to both the engine and transmission.
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Re: Oil Filter?

Postby Redneck » Sat Apr 22, 2017 9:30 am

Hello,
I owned a hiller "c" for awhile and it used engine oil to lube the transmission, it was my understanding that the Lycoming powered ships did not do this. I didn't like the common oil usage, very poor design in my opinion. Is the bell a separate system?
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Re: Oil Filter?

Postby Bell47H-1 » Tue Apr 25, 2017 7:33 am

Both the Lycoming and Franklin powered Bell 47s use a common oil system for the engine and transmission. Same as your Hiller.
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