Oil Tank Cap

by Rotaxonur in 916iS Technical Questions 6 weeks ago

Hello everyone, I have a question about the original Rotax oil tank. When I examined the oil tank diagram, I saw that there was a vent valve and a vent check valve on the vent line. Is this valve set a new addition, or do the current caps have this feature?

Also, does the oil tank pressurize when the engine is running? If so, how many kPa?

11034_1_AISelect_20250716_151946_Samsung capture.jpg (You do not have access to download this file.)

Re: Oil Tank Cap

by Rotax Wizard » 6 weeks ago

Rotax Wizard

3 1.25k 5.37k

Hi there, good question. The diagram shows some extra things not described in the manual. In the standard oil system, as it comes from Rotax, it is a simple open vent. There is no pressure in the system so it is not a valve at all. The picture in the IM shows an optional vent valve system that can be added for very high altitude operation. In such a case the open vent will cause oil pressure values to be very low. I am aware of some drone producers that do this to allow operations in the 25K plus flight levels.

It is indeed odd that they published this without explanation.

Cheers

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Oil Tank Cap

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