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Old 30-05-2023, 15:39   #1
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Boat: Rafiki 37
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ZF25 transmission oil pressurised


Bit of a weird question, I am getting some weird noise under power and trying to figure out what it is.

One thing is that the gearbox oil is 'pressurised', i.e when i unscrew the dipstick there is an audible hiss sound as it depressurises. Considering there is a breather valve on the transmission, I would like to know if this is normal - I don't remember it happening before!

Thanks for any help
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Old 31-05-2023, 12:05   #2
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Re: ZF25 transmission oil pressurised

Some breathers have a ball and spring check valve built in. This can create a bit case pressure. Either way, it has no effect on the operation of the transmission.
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oil, transmission

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