Vacuum or over pressure while unscrewing dipstick ZF80A

[Paul]

Went to check transmission fluid level today – Haven’t been out much in the last two months so it’s been a while, but only about 10 engine hours worth of time has passed.

When I unscrewed the dipstick there was either a vacuum sucking, or over pressure blowing (couldn’t tell, I’m at almost full arm length reaching the stick) sound. Both levels were fine. Any idea what’s up? I can’t remember hearing that sound any other time I’ve check the level.

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[Rob Schepis]

Well said, enjoy

[Paul]

Whewwww … thanks

Thanks Rob, that eases my mind. Now onto more fun things to worry about 🙂

[Rob Schepis]

It is normal to be under a slight vacuum. Due to the breather the heat and cool cycle creates a slight vacuum in the case.

[Author]

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