Yanmar dipstick

[eddystone]

Just curious. Chartered a Jeanneau recently with Yanmar engine. Whenever I removed dipstick to check oil it was completely dry but when re-inserted to check level showed correct level. How do they do that?

 

[awol]

Dinnae ken. But it's an even worse shock the first time when it's your own boat with a brand new engine!

 

[Norman_E]

Which engine. My 4JH series engine always shows oil when I pull the dipstick.

 

[sarabande]

I expect the dipstick is in a tube that goes almost to the bottom of the sump. to prevent the 'blade' flailing around and coming into contact with reciprocating parts.

The dipstick seals the top of the tube and when the engine is running, oil in the bottom of the tube is extracted, leaving the tube empty. When you remove the stick and replace it, the oil in the sump can seep back to indicate the level in the whole sump.

It may be an accidental piece of design, but the two-stage process means you can't misread the stick at a single reading if it has been splashed with oil.

 

[westhinder]

I expect the dipstick is in a tube that goes almost to the bottom of the sump. to prevent the 'blade' flailing around and coming into contact with reciprocating parts.

The dipstick seals the top of the tube and when the engine is running, oil in the bottom of the tube is extracted, leaving the tube empty. When you remove the stick and replace it, the oil in the sump can seep back to indicate the level in the whole sump.

It may be an accidental piece of design, but the two-stage process means you can't misread the stick at a single reading if it has been splashed with oil.

Makes sense.
My 3JH series engine dipstick behaves as described in the OP.

 

[vyv_cox]

Makes sense.
My 3JH series engine dipstick behaves as described in the OP.

And my 3GM.

 

[eddystone]

Ah that explains it

I expect the dipstick is in a tube that goes almost to the bottom of the sump. to prevent the 'blade' flailing around and coming into contact with reciprocating parts.

The dipstick seals the top of the tube and when the engine is running, oil in the bottom of the tube is extracted, leaving the tube empty. When you remove the stick and replace it, the oil in the sump can seep back to indicate the level in the whole sump.

It may be an accidental piece of design, but the two-stage process means you can't misread the stick at a single reading if it has been splashed with oil.

Ah that explains it. Don’t know what model it was 29hp. I only have experience of VP and Beta

 

[DownWest]

29hp sounds like the 3GM30, the 2GM20 doesn't have a sleeve, just the hole in the block.

 

[Irish Rover]

Which engine. My 4JH series engine always shows oil when I pull the dipstick.

+1