Dip stick seal

[Donkey]

Hi again chaps,

I remember reading somewhere on the Forum about the felt seal on the dip stick.

Now, I haven't got one. How important is it?

I have a late model Mk 2 with excellent oil pressure.

Thanks as always,

Brian

[Goldstar]

http://socforum.com/forum/showthread...-out-old-gauze post number 2 Brian

[Donkey]

http://socforum.com/forum/showthread...-out-old-gauze post number 2 Brian

Thank you, that's where I'd read it.
So, can you explain to a fella with limited technical knowledge what that vacuum does. I have superb oil pressure.

Regards,

Brian

[wilf]

Nowt to do with oil pressure, this is about maintaining a (slight) vacuum inside the crankcase to help deal with blow by gasses.

Some of the inlet manifold vacuum is used to do this via the carbs, and so if you have an air leak you can make the tickover mixture very difficult to fine tune.

So you should have that felt washer to seal the dipstick onto its tube.

The normal check for the crankcase breathing system is that if you take off the oil filler cap while the engine is ticking over, the tickover should slow and stumble (as excess air is let in). If it doesn't, you have an air leak somewhere, and the tickover mixture has been "fudged" to compensate.

[Donkey]

Nowt to do with oil pressure, this is about maintaining a (slight) vacuum inside the crankcase to help deal with blow by gasses.

Some of the inlet manifold vacuum is used to do this via the carbs, and so if you have an air leak you can make the tickover mixture very difficult to fine tune.

So you should have that felt washer to seal the dipstick onto its tube.

The normal check for the crankcase breathing system is that if you take off the oil filler cap while the engine is ticking over, the tickover should slow and stumble (as excess air is let in). If it doesn't, you have an air leak somewhere, and the tickover mixture has been "fudged" to compensate.

Thanks Wilf, I appreciate that.

I'm a rather old trainee mechanic and all this stuff really helps.

Kind regards,

Brian