Crankcase ventilation?

[Bonzeau]

One for you techy guys.
I Took Zelda out for a drive yesterday. Upon starting up the revs briefly rose much higher than usual, but quickly settled down to her usual tick over speed. Had a great drive, enjoyed the sunshine, let her warm up thoroughly before giving her some revs, everything seemed normal.
Today I lifted the bonnet to check the coolant level (normal) and oil level. The level shown on the dipstiick was
abnormally high, but after a wipe and another test, it seemed much more like normal (max) which it usually is. I started the engine and removed the oil filler cap. the engine note and revs changed slightly and there was a slight suck when I put my palm over the filler hole, with the engine note changing back as to when the filler cap was on. I then the pulled the dipstick out (engine still running)and there was a gurgling sound coming from the dip stick pipe. Is this normal, or could this be a crankcase breather valve fault?
If so, how does one locate the said valve and pipework and what is the procedure for servicing /replacing them.
Many thanks in anticipation.



Bonzo.

 

[Mazza]

Bentleys info.....

Hope this helps

 

[the Nefyn cat]

Taking the filler cap off while the engine is running should change the engine note, it's a sealed system and letting air into the engine affects it. Longer more technical descriptions are available. But this'll do https://www.youtube.com/watch?v=vODpt5b2DsM
As for changing the valve, this is pretty good.

View: https://www.youtube.com/watch?v=YWXtiCwRH-k

 

[Stevo7682]

Nothing you have said sounds wrong everything that has happened when cap and dipstick out is exactly what should be happening .

 

[t-tony]

You should always let the engine stand for a while before dipping the oil. Remove the dipstick, wipe it clean then, and only then, dip the oil level.

Tony.

ps. Ideally dip the oil before starting from cold as the oil and engine is cold there'll be no expansion to consider and all available oil should be in the sump (apart from what is held in the filter housing).

 

[Sean d]

Its normal

 

[Bonzeau]

You should always let the engine stand for a while before dipping the oil. Remove the dipstick, wipe it clean then, and only then, dip the oil level.

Tony.

ps. Ideally dip the oil before starting from cold as the oil and engine is cold there'll be no expansion to consider and all available oil should be in the sump (apart from what is held in the filter housing).

Hi Tony. I always check the oil level when cold, and apart from this one time the dipstick stem has always been dry down to the max level mark when removing it first time. It just seemed very odd that there was a film of oil on the stem of the dipstick way above the max mark when I checked it this afternoon. So when running, a slight suck from the oil filler opening and a gurgling from the dipstick hole when the dipstick is out is usual? What about the momentary leap in revs when starting yesterday, and again to a lesser degree when starting today? If the crankcase valve was faulty should it trigger the engine warning light?

Sorry to be a bit anal about this, but I do like Zelda to be trouble free.

Many thanks for all your replies.

Bonzo

 

[t-tony]

If it were me I would be checking the rubber intake boots etc. Allan.

Tony.

 

[Bonzeau]

Do you think that could be causing the leap in revs at start up then? She runs perfectly with no flat spots or hesitations. If the intake boots were holed surely these faults would present themselves. I will check them tomorrow, but the last time I looked and had a good feel around they seemed okay.
Allan.

 

[t-tony]

Usually it's an air leak which increases revs mate. The OBC can sort out so much before putting on the malfunction light. Always worth having the codes read as my Z3 had an inlet cam sensor fault which didn't illuminate the EML.

Tony.

 

[Bonzeau]

Thanks Tony. Goodnight mate.