Oil filler cap

[Slootvreter]

Yesterday I checked my car's fluid levels and then I noticed that my oil filler cap is a little loose. It does not leak oil. SHould this cap be airtight? Volvo S40 2.4i

 

[Cameronkk]

I don't think it should be air tight, but it should fit snug. It's only there to stop oil from spilling on your engine, dirt getting in and allowing a way to pour oil into engine.

 

[psion]

Yes it should seal properly and be airtight, to maintain proper crankcase ventilation and stop foreign objects from entering your engine. Moisture for one and dust, etc...

Next time an engine clean gets done, nice water inside to ef up your bearings...

 

[silver6933]

Yes it should be snug. If you remove it while the engine is running, the idle will become uneven.

Check the sealing ring underneath. It may just be worn. They usually come with rebuild kits. The dealer may just have an extra one lying around and give it you for free or a nominal cost.

You need an new L10 cap.

 

[Slootvreter]

Yes it should be snug. If you remove it while the engine is running, the idle will become uneven.

Check the sealing ring underneath. It may just be worn. They usually come with rebuild kits. The dealer may just have an extra one lying around and give it you for free or a nominal cost.

You need an new L10 cap.

Thanks for everyone's responses. THe idling has become a bit rough, for no apparent reason. Until I noticed this loose cap. It does also not have a ring seal, why, I don't know. I'll see if I can find another one.

 

[PsYTraNc3]

What vehicle is it?
Probably good to take into consideration that you get different types of caps with different seals?

Some is the conventional screw on type that seals tightly, others you have to push down before turning (similar to the child proof type bottle caps) and they have some play.

My old car - screw on and was tight
New one - some play in both the oil and fuel cap.

 

[Slootvreter]

What vehicle is it?
Probably good to take into consideration that you get different types of caps with different seals?

Some is the conventional screw on type that seals tightly, others you have to push down before turning (similar to the child proof type bottle caps) and they have some play.

My old car - screw on and was tight
New one - some play in both the oil and fuel cap.

It's a Volvo S40 2.4i. I'm going to phone Volvo, and Volvtech as well to confirm.

 

[Colin62]

It shouldn't cost a fortune to replace the cap. Pick one up from a scrap yard if the agents get all stupid with you.