Does anyone's 172 sound like a diesel?

[LOCUST]

Hey as per title really.

Sounds really tappetey on idle it performs fine or seems to as its always sounded like this.

But not ever hearing another ph2 172 I can't tell.

It did spend a week in Renault last year and they didn't say anything ?

 

[DaveDreads]

If it sounds like a diesel it's usually the dephaser pully.

 

[Stava]

Yeah, as Dave says, sounds like a dephaser.

Does it stop once you give it a few revs? Say, anything past 1500rpm?

 

[MartinR]

Could be down to a few things

 

[jonesyblue87]

My 172 was like this but it sounded normal again after a belt and dephaser change.

 

[LOCUST]

Yeah seems to disappear as I rev. I know they sound a little sewing machine like anyway.

I also thought dephaser.
Can someone please explain to me what the dephaser actually does ?

 

[Struggler]

the dephasor pully controls the VVT, will advance the cam timing on the inlet cam slightly at high revs to give valve overlap. which in turn increases power output.

 

[Chapster5]

Would a 1.1 8v have one? I doubt it but mine sounds like a diesel LOL very strange (sorry for the hijack)

 

[Struggler]

nah it wouldnt, i think its only the 2.0L that have them!

on yours it would more likely be the tappets need adjusting!

 

[Chapster5]

I think my mechanic has a new project Thank you Struggler... The Tappety Tappety Tappety on Idle has become very tiresome!