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Model specific boards => Golf mk3 => Topic started by: vwscottie on 06 September 2011, 21:40

Title: Hollow knocking
Post by: vwscottie on 06 September 2011, 21:40

I`m getting what i can best describe is a hollow knocking sound which i only notice when the engines cold. It only happens when i`m pulling away and only last for about a mile or so, Its starting to annoy me now not knowing what it is.   

Title: Re: Hollow knocking
Post by: Screech16v on 06 September 2011, 21:46

Does it relate to wheel speed or engine, roughly what area of the car?

Title: Re: Hollow knocking
Post by: vwscottie on 06 September 2011, 22:18

I`d say it relates to the engine speed and it sounds like its coming from the engine bay 

Title: Re: Hollow knocking
Post by: johnnyvr6 on 06 September 2011, 22:24

knocking normally means the bottom end is on its way out

Title: Re: Hollow knocking
Post by: vwscottie on 06 September 2011, 22:30

I could under stand that if it was knocking all the time or getting worse.It just started suddenly about 3 weeks ago but it isn`t getting any worse

Title: Re: Hollow knocking
Post by: Wayne on 06 September 2011, 23:48

Get the oil pressure checked but it sounds like a big end bearing problem.

Title: Re: Hollow knocking
Post by: trog_nfs on 07 September 2011, 10:00

If there any play in the power steering pump pulley? in my old car i got a knocking sort of noise at idle, and the bearing in the pump had worn and allowing the pulley to move.

Title: Re: Hollow knocking
Post by: AlexMozza on 07 September 2011, 15:45

Drop the sump and have a look :)
That was the sound my Celica made when the big ends went :(

Title: Re: Hollow knocking
Post by: vwscottie on 07 September 2011, 18:29

I almost certian its not the bearing i`ve had some go on me before and it sounded differant to this knocking 

Title: Re: Hollow knocking
Post by: philmar on 07 September 2011, 18:42

 Does it smoke when you first start it? It could be Piston slap or small end bearing wear.

Title: Re: Hollow knocking
Post by: vwscottie on 07 September 2011, 19:17

Quote from: philmar on 07 September 2011, 18:42

Does it smoke when you first start it? It could be Piston slap or small end bearing wear.

I havn`t noticed any smoke on start up but i`ll take note tomorrow when i finish work.

Title: Re: Hollow knocking
Post by: WadGTI on 07 September 2011, 20:13

Thrust bearing?

Title: Re: Hollow knocking
Post by: vwscottie on 07 September 2011, 20:38

 Golfs dont have a thrust bearing
EDIT
Sorry yes they do
If it was the thrust bearing it would rattle all the time 

Title: Re: Hollow knocking
Post by: WadGTI on 07 September 2011, 20:45

Quote from: vwscottie on 07 September 2011, 20:38

Golfs dont have a thrust bearing

?? Mines knocks when you give a good old rev...when you have your foot on the clutch on in gear...the noise disappears. I though this was just the thrust bearing needing changed.

Title: Re: Hollow knocking
Post by: stainesy on 07 September 2011, 20:47

i went to german swedish the other day to get a new thrust bearing when i thought my main oil seal had gone when it hadnt anyway they said the thrust bearing on my car was some plastic thing.

Title: Re: Hollow knocking
Post by: harlemex on 07 September 2011, 22:38

sounds like a sticky tappet to me. Is it a kind of donk donk donk noise? (thats the best way I can think to describe the sound of a sticky tappet.) Stick your head under the bonnet and see if you can locate the noise. If its tappet you will easily here it coming from the top of the engine.  :smiley:

Title: Re: Hollow knocking
Post by: stainesy on 08 September 2011, 18:24

i get that sometimes. easy to fix?

Title: Re: Hollow knocking
Post by: harlemex on 08 September 2011, 20:33

The tricky part is locating the dodgy one(s). Easiest to get a whole new set. Rocker cover off cambelt off then cam bearing caps. Pull out the old and in with new. Make sure they have been immersed in engine oil for a half hour first. Then once in leave the car an hour to let them settle before starting.