subtle knock from engine????

[finngalway1]

hi all my first time posting!!!!! have a mark 4 gt tdi since nov 98,500 miles on clock... keep hearing noise from back of engine any ideas??? have been told it migth be a gearbow bearing!!!!!

[bonard]

dus it stop when you press the clutch in?

[popin]

Hi Finngalway, as bonard has said. When you hear the noise try pressing the clutch down and see if it goes. I have a GT TDI 150 with an occasional knocking from the gearbox end, but when I depress the cluth it goes quiet. I think it may be the clutch release bearing, but its nothing that concerns me. Maybe someone else may have other ideas?

[bonard]

Hi Finngalway, as bonard has said. When you hear the noise try pressing the clutch down and see if it goes. I have a GT TDI 150 with an occasional knocking from the gearbox end, but when I depress the cluth it goes quiet. I think it may be the clutch release bearing, but its nothing that concerns me. Maybe someone else may have other ideas?

sorry to say mine was the fly wheel ( I think) but but as poppin said I was not worried bout it. the only reason I replaced it was due to my Gbox which came out so I replaced the clutch, fly and bearing as it was on 150k and original and when I got it back the knock had gone..

it was also more noticable when turning the ignition off.

[Pauloz]

Hi Finngalway, as bonard has said. When you hear the noise try pressing the clutch down and see if it goes. I have a GT TDI 150 with an occasional knocking from the gearbox end, but when I depress the cluth it goes quiet. I think it may be the clutch release bearing, but its nothing that concerns me. Maybe someone else may have other ideas?

That sounds more like gearbox bud, or possibly DMF. If the clutch bearings making a noise, it would last approximately 10 minutes before destroying itself

[bonard]

That sounds more like gearbox bud, or possibly DMF. If the clutch bearings making a noise, it would last approximately 10 minutes before destroying itself

With you pointin to the Dual Mass Flywheel is it the springs that get slack/tired inside causing the knocking sound.

[Pauloz]

With you pointin to the Dual Mass Flywheel is it the springs that get slack/tired inside causing the knocking sound.

Almost aye - but the springs are so hard, that its more the tabs on the rotating plate they butt onto which wears, introducing free play, and the knocking. If this continues, eventually it will take the tabs out completely.... at which point you loose drive
Ive only seen this a few times though and becoming less often as garages are finally getting their heads round DMF.

Driving in too high a gear for the road speed is the best way to accelarate wear in this way..... common with taxis!

[finngalway1]

dus it stop when you press the clutch in?

yeah it does.......????

[finngalway1]

That sounds more like gearbox bud, or possibly DMF. If the clutch bearings making a noise, it would last approximately 10 minutes before destroying itself

eh am not too sure about that.. it happened worse when it was very cold one morning... it was a sort of thumping noise have been told to wait untill it gets louder untill i do anything about it????

[finngalway1]

Almost aye - but the springs are so hard, that its more the tabs on the rotating plate they butt onto which wears, introducing free play, and the knocking. If this continues, eventually it will take the tabs out completely.... at which point you loose drive
Ive only seen this a few times though and becoming less often as garages are finally getting their heads round DMF.

Driving in too high a gear for the road speed is the best way to accelarate wear in this way..... common with taxis!

i dunno?? it sometimes feel it loses power v slightly. it was imported from uk