Thread: Mystery Knocking Noise from TD5

Oil pump bolt perhaps? Though I would have thought that if that was it it would be all over by now.

Its not something loose or a stuffed engine mount is it?

Mind you if those guys can't find it... I'd be worried to. Give them my regards, just mention July, broken prop-shaft, blue D2, they'll will know who you mean.

Under what conditions is the noise heard - idle, cruising, accelerating, etc? Might it be a loose mounting for an ancilliary, eg PS pump, alternator or a loose wastegate in the turbo, or even loose gearbox bolts or starter motor?

Originally Posted by gone bush

Righto.
disco has developed a Low pitched dull knocking noise on the off side of the engine bay.

So is it a constant knock "in time with the revs" of the crank?
OR is it a constant knock "slower but in time with the revs" of the crank?
OR is it a random knock "Not in time with the revs" of the crank?

Originally Posted by gone bush

They checked fault codes, removed the EGR valve cleaned and tested it, checked engine readings, inspected and cleaned the air filter, checked the air mass sensor, removed and refit the drive belt, inspected the crankshaft pulley and all was OK.

If it is a mechanical knock ....Why didn't they use a stethoscope to isolate the sound??

Originally Posted by gone bush

Has anyone heard of this before?

Big end knock ... Piston knock ... Lifter Knock ... etc + more ???

Originally Posted by gone bush

I am the only bloke getting round with a TD5 Disco that sounds like a ringers ute fitted with a holden 308 with a lumpy cam!

Come on now ... whats wrong with that


Unfortunately ... There are too many items to pick on with such a general description that you have mentioned .... USE A stethoscope to locate & isolate the position of the sound .... IF it is that loud .... It shouldn't be hard to find

Better still ... if it is motor noise .... and its loud on idle ... grab your mobile phone and .... take a movie with sound on it ...... and then up load it to this thread ... cause a picture says a thousand words

Mike

Grab a 3ft length of hose pipe, stick one end in your ear, and the other poke around until you find a louder noise. The hose pipe is particularly good for finding escaping exhaust gas noises. A long bit of broomstick works well for finding mechanical thumping sounds. If the noise does not change with engine load - then I would think it's less likely to be a bottom end $$$ noise. If it's just at idle and decreases with engine revs, then it could be something as simple as a worn drive belt. - Try squirting WD40 on the belts, does that stop the noise?
Is the clutch working the same as it used to? I have heard that the dual mass flywheels on TD5's are a wear items and can disintegrate.

But I agree - A decent mechanic should be able to find this easily.