Thread: Discovery 4 TDV6 3.0 Whistle / Whine / Squeal

Sounds to me like significant cam chain rattle in the foreground. The whistle in the background is the turbo spooling up. The rattle would be 1st concern, I think the timing chain guides are worn out, running against the metal backing plate. These engines run a timing belt on the front of the engine from the crank to the outer (exhaust) cam on each bank, then a chain from there to the inner (inlet) cam on each bank. The tensioner sits vertically up between the camshafts, one on each bank, keeping tension on the short chains. When the guide wears out, the chain runs along the backing of the guide, and tension is not what it should be. Risk is if you snap the chains or they jump a tooth or two, valves will hit pistons as they're an interference engine. Relatively easy to replace the tensioners, more costly if they break. The hardest part is getting the manifolds off, as the injectors have to come out, so you need new crush washers for that, and the crossover pipe and throttle Y piece are a fun challenge to get out. 180k km seems a little low for timing chains, but not unheard of

Thanks, it's with Indy at the minute. I will ask him if there is timing chain rattle. Sometimes it's difficult to get what you hear on recording.

Always had the spooling up, but in this there is definitely an addition whistle / squeal beyond what is normal from turbo. Note also the whistle appears to be at rear drivers side of engine, where exhaust manifold / secondary turbo is. But the whistle / squeal is at lower rpms than when the secondary turbo kicks in at 2800 or is 3000 rpms.

I did share this video with the Indy and while yet to talk to the mechanic the guy on Desk says based on the video he believes it is exhaust leak. But will also ask about timing chain. but

For myself really the engine doesn't sound any different to when I bought car 5 years ago.

I can't hear for example the extra metallic noise as in DISCO3.CO.UK - View topic - Discovery 4 ticking noise at idle when hot. which was fixed with replacing lifters

It definitely doesn't sound like that engine should, that's for sure.

Wow that sounds horrible does it happen from cold and get better or after a long hill decent

I just purchased my 2014 TDV6 yesterday...only 108,000km, and this morning when it was stone cold i noticed a whine too. It got better as it warmed up, although not completely gone now that i can hear it it's stuck in my brain. Sound frequency sounds linear with revs...similar to what you'd get from an old school car radio with induced electrical noise.

Is this similar to yours?
Edit: sorry didnt notice the link to the videos...it sounds nothing like yours

Originally Posted by Jason.k

I just purchased my 2014 TDV6 yesterday...only 108,000km, and this morning when it was stone cold i noticed a whine too. It got better as it warmed up, although not completely gone now that i can hear it it's stuck in my brain. Sound frequency sounds linear with revs...similar to what you'd get from an old school car radio with induced electrical noise.

That sounds like the serpentine belt tensioner.

Originally Posted by BradC

That sounds like the serpentine belt tensioner.

Interesting....I guess that would also probably align with the A/C whine I've got - when A/C is switched on the same??? whine is evident (but far louder)

Well, it's an extra significant load on the belt so I wouldn't rule it out.