At my wits end..Cant find the source of a engine noise

[Defends]

Hi guys....I have a 300tdi I have been the carer for 17 years...about 385,000 KMS
Done pretty much all the work on her myself...but this has got me really stumped...hoping someone might have a idea

I have a noise ..hard to explain but sounds like a power steering pump whine/squeal / groan...fairly high pitched...seems to come from drivers side of engine...heres the thing....its ONLY > in 3rd at 80 KPH > and in 4th/ 5th right on 95-100pkh...gets louder the more you try and put your foot down
so far I have
> replaced the brake servo and vaccum pump
> the Fan belt, idle pulley...
> the power steering pump...
> the fuel sender
> Fan centre mount thing ( the metal bit the fan blades go on)
> changed the oil and oil filter
> fuel filter

The noise appears about 3000 -3200 rpm..get louder..if you put your foot down..Im going to swap out the fuel lift pump tomorrow...> I thinking injector pump now???? > anyone had something similar > WHAT WAS IT?

The turbo seems to spin up fine...the rest of the drive train seems fine ( no noises under 80 kph anywhere(
( other than the normal squeaks ect)
oh...I cant seem to make it do it if its in neutral ..only happens if in gear as far as I can tell

Cheers fellas !

[incisor]

can you get a recording of it from different spots in the cab and listen back to them as i found that helped track down where it was coming from

i once chased a noise in one of my defenders that i swore was engine/ancillary and it ended up being transfer case related

sorry cannot help any more than that

best of luck getting to the bottom of it

[Tote]

Hi guys....I have a 300tdi I have been the carer for 17 years...about 385,000 KMS
Done pretty much all the work on her myself...but this has got me really stumped...hoping someone might have a idea

I have a noise ..hard to explain but sounds like a power steering pump whine/squeal / groan...fairly high pitched...seems to come from drivers side of engine...heres the thing....its ONLY > in 3rd at 80 KPH > and in 4th/ 5th right on 95-100pkh...gets louder the more you try and put your foot down
so far I have
> replaced the brake servo and vaccum pump
> the Fan belt, idle pulley...
> the power steering pump...
> the fuel sender
> Fan centre mount thing ( the metal bit the fan blades go on)
> changed the oil and oil filter
> fuel filter

The noise appears about 3000 -3200 rpm..get louder..if you put your foot down..Im going to swap out the fuel lift pump tomorrow...> I thinking injector pump now???? > anyone had something similar > WHAT WAS IT?

The turbo seems to spin up fine...the rest of the drive train seems fine ( no noises under 80 kph anywhere(
( other than the normal squeaks ect)
oh...I cant seem to make it do it if its in neutral ..only happens if in gear as far as I can tell

Cheers fellas !

Leaking turbo hose? I've had one do something similar under load in a Daihatsu Rocky years ago. Leaking just enough to make a noise but only under full boost and under certain conditions.

Regards

Tote

[DiscoMick]

Pulley running dry or off centre, maybe on a belt?
Manifold gasket air leak?
Just wild guesses.

[one_iota]

Firstly welcome!

I've recently had a transfer case failure preceded by a whine above 100km/h 2100rpm now gone with a replacement TC. Worn bearing suspected. The "not in neutral" would point me in a driveline direction particularly given the mileage.